GitPin

Pin agent answers to Git HEAD. Path. Line. Full SHA. Prove. Verify.

GitPin is not another “repo context” MCP. That category is full of vector indexes, dump files, and remote GitHub browsers. GitPin is a trust product: index-free, read-only, multi-repo evidence agents must prove and humans can re-check with git show.

Agent claim
    → pin.search_*   (candidates only)
    → pin.prove      (evidence pack: path + line + full SHA + content hash)
    → pin.verify     (git show re-check; HEAD match report)
    → you run: git show <sha>:<path>

Formerly @shmindmaster/gitpin (0.3.x). See migration.

Release: @shmindmaster/gitpin@0.4.0. Install: npx -y @shmindmaster/gitpin@latest. Node 20+.

Five-minute path

# From a committed Git repository
npx -y @shmindmaster/gitpin@latest init --client codex

init creates ~/.gitpin/repositories.yaml outside the repo, runs doctor, prints a first evidence line with full SHA, and paste-ready MCP config. It never edits the indexed repository.

# Independently verify any claim (same contract as pin.verify)
npx -y @shmindmaster/gitpin@latest verify \
  --repository my-service \
  --path docs/architecture.md \
  --line 42 \
  --sha <full-or-short-hex>

Related MCP server: repo-context

Product job

When agents invent file contents, mix dirty worktrees, or cite the wrong branch
You want every fact re-checkable with git show <sha>:<path>
GitPin registers local Git roots, serves HEAD-only docs/code, flags stale tracked docs, returns path / line / SHA, and closes the loop with pin.verify.

Agent tool surface (pin.*) — 12 read-only tools

Resource: gitpin://catalog. Prompt: prove-with-git-head (forces the product loop).
Cite formats: docs/cite-spec.md. Agent skill template: templates/gitpin-skill.md.

Functionality that is the pivot (not a rename)

• Evidence pack (pin.prove): claim binding, line slice, full SHA, contentSha256, citation.cite / handle, next-step verify.

• Multi-cite sets (pin.prove_set / pin.verify_set): stable evidenceSetId for multi-repo answers and CI.

• Verification report (pin.verify / CLI): independent git show; optional mustContain claim-text; status includes contradicted.

• Candidates, not claims: search returns kind: evidence-candidates with forced next: pin.prove.

• EvidenceBrief: multi-repo knownFacts / gaps / stable evidenceSetId (schema v2).

• Dirty exclusion: uncommitted work is never cited as HEAD evidence.

Explicit non-goals

• Semantic / embedding search

• Writing, committing, or pushing

• Replacing GitHub Issues/PRs automation

• Indexing non-Git umbrella folders as one “repo”

Configuration

Default registry: ~/.gitpin/repositories.yaml (falls back to ~/.repocontext/... if present).

Docs

Tools · Compare · FAQ · Migration · Clients · Architecture · Competitive landscape

Site: shmindmaster.github.io/gitpin (GitHub path may stay repocontext; product name is GitPin).

Development

corepack enable
pnpm install --frozen-lockfile
pnpm validate
pnpm build
pnpm verify:package
pnpm site:test

License

MIT