feature_slice
The whole feature
Every file a change touches, by layer, with why.
v2.0 · OPEN SOURCE · 100% OFFLINE
Stop grepping.
Give your agent the whole feature.
One MCP call hands Claude Code, Cursor or VS Code the page, API, route, data model, auth checks and tests behind any feature.
84%
right file in the top 5
3.7×
fewer tokens than grep
83%
of a feature in one call
50 ms
search on 10,000 files
HOW IT WORKS
One call. Every layer.
Your agent asks once. It gets back every file the change touches, in order, with proof.
01 · YOU ASK
“Change how API keys are revoked.”
02 · AGENT CALLS
feature_slice({ feature: "api key revocation" })
03 · GETS BACK
- UI
app/settings/keys/page.tsx:24calls revokeKey - CLIENT
lib/api/keys.ts:41DELETE /api/keys/:id - ROUTE
app/api/keys/[id]/route.ts:12handles the request - AUTH
lib/auth/scopes.ts:8requireScope('keys:delete') - DATA
prisma/schema.prisma:57model ApiKey - TESTS
tests/keys.test.tsnpx vitest run
Illustrative example. Links come from real call sites, requests and ORM calls, each with file:line.
EIGHT TOOLS
Built for the moments agents get lost
trace_flow
How it runs
Entry point to database, with evidence.
impact
What breaks
Dependents and the exact tests to run.
review_diff
Check before commit
Secrets, broken imports, drift. SARIF ready.
api_map
Who can call it
Auth, scopes and roles for every route.
search
Code first
Ranked snippets. Optional local neural model.
SEE IT
Ask once.
Ask once.
Get the map.
The same tools your agent calls over MCP, from your terminal.
$ cb-trainer slice "article comments"
🧩 Feature slice: "article comments" (16 files, ~5,334 / 6,000 tokens)
[server]
src/app/routes/article/article.controller.ts — search match
src/app/routes/article/article.service.ts — search match
src/app/routes/article/comment.model.ts — search match
src/app/routes/profile/profile.utils.ts — favoriteArticle uses profileMapper
[data]
src/prisma/schema.prisma — search match
Flows:
routes.ts → articlesController → addComment → HttpException
MEASURED, NOT CLAIMED
Against grep, on real apps
CLAUDE CODECURSORVS CODEWINDSURFNEXT.JSEXPRESSNESTJStRPCPRISMADRIZZLETYPEORM
CLAUDE CODECURSORVS CODEWINDSURFNEXT.JSEXPRESSNESTJStRPCPRISMADRIZZLETYPEORM