chancery

The identity provider for AI agents. Every agent gets its own identity, authority that can only narrow when delegated, revocation that lands on its next action, and an audit trail it cannot write to.

Self-hosted. Single Go binary. Apache-2.0. chanceryai.vercel.app

Why

Agents usually run on a shared API key, so you can't revoke one without breaking the rest and can't attribute an action to a specific agent. A prompt injection then isn't bad output — it drives every tool that key can reach. And the logs come from the agent itself, the one component you stopped trusting the moment it was compromised.

Chancery moves all three outside the agent: identity it doesn't mint, authority it can't widen, and a record it can't write.

Install

brew install chanceryhq/tap/chancery          # macOS / Linux
# or: docker run --rm -v chancery:/data ghcr.io/chanceryhq/chancery --help
# or: go build -o chancery ./cmd/chancery

Binaries are cosign-signed (keyless, GitHub OIDC) and ship an SBOM.

Try it

chancery init --trust-domain acme.com
chancery agent register deploy-bot --owner user:you@acme.com --purpose "deploys services"
chancery writ grant --for user:you@acme.com --to deploy-bot --cap "call:github/get_*" --ttl 8h

# run a real MCP server behind the gate, with a sealed token
chancery secret put github-token --from-file ./token
chancery mcp wrap --agent deploy-bot --writ <writ-id> \
    --secret GITHUB_TOKEN=github-token -- npx @acme/github-mcp
#   get_pull_request → ALLOW      forwarded, attributed, recorded
#   delete_repo      → DENY       never reaches the server

chancery writ revoke <writ-id>    # the agent's NEXT call fails, mid-session
chancery audit                    # the timeline; `audit verify` checks the chain

Full walkthrough: QUICKSTART · try every feature in order: testing playbook.

What it does

• Identity — agent → immutable content-addressed version → revocable running instance, each separately killable, all owner-attributed.
• Writs — authority as a signed chain that can only add restrictions. Widening isn't forbidden, it's unrepresentable: the delegation block format has no field for it.
• In-path enforcement — mcp wrap decides every tool call against fresh state, filters tools/list, and answers denials in-protocol. A prompt-injected agent can't talk its way around an out-of-process proxy.
• Sealed credentials — injected into the tool server's environment, never the agent's context.
• Runtime spawn — orchestrators mint governed workers without an admin token, bounded by a human-approved template.
• Callee trust — the server's code identity is pinned (image digest, install tree, or binary) and re-verified before every spawn; drift refuses to start. --confine adds an egress allow-list and read-only filesystem as an OS boundary, and --run-as gives the server its own UID so injected secrets aren't readable by anything sharing yours.
• Per-call semantics — task-bound grants, a veto-only socket for your own intent checker, and short-lived leases a cooperating server verifies right before it commits.
• Evidence — hash-chained and metadata-only by schema: prompts, payloads, and arguments have nowhere to be stored. Plus a read-only dashboard at /ui.

MCP-first, not MCP-only. Identity, writs, policy, credentials, and audit govern any agent in any language today via the decision API — see governing any agent. What's MCP-specific is the unbypassable enforcement; HTTP, shell, and browser PEPs follow, with the same writs.

Docs

Examples: Claude Code / MCP clients · browser agents · LangGraph · Perseus Vault · Go SDK

Status

Beta. All 19 design RFCs are locked and implemented; 109 tests across 11 packages gate every commit. The security model is settled and every known gap is published in SECURITY.md with an owner and a phase. The CLI and REST surfaces may still take breaking changes before 1.0, always noted in the changelog.

Two promises (RFC-011): what ships open source stays Apache-2.0 — no license flip, ever — and security is never paywalled; every gap in that table closes in the open core.

Contributing

make build && make test    # Go 1.26+, no CGO; go vet + 109 tests in seconds
make demo                  # the 60-second enforcement + audit arc

CONTRIBUTING.md has the repo layout, how tests map to each RFC, and how to propose changes. Found a hole? Please open an issue — that's worth more to me than a star.