feat: ctx-ignore setup + enforce in fs tools#36
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- Generated .contextignore / .claudeignore / .cursorignore via `ctx-ignore scan` (github.com/arniesaha/ctx-ignore) - Added `npm run ctx-ignore` script for regeneration - New src/tools/ignore.ts: walk-up loader + isIgnored/filterIgnored helpers, cached per root, with MAX_IGNORE_CONTEXT=false escape hatch - read_file returns an "(ignored)" stub instead of dumping huge files (node_modules, build artifacts, binaries) - list_files filters ignored entries and reports hidden count - Kept test files and package-lock.json OUT of the patched .gitignore (ctx-ignore's default patches those, but they belong in git) Part of the context-optimization series addressing yesterday's Claude subscription quota exhaustion. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
.contextignore,.claudeignore,.cursorignorenpm run ctx-ignorefor regenerationread_file/list_files— so the agent stops accidentally slurpingnode_modules, build artifacts, or huge binary files into its own context windowMAX_IGNORE_CONTEXT=falseescape hatch for debuggingWhy
Part of the context-optimization series addressing yesterday's Claude subscription quota exhaustion. A single bot call to
read_file package-lock.jsonorlist_files node_modules/can dump tens of thousands of tokens into history that are re-sent on every subsequent tool iteration.Scan reported a 99.9% reduction in theoretical scan surface (69.7M → 62.8K tokens).
Kept
*.test.tsandpackage-lock.jsonout of the gitignore patch — tests document behavior and lockfiles belong in git; they're ignored only for AI-context purposes.Test plan
npm test— all 76 tests pass, 4 new ignore tests addednpm run build— cleanread_file package-lock.jsonreturns "(ignored by .contextignore)"list_files .shows filtered output with hidden count🤖 Generated with Claude Code