coldstart CLAUDE.md

coldstart-mcp

Lightweight navigation layer for AI agents. Answers one question: which files are relevant to this task? Fast static index over file paths, symbol names, and exports — queried via two operations, find (ranked file paths matched against declared names: filenames, path segments, exported symbols, plus a repo-wide grep-recall pass) and gs (for a single file: top-level symbols with per-symbol cross-file callers, 1-hop internal imports, reverse importers, and a "Edited together" section derived from git history — files that keep changing in the same commits, which is a habit and NOT a dependency edge, rendered in EVERY view because narrowing asks for less of the file rather than fewer channels; view: "full" is the default and returns all of it in one call). Both are exposed two ways with identical output: as CLI commands (coldstart find / coldstart gs) for shell-capable agents — the primary path — and as MCP tools (find / gs) for no-shell clients like Claude Desktop.

Architecture — one keeper, thin readers. The query surfaces are stateless readers over an on-disk cache; a single background keeper process keeps that cache fresh. It does NOT serve queries.

• Keeper (coldstart --daemon, src/index.ts runKeeper + src/index-manager.ts): watches the repo, patches/rebuilds the index, debounce-saves it to the disk cache. Lazy-spawned by the first reader (src/keeper.ts ensureKeeper); logs to ~/.coldstart/daemon/<root>.log; exits when its lockfile is removed, a foreign pid takes over the lock, or its own entry binary disappears (watchOwnBinary in src/daemon-lock.ts — a 15 s poll, two consecutive misses, so a keeper self-reaps within ~30 s of an npm uninstall/moved install, the only shutdown path once the CLI is gone). The lock carries pid/rootDir/version (no port — it serves nothing).
• CLI readers (coldstart find/gs, src/cli.ts): load the cache under a load profile, run the same engine, print, exit. They ensureKeeper so uncommitted edits stay live. Readers NEVER build: cache miss → wait for the keeper's first save (180 s); git-HEAD drift → wait for its reconcile re-save (12 s); in-process build only on the no-keeper fallback.
• MCP reader (default invocation, src/server/mcp.ts + src/index.ts makeCacheReader): a long-lived stdio server that reads the keeper's cache and mtime-reloads when it changes. The keeper is the single freshness authority; the server has no watcher of its own.

Freshness (no TTL — deleted in v18). Validity = CACHE_VERSION + git HEAD + reconcile + live watcher. At keeper start, src/indexer/reconcile.ts stat-walks every indexed file against its [mtimeMs,size] fingerprint (stamped in baseIndexedFile) + git-diffs against the indexed HEAD, then patches exactly the changed set (branch switch = ~3 s patch, was a full rebuild). After every patch, src/indexer/invariants.ts lints the index (violation → auto-rebuild); after every save, a rotating 50-file fingerprint audit re-patches watcher-missed drift. keeper-state.json (last reconcile/patch/rebuild/save) + repair.jsonl (failures) sit beside the cache; status renders both. The keeper watches its own lockfile with pid-ownership + a 30 s poll backstop (foreign pid → exit).

find speed: the repo-wide reference scan resolves a real ripgrep (src/server/searcher.ts: COLDSTART_RG → PATH → bundled @vscode/ripgrep → editor-app copies; winner persisted in ~/.coldstart/searcher.json), falling back to git grep → grep → Node scan.

For Rails repos: the Ruby parser emits synthetic edges for has_many/belongs_to/has_one/has_and_belongs_to_many (gated to app/models/), parses config/routes.rb resources, and adds bidirectional controller↔views edges. Polymorphic associations and gem-backed models stay unresolved (runtime DSL).

Index pipeline: walk → parse (Tree-sitter via web-tree-sitter (WASM) — the native node-tree-sitter engine was dropped in #68; all 15 grammars are inert .wasm vendored in vendor/wasm/, loaded once by ensureParsersReady() in src/indexer/parser.ts, no per-grammar peer-dep / node-gyp / install scripts → plain npm i for TS/JS/JSX/TSX/Java/Ruby/Python/Go/Rust/C#/PHP/Kotlin/C++/YAML/TOML/XML/Groovy; SFC script blocks extracted from Vue/Svelte/Astro before TS parsing; GraphQL/.env/AngularJS 1.x via regex extractors; Swift/Dart not indexed) → resolve imports → build graph (including cross-file call edge resolution) → save cache. Behaviour is byte-identical to the old native engine (proven with natives pruned) and 1.3–3.6× faster through the walk-heavy extract phase.