Carrick

Carrick

TypeScript codebase intelligence for AI agents & IDEs.

Coding agents working across full-stack and multi-service codebases routinely rebuild existing helpers, trust stale type definitions, and modify API contracts without knowing who consumes them.

Carrick solves this by indexing your entire TypeScript ecosystem, from frontend apps to backend services, whether they live in a monorepo or across multiple repositories. By integrating deeply with the TypeScript compiler, Carrick traces every route, type, and cross-service call while recording function behaviour—so agents search by intent rather than name and stay grounded in your real architecture.

Delivered via MCP for AI agents and LSP for IDEs, Carrick ensures models see existing endpoints and utilities before generating new code. The scanner is source-available, runs from your CLI or CI pipeline, and includes a Free plan so you can start building safer agent workflows immediately.

Get started

npm install -g carrick

carrick init

carrick init signs you in, connects your agent and downloads your index. The quick start has the details (Node 24 or newer).

One index, three surfaces

Search existing code through your agent, inspect live contracts in your editor, and catch breaking changes in your pull requests.

In your agent

Give your AI assistants complete context on what already exists, how endpoints are shaped, and who breaks if something changes. Carrick maps every function by what it actually does, allowing agents to find existing implementations and build on them—even in repositories you haven't checked out locally. Endpoint types are pulled straight from the TypeScript compiler in the service that exposes them.

Works with any MCP-compatible agent, including Claude Code, Cursor, Windsurf, and Codex.

In your editor

Inspect cross-service contracts and jump between connected files without leaving your IDE. "Go to Definition" jumps directly from a service call to its handler when the code is on disk, while Code Lens displays every caller across your local index inline. If a frontend call and backend handler fall out of sync, Carrick surfaces type mismatches as native editor diagnostics.

Available on the Visual Studio Marketplace and Open VSX, or runnable as a standard LSP server.

In your pull request

Bring the exact same index into CI to catch contract risks, duplicate work, and silent version drift. When a producer and consumer fall out of sync—regardless of protocol—Carrick flags the exact mismatch directly on your PR before it merges. It also checks dependency versions across services to catch conflicting package updates early.

Skills

Carrick ships with four skills for the most common agent failures — breaking a caller in another service, rebuilding existing code, trusting a stale copy of another service's type, and missing places in a codebase-wide change. Each skill gets its answer from the Carrick index. carrick init installs them into .claude/skills/ and .agents/skills/.

Ask your agent

• "Which functions handle webhook signing across our services?"
• "Where do we deduplicate users by email?"
• "What calls /api/users, and what response shape does each caller expect?"
• "Show me every function that retries on rate-limit errors."

MCP tools

The MCP endpoint exposes the index as structured tools your agent can call directly. The MCP tools reference lists each tool's parameters and response.

Keep the index current

The GitHub Action refreshes each repository's part of the index on every push to main. It runs read-only in CI, with no API key to store.

name: Carrick

on: push: branches: [main] pull_request: branches: [main] permissions: id-token: write contents: read jobs: carrick: runs-on: ubuntu-latest steps:

• uses: actions/checkout@v4 with: fetch-depth: 0
• uses: carrick-tools/carrick@v1

Building the index has the full workflow, with on-demand rescans, dependency installs and monorepo setup.

Docs

• How Carrick works
• What Carrick covers
• carrick.json
• CLI
• MCP tools
• Task skills
• In your editor
• PR comments

Licence

Carrick has a free tier, and paid plans are on the pricing page. The scanner in this repository is source-available under the Elastic License 2.0. Copyright (c) 2026 Far Harbour B.V.

Development

See AGENTS.md for build, test, and contribution conventions.

cargo test

cargo fmt cargo clippy

Install the optional pre-commit hook to run formatting and tests before each commit:

./scripts/install-hooks.sh