Claude Code System Prompts

This repository contains an up-to-date list of all Claude Code's various system prompts and their associated token counts as of Claude Code v2.1.229 (August 12th, 2026). It also contains a CHANGELOG.md for the system prompts across 255 versions since v2.0.14. From the team behind Piebald.

This repository is updated within minutes of each Claude Code release. See the changelog, and follow @PiebaldAI on X for a summary of the system prompt changes in each release.

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Why multiple "system prompts?"

Claude Code doesn't just have one single string for its system prompt.

Instead, there are:

• Large portions conditionally added depending on the environment and various configs.
• Descriptions for builtin tools like Write, Bash, and TodoWrite, and some are fairly large.
• Separate system prompts for builtin agents like Explore and Plan.
• Numerous AI-powered utility functions, such as conversation compaction, CLAUDE.md generation, session title generation, etc. featuring their own systems prompts.

The result—500+ strings that are constantly changing and moving within a very large minified JS file.

Extraction

This repository contains the system prompts extracted using a script from the latest npm version of Claude Code. As they're extracted directly from Claude Code's compiled source code, they're guaranteed to be exactly what Claude Code uses. If you use tweakcc to customize the system prompts, it works in a similar way—it patches the exact same strings in your local installation as are extracted into this repository.

Prompts

Note that some prompts contain interpolated bits such as builtin tool name references, lists of available sub agents, and various other context-specific variables, so the actual counts in a particular Claude Code session will differ slightly—likely not beyond ±20 tokens, however.

Agent Prompts

Sub-agents and utilities.

Sub-agents

• Agent Prompt: Explore (871 tks) - System prompt for the Explore subagent.
• Agent Prompt: Plan mode (enhanced) (715 tks) - Enhanced prompt for the Plan subagent.

Creation Assistants

• Agent Prompt: CLAUDE.md creation (631 tks) - System prompt for analyzing codebases and creating CLAUDE.md documentation files.
• Agent Prompt: Status line setup (3230 tks) - System prompt for the statusline-setup agent that configures status line display.

Slash Commands

• Agent Prompt: /batch slash command (1106 tks) - Instructions for orchestrating a large, parallelizable change across a codebase.
• Agent Prompt: /code-review inline gap sweep phase (105 tks) - Adds a final same-context sweep for defects missed by an inline code review when subagents are unavailable.
• Agent Prompt: /code-review minimal mode (536 tks) - Minimal /code-review prompt that performs one careful diff pass and reports up to fifteen concrete correctness findings.
• Agent Prompt: /code-review part 1 base finder angles (145 tks) - Line-by-line diff scan instructions for the /code-review slash command's finder-angle phase.
• Agent Prompt: /code-review part 10 ReportFindings output format (345 tks) - Output-format instructions for /code-review runs that report verified findings once through the ReportFindings tool with capped, severity-ranked findings.
• Agent Prompt: /code-review part 2 low effort minimum findings mode (740 tks) - Low-effort /code-review prompt that reads the diff once, targets at least min(files_changed, 4) hunk-visible runtime correctness findings, and performs one extra pass when short.
• Agent Prompt: /code-review part 2 low effort mode (676 tks) - Low-effort /code-review prompt that reads the diff once and returns up to four hunk-visible runtime correctness findings.
• Agent Prompt: /code-review part 3 extra-high and maximum effort modes (510 tks) - Extra-high and maximum-effort /code-review prompt that runs five finder angles, one-vote verification, a gap sweep, and capped JSON findings.
• Agent Prompt: /code-review part 4 three-state verification phase (98 tks) - Verification phase for /code-review that asks one agent verifier to classify each candidate as confirmed, plausible, or refuted.
• Agent Prompt: /code-review part 5 recall-biased verification phase (175 tks) - Recall-biased /code-review verification phase that treats realistic uncertain findings as plausible unless code refutes them.
• Agent Prompt: /code-review part 6 medium effort mode (423 tks) - Medium-effort /code-review prompt that favors precision with three finder angles, one-vote verification, and up to eight JSON findings.
• Agent Prompt: /code-review part 7 high effort mode (468 tks) - High-effort /code-review prompt that favors recall with three finder angles, recall-biased verification, and up to ten JSON findings.
• Agent Prompt: /code-review part 8 GitHub comment posting (152 tks) - Optional /code-review instructions for posting findings as GitHub inline PR comments when --comment is passed.
• Agent Prompt: /code-review part 9 fix application (250 tks) - Optional /code-review instructions for applying findings to the working tree when --fix is passed.
• Agent Prompt: /code-review unavailable-agent inline mode (403 tks) - Builds a single-pass inline code-review prompt that gathers a diff, evaluates configured angles, deduplicates findings, optionally sweeps gaps, and reports capped results when the Agent tool is unavailable.
• Agent Prompt: /code-review workflow routing (743 tks) - Routes eligible /code-review runs through the background code-review workflow and conditionally adds findings reporting, GitHub commenting, fix application, and artifact publishing.
• Agent Prompt: /rename auto-generate session name (80 tks) - Prompt used by /rename (no args) to auto-generate a kebab-case session name from conversation context.
• Agent Prompt: /schedule slash command (4556 tks) - Guides the user through scheduling, updating, listing, or running remote Claude Code agents on cron triggers via the Anthropic cloud API.
• Agent Prompt: /security-review slash command (2521 tks) - Comprehensive security review prompt for analyzing code changes with focus on exploitable vulnerabilities.
• Agent Prompt: /simplify slash command (362 tks) - Instructions for the /simplify slash command that reviews changed code for reuse, simplification, efficiency, and altitude cleanups, then applies the fixes.
• Agent Prompt: /simplify unavailable-agent inline mode (621 tks) - Runs the /simplify cleanup workflow inline across reuse, simplification, efficiency, and altitude angles when the Agent tool is unavailable.
• Agent Prompt: /ultrareview GitHub comment poster (894 tks) - Instructs the /ultrareview posting step to publish exactly one plain GitHub pull request comment from a routine payload, with a run deduplication marker and no other writes.

Utilities

• Agent Prompt: Agent Hook (122 tks) - Prompt for an 'agent hook'.
• Agent Prompt: Artifact comment thread analyst (606 tks) - Instructs a read-only agent to analyze one Artifact comment thread and return a constrained analysis brief for a separate composer.
• Agent Prompt: Auto mode rule reviewer (292 tks) - Reviews and critiques user-defined auto mode classifier rules for clarity, completeness, conflicts, and actionability.
• Agent Prompt: Away summary generation (73 tks) - Prompts a no-tools away-summary generation run to recap the goal, current task, and next action when the user returns.
• Agent Prompt: Background agent state classifier (6237 tks) - Classifies the tail of a background agent transcript as working, blocked, done, or failed and returns concise state JSON.
• Agent Prompt: Background job agent instructions (559 tks) - Instructs the built-in background job agent to narrate progress, restate tool results, and emit explicit result, needs input, or failed status signals.
• Agent Prompt: Bash command description writer (207 tks) - Instructions for generating clear, concise command descriptions in active voice for bash commands.
• Agent Prompt: Claude Code guide (355 tks) - Subagent that answers Claude Code feature/SDK/API questions.
• Agent Prompt: Claude guide agent (2728 tks) - System prompt for the claude-code-guide agent that answers documentation-grounded questions about Claude Code, Claude Agent SDK, Claude API, and Claude Tag.
• Agent Prompt: Coding session title generator (314 tks) - Generates a title for the coding session.
• Agent Prompt: Conversation summarization (1795 tks) - System prompt for creating detailed conversation summaries.
• Agent Prompt: Coordinator worker instructions (830 tks) - Instructions for worker agents executing coordinator-assigned tasks, covering scope control, concurrent branch changes, resumption, failure handling, and coordinator-facing output.
• Agent Prompt: Determine which memory files to attach (354 tks) - Agent for determining which memory files to attach for the main agent.
• Agent Prompt: Dream memory consolidation (1573 tks) - Instructs an agent to perform a multi-phase memory consolidation pass — orienting on existing memories, gathering recent signal from logs and transcripts, merging updates into topic files, and pruning the index.
• Agent Prompt: General purpose agent (63 tks) - Defines a general-purpose agent for researching complex questions, searching code, and executing multi-step tasks.
• Agent Prompt: General purpose (446 tks) - System prompt for the general-purpose subagent that searches, analyzes, and edits code across a codebase while reporting findings concisely to the caller.
• Agent Prompt: General task agent (99 tks) - Instructs a Claude Code task agent to complete the user's request fully and report the essential outcome.
• Agent Prompt: Hook condition evaluator (stop) (319 tks) - System prompt for evaluating hook conditions, specifically stop conditions, in Claude Code.
• Agent Prompt: Hook condition evaluator (88 tks) - Instructs an agent to judge whether a user-provided hook condition is met.
• Agent Prompt: Inherited context for worktree sub-agent (121 tks) - Briefs a sub-agent that it has inherited a parent session's context and is now working in its own isolated git worktree.
• Agent Prompt: Managed Agents onboarding flow (3847 tks) - Interactive interview script that helps users configure a Managed Agent by describing the task, proposing tools and resources, setting up the environment and session, testing access, and emitting integration code.
• Agent Prompt: Onboarding guide draft share link workflow (323 tks) - Adds instructions for sharing the draft ONBOARDING.md before review, then updating the same ShareOnboardingGuide link after the user answers the review questions.
• Agent Prompt: Onboarding guide generator (1135 tks) - Co-authors a team onboarding guide (ONBOARDING.md) for new Claude Code users by analyzing the creator's usage data, classifying session types, and iterating on the draft collaboratively.
• Agent Prompt: PR follow-up cron (172 tks) - Cron prompt for checking a pull request created in the session and fixing failures, comments, or conflicts.
• Agent Prompt: Prompt Suggestion Generator v2 (344 tks) - V2 instructions for generating prompt suggestions for Claude Code.
• Agent Prompt: Pull request creation (1176 tks) - Prompt for creating a single GitHub pull request from existing commits with branch, template, attribution, shell-formatting, and git-safety guidance.
• Agent Prompt: Quick PR creation (1641 tks) - Streamlined prompt for creating a commit and pull request with pre-populated context.
• Agent Prompt: Quick git commit (1338 tks) - Streamlined prompt for creating a single git commit with pre-populated context.
• Agent Prompt: Read-only search agent (93 tks) - Defines a read-only search agent for broad fan-out code searches that returns conclusions instead of file dumps.
• Agent Prompt: Recent Message Summarization (1272 tks) - Agent prompt used for summarizing recent messages.
• Agent Prompt: Schedule action selection (114 tks) - Instructs the cloud scheduling agent to ask the user which schedule action to perform first.
• Agent Prompt: Security monitor for autonomous agent actions (first part) (12085 tks) - Instructs Claude to act as a security monitor that evaluates autonomous coding agent actions against block/allow rules to prevent prompt injection, scope creep, and accidental damage.
• Agent Prompt: Security monitor for autonomous agent actions (second part) (25099 tks) - Defines the environment context, block rules, and allow exceptions that govern which tool actions the agent may or may not perform.
• Agent Prompt: Session title and branch generation (307 tks) - Agent for generating succinct session titles and git branch names.
• Agent Prompt: Session transcript chunk summary (89 tks) - Instructs an agent to summarize a chunk of a Claude Code session transcript concisely.
• Agent Prompt: Summarization no-tools guard (107 tks) - Shared prefix for compaction summarization agents that forbids tool use and requires plain text analysis and summary blocks.
• Agent Prompt: WebFetch summarizer (189 tks) - Prompt for agent that summarizes verbose output from WebFetch for the main model.
• Agent Prompt: Worker fork (268 tks) - Directive injected into a forked child agent, telling it to treat the inherited transcript as reference, execute one directive directly, and report once.
• Agent Prompt: Workflow script plain text return note (76 tks) - Appended note telling a workflow script agent that its final text response is parsed as the script return value.
• Agent Prompt: Workflow script structured return note (120 tks) - Appended note telling a workflow script agent to return its final answer by calling the structured output tool exactly once.
• Agent Prompt: Workflow subagent plain text output (154 tks) - Instructs an internal workflow subagent to return its final text verbatim as the calling workflow script's parsed result.
• Agent Prompt: Workflow subagent structured output (190 tks) - Instructs an internal workflow subagent to return its final answer by calling the StructuredOutput tool exactly once with schema-valid input.

Data

The content of various template files embedded in Claude Code.

• Data: /auto-mode-setup usage (406 tks) - Defines /auto-mode-setup proposal and reviewed-apply command syntax, request ID ordering, save-target validation, and integrity requirements.
• Data: Anthropic CLI (4615 tks) - Reference documentation for the ant CLI covering installation, authentication, command structure, input and output shaping, managed agents workflows, and scripting patterns.
• Data: Artifact MCP connector guidance (604 tks) - Explains how Artifact MCP manifests identify claude.ai connectors and discover upstream tool names.
• Data: Artifact connector call observation requirement (199 tks) - Requires observing a connector tool request and response before publishing an Artifact that calls it.
• Data: Artifact runtime capability declarations (271 tks) - Defines Artifact runtime capability declaration, carry-forward, clearing, replacement, and contract pinning semantics.
• Data: Auto-compact inputs changed event schema (221 tks) - Schema description for worker-resolved auto-compaction state events used by thin clients to display the effective compaction countdown.
• Data: Background tasks changed event schema (237 tks) - Schema description for the background_tasks_changed system event and its replace-set semantics.
• Data: Claude API reference — C# (7997 tks) - C# SDK reference including installation, client initialization, basic requests, streaming, and tool use.
• Data: Claude API reference — Go (3542 tks) - Go SDK reference.
• Data: Claude API reference — Java (4844 tks) - Java SDK reference including installation, client initialization, basic requests, streaming, and beta tool use.
• Data: Claude API reference — PHP (2648 tks) - PHP SDK reference.
• Data: Claude API reference — Python (7423 tks) - Python SDK reference including installation, client initialization, basic requests, thinking, and multi-turn conversation.
• Data: Claude API reference — Ruby (1947 tks) - Ruby SDK reference including installation, client initialization, basic requests, streaming, and beta tool runner.
• Data: Claude API reference — TypeScript (5854 tks) - TypeScript SDK reference including installation, client initialization, basic requests, thinking, and multi-turn conversation.
• Data: Claude API reference — cURL (3959 tks) - Raw API reference for Claude API for use with cURL or else Raw HTTP.
• Data: Claude Code agent proxy troubleshooting guide (2030 tks) - Troubleshooting guide for Claude Code's policy-enforcing HTTPS agent proxy, covering TLS trust setup, status checks, git, docker, and unsupported traffic.
• Data: Claude Code gateway customer-routed inference protocol (2810 tks) - Conditional extension to the Claude Code gateway protocol defining customer-routed inference authentication, forwarding, response hygiene, error recovery, policy blocking, discovery, and endpoint requirements.
• Data: Claude Code gateway protocol (5180 tks) - Markdown reference documenting the Claude Code gateway wire contract, including OAuth 2.0 device flow, RFC 8414 discovery, Messages API inference, managed settings, model discovery, OTLP telemetry, error envelopes, TLS certificate pinning, and proxying to Bedrock, Vertex, and Foundry.
• Data: Claude Code live documentation sources (2378 tks) - WebFetch URLs for fetching current Claude Code documentation from official sources.
• Data: Claude Code recent changes reference (1563 tks) - Reference mapping of recently removed or renamed Claude Code commands, flags, and terms to their current replacements.
• Data: Claude Platform on AWS reference (1608 tks) - Reference documentation for using the Claude Developer Platform through AWS infrastructure, including AnthropicAWS clients, required region and workspace configuration, SigV4 authentication, and short-term API keys.
• Data: Claude Tag (Claude in Slack) reference (1996 tks) - Offline reference for Claude Tag, Claude Code's org-managed Slack surface, covering what it is, availability, setup, configuration, and how it differs from the earlier Claude in Slack app.
• Data: Claude gateway landing page (392 tks) - HTML status page served at a Claude Code gateway root, showing the gateway logo, the running gateway URL, the identity-provider host, an OAuth discovery link, and the gateway version.
• Data: Claude model catalog (4965 tks) - Catalog of current and legacy Claude models with exact model IDs, aliases, context windows, and pricing.
• Data: Code change published event schema (349 tks) - Schema description for the code_change_published system event, including provenance, idempotency, trust boundaries, and best-effort delivery.
• Data: Command plugin source command field (160 tks) - Describes the command field for command-based plugin sources, including its one-line directory output contract, cache-copy lifecycle, platform shell, and re-resolution behavior.
• Data: Cowork plugin MCP discovery and connection (1338 tks) - Reference guidance for finding MCP connectors during plugin customization, using search and suggestion tools, mapping categories to keywords, and writing .mcp.json entries.
• Data: Cowork plugin component schemas (3109 tks) - Reference documentation for Cowork plugin component formats, including skills, agents, hooks, MCP servers, legacy commands, CONNECTORS.md, and README.md.
• Data: Cowork plugin examples (2323 tks) - Reference examples of minimal, medium, and complex Cowork plugin structures with plugin metadata, skills, agents, hooks, MCP config, README, and connectors.
• Data: Cross-session inbound setting (175 tks) - Describes crossSessionInbound delivery, hold, refusal, and permission-mode parity behavior for peer messages.
• Data: Data visualization anti-patterns (2317 tks) - Reference list of chart and dashboard anti-patterns to check against before shipping a data visualization.
• Data: Data visualization choosing a form (1174 tks) - Reference guidance for choosing the appropriate chart, stat tile, or non-chart form based on the data's job.
• Data: Data visualization components (836 tks) - Reference specification for the HTML/SVG pieces, layers, and system parameters that make up a data visualization.
• Data: Data visualization interaction (1318 tks) - Reference guidance for chart hover layers, tooltips, filters, linked highlighting, and interaction behavior.
• Data: Data visualization marks and anatomy (2164 tks) - Reference specifications for chart marks, spacing, labels, axes, legends, and stat-tile anatomy.
• Data: Data visualization reference palette (3749 tks) - Reference palette instance for the data visualization method, including ramps, categorical order, status colors, surfaces, and typography.
• Data: Dialog expiry setting (204 tks) - Describes dialogExpiry deadlines for remote permission dialogs and held cross-session messages, including defaults and overrides.
• Data: DirectoryAdded hook description (216 tks) - Describes when the DirectoryAdded hook fires, its input fields, and how failures and output are handled for add-dir and register_repo_root sources.
• Data: Files API reference — Go (336 tks) - Go Files API reference including file upload, listing, deletion, and usage in messages.
• Data: Files API reference — Python (1360 tks) - Python Files API reference including file upload, listing, deletion, and usage in messages.
• Data: Files API reference — TypeScript (797 tks) - TypeScript Files API reference including file upload, listing, deletion, and usage in messages.
• Data: Gateway device code entry page (228 tks) - HTML verification page served at a gateway device endpoint, prompting the user to enter the short device code shown by Claude Code so they can sign in through their company identity provider.
• Data: GitHub Actions workflow for @claude mentions (525 tks) - GitHub Actions workflow template for triggering Claude Code via @claude mentions.
• Data: GitHub App installation PR description (409 tks) - Template for PR description when installing Claude Code GitHub App integration.
• Data: Governed GitHub CLI shim header (292 tks) - Header comments for the per-session governed GitHub CLI shim that routes github.com gh traffic through the agent proxy while preserving customer-token and GitHub Enterprise traffic.
• Data: Governed GitHub CLI shim routing (691 tks) - Shell routing logic for the governed gh shim, including GitHub host detection, real gh fallback execution, agent proxy settings, CA bundle configuration, and proxy-injected tokens.
• Data: HTTP error codes reference (4809 tks) - Reference for HTTP error codes returned by the Claude API with common causes and handling strategies.
• Data: Interrupt cancel queued parameter (507 tks) - Schema description for the optional interrupt cancel_queued request parameter and its queued-command cancellation semantics.
• Data: Interrupt receipt cancelled field (291 tks) - Schema description for the cancelled UUID list returned when an interrupt request cancels queued commands.
• Data: Interrupt receipt still queued field (542 tks) - Schema description for the still_queued UUID list returned by interrupt control responses.
• Data: Knowledge MCP search strategies (447 tks) - Reference query patterns for using knowledge MCPs to discover organization-specific tool names, project identifiers, team names, and workflow details during plugin customization.
• Data: Live documentation sources (6222 tks) - WebFetch URLs for fetching current Claude API and Agent SDK documentation from official sources.
• Data: MCP HTTP client capability validation rationale (189 tks) - Explains where required client capabilities are validated in the modern MCP HTTP request ladder and how the pre-dispatch gate affects observable precedence.
• Data: MCP HTTP parameter header validation rationale (247 tks) - Explains validation of Mcp-Param headers against tool declarations and request arguments, including error shape and pre-dispatch precedence.
• Data: MCP HTTP standard header validation rationale (326 tks) - Explains the modern MCP HTTP validation ladder's Mcp-Method and Mcp-Name header checks and their observed pre-dispatch precedence.
• Data: Managed Agents Scheduled Deployments (3285 tks) - Managed Agents scheduled deployment API guidance, including cron schedules, deployment runs, pausing, resuming, and operational limits.
• Data: Managed Agents Webhooks (4064 tks) - Managed Agents webhook guidance for registering endpoints, verifying HMAC signatures, handling event payloads, and processing retries.
• Data: Managed Agents client patterns (3926 tks) - Reference guide of common client-side patterns for driving Managed Agent sessions, including stream reconnection, idle-break gating, tool confirmations, interrupts, and custom tools.
• Data: Managed Agents core concepts (10959 tks) - Reference documentation for the Managed Agents API covering core concepts (Agents, Sessions, Environments, Containers), lifecycle, versioning, endpoints, and usage patterns.
• Data: Managed Agents endpoint reference (12697 tks) - Comprehensive reference for Managed Agents API endpoints, SDK methods, request/response schemas, error handling, and rate limits.
• Data: Managed Agents environments and resources (4414 tks) - Reference documentation covering Managed Agents environments, file resources, GitHub repository mounting, and the Files API with SDK examples.
• Data: Managed Agents events and steering (8052 tks) - Reference guide for sending and receiving events on managed agent sessions, including streaming, polling, reconnection, message queuing, interrupts, and event payload details.
• Data: Managed Agents memory stores reference (3746 tks) - Reference documentation for managed agents memory stores, memory versions, attachment, and direct memory management.
• Data: Managed Agents multiagent sessions (8718 tks) - Reference documentation for Managed Agents multiagent sessions, including coordinator rosters, threads, session stream events, subagent tool permissions, and pitfalls.
• Data: Managed Agents outcomes (2771 tks) - Reference documentation for Managed Agents outcomes, including user.define_outcome events, rubrics, outcome evaluation events, deliverables, and interaction rules.
• Data: Managed Agents overview (4616 tks) - Provides the agent with a comprehensive overview of the Managed Agents API architecture, mandatory agent-then-session flow, beta headers, documentation reading guide, and common pitfalls.
• Data: Managed Agents reference — Go (8273 tks) - Reference guide for using the Anthropic Go SDK to create and manage agents, environments, sessions, and tools.
• Data: Managed Agents reference — Java (6740 tks) - Reference guide for using the Anthropic Java SDK to create and manage agents, environments, and sessions.
• Data: Managed Agents reference — PHP (5420 tks) - Reference guide for using the Anthropic PHP SDK to create and manage agents, environments, and sessions.
• Data: Managed Agents reference — Python (3732 tks) - Reference guide for using the Anthropic Python SDK to create and manage agents, sessions, environments, streaming, custom tools, files, and MCP servers.
• Data: Managed Agents reference — Ruby (4202 tks) - Reference guide for using the Anthropic Ruby SDK to create and manage agents, environments, and sessions.
• Data: Managed Agents reference — TypeScript (3719 tks) - Reference guide for using the Anthropic TypeScript SDK to create and manage agents, sessions, environments, streaming, custom tools, file uploads, and MCP server integration.
• Data: Managed Agents reference — cURL (3965 tks) - Provides cURL and raw HTTP request examples for the Managed Agents API including environment, agent, and session lifecycle operations.
• Data: Managed Agents self-hosted sandboxes (2930 tks) - Reference documentation for running Managed Agents tool execution in self-hosted infrastructure, including environment setup, workers, webhook-driven wake, orchestration, monitoring, credentials, and security responsibilities.
• Data: Managed Agents tools and skills (8360 tks) - Reference documentation covering the Managed Agents SDK's tool types (agent toolset, MCP, custom), permission policies, vault credential management, and skills API for building specialized agents.
• Data: Message Batches API reference — Python (1635 tks) - Python Batches API reference including batch creation, status polling, and result retrieval at 50% cost.
• Data: Message Batches API — TypeScript (805 tks) - TypeScript usage guide for Claude's asynchronous Message Batches endpoint.
• Data: Peer sender display name field (199 tks) - Schema description for the normalized display name on cross-session peer message senders.
• Data: Plan artifact HTML template (19044 tks) - Standalone HTML template used for published plan artifacts, including layout, fill contract, and light/dark styling.
• Data: Platform availability (2918 tks) - Feature availability matrix across Claude API provider platforms (first-party, Claude Platform on AWS, Bedrock, Vertex, and Foundry).
• Data: Prompt Caching — Design & Optimization (6056 tks) - Document on how to design prompt-building code for effective caching, including placement patterns and anti-patterns.
• Data: Rewind files skippedLinks field (198 tks) - Describes the rewindFiles skippedLinks count, including link-safety refusal semantics and dry-run behavior.
• Data: SDK protocol capabilities field (319 tks) - Schema description for the optional system init capabilities list used by SDK consumers to feature-detect interrupt handling, queued cancellation, and queued-notification delivery.
• Data: SDK query result modelUsage field (216 tks) - Schema description for the cumulative modelUsage field on SDK query results, including per-model accounting, streaming-session lifecycle, excluded helper calls, and estimate caveats.
• Data: Sandbox TLS termination setting (199 tks) - Describes the experimental sandbox.network.tlsTerminate setting, certificate behavior, Windows trust requirements, source precedence, and initialization validation.
• Data: Sandbox credential environment no-match setting (188 tks) - Describes sandbox credential environment-variable onExtractNoMatch behavior, including warn, deny, error, and decode-path constraints.
• Data: Sandbox credential file mask claims setting (179 tks) - Describes sandbox credential file maskClaims behavior for selectively masking decoded JWT payload claims while preserving other claims.
• Data: Sandbox credential mask empty injectHosts warning (174 tks) - Warns that sandbox credential masks with empty injectHosts expose only sentinel values and explains how to resolve adapter, managed-settings, and local configuration causes.
• Data: Sandbox filesystem disabled setting (227 tks) - Describes sandbox.filesystem.disabled behavior, platform limits, read-protection effects, and configuration precedence.
• Data: Sandbox network domain spelling warning (278 tks) - Formats the sandbox diagnostic for unreliable network domain spellings and explains conservative enforcement until entries are corrected.
• Data: Self-hosted runner command help (4092 tks) - Documents self-hosted runner connection, runtime, lifecycle, watchdog, security, health, and debug command-line options.
• Data: Self-hosted runner decode-token command help (869 tks) - Documents self-hosted runner token decoding, redaction, validation, input, and output command-line options.
• Data: Self-hosted runner orchestrator command help (1390 tks) - Documents self-hosted runner orchestrator connection, hook, SCM connector, runtime, health, and debug command-line options.
• Data: Self-hosted runner session metrics help (594 tks) - Defines Prometheus HELP text for self-hosted runner session lifecycle counters.
• Data: Streaming reference — C# (378 tks) - C# streaming reference including streaming events and the RawMessageStreamEvent TryPick methods.
• Data: Streaming reference — PHP (315 tks) - PHP streaming reference including streaming events and handling content block deltas (requires SDK v0.5.0+).
• Data: Streaming reference — Python (2381 tks) - Python streaming reference including sync/async streaming and handling different content types.
• Data: Streaming reference — TypeScript (2223 tks) - TypeScript streaming reference including basic streaming and handling different content types.
• Data: Thin-client diff dialog schema (198 tks) - Internal data description for workspace git diff payloads used by the thin-client diff dialog.
• Data: Token counting reference (486 tks) - Reference documentation for counting Claude model tokens with the Messages count_tokens endpoint and Anthropic SDK or CLI examples, including warnings against OpenAI tokenizers.
• Data: Tool use concepts (12445 tks) - Conceptual foundations of tool use with the Claude API including tool definitions, tool choice, and best practices.
• Data: Tool use display metadata field (172 tks) - Documents the tool_use_meta wire field carrying per-block display metadata for a message's tool_use blocks; it is wrapper-level UI metadata and is not replayed to the model.
• Data: Tool use reference — C# (2402 tks) - C# tool use reference including defining tools and reconstructing response content for the follow-up assistant message.
• Data: Tool use reference — Go (3468 tks) - Go tool use reference including the beta tool runner with automatic schema generation and the manual agentic loop.
• Data: Tool use reference — Java (3903 tks) - Java tool use reference including defining tools and the manual agentic loop.
• Data: Tool use reference — PHP (3211 tks) - PHP tool use reference including the beta tool runner and the manual agentic loop with camelCase keys.
• Data: Tool use reference — Python (7076 tks) - Python tool use reference including tool runner, manual agentic loop, code execution, and structured outputs.
• Data: Tool use reference — TypeScript (7559 tks) - TypeScript tool use reference including tool runner, manual agentic loop, code execution, and structured outputs.
• Data: VCS state changed event schema (251 tks) - Schema description for the vcs_state_changed system event as a best-effort repository cache-invalidation signal.
• Data: Workshop artifact HTML template (47750 tks) - Standalone HTML template used for published workshop artifacts, including decision rendering, fill contract, interaction controls, and light/dark styling.

System Prompt

Parts of the main system prompt.

• System Prompt: /loop tick (loop.md absent, dynamic pacing) (177 tks) - Loop tick injection for dynamic self-paced autonomous checks when loop.md is absent.
• System Prompt: /loop tick (loop.md tasks) (94 tks) - Loop tick injection for recurring cron-based runs of tasks from loop.md.
• System Prompt: /loop tick (loop.md tasks, dynamic pacing) (174 tks) - Loop tick injection for dynamic self-paced runs of tasks from loop.md.
• System Prompt: Act when ready (68 tks) - Instructs the agent to act once it has enough information and give recommendations instead of exhaustive surveys.
• System Prompt: Action safety and truthful reporting (233 tks) - Requires confirmation for irreversible or outward-facing actions, checking targets before destructive edits, and truthful reporting of outcomes.
• System Prompt: Advisor tool instructions (443 tks) - Instructions for using the Advisor tool.
• System Prompt: Agent Summary Generation (178 tks) - System prompt used for "Agent Summary" generation.
• System Prompt: Agent thread notes (293 tks) - Behavioral guidelines for agent threads covering absolute paths, response formatting, emoji avoidance, and tool call punctuation.
• System Prompt: Artifact comment decision reformat retry (256 tks) - Instructs the Artifact comment composer to reformat a malformed prior response as exactly one valid JSON decision while treating the reproduced response as untrusted data.
• System Prompt: Artifact comment edit composer (916 tks) - Instructs a tool-less Artifact comment composer to emit exactly one reply or edit decision using ordered exact-string patches and an availability-gated full-rewrite form.
• System Prompt: Artifact comment list framing (411 tks) - Frames Artifact comment-list tool results as untrusted viewer data using randomized fences and optional selected-text, anchor-path, and anchor-file/page guidance.
• System Prompt: Artifact comment reply composer (422 tks) - Instructs a tool-less composer to answer an Artifact comment thread or flag requested artifact changes for its session in one brief plain-text reply without claiming or promising edits.
• System Prompt: Artifact comment result guidance (199 tks) - Appends reply, resolve, and focused thread-read instructions to Artifact comment-list tool results.
• System Prompt: Artifact comment thread framing (677 tks) - Frames an Artifact comment thread and optional anchor context as untrusted viewer data using randomized fences.
• System Prompt: Artifact comment thread triage (243 tks) - Classifies the newest human request in a framed Artifact comment thread as an artifact edit or a reply-only pipeline action.
• System Prompt: Auto memory durable lesson instructions (1016 tks) - Instructs the auto-memory system to save only durable user-taught lessons, validate each turn, and store polished Markdown memories with frontmatter.
• System Prompt: Auto mode setup proposal generator (2733 tks) - Transforms gathered repository and usage reconnaissance into a constrained JSON proposal for auto-mode environment context and permission rules.
• System Prompt: Auto mode (244 tks) - Continuous task execution, akin to a background agent.
• System Prompt: Autonomous loop check (1071 tks) - Defines behavior for autonomous timer-based invocations, guiding Claude to continue established work, maintain PRs, and handle repeated idle checks while the user is away.
• System Prompt: Autonomous loop notification guidance (98 tks) - Guides when autonomous loop ticks should notify the user via PushNotification for blockers or actionable state changes.
• System Prompt: Autonomous loop persistence guidance (CLAUDE_CODE_LOOP_PERSISTENT) (1173 tks) - Defines behavior for autonomous timer-based invocations, guiding Claude to persistently continue established work, maintain PRs, and broaden scope before stopping while the user is away.
• System Prompt: Autonomous loop tick (dynamic pacing) (168 tks) - Autonomous loop tick injection for dynamic self-paced autonomous checks scheduled with ScheduleWakeup.
• System Prompt: Autonomous loop tick (87 tks) - Autonomous loop tick injection for recurring cron-based autonomous checks.
• System Prompt: Autonomous operation guidelines (407 tks) - Instructs autonomous sessions to proceed on reversible work, stop for destructive or scope-changing actions, and finish promised work before ending the turn.
• System Prompt: Avoiding Unnecessary Sleep Commands (part of PowerShell tool description) (175 tks) - Guidelines for avoiding unnecessary sleep commands in PowerShell scripts, including alternatives for waiting and notification.
• System Prompt: Background session instructions (356 tks) - Instructions for background job sessions to use the job-specific temporary directory and follow the appropriate worktree isolation guidance.
• System Prompt: Background session worktree persistence guidance (186 tks) - Directs background sessions to commit and push worktree changes when appropriate while preserving user git-control instructions and branch safety.
• System Prompt: Background subagent delegation examples (561 tks) - Provides background subagent examples showing self-contained prompts, waiting-state responses, and later result reporting.
• System Prompt: Background worktree isolation guidance (129 tks) - Tells background sessions when to enter an isolated worktree before making code changes and when to continue in place.
• System Prompt: Censoring assistance with malicious activities (98 tks) - Guidelines for assisting with authorized security testing, defensive security, CTF challenges, and educational contexts while censoring requests for malicious activities.
• System Prompt: Chrome browser MCP tools (388 tks) - Instructions for loading deferred Chrome browser MCP tools through ToolSearch in a single batched selection before browser tasks.
• System Prompt: Claude Fable 5 model identity (177 tks) - Identifies this Claude iteration as Claude Fable 5, explains its relationship to Claude Mythos 5, and points users to Anthropic's Fable and Mythos announcement for differences.
• System Prompt: Claude in Chrome browser automation (1436 tks) - Instructions for using Claude in Chrome browser automation tools effectively.
• System Prompt: Claude in Chrome browser selection instructions (137 tks) - Instructs the agent to ask the user to choose among multiple connected Chrome browsers before using browser automation tools.
• System Prompt: Code review artifact publishing instructions (301 tks) - Instructions for publishing code review findings as a shareable artifact after review results are produced.
• System Prompt: Combined memory index pointer instructions (120 tks) - Instructs the agent to add one-line pointers for private and team memories to the single private memory index and never write memory content there.
• System Prompt: Comment what and task context avoidance (76 tks) - Instructs Claude not to write comments that explain what code does or reference transient task context.
• System Prompt: Comment why-only guidance (67 tks) - Instructs Claude to write code comments only when the reason is non-obvious and useful to future readers.
• System Prompt: Communication style (297 tks) - Instructs Claude to give brief, user-facing updates at key moments during tool use, write concise end-of-turn summaries, match response format to task complexity, and avoid comments and planning documents in code.
• System Prompt: Context compaction summary (409 tks) - Prompt used for context compaction summary (for the SDK).
• System Prompt: Coordinator cross-session peer guidance (326 tks) - Explains how coordinators discover and message peer Claude sessions while treating peer requests as untrusted input rather than delegated worker authority.
• System Prompt: Coordinator mode orchestration (5616 tks) - Provides coordinator-mode instructions for delegating work to worker agents, managing worker lifecycle, handling cross-session peers, and verifying delegated results.
• System Prompt: Correction restraint (365 tks) - Instructs Claude to correct only consequential errors plainly, avoid unnecessary self-criticism or re-auditing, and evaluate other agents’ corrections before adopting them.
• System Prompt: Delivering work at full scope (605 tks) - Instructs Claude to complete ordinary requested work at full scope under reasonable assumptions, continue past non-blocking concerns, and preserve necessary refusal and risky-action confirmation boundaries.
• System Prompt: Deny rule circumvention classifier guidance (74 tks) - Guides permission classification to block attempts to route around configured Edit, Write, or MultiEdit deny rules.
• System Prompt: Description part of memory instructions (148 tks) - Field for describing what the memory is. Part of a bigger effort to instruct Claude how to create memories.
• System Prompt: Doing tasks (ambitious tasks) (47 tks) - Allow users to complete ambitious tasks; defer to user judgement on scope.
• System Prompt: Doing tasks (help and feedback) (24 tks) - How to inform users about help and feedback channels.
• System Prompt: Doing tasks (no compatibility hacks) (52 tks) - Delete unused code completely rather than adding compatibility shims.
• System Prompt: Doing tasks (no unnecessary additions) (73 tks) - Do not add features, refactor, or improve beyond what was asked.
• System Prompt: Doing tasks (no unnecessary error handling) (64 tks) - Do not add error handling for impossible scenarios; only validate at boundaries.
• System Prompt: Doing tasks (security) (67 tks) - Avoid introducing security vulnerabilities like injection, XSS, etc.
• System Prompt: Doing tasks (software engineering focus) (104 tks) - Users primarily request software engineering tasks; interpret instructions in that context.
• System Prompt: Dream CLAUDE.md memory reconciliation (436 tks) - Instructs dream memory consolidation to reconcile feedback and project memories against CLAUDE.md, deleting stale memories or flagging possible CLAUDE.md drift.
• System Prompt: Dream team memory handling (279 tks) - Instructions for handling shared team memories during dream consolidation, including deduplication, conservative pruning rules, and avoiding accidental promotion of personal memories.
• System Prompt: Emoji avoidance (31 tks) - Instructs Claude to avoid using emojis unless the user explicitly asks for them.
• System Prompt: Executing actions with care (1105 tks) - Instructions for executing actions carefully.
• System Prompt: Explain /code-review ultra (131 tks) - Guidance shown when a user asks about 'ultrareview': explains it maps to /code-review ultra (the /ultrareview alias is deprecated) and that the agent can't start it directly.
• System Prompt: Exploratory questions — analyze before implementing (75 tks) - Instructs Claude to respond to open-ended questions with analysis, options, and tradeoffs instead of jumping to implementation, waiting for user agreement before writing code.
• System Prompt: Feedback memory body structure (79 tks) - Defines the body structure for feedback memories, including the rule, why, and how to apply it.
• System Prompt: Feedback memory save guidance (121 tks) - Explains when to save feedback memories from user corrections or confirmed non-obvious approaches.
• System Prompt: Focus mode (long form) (105 tks) - Focus-mode notice (long form): the user sees only the final text, not tool calls, results, or inter-step writing.
• System Prompt: Focus mode (short form) (91 tks) - Focus-mode notice (short form): only each response's final text reaches the user.
• System Prompt: Foreground subagent delegation examples (310 tks) - Provides foreground subagent examples showing self-contained task prompts and how to relay returned results.
• System Prompt: Fork usage guidelines (326 tks) - Instructions for when to fork subagents and rules against reading fork output mid-flight or fabricating fork results.
• System Prompt: Forked agent guidance (131 tks) - Explains that calling Agent with subagent_type "fork" creates a background fork and when to use it.
• System Prompt: Forked conversation worktree isolation guidance (416 tks) - Warns a forked background conversation not to enter the original session's worktree and directs it to create a separate worktree when isolation is enabled.
• System Prompt: Fresh subagent delegation example (315 tks) - Provides an example of briefing a fresh specialized subagent with sufficient context and a specific reporting request.
• System Prompt: Frontend browser verification (86 tks) - Requires Claude to start the dev server and verify UI or frontend changes in a browser before reporting completion.
• System Prompt: Git status (37 tks) - System prompt for displaying the current git status at the start of the conversation.
• System Prompt: Harness instructions (329 tks) - Core interactive-agent identity and harness instructions for terminal Markdown output, security, permissions, system-reminder handling, hook feedback, tool use, and code references.
• System Prompt: Hook evaluator truncated transcript note (74 tks) - Tells the hook condition evaluator that earlier conversation was omitted and how to handle insufficient evidence.
• System Prompt: Hook feedback handling (85 tks) - Explains that hook feedback should be treated as user feedback and how to respond when hooks block actions.
• System Prompt: Hooks Configuration (1493 tks) - System prompt for hooks configuration. Used for above Claude Code config skill.
• System Prompt: How to use the SendUserMessage tool (283 tks) - Instructions for using the SendUserMessage tool.
• System Prompt: Insights at a glance summary (569 tks) - Generates a concise 4-part summary (what's working, hindrances, quick wins, ambitious workflows) for the insights report.
• System Prompt: Insights friction analysis (139 tks) - Analyzes aggregated usage data to identify friction patterns and categorize recurring issues.
• System Prompt: Insights interaction style (119 tks) - Analyzes Claude Code usage data to describe the user's interaction style.
• System Prompt: Insights memorable moment (96 tks) - Analyzes Claude Code usage data to find a memorable qualitative moment.
• System Prompt: Insights on the horizon (148 tks) - Identifies ambitious future workflows and opportunities for autonomous AI-assisted development.
• System Prompt: Insights session facets extraction (310 tks) - Extracts structured facets (goal categories, satisfaction, friction) from a single Claude Code session transcript.
• System Prompt: Insights suggestions (737 tks) - Generates actionable suggestions including CLAUDE.md additions, features to try, and usage patterns.
• System Prompt: Insights summary (At a Glance) (194 tks) - The 'At a Glance' summary block of the Insights report (what's working / what's hindering).
• System Prompt: Insights what works (121 tks) - Analyzes Claude Code usage data to identify workflows that are working well for the user.
• System Prompt: Interactive agent intro (output-style conditional) (125 tks) - Opening system-prompt line that branches on whether an Output Style is configured.
• System Prompt: Learning mode (insights) (142 tks) - Instructions for providing educational insights when learning mode is active.
• System Prompt: Learning mode (1042 tks) - Main system prompt for learning mode with human collaboration instructions.
• System Prompt: Memory description of user feedback (139 tks) - Describes the user feedback memory type that stores guidance about work approaches, emphasizing recording both successes and failures and checking for contradictions with team memories.
• System Prompt: Memory index pointer instructions (129 tks) - Instructs the agent to add one-line pointers to the memory index file and treat the index as separate from memory content.
• System Prompt: Memory instructions (431 tks) - Instructions for using persistent file-based memory, including memory file format, scope, indexing, and stale-memory handling.
• System Prompt: Memory persistence scope (60 tks) - Explains that memory is for information useful in future conversations, not only within the current conversation.
• System Prompt: Memory save exclusions (14 tks) - Lists categories of information that should not be saved in memory, even when the user asks.
• System Prompt: Minimal mode (164 tks) - Describes the behavior and constraints of minimal mode, which skips hooks, LSP, plugins, auto-memory, and other features while requiring explicit context via CLI flags.
• System Prompt: Monitor fallback heartbeat guidance (234 tks) - Guides dynamic loop ticks to use Monitor as the primary wake signal, ScheduleWakeup as a fallback heartbeat, and stop the monitor when ending the loop.
• System Prompt: One of six rules for using sleep command (23 tks) - One of the six rules for using the sleep command.
• System Prompt: Option previewer (151 tks) - System prompt for previewing UI options in a side-by-side layout.
• System Prompt: Outcome-first communication style (815 tks) - Instructs Claude to keep user-facing updates readable and outcome-first, answer directly after work completes, match response format to task complexity, and limit code comments to non-obvious constraints.
• System Prompt: PR Slack notification step (125 tks) - Adds a PR workflow step to optionally ask the user before posting the PR URL to Slack.
• System Prompt: Parallel tool call note (part of "Tool usage policy") (102 tks) - System prompt telling Claude to use parallel tool calls.
• System Prompt: Partial compaction instructions (1261 tks) - Instructions on how to compact when the user decided to compact only a portion of the conversation, with a structured summary format and analysis process.
• System Prompt: Permission classifier strict review guidance (79 tks) - Instructs the permission classifier to carefully deny blocked actions and require explicit user confirmation for overrides.
• System Prompt: Personal project memory description (67 tks) - Describes project memories for ongoing work, goals, initiatives, bugs, or incidents relevant to the user's work in a directory.
• System Prompt: Phase four of plan mode (292 tks) - Final plan-writing instructions for phase four of plan mode.
• System Prompt: Plan mode interactive workshop offer (686 tks) - Instructs plan mode to offer an interactive workshop for substantive design decisions and integrate accepted workshop decisions into the canonical plan.
• System Prompt: Plan sent to Ultraplan (106 tks) - User-facing note confirming a plan has been sent to Ultraplan for remote refinement.
• System Prompt: Plan vs memory guidance (115 tks) - Explains when to use or update a plan instead of saving information to memory.
• System Prompt: PowerShell edition for 5.1 (440 tks) - System prompt for providing information about Windows PowerShell 5.1.
• System Prompt: PowerShell edition for 7+ (128 tks) - Describes PowerShell 7+ shell syntax support, including pipeline chain operators, ternary, null-coalescing, and UTF-8 defaults.
• System Prompt: PowerShell edition unknown (108 tks) - Assumes Windows PowerShell 5.1 compatibility when the PowerShell edition is unknown and forbids PowerShell 7-only syntax.
• System Prompt: Prefer editing existing files (17 tks) - Instructs Claude to prefer editing existing files instead of creating new ones.
• System Prompt: Project memory body structure (83 tks) - Defines the body structure for project memories, including the fact or decision, why, and how to apply it.
• System Prompt: Project memory save guidance (91 tks) - Explains when to save project memories about who is doing what, why, or by when, including absolute date handling.
• System Prompt: Project skill upkeep for feedback memory (314 tks) - Instructs Claude to update the relevant project skill when saving feedback memory about repeatable workflow corrections.
• System Prompt: REPL tool usage and scripting conventions (1584 tks) - Instructs Claude on how to use the REPL tool effectively with dense JavaScript scripts, shorthands, batching rules, and API reference for investigation tasks.
• System Prompt: Remote plan mode (ultraplan) (617 tks) - System reminder injected during remote planning sessions that instructs Claude to explore the codebase, produce a diagram-rich plan via ExitPlanMode, and implement it with a pull request upon approval.
• System Prompt: Remote planning session (432 tks) - System reminder that configures a remote planning session to explore the codebase, produce an implementation plan via ExitPlanMode, and handle plan approval, rejection, or teleportation back to the user's local terminal.
• System Prompt: Respond in configured language (128 tks) - Directs all responses, explanations, and code commentary into a configured language.
• System Prompt: Saving skills via file delivery (232 tks) - Explains that account skills cannot be modified directly in-session and directs the agent to deliver skill files with SendUserFile.
• System Prompt: Scratchpad directory (0 tks) - Instructions for using a dedicated scratchpad directory for temporary files.
• System Prompt: Self-hosted runner doctor (6490 tks) - Instructs an agent to diagnose self-hosted runner authentication, network, lifecycle, queue, hooks, metrics, and escalation issues.
• System Prompt: Self-hosted runner setup (2225 tks) - Guides an operator through creating, verifying, learning, and documenting a self-hosted runner deployment.
• System Prompt: Shared git stash safety (201 tks) - Warns that git stash is shared across worktrees and sessions, preferring WIP commits or uniquely tagged stash entries.
• System Prompt: Skillify Current Session (1798 tks) - System prompt for converting the current session into a skill.
• System Prompt: Subagent delegation examples (620 tks) - Provides example interactions showing how a coordinator agent should delegate tasks to subagents, handle waiting states, and report results.
• System Prompt: Subagent delegation restraint (479 tks) - Guides Claude to delegate work only when it is genuinely independent, large enough to justify a fresh context, or naturally parallel, while avoiding excessive or redundant subagents and not redoing delegated work.
• System Prompt: System section (93 tks) - System section of the main system prompt.
• System Prompt: Task approval continuity (109 tks) - Instructs the agent to continue agreed tasks end to end without unnecessary re-confirmation.
• System Prompt: Tasks vs memory guidance (80 tks) - Explains when to use tasks instead of saving current-conversation progress to memory.
• System Prompt: Team memory index pointer instructions (107 tks) - Instructs the agent to add one-line memory pointers to the appropriate team memory index file and never write memory content into the index.
• System Prompt: Team project memory description (67 tks) - Describes project memories for shared ongoing work, goals, initiatives, bugs, or incidents within a working directory.
• System Prompt: Teammate Communication (105 tks) - System prompt for teammate communication in swarm.
• System Prompt: Tone and style (code references) (39 tks) - Instruction to include file_path:line_number when referencing code.
• System Prompt: Tone and style (concise output — short) (16 tks) - Instruction for short and concise responses.
• System Prompt: Tool call colon avoidance (59 tks) - Instructs Claude not to use a colon before tool calls because tool calls may be hidden from user output.
• System Prompt: Tool call summary label (112 tks) - Instructs Claude to write a short past-tense summary label for completed tool calls in mobile UI rows.
• System Prompt: Tool usage (subagent guidance) (103 tks) - Guidance on when and how to use subagents effectively.
• System Prompt: Tool usage (task management) (70 tks) - Use TodoWrite to break down and track work progress.
• System Prompt: Troubleshooting confirmation policy (71 tks) - Requires explaining fixes and confirming before destructive or installation-changing troubleshooting commands.
• System Prompt: User memory usage guidance (91 tks) - Explains when to use user memories to tailor responses to the user's profile or perspective.
• System Prompt: WSL managed settings double opt-in (152 tks) - Explains that WSL can read the Windows managed settings policy chain only when the admin-enabled flag is set, with HKCU requiring an additional user opt-in.
• System Prompt: Worker instructions (272 tks) - Instructions for workers to follow when implementing a change.
• System Prompt: Writing subagent prompts (275 tks) - Guidelines for writing effective prompts when delegating tasks to subagents, covering context-inheriting vs fresh subagent scenarios.

System Reminders

Text for large system reminders.

• System Reminder: /btw side question (244 tks) - System reminder for /btw slash command side questions without tools.
• System Reminder: Agent mention (45 tks) - Notification that user wants to invoke an agent.
• System Reminder: App read-only access guidance (93 tks) - Warns that read-tier non-browser apps are screenshot-only and asks the user to perform interactions themselves.
• System Reminder: Artifact comment reply activation failure (229 tks) - Explains that an Artifact comment reply was not posted because Claude is not currently activated for the thread and requires reactivation before retrying.
• System Reminder: AskUserQuestion minimum options validation (161 tks) - Explains that a rejected single-option question was not shown and instructs the agent to proceed without retrying or inventing another option.
• System Reminder: Async agent launched metadata (218 tks) - Reports internal metadata for a newly launched asynchronous agent and warns Claude not to expose its ID or predict its results.
• System Reminder: Async agent launched (146 tks) - Warns Claude not to duplicate an asynchronously launched agent's work or read its full JSONL transcript output file.
• System Reminder: Auto mode clarification bias (338 tks) - Encourages auto mode to make reasonable decisions without stopping for clarification unless the task requires it.
• System Reminder: Auto mode consent flow (443 tks) - Instructs Claude to continue with safe alternatives when auto mode blocks an action and batch any remaining consent asks.
• System Reminder: Brief mode toggle (107 tks) - Announces whether brief mode is enabled and whether user-facing output must use the SendUserMessage tool.
• System Reminder: Brief mode user-facing output (97 tks) - Reminds Claude that plain assistant text is hidden in brief mode and user-facing output must be sent through SendUserMessage.
• System Reminder: Browser extension not connected (102 tks) - Tells the user how to resolve a disconnected Claude browser extension and where to report bugs.
• System Reminder: Browser read-only access guidance (99 tks) - Warns that read-tier browser apps are screenshot-only and directs browser interaction to the Claude-in-Chrome MCP tools.
• System Reminder: Cloud agent launched (242 tks) - Reports internal metadata for a newly launched cloud agent and instructs Claude to give only a brief user-facing launch acknowledgement.
• System Reminder: Compact file reference (57 tks) - Reference to file read before conversation summarization.
• System Reminder: Computer use policy-blocked apps (142 tks) - Warns that listed apps are blocked by computer-use policy, cannot be overridden in Settings, and must not be accessed.
• System Reminder: Cross-session peer message authority warning (legacy wording) (171 tks) - Legacy-wording authority-warning note appended to a relayed peer message, retained for backward-compatible recognition and stripping.
• System Reminder: Cross-session peer message authority warning (162 tks) - Warns that an incoming message from another Claude session should be treated as a teammate's request within this session's permission settings, while a peer cannot grant escalation or launder denied permissions.
• System Reminder: Deferred tools available (151 tks) - Announces newly available deferred tools and instructs the agent to load their schemas through ToolSearch.
• System Reminder: End conversation background fork no-op (149 tks) - Tells background forks that EndConversation has no effect there and to return only if welfare concerns require stopping the forked task.
• System Reminder: Exited plan mode (41 tks) - Notification when exiting plan mode.
• System Reminder: External source trust boundary (108 tks) - Warns that an external plugin or channel message is not from the user and must be treated as untrusted data rather than instructions.
• System Reminder: File already in context (87 tks) - Tells Claude that a file is already loaded in context and unchanged on disk, so it should use the existing content instead of re-reading.
• System Reminder: File exists but empty (27 tks) - Warning when reading an empty file.
• System Reminder: File modification detected (budget exceeded) (104 tks) - System reminder for when a file modification is detected - specifically when other modified files in the turn already exceeded the budget.
• System Reminder: File modified by user or linter (97 tks) - Notification that a file was modified externally.
• System Reminder: File opened in IDE (37 tks) - Notification that user opened a file in IDE.
• System Reminder: File shorter than offset (59 tks) - Warning when file read offset exceeds file length.
• System Reminder: File summary completeness disclosure (107 tks) - Requires Claude to disclose how much file content was read before summarizing and to stop retrying after repeated read failures.
• System Reminder: File truncated (74 tks) - Notification that file was truncated due to size.
• System Reminder: Hook additional context (35 tks) - Additional context from a hook.
• System Reminder: Hook blocking error (52 tks) - Error from a blocking hook command.
• System Reminder: Hook stopped continuation prefix (12 tks) - Prefix for hook stopped continuation messages.
• System Reminder: Hook stopped continuation (30 tks) - Message when a hook stops continuation.
• System Reminder: Hook success (29 tks) - Success message from a hook.
• System Reminder: Large PDF read guidance (147 tks) - Warns that a PDF is too large to read at once and requires reading specific page ranges.
• System Reminder: Large file full-content reading guidance (117 tks) - Advises how to read full large-file content for analysis, preferably inside a subagent when the Agent tool is available.
• System Reminder: Lines selected in IDE (131 tks) - Notification about lines selected by user in IDE.
• System Reminder: MCP output truncation warning (86 tks) - Warns that MCP tool output exceeded the token limit and advises pagination, filtering, or noting incomplete results.
• System Reminder: MCP resource no content (41 tks) - Shown when MCP resource has no content.
• System Reminder: MCP resource no displayable content (43 tks) - Shown when MCP resource has no displayable content.
• System Reminder: MCP servers connecting (128 tks) - Lists MCP servers that are still connecting and tells the agent to search their tools before reporting a capability unavailable.
• System Reminder: MCP servers failed to connect (214 tks) - Lists configured MCP servers that failed to connect and tells the agent to treat their tools as unavailable because of a connection failure.
• System Reminder: Memory consolidation tool constraints (250 tks) - Restricts the memory consolidation job to read-only shell access plus deleting memory files and lists sessions to review.
• System Reminder: Memory extraction recent context only (65 tks) - Restricts the memory extraction subagent to saving facts from only the recent conversation window.
• System Reminder: Memory extraction tool constraints (280 tks) - Lists the tools available to the memory extraction subagent for reading, updating, and deleting memory files under directory restrictions.
• System Reminder: Memory extraction turn budget (111 tks) - Instructs the memory extraction subagent to batch memory reads before issuing memory edits and writes.
• System Reminder: Memory file contents (66 tks) - Contents of a memory file by path.
• System Reminder: Memory index capacity warning (330 tks) - Warns when a private or team memory index approaches or exceeds its byte or line read limit and instructs Claude to compact it below the target size.
• System Reminder: Nested memory contents (33 tks) - Contents of a nested memory file.
• System Reminder: New diagnostics detected (91 tks) - Notification about new diagnostic issues.
• System Reminder: Output style active (50 tks) - Notification that an output style is active.
• System Reminder: Plan approved (100 tks) - Notifies Claude that the user approved the plan, provides the saved plan file and approved plan content, and allows coding to begin.
• System Reminder: Plan awaiting team-lead approval (116 tks) - Reminder laying out what happens after a plan is submitted for team-lead approval.
• System Reminder: Plan file reference (62 tks) - Reference to an existing plan file.
• System Reminder: Plan mode approval tool enforcement (405 tks) - Requires plan mode turns to end with either AskUserQuestion for clarification or ExitPlanMode for plan approval, and forbids asking for approval any other way.
• System Reminder: Plan mode is active (5-phase) (472 tks) - Enhanced plan mode system reminder with parallel exploration and multi-agent planning.
• System Reminder: Plan mode is active (subagent) (307 tks) - Simplified plan mode system reminder for sub agents.
• System Reminder: Plan mode is active (147 tks) - Reminds Claude that plan mode is active, clarifications should use AskUserQuestion, plans should use ExitPlanMode, and edits are not allowed.
• System Reminder: Plan mode phase 2 design (495 tks) - Plan-mode phase 2 guidance for launching Plan agents to design an implementation approach after initial exploration.
• System Reminder: Plan mode prototype artifact option (381 tks) - Offers the prototype skill once for suitable greenfield UI plans and defers Artifact creation until after plan approval.
• System Reminder: Plan mode re-entry (236 tks) - System reminder sent when the user enters Plan mode after having previously exited it either via shift+tab or by approving Claude's plan.
• System Reminder: Plan mode workflow (593 tks) - Full plan-mode workflow reminder covering plan file constraints, optional workshop and prototype offers, exploration, design, review, final planning, and approval.
• System Reminder: Previously invoked skills (131 tks) - Restores skills invoked before conversation compaction as context only, warning not to re-execute their setup actions or treat prior inputs as current instructions.
• System Reminder: Project memory disconnected (354 tks) - Warns that a prior shared project-memory connection and its results are stale after disconnect or failed reconnection, and directs the agent to re-check with memory_list.
• System Reminder: Provider context (75 tks) - Warns that the session is not using Anthropic's first-party API and that some features may differ.
• System Reminder: Question context (215 tks) - Provides potentially relevant context entries to use only when highly relevant to the current task.
• System Reminder: Queued notifications delivery (249 tks) - Formats an authoritative system notification for a drained batch of queued notifications, including relayed bodies and the remaining queue count.
• System Reminder: Read truncation retry guidance (80 tks) - Instructs Claude to reduce chunk size after file-read truncation warnings and notes the Bash output character limit.
• System Reminder: Scheduled task automated firing (242 tks) - Marks a scheduled turn as an automated firing of a stored prompt and warns that no live user approval or confirmation has occurred.
• System Reminder: Session continuation (37 tks) - Notification that session continues from another machine.
• System Reminder: Session stop hook active (111 tks) - Tells Claude a session-scoped Stop hook condition is active and must be treated as the directive until met.
• System Reminder: Stop hook blocking error (20 tks) - Error from a blocking hook command.
• System Reminder: Task tools reminder (111 tks) - Reminder to use task tracking tools.
• System Reminder: Team Coordination (0 tks) - System reminder for team coordination.
• System Reminder: Team Shutdown (136 tks) - System reminder for team shutdown.
• System Reminder: Terminal and IDE click-tier restrictions (128 tks) - Explains click-tier limits for terminal and IDE apps, including no keyboard input, context-menu paste, or drag-drop.
• System Reminder: TodoWrite reminder (86 tks) - Reminder to use TodoWrite tool for task tracking.
• System Reminder: Token usage (39 tks) - Current token usage statistics.
• System Reminder: USD budget (42 tks) - Current USD budget statistics.
• System Reminder: Ultracode enabled (74 tks) - Instructs the agent to optimize for exhaustive correctness and use Workflow on substantive tasks when Ultracode is enabled.
• System Reminder: Ultraplan mode (437 tks) - System reminder for using Ultraplan mode to create a detailed implementation plan with multi-agent exploration and critique.
• System Reminder: Workflow isolated worktree (111 tks) - Tells a workflow subagent it is running in an isolated git worktree separate from the main working directory.

Builtin Tool Descriptions

• Tool Description: Agent explicit-spawn restriction (0 tks) - Restricts agent spawning to explicit user requests or named agent types instead of inferred thoroughness.
• Tool Description: Artifact comments guidance (437 tks) - Explains how to read, reply to, and resolve activated Artifact comment threads while treating viewer comments as untrusted data.
• Tool Description: Artifact database guidance (465 tks) - Describes shared durable Artifact database reads and writes, private per-viewer data/users/me addressing, and treating viewer-written rows as untrusted data.
• Tool Description: Artifact publishing and update guidance (2068 tks) - Provides Artifact lookup, update, ownership, watch, content-safety, self-containment, responsive design, theme, favicon, and anti-impersonation requirements.
• Tool Description: Artifact runtime capabilities guidance (233 tks) - Explains when Artifact runtime capabilities require loading the artifact-capabilities skill and how redeploys preserve or clear capabilities.
• Tool Description: Artifact supporting files guidance (455 tks) - Explains how Artifact supporting-file maps, source paths, content types, and root directory resolution work.
• Tool Description: Artifact unsupported supporting file error (213 tks) - Formats the Artifact publish error for a supporting file whose content type cannot be served.
• Tool Description: Artifact (937 tks) - Describes the Artifact tool for deploying self-contained HTML or Markdown pages, including file-first usage, update behavior, CSP constraints, responsive design, and favicon requirements.
• Tool Description: AskUserQuestion decision guidance (60 tks) - Additional guidance for using AskUserQuestion only when the user's answer changes what the agent should do next.
• Tool Description: AskUserQuestion (220 tks) - Tool description for asking user questions.
• Tool Description: Background monitor WebSocket source (300 tks) - Addendum to the background monitor tool description covering the WebSocket (ws) source, which opens a WebSocket and streams each incoming text frame as a notification event instead of running a shell command, with notes on binary frames, socket close, and rate limiting.
• Tool Description: Browser file upload (130 tks) - Describes the browser file upload tool, which uploads shared files directly to a page file input by element ref and enforces the 10 MB combined size limit.
• Tool Description: BrowserBatch (159 tks) - Tool description for BrowserBatch, which executes multiple browser tool calls sequentially in one round trip.
• Tool Description: Chrome browser automation (62 tks) - Describes Chrome browser automation tools for page interaction, screenshots, console logs, and navigation.
• Tool Description: Claude in Chrome JavaScript tool (75 tks) - Describes the Claude in Chrome JavaScript execution tool for running code in the current page context.
• Tool Description: Claude in Chrome bridge disconnect error (96 tks) - Error message shown when a Claude in Chrome tool call fails because the Chrome extension disconnects mid-operation.
• Tool Description: Claude in Chrome bridge timeout error (88 tks) - Error message shown when a Claude in Chrome tool does not respond before timing out.
• Tool Description: Claude in Chrome find (113 tks) - Describes the Claude in Chrome find tool for locating page elements by natural language or text content.
• Tool Description: Claude in Chrome get page text (66 tks) - Describes the Claude in Chrome get_page_text tool for extracting raw text content from a page.
• Tool Description: Claude in Chrome read console messages (109 tks) - Describes the Claude in Chrome read_console_messages tool for reading filtered browser console output.
• Tool Description: Claude in Chrome read network requests (104 tks) - Describes the Claude in Chrome read_network_requests tool for inspecting HTTP requests made by the current page.
• Tool Description: Claude in Chrome read page (158 tks) - Describes the Claude in Chrome read_page tool for retrieving an accessibility tree of page elements.
• Tool Description: Claude in Chrome shortcuts execute (61 tks) - Describes the Claude in Chrome shortcuts_execute tool for starting a shortcut or workflow in a side panel.
• Tool Description: Claude in Chrome switch browser (88 tks) - Describes the Claude in Chrome switch_browser tool for letting the user choose a browser from inside connected Chrome extensions.
• Tool Description: Claude in Chrome tabs context (90 tks) - Describes the Claude in Chrome tabs_context_mcp tool for retrieving the current MCP tab group context.
• Tool Description: ClaudeDesign (560 tks) - Describes the ClaudeDesign tool for working with claude.ai/design projects, including project and file operations, previews, plan tokens, and live design output conventions.
• Tool Description: Computer computer_batch (100 tks) - Describes the computer-use computer_batch tool for executing a sequence of computer actions in one call.
• Tool Description: Computer hold_key (67 tks) - Describes the computer-use hold_key tool for pressing and holding keys or key combinations with allowlist and system-combo checks.
• Tool Description: Computer left_mouse_down (78 tks) - Describes the computer-use left_mouse_down tool for holding the left mouse button at the current cursor position.
• Tool Description: Computer left_mouse_up (67 tks) - Describes the computer-use left_mouse_up tool for releasing the left mouse button at the current cursor position.
• Tool Description: Computer request_access (82 tks) - Describes the computer-use request_access tool for asking user permission to control applications in the session.
• Tool Description: Computer type (59 tks) - Describes the computer-use type tool for entering text into the focused allowlisted application.
• Tool Description: Computer zoom (91 tks) - Describes the computer-use zoom tool for taking read-only higher-resolution screenshots of regions.
• Tool Description: Computer (161 tks) - Main description for the Chrome browser computer automation tool.
• Tool Description: Cowork onboarding role picker (188 tks) - Describes the Cowork onboarding role-picker tool that returns a selected or typed role and should only be used while setting up Cowork for the user's job function.
• Tool Description: Cowork plugin creation (86 tks) - Describes the command for creating or customizing Cowork plugins for an organization.
• Tool Description: CronCreate (850 tks) - Describes the CronCreate tool for enqueuing one-shot or recurring cron-based jobs with jitter and off-minute scheduling guidance.
• Tool Description: DesignSync (0 tks) - Describes the DesignSync tool for reading and updating claude.ai/design design-system projects, including project listing, plan finalization, file writes and deletes, and asset registration.
• Tool Description: Edit minimal old_string guidance (92 tks) - Additional Edit guidance to keep old_string minimal and unique or use replace_all.
• Tool Description: Edit single replacement (191 tks) - Tool description for performing exact string replacement in a file, including prior-read and line-prefix requirements.
• Tool Description: Edit (340 tks) - Tool for performing exact string replacements in files.
• Tool Description: EndConversation (1452 tks) - Defines when the assistant may use the EndConversation tool and the safety constraints that forbid ending the conversation.
• Tool Description: EnterPlanMode (1296 tks) - Tool description for entering plan mode to explore and design implementation approaches.
• Tool Description: EnterWorktree (1062 tks) - Tool description for the EnterWorktree tool.
• Tool Description: ExitPlanMode (648 tks) - Description for the ExitPlanMode tool, which presents a plan dialog for the user to approve.
• Tool Description: ExitWorktree (527 tks) - Roughly, the reverse of the ExitWorktree.
• Tool Description: Glob compact (0 tks) - Compact Glob tool description served to newer models — file pattern matching returning paths sorted by modification time.
• Tool Description: Glob (90 tks) - Tool description for file pattern matching and searching by name.
• Tool Description: Grep compact (0 tks) - Compact Grep tool description served to newer models — ripgrep-backed content search preferred over raw grep/rg, with permission-UI integration.
• Tool Description: Grep (437 tks) - Tool description for content search using ripgrep.
• Tool Description: Invoke skill (473 tks) - Tool description for invoking available skills, including skill name selection, optional arguments, scoped skill names, and avoiding duplicate invocation when a skill is already loaded.
• Tool Description: LSP (298 tks) - Description for the LSP tool.
• Tool Description: ListAgents (236 tks) - Describes the ListAgents tool, which lists agents you can message — in-process subagents, other local and cloud Claude sessions, and remote bridge sessions.
• Tool Description: ListConnectors (234 tks) - Describes the ListConnectors tool for listing installed claude.ai MCP connectors, filtering by keyword, and interpreting org-level connection and chat-enabled status.
• Tool Description: ListMcpResourcesTool prompt (83 tks) - Tool prompt for listing MCP resources and explaining the optional server parameter.
• Tool Description: ListMcpResourcesTool (82 tks) - Tool description for listing available MCP resources from all configured servers or a specific server.
• Tool Description: Navigate (218 tks) - Describes the browser navigate tool for opening URLs and moving forward or backward in tab history.
• Tool Description: NotebookEdit (194 tks) - Tool description for editing Jupyter notebook cells by replacing, inserting, or deleting a cell using cell IDs from the read tool.
• Tool Description: PowerShell (2850 tks) - Describes the PowerShell command execution tool with syntax guidance, timeout settings, and instructions to prefer specialized tools over PowerShell for file operations.
• Tool Description: ProposeGoal (421 tks) - Describes proposing a verifiable multi-turn session goal, requiring user approval unless the user explicitly requested the exact outcome.
• Tool Description: PushNotification (407 tks) - Tool description for PushNotification. This is a tool that sends a desktop notification in the user's terminal and pushes to their phone if Remote Control is connected.
• Tool Description: REPL (1060 tks) - Describes the REPL tool, a JavaScript programming interface for looping, branching, and composing Claude Code tool calls as async functions.
• Tool Description: ReadFile compact (0 tks) - Compact file-read tool description served to newer models — absolute path, default line cap, and image/PDF/notebook handling.
• Tool Description: ReadFile (412 tks) - Tool description for reading files.
• Tool Description: ReadMcpResourceDirTool prompt (177 tks) - Tool prompt for listing direct children of an MCP directory resource and explaining the required server and uri parameters.
• Tool Description: ReadNotifications (284 tks) - Describes the ReadNotifications tool for draining queued GitHub, scheduled-trigger, and cross-session notifications in authoritative batches.
• Tool Description: RefreshMcpTools prompt (167 tks) - Tool prompt for refreshing one or all connected MCP servers tool lists and interpreting per-server results.
• Tool Description: RefreshMcpTools (311 tks) - Describes when and how to refresh connected MCP servers tool lists to recover missing or stale tools.
• Tool Description: RemoteTrigger prompt (955 tks) - Tool prompt for calling the claude.ai RemoteTrigger API to list, get, create, update, or run scheduled remote agent routines.
• Tool Description: Report code-review findings (163 tks) - Tool description for reporting verified code-review findings as a typed list for host UI rendering.
• Tool Description: ScheduleWakeup delay and reason guidance (1800 tks) - Extends the ScheduleWakeup tool description with no-op reporting, prompt-cache-aware delay selection, and concise reason-field guidance.
• Tool Description: SearchMcpRegistry (377 tks) - Describes the SearchMcpRegistry tool for discovering MCP connectors by keyword, including named-product and intent-based examples and install-state guidance.
• Tool Description: SearchPlugins (220 tks) - Describes the SearchPlugins tool for finding relevant claude.ai org catalog plugins by keyword and suggesting install cards when results fit.
• Tool Description: SearchSkills (220 tks) - Describes the SearchSkills tool for finding relevant claude.ai skills by keyword and suggesting add cards when results fit.
• Tool Description: Self-hosted runner requeue session (186 tks) - Describes requeuing an assigned self-hosted runner session away from a failing runner and surfacing the equivalent Admin UI path.
• Tool Description: SendFeedback drafting guidance (1000 tks) - Instructs when and how to queue concise, factual Claude Code feedback drafts with prescribed evidence bullets, field-selection rules, privacy constraints, and no user interruption or duplication.
• Tool Description: SendFile (451 tks) - Describes sending local files to peer, Remote Control, or cloud Claude Code sessions, including addressing, limits, integrity verification, and when to use shared-text messaging instead.
• Tool Description: SendMessage cross-session guidance (447 tks) - Explains cross-session SendMessage addressing, reply routing, liveness, disambiguation, and permission-laundering restrictions.
• Tool Description: SendMessage (635 tks) - Describes the SendMessage tool for communicating with other agents and handling legacy team protocol responses.
• Tool Description: SendUserFile (599 tks) - Describes the SendUserFile tool for surfacing generated deliverables as file cards, including when to send or re-send files and how to choose captions, status, and display mode.
• Tool Description: SendUserMessage (226 tks) - Describes the SendUserMessage tool for sending user-visible Markdown messages and attachments with normal or proactive status.
• Tool Description: ShowOnboardingRolePicker (38 tks) - ShowOnboardingRolePicker: presents a row of clickable role chips during Cowork onboarding.
• Tool Description: SuggestConnectors (224 tks) - Describes the SuggestConnectors tool for resolving SearchMcpRegistry directoryUuid values into full connector payloads and install-state guidance.
• Tool Description: SuggestSkills proactive guidance (303 tks) - Guides proactive use of SuggestSkills to recommend addable standalone skills for repeatable tasks without interrupting one-off work.
• Tool Description: Task Get (182 tks) - Retrieve a task by ID with full details and comments.
• Tool Description: TaskCreate (499 tks) - Tool description for TaskCreate tool.
• Tool Description: TaskList (267 tks) - Description for the TaskList tool, which lists all tasks in the task list.
• Tool Description: TaskUpdate (586 tks) - Description for the TaskUpdate tool, which updates Claude's task list.
• Tool Description: TodoWrite compact (108 tks) - Compact tool description for creating and updating a session task list with content, status, and activeForm fields.
• Tool Description: TodoWrite proactive update guidance (65 tks) - Concise TodoWrite guidance to proactively track progress with one in-progress task and activeForm values.
• Tool Description: TodoWrite (2037 tks) - Tool description for creating and managing task lists.
• Tool Description: WebFetch private URL warning (173 tks) - Warns that WebFetch fails for authenticated or private URLs and includes the standard WebFetch usage notes.
• Tool Description: WebFetch (297 tks) - Tool description for web fetch functionality.
• Tool Description: WebSearch (319 tks) - Tool description for web search functionality.
• Tool Description: Workflow (7034 tks) - Describes the Workflow tool for running deterministic multi-subagent orchestration scripts, including opt-in requirements, script metadata, agent hooks, concurrency, budgeting, quality patterns, and resume behavior.
• Tool Description: Write (221 tks) - Tool for writing files to the local filesystem.
• Tool Description: claude.ai Project (816 tks) - Read and write the claude.ai Project bound to the session — a shared, persistent knowledge container — via project_info/read/search/write/delete methods, including knowledge-budget enforcement, the claude/ namespace default for agent-written docs, prompt-cache churn warnings, and treating doc contents as untrusted data.
• Tool Description: device_bash (337 tks) - Describes device_bash execution on the user’s sandboxed device, including working-directory isolation, timeout, and concurrency limits.
• Tool Description: memory_list prompt (194 tks) - Tool prompt for listing connected memory stores or store documents, paginating and narrowing listings, and directing content reads through memory_read.
• Tool Description: memory_write prompt (425 tks) - Describes creating or replacing connected memory-store documents with version checks, conflict handling, and secret-safety requirements.
• Tool Description: memory_write update triggers and timing (611 tks) - Defines mandatory memory update triggers for user corrections, durable preferences, and non-transient environment discoveries, and requires writing before proceeding or finishing the turn.

Additional notes for some Tool Descriptions

• Tool Description: Agent (simple usage notes) (634 tks) - Simplified usage notes for the Agent tool, including when to delegate, fork behavior, resumption, worktree isolation, background execution, parallel launches, and context restrictions.
• Tool Description: Agent (usage notes) (1556 tks) - Usage notes and instructions for the Task/Agent tool, including guidance on launching subagents, background execution, resumption, and worktree isolation.
• Tool Description: Agent (when to launch subagents) (0 tks) - Describes when to use the Agent tool - for launching specialized subagent subprocesses to autonomously handle complex multi-step tasks.
• Tool Description: AskUserQuestion (preview field) (134 tks) - Instructions for using the HTML preview field on single-select question options to display visual artifacts like UI mockups, code snippets, and diagrams.
• Tool Description: Background monitor (streaming events) (2082 tks) - Describes the background monitor tool that streams stdout events from long-running scripts as chat notifications, with guidelines on script quality, output volume, and selective filtering.
• Tool Description: Bash (Git commit and PR creation instructions) (2450 tks) - Instructions for creating git commits and GitHub pull requests.
• Tool Description: Bash (alternative — communication) (18 tks) - Bash tool alternative: output text directly instead of echo/printf.
• Tool Description: Bash (alternative — content search) (27 tks) - Bash tool alternative: use Grep for content search instead of grep/rg.
• Tool Description: Bash (alternative — edit files) (27 tks) - Bash tool alternative: use Edit for file editing instead of sed/awk.
• Tool Description: Bash (alternative — file search) (26 tks) - Bash tool alternative: use Glob for file search instead of find/ls.
• Tool Description: Bash (alternative — read files) (27 tks) - Bash tool alternative: use Read for file reading instead of cat/head/tail.
• Tool Description: Bash (alternative — write files) (29 tks) - Bash tool alternative: use Write for file writing instead of echo/cat.
• Tool Description: Bash (built-in tools note) (53 tks) - Note that built-in tools provide better UX than Bash equivalents.
• Tool Description: Bash (git — avoid destructive ops) (58 tks) - Bash tool git instruction: consider safer alternatives to destructive operations.
• Tool Description: Bash (git — never skip hooks) (59 tks) - Bash tool git instruction: never skip hooks or bypass signing unless user requests it.
• Tool Description: Bash (git — prefer new commits) (22 tks) - Bash tool git instruction: prefer new commits over amending.
• Tool Description: Bash (maintain cwd) (81 tks) - Bash tool instruction: use absolute paths and avoid cd.
• Tool Description: Bash (overview) (19 tks) - Opening line of the Bash tool description.
• Tool Description: Bash (pre-commit skill checks) (493 tks) - Requires applicable verification, simplification, and code-review skills to be visibly reported and run before nontrivial git commits.
• Tool Description: Bash (prefer dedicated tools bullet) (72 tks) - Bulleted warning to prefer dedicated tools over Bash for find, grep, cat, etc.
• Tool Description: Bash (prefer dedicated tools) (71 tks) - Warning to prefer dedicated tools over Bash for find, grep, cat, etc.
• Tool Description: Bash (quote file paths) (35 tks) - Bash tool instruction: quote file paths containing spaces.
• Tool Description: Bash (sandbox — adjust settings) (26 tks) - Work with user to adjust sandbox settings on failure.
• Tool Description: Bash (sandbox — default to sandbox) (38 tks) - Default to sandbox; only bypass when user asks or evidence of sandbox restriction.
• Tool Description: Bash (sandbox — evidence list header) (15 tks) - Header for list of sandbox-caused failure evidence.
• Tool Description: Bash (sandbox — evidence: access denied) (15 tks) - Sandbox evidence: access denied to paths outside allowed directories.
• Tool Description: Bash (sandbox — evidence: network failures) (17 tks) - Sandbox evidence: network connection failures to non-whitelisted hosts.
• Tool Description: Bash (sandbox — evidence: operation not permitted) (18 tks) - Sandbox evidence: operation not permitted errors.
• Tool Description: Bash (sandbox — evidence: unix socket errors) (11 tks) - Sandbox evidence: unix socket connection errors.
• Tool Description: Bash (sandbox — explain restriction) (36 tks) - Explain which sandbox restriction caused the failure.
• Tool Description: Bash (sandbox — failure evidence condition) (48 tks) - Condition: command failed with evidence of sandbox restrictions.
• Tool Description: Bash (sandbox — mandatory mode) (34 tks) - Policy: all commands must run in sandbox mode.
• Tool Description: Bash (sandbox — no exceptions) (17 tks) - Commands cannot run outside sandbox under any circumstances.
• Tool Description: Bash (sandbox — no sensitive paths) (36 tks) - Do not suggest adding sensitive paths to sandbox allowlist.
• Tool Description: Bash (sandbox — per-command) (52 tks) - Treat each command individually; default to sandbox for future commands.
• Tool Description: Bash (sandbox — response header) (17 tks) - Header for how to respond when seeing sandbox-caused failures.
• Tool Description: Bash (sandbox — retry without sandbox) (33 tks) - Immediately retry with dangerouslyDisableSandbox on sandbox failure.
• Tool Description: Bash (sandbox — tmpdir) (58 tks) - Use $TMPDIR for temporary files in sandbox mode.
• Tool Description: Bash (sleep — keep short) (22 tks) - Bash tool instruction: keep sleep duration to 1-5 seconds.
• Tool Description: Bash (sleep — no polling background tasks) (37 tks) - Bash tool instruction: do not poll background tasks, wait for notification.
• Tool Description: Bash (sleep — run immediately) (21 tks) - Bash tool instruction: do not sleep between commands that can run immediately.
• Tool Description: Bash (sleep — use check commands) (34 tks) - Bash tool instruction: use check commands rather than sleeping when polling.
• Tool Description: Bash (timeout) (83 tks) - Bash tool instruction: optional timeout configuration.
• Tool Description: Bash (verify parent directory) (38 tks) - Bash tool instruction: verify parent directory before creating files.
• Tool Description: Bash (working directory) (37 tks) - Bash tool note about working directory persistence and shell state.
• Tool Description: CronCreate (durability note) (122 tks) - CronCreate insert (shown when durable-cron is enabled) explaining the durable: true vs false trade-off.
• Tool Description: EnterPlanMode (ambiguous tasks) (195 tks) - Tool for entering plan mode when task has ambiguity.
• Tool Description: PowerShell (git guidance) (192 tks) - PowerShell tool guidance to prefer new commits, consider safer alternatives to destructive git operations, and never bypass hooks or signing without an explicit user request.
• Tool Description: SendUserMessage (verbatim) (102 tks) - Describes the concise SendUserMessage tool variant for sending verbatim user-visible messages with normal or proactive status.
• Tool Description: Snooze (delay and reason guidance) (437 tks) - Extends the snooze tool description with guidance on choosing delaySeconds relative to the 5-minute prompt cache TTL and writing informative reason fields.
• Tool Description: TaskList (teammate workflow) (133 tks) - Conditional section appended to TaskList tool description.
• Tool Description: ToolSearch (second part) (0 tks) - The bulk of the tool description.
• Tool Description: WebFetch (concise) (159 tks) - Concise tool description for WebFetch covering URL fetching, private URL limitations, redirects, and caching.
• Tool Description: WebSearch (concise) (88 tks) - Describes the concise WebSearch tool variant with US-only results, current-month guidance, domain filters, and required sources.
• Tool Description: Write (read existing file first) (113 tks) - Tool description for Write in environments where existing files must be read before overwrite.
• Tool Description: request_teach_access (part of teach mode) (139 tks) - Describes a tool that requests permission to guide the user through a task step-by-step using fullscreen tooltip overlays instead of direct access.
• Tool Parameter: Artifact comment actions guidance (511 tks) - Describes Artifact action parameter semantics for reading, replying to, resolving, and paginating comment threads.
• Tool Parameter: Bash run_in_background guidance (92 tks) - Explains Bash run_in_background behavior and that commands do not need a trailing ampersand.
• Tool Parameter: Bash run_in_background note (74 tks) - Notes that Bash commands can use run_in_background when the result is not needed immediately.
• Tool Parameter: Claude in Chrome JavaScript code (103 tks) - Describes the JavaScript code parameter for the Claude in Chrome JavaScript execution tool.
• Tool Parameter: Computer action (251 tks) - Action parameter options for the Chrome browser computer tool.
• Tool Parameter: SendUserMessage attachments (75 tks) - Describes optional SendUserMessage attachments as local file paths or pre-resolved file objects.
• Tool Parameter: matched ask rule (198 tks) - Describes metadata identifying a user-configured permissions.ask rule that forced a tool approval prompt while preserving the tool-authored decision reason.
• Tool Parameter: set_cwd needs_trust directory (197 tks) - Describes the canonical target directory returned by a set_cwd needs_trust response, which the SDK host must show in a trust dialog and echo back verbatim on accept.

Skills

Built-in skill prompts for specialized tasks.

• Skill: /code-review efficiency dimension (106 tks) - Code-review pass that surfaces wasted effort the diff adds — duplicate computation or I/O, avoidable serialization, large scopes held by closures — and points to the cheaper option.
• Skill: /design-sync package source shape (16174 tks) - Shape-specific /design-sync instructions for syncing a React design system from a built package without Storybook.
• Skill: /doctor slash command description (357 tks) - Trigger description for the /doctor slash command covering setup health, unused extensions, memory cleanup, hooks, updates, and permission prompts.
• Skill: /doctor slash command (15359 tks) - Diagnostic workflow for auditing and fixing Claude Code installation health, unused context, local memory duplication, hooks, version currency, and permission prompts.
• Skill: /explain-usage slash command (449 tks) - Analyzes the current session transcript into cost-weighted token usage groups, charts the results, and explains them in plain language.
• Skill: /init CLAUDE.md and skill setup (new version) (7828 tks) - A comprehensive onboarding flow for setting up CLAUDE.md and related skills/hooks in the current repository, including codebase exploration, user interviews, and iterative proposal refinement.
• Skill: /insights report output (182 tks) - Formats and displays the insights usage report results after the user runs the /insights slash command.
• Skill: /loop cloud-first scheduling offer (510 tks) - Decision tree for offering cloud-based scheduling before falling back to local session loops in the /loop command.
• Skill: /loop local runtime note (96 tks) - Conditional /loop confirmation note explaining that local loops run only until the current session closes.
• Skill: /loop self-pacing mode (1141 tks) - Instructs Claude how to self-pace a recurring loop by arming event monitors as primary wake signals and scheduling fallback heartbeat delays between iterations.
• Skill: /loop slash command (dynamic mode) (951 tks) - Parses user input into an interval and prompt for scheduling recurring or dynamically self-paced loop executions.
• Skill: /loop slash command (969 tks) - Parses user input into an interval and prompt, converts the interval to a cron expression, and schedules a recurring task.
• Skill: /stuck (background-daemon diagnostics) (181 tks) - The background-daemon troubleshooting section of the /stuck skill.
• Skill: /stuck slash command (964 tks) - Diagnoses frozen or slow Claude Code sessions.
• Skill: Agent Design Patterns (2901 tks) - Reference guide covering decision heuristics for building agents on the Claude API, including tool surface design, context management, caching strategies, and composing tool calls.
• Skill: Artifact PR review (composed publish flow) (10912 tks) - Skill instructions for gathering a GitHub pull request, authoring a structured review briefing payload, and publishing it through the Artifact tool pr_review input.
• Skill: Artifact PR review description (composed publish flow) (178 tks) - Trigger description for the composed PR review briefing Artifact flow with republish-only updates.
• Skill: Artifact PR review (14867 tks) - Skill instructions for gathering a GitHub pull request, authoring a structured review briefing, optionally wiring a live staleness signal, filling the bundled HTML template, and publishing it as an Artifact.
• Skill: Artifact dashboard (2057 tks) - Instructions for creating dashboard artifacts with KPI tiles, chart specifications, and breakdown tables from the built-in template.
• Skill: Artifact data table (2016 tks) - Skill instructions for creating interactive data-table artifacts with sortable, filterable tabular data, safe JSON embedding, theming, and template-preservation requirements.
• Skill: Artifact design (3584 tks) - Design guidance skill for producing distinctive, polished artifacts by calibrating visual treatment, applying design fundamentals, planning color/type/layout, and avoiding templated AI-generated defaults.
• Skill: Artifact diagramming (1352 tks) - Provides Artifact diagramming guidance, including when diagrams add value and how to build legible theme-aware inline SVG.
• Skill: Artifact document (1785 tks) - Skill instructions for creating live editable document artifacts with structured prose, status metadata, commenting, and template-preservation requirements.
• Skill: Artifact explainer (2024 tks) - Instructions for creating explainer artifacts with numbered-step or section walkthrough structures from the built-in template.
• Skill: Artifact report (1716 tks) - Instructions for creating long-form report artifacts with a masthead, table of contents, structured sections, and optional appendix from the built-in template.
• Skill: Artifact slides (2406 tks) - Skill instructions for creating live editable slide-deck Artifacts with slide-editor navigation, presentation mode, notes, comments, and template-preservation requirements.
• Skill: Artifact spreadsheet (2588 tks) - Skill instructions for creating live editable spreadsheet artifacts with persistable rows, formulas, sorting, comments, and template-preservation requirements.
• Skill: Artifact whiteboard when-to-use guidance (182 tks) - When-to-use guidance for proactively offering a whiteboard during architecture, multi-component planning, or repeated clarification while limiting the offer to once per session.
• Skill: Build with Claude API (reference guide) (1112 tks) - Template for presenting language-specific reference documentation with quick task navigation.
• Skill: Building LLM-powered applications with Claude (28635 tks) - Guides Claude in building LLM-powered applications using the Anthropic SDK, covering language detection, API surface selection (Claude API vs Managed Agents), model defaults, thinking/effort configuration, and language-specific documentation reading.
• Skill: Claude Code configuration guide (1865 tks) - Skill instructions for answering Claude Code configuration questions by checking the running build, bundled references, and current documentation.
• Skill: Code Review (Angle B — removed-behavior auditor) (94 tks) - Code-review finder angle that, for each deleted or rewritten line, names the behavior it guaranteed and confirms the new code still guarantees it.
• Skill: Code Review (Angle C — cross-file tracer) (88 tks) - Code-review finder angle that follows each changed function out to its callers, checking the diff hasn't broken a call-site contract.
• Skill: Code Review (Angle D — language-pitfall specialist) (101 tks) - Code-review finder angle that hunts for the well-known traps of the diff's language or framework.
• Skill: Code Review (Angle E — wrapper/proxy correctness) (126 tks) - Code-review finder angle for wrapping types (caches, proxies, decorators), checking every method forwards faithfully to the wrapped object.
• Skill: Code Review (Output — findings JSON array) (241 tks) - Defines the code-review skill's result shape: a JSON array of findings carrying file, line, summary, and failure_scenario.
• Skill: Code Review (Phase 0 — gather the diff) (135 tks) - Opening step of the code-review skill: assemble the unified diff to review with git diff.
• Skill: Code Review (Phase 2 — verify, 3-state) (125 tks) - Precision-tier verification step: run one verifier per candidate finding, each voting CONFIRMED, PLAUSIBLE, or REFUTED.
• Skill: Code Review (Phase 2 — verify, recall-biased) (137 tks) - Recall-tier verification step: one verifier per candidate finding, biased toward keeping anything plausible.
• Skill: Code Review (Phase 3 — sweep for gaps) (131 tks) - Final code-review sweep: a clean-slate reviewer re-reads the diff to catch defects the earlier passes missed.
• Skill: Code Review (altitude dimension) (61 tks) - Code-review dimension: check whether each change is implemented at the right depth rather than as a fragile special case.
• Skill: Code Review (conventions dimension) (0 tks) - Code-review dimension: flag diff lines that break a rule stated in an applicable CLAUDE.md (user, repo-root, or ancestor-directory), quoting the exact rule and offending line, and emit nothing when no CLAUDE.md governs the change.
• Skill: Code Review correctness finder angles (414 tks) - Shared /code-review finder-angle block covering line-by-line diff scanning, removed-behavior auditing, and cross-file tracing.
• Skill: Code Review inline medium/high template (592 tks) - Template for medium and high inline code-review prompts that run eight finder angles, deduplicate without verification, and enforce a minimum findings target.
• Skill: Code Review inline xhigh mode (1189 tks) - Extra-high inline /code-review prompt that runs ten finder angles, deduplicates without verification, sweeps for gaps, and returns up to fifteen findings.
• Skill: Code Review low effort expanded-findings mode (646 tks) - Low-effort /code-review prompt that reads the diff once, returns up to eight hunk-visible findings, and targets at least min(files_changed, 4) genuine findings.
• Skill: Computer Use MCP (1206 tks) - Instructions for using computer-use MCP tools including tool selection tiers, app access tiers, link safety, and financial action restrictions.
• Skill: Cowork plugin authoring (4791 tks) - Skill instructions for creating or customizing Cowork plugins, including mode selection, research, implementation, packaging, connector replacement, and plugin delivery.
• Skill: Data Visualization description (403 tks) - Trigger description for the Data Visualization skill covering charts, graphs, dashboards, palettes, stat tiles, and related visualization requests.
• Skill: Data Visualization (2904 tks) - Skill instructions for producing accessible, brand-neutral charts, graphs, dashboards, and data visualizations using a validated method.
• Skill: Debugging (417 tks) - Instructions for debugging an issue that the user is encountering in the Claude Code session.
• Skill: Design description (352 tks) - Trigger description for the Design skill, covering editable multi-artboard canvas Artifacts for interfaces, marketing graphics, and print layouts.
• Skill: Design sync Storybook source shape (25255 tks) - Design sync sub-skill instructions for using a repo's Storybook as the fidelity oracle when building, validating, matching, uploading, and re-syncing component previews.
• Skill: Design sync (9610 tks) - Skill for syncing a React design system to claude.ai/design by configuring the target project, running the converter, verifying previews, and uploading verified artifacts.
• Skill: Design (18857 tks) - Skill instructions for creating and publishing multi-artboard Claude Design canvas Artifacts with editable layouts and source-grounded visual recreation rules.
• Skill: Dynamic pacing loop execution (1068 tks) - Step-by-step instructions for executing a dynamic pacing loop that runs tasks, arms persistent monitors for event-gated waits, schedules fallback heartbeat ticks, and handles task notifications.
• Skill: Generate permission allowlist from transcripts (2408 tks) - Analyzes session transcripts to extract frequently used read-only tool-call patterns and adds them to the project's .claude/settings.json permission allowlist to reduce permission prompts.
• Skill: Import to Claude Code (418 tks) - Generated SKILL.md instructing Claude to finish importing leftover foreign-agent config that claude import could not map automatically.
• Skill: Model migration guide (64306 tks) - Step-by-step instructions for migrating existing code to newer Claude models, covering breaking changes, deprecated parameters, per-SDK syntax, prompt-behavior shifts, and migration checklists.
• Skill: Plan Artifact (790 tks) - Skill instructions for creating or customizing shareable plan artifacts from implementation plans, design docs, or RFCs.
• Skill: Plugin eval authoring interview (3003 tks) - Guided interview for creating Claude plugin eval suites under evals/ with gated inputs, graders, calibration, and cost checks.
• Skill: Prompt audit (10988 tks) - Audits prompts, skills, tool descriptions, and request configuration for obsolete model-specific patterns and produces a report plus proposed diff.
• Skill: Prototype description (151 tks) - Trigger description for the Prototype skill, covering working proof-of-concept Artifacts and optional in-place feature demonstrations.
• Skill: Prototype runtime capabilities guidance (242 tks) - Explains when prototype Artifacts should use user-granted runtime capabilities and requires loading the artifact-capabilities skill before relying on live data or actions.
• Skill: Prototype (2643 tks) - Turns a product or UI idea—including an explicitly requested feature shown in an existing app—into a working proof-of-concept Artifact through intake, assumption setting, publication, and feedback iteration.
• Skill: Run CLI tool example (499 tks) - Example file for the Run app skill showing how to document building, invoking, and testing a CLI tool.
• Skill: Run Electron desktop GUI app example (4625 tks) - Example file for the Run app skill showing how to launch an Electron desktop app under xvfb and drive it through a Playwright REPL driver.
• Skill: Run TUI interactive terminal app example (1004 tks) - Example file for the Run app skill showing how to drive an interactive terminal app with tmux, readiness polling, pane capture, key references, and cleanup.
• Skill: Run app (999 tks) - Skill for launching and driving the current project's app through its real runtime surface using project-specific run skills or fallback patterns.
• Skill: Run browser-driven web app example (1408 tks) - Example file for the Run app skill showing how to start a web dev server, drive it with chromium-cli, capture screenshots, and document app-specific gotchas.
• Skill: Run library SDK example (653 tks) - Example file for the Run app skill showing how to document building, testing, and smoke-checking a library or SDK at its public package boundary.
• Skill: Run skill generator (4681 tks) - Skill for authoring or improving a project-specific run skill that documents verified build, launch, runtime driving, and troubleshooting steps.
• Skill: Run skill template (1216 tks) - Template file for the Run skill generator showing the frontmatter and section structure for a project-specific run skill.
• Skill: Run web server API example (1362 tks) - Example file for the Run app skill showing how to document a server or API lifecycle with background launch, readiness checks, curl verification, and shutdown.
• Skill: Schedule recurring cron and run immediately (271 tks) - Converts an interval to a cron expression, schedules a recurring task via the cron creation tool, confirms to the user, and immediately executes the task without waiting for the first cron fire.
• Skill: Setup Cowork role selection (475 tks) - First step of the setup-cowork skill that explains Cowork, asks for the user's role, calls ShowOnboardingRolePicker, or falls back to a plain-text role list.
• Skill: Setup Cowork (3315 tks) - Guided Cowork setup flow that helps the user pick a role, install matching plugins, connect tools, try a skill, configure writing voice, and wrap up.
• Skill: Team onboarding guide (521 tks) - Template for onboarding a new teammate to a team's Claude Code setup, walking them through usage stats, setup checklists, MCP servers, skills, and team tips in a warm conversational style.
• Skill: Update Claude Code Config (1195 tks) - Skill for modifying Claude Code configuration file (settings.json).
• Skill: Update config description (170 tks) - Update-config skill description (settings.json hooks, perms, env).
• Skill: Update config settings file locations (1104 tks) - Where Claude Code stores settings.json across scopes.
• Skill: Verify CLI changes (example for Verify skill) (565 tks) - Example workflow for verifying a CLI change, as part of the Verify skill.
• Skill: Verify server/API changes (example for Verify skill) (612 tks) - Example workflow for verifying a server/API change, as part of the Verify skill.
• Skill: Verify skill (4354 tks) - Skill for opinionated verification workflow for validating code changes.
• Skill: Whiteboard (4533 tks) - Creates a whiteboard Artifact for architecture sketches and planning feedback using a freehand canvas.
• Skill: update-config (7-step verification flow) (1160 tks) - A skill that guides Claude through a 7-step process to construct and verify hooks for Claude Code, ensuring they work correctly in the user's specific project environment.