Crush

Charmbracelet's Crush TUI coding agent.

• Source: src/providers/crush.ts
• Loading: lazy (src/providers/index.ts). Lazy because Crush ships per-project SQLite databases and we use node:sqlite to read them.
• Test: tests/providers/crush.test.ts (10 tests, fixture-based)

Where it reads from

Crush keeps a global registry that lists every project it has touched, and a separate SQLite database per project.

File	Path
Registry (project list)	$CRUSH_GLOBAL_DATA/projects.json, otherwise $XDG_DATA_HOME/crush/projects.json, otherwise ~/.local/share/crush/projects.json (Linux/macOS) or %LOCALAPPDATA%/crush/projects.json (Windows).
Per-project db	<project.path>/<project.data_dir>/crush.db where data_dir defaults to .crush.

The registry shape is an object keyed by project id (modern Crush) or an array (older builds and tokscale's sample fixtures). The parser accepts both.

Storage format

SQLite. Schema verified against charmbracelet/crush v0.66.1 (internal/db/migrations/20250424200609_initial.sql plus subsequent additive migrations).

Two tables matter for codeburn:

CREATE TABLE sessions (
  id TEXT PRIMARY KEY,
  parent_session_id TEXT,
  title TEXT NOT NULL,
  message_count INTEGER NOT NULL DEFAULT 0,
  prompt_tokens INTEGER NOT NULL DEFAULT 0,
  completion_tokens INTEGER NOT NULL DEFAULT 0,
  cost REAL NOT NULL DEFAULT 0.0,
  updated_at INTEGER NOT NULL,
  created_at INTEGER NOT NULL,
  ...
);

CREATE TABLE messages (
  id TEXT PRIMARY KEY,
  session_id TEXT NOT NULL,
  role TEXT NOT NULL,
  parts TEXT NOT NULL DEFAULT '[]',
  model TEXT,
  created_at INTEGER NOT NULL,
  updated_at INTEGER NOT NULL,
  ...
);

Caching

None at the provider level.

Deduplication

Per crush:<sessionId> (crush.ts).

What we extract

codeburn field	Crush source
inputTokens	sessions.prompt_tokens
outputTokens	sessions.completion_tokens
costUSD	sessions.cost (already in dollars)
model	dominant value of messages.model for the session, picked by GROUP BY model ORDER BY COUNT(*) DESC LIMIT 1. Falls back to unknown.
timestamp	sessions.updated_at if set, otherwise created_at

Cache tokens, reasoning tokens, web-search counts, tools, and bash commands are all left as zero / empty. Crush does not record per-message token data, so per-turn attribution is not available.

Quirks worth knowing

• Timestamps are seconds, not milliseconds. The Crush schema comments in the upstream migration claim millisecond timestamps, but every actual INSERT/UPDATE in internal/db/sql/{sessions,messages}.sql uses strftime('%s', 'now'), which returns Unix seconds. The parser multiplies by 1000 before constructing a Date. Tokscale's parser (junhoyeo/tokscale#346) gets this wrong and is off by 1000x. Confirmed against Crush v0.66.1.
• Cost is stored in dollars as a REAL. No conversion needed.
• Child sessions are skipped. Only rows with parent_session_id IS NULL are surfaced. Crush sub-agents inherit cost into the parent.
• Zero-spend rows are filtered. Discovery skips sessions with cost = 0 AND prompt_tokens = 0 AND completion_tokens = 0.
• Optimize detectors that depend on tools (detectJunkReads, detectDuplicateReads, detectLowReadEditRatio) will not flag Crush sessions. That is correct: Crush does not log per-tool calls in a way we can read today.
• detectLowWorthSessions may flag Crush sessions because it looks for cost without edits. That is a known false positive; if it becomes noisy, we can branch the detector on provider.

When fixing a bug here

1. Confirm the issue against a real Crush install (brew install charmbracelet/tap/crush) before assuming the schema has changed. Migrations in the last six months have only added columns to sessions/messages, never removed any of the ones we read.
2. If the bug is "Crush sessions show timestamps from 1970-something", check whether someone "fixed" the seconds-vs-milliseconds handling by removing the * 1000. The schema comment is wrong; the data is in seconds.
3. If the bug is "Crush model column shows unknown", the session has no messages with a non-null model. Some early Crush builds did not record provider on every message; add LIKE matching against provider if you want a stronger fallback.
4. If the bug is "no sessions discovered", the registry path probably has not been verified for the user's setup. Print getRegistryPath() and have them confirm the file exists at that location.
5. New fixtures go under the inline schema in tests/providers/crush.test.ts; keep the CREATE TABLE literal and synchronized with the upstream migration.