Platform Availability

Which features work on which provider platform. This table is the single source of truth in this skill — per-feature sections elsewhere point here instead of restating availability. When writing code for a third-party platform (Bedrock, Vertex, Foundry) or Claude Platform on AWS, check this table first; a feature not supported there means use the first-party Claude API surface or a different approach.

Columns: 1P = first-party Claude API, P-AWS = Claude Platform on AWS (Anthropic-operated, same-day parity), Bedrock = Amazon Bedrock, Vertex = Google Cloud Vertex AI, Foundry = Microsoft Foundry. ✅ = GA, β = beta, ❌ = not supported.

Feature	1P	P-AWS	Bedrock	Vertex	Foundry	Notes
Messages, streaming, tool use	✅	✅	✅	✅	✅	Core API
PDF input	✅	✅	✅	✅	β
Structured outputs / strict tool use	✅	✅	✅	✅	β
Adaptive thinking / effort	✅	✅	✅	✅	β
Extended thinking	✅	✅	✅	✅	β
Prompt caching (5m, 1h)	✅	✅	✅	✅	β
Automatic prompt caching	✅	✅	❌	❌	β
Token counting	✅	✅	✅	✅	β
Citations	✅	✅	✅	✅	β
Search results content blocks	✅	✅	✅	✅	β
Fine-grained tool streaming	✅	✅	✅	✅	✅
Compaction	β	β	β	β	β
Context editing	β	β	β	β	β
Context windows (1M)	✅	✅	✅	✅	β
inference_geo (data residency)	✅	✅	❌	❌	❌
Server-side tools
Web search	✅	✅	❌	✅	β	Vertex: basic web_search_20250305 only (no _20260209 dynamic filtering)
Web fetch	✅	✅	❌	❌	β
Code execution	✅	✅	❌	❌	β
Tool search	✅	✅	✅	✅	β	Bedrock: InvokeModel API only, not Converse
Advisor tool	β	β	❌	❌	❌
Client-implemented tools
Bash, text editor, memory	✅	✅	✅	✅	β
Computer use	β	β	β	β	β
Agentic / orchestration
Agent Skills (Messages API)	β	β	❌	❌	β
Programmatic tool calling	✅	✅	❌	❌	β
MCP connector	β	β	❌	❌	β
Managed Agents	β	β	❌	❌	❌	Foundry ❌ inferred (not in Foundry docs either way)
Self-hosted sandboxes	β	β	❌	❌	❌	P-AWS: GET /v1/environments/{id}/work list endpoint not supported; other work endpoints OK
API endpoints
Message Batches	✅	✅	❌	❌	❌
Files API	β	β	❌	❌	β
Models API	✅	✅	❌	❌	❌
Other
Mid-conversation system messages	✅	✅	❌	❌	❌	{{OPUS_NAME}}, {{PREV_OPUS_NAME}}, {{FABLE_NAME}}, {{MYTHOS_NAME}}; not {{SONNET_NAME}}
Fast mode	β	❌	❌	❌	❌	Research preview, beta fast-mode-2026-02-01, first-party API only
Cache diagnostics	β	❌	❌	❌	❌	First-party API only
Task budgets	β	β	❌	❌	❌	Beta header task-budgets-2026-03-13; 3P availability not documented — assume unsupported