# AnchorRegistry

> On-chain provenance lookup for AnchorRegistry. Resolve AR-IDs, hashes, and full trees. Authless.

- **Type:** MCP server
- **Install:** `agentstack add mcp-anchorregistry-ar-mcp`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [AnchorRegistry](https://agentstack.voostack.com/s/anchorregistry)
- **Installs:** 0
- **Category:** [Integrations](https://agentstack.voostack.com/c/integrations)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [AnchorRegistry](https://github.com/AnchorRegistry)
- **Source:** https://github.com/AnchorRegistry/ar-mcp

## Install

```sh
agentstack add mcp-anchorregistry-ar-mcp
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# ar-mcp

The AnchorRegistry MCP server. Resolve any AR-ID, manifest hash, or
provenance tree from any MCP-compatible AI client.

[](LICENSE)
[](https://modelcontextprotocol.io)
[](https://workers.cloudflare.com)
[](https://smithery.ai/servers/ic3moore/anchorregistry)
[](https://arxiv.org/abs/2604.03434)

Endpoint: `https://mcp.anchorregistry.ai/mcp`

## Install

### Claude Desktop
Settings → Integrations → Add server.
URL: `https://mcp.anchorregistry.ai/mcp`

### Claude Code
```bash
claude mcp add --transport http anchorregistry https://mcp.anchorregistry.ai/mcp
```

### Cursor
Settings → MCP → Add new MCP server.
Name: `anchorregistry` · Type: `http` · URL: `https://mcp.anchorregistry.ai/mcp`

## Tools

### `ar_verify_arid`
Resolves an AR-ID to its full provenance record.

> "What's at AR-2026-qnPOJ1z?"

### `ar_verify_by_hash`
Resolves an artifact by SHA-256 manifest hash.

### `ar_resolve_tree`
Returns the full provenance tree for any AR-ID.

## How it works

`ar-mcp` is a thin proxy. Every tool call hits `api.anchorregistry.ai`
and returns the JSON unchanged. No data is logged, no credentials are
stored, no state is held between requests.

The full surface is documented at:
- https://anchorregistry.ai/llms.txt
- https://anchorregistry.ai/agents.json
- https://api.anchorregistry.ai/openapi.json

## Roadmap

v0.2 will add `ar_check_balance` and `ar_register_artifact` once the MCP
credential-handling pattern stabilizes across clients. `ar_seal_tree` is
deferred indefinitely (irreversible action; needs robust user-confirmation
primitives the protocol does not yet provide). The deferred tools are
fully implemented and live in [`src/future-tools.ts`](src/future-tools.ts) —
enabling them is a one-line flip per tool.

## Develop

```bash
npm install
npm test           # vitest, hits live api.anchorregistry.ai
npm run type-check
npm run dev        # wrangler dev — http://localhost:8787
npm run deploy     # wrangler deploy
```

Verify locally with the MCP inspector:
```bash
npx @modelcontextprotocol/inspector http://localhost:8787/mcp
```

## License

MIT.

## See also

- AnchorRegistry: https://anchorregistry.com
- Python SDK: https://pypi.org/project/anchorregistry/
- Source: https://github.com/AnchorRegistry/ar-mcp
- Spec: https://anchorregistry.ai/agents.json
- Contracts: https://github.com/AnchorRegistry/ar-contracts-v1

## Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [AnchorRegistry](https://github.com/AnchorRegistry)
- **Source:** [AnchorRegistry/ar-mcp](https://github.com/AnchorRegistry/ar-mcp)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/mcp-anchorregistry-ar-mcp
- Seller: https://agentstack.voostack.com/s/anchorregistry
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.