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AnchorRegistry

Official registry Other

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

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http anchorregistry 'https://mcp.anchorregistry.ai/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "anchorregistry": {
            "type": "http",
            "url": "https://mcp.anchorregistry.ai/mcp"
        }
    }
}
Remote (sse)
Claude Code 
claude mcp add --transport sse anchorregistry 'https://mcp.anchorregistry.ai/sse'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "anchorregistry": {
            "type": "sse",
            "url": "https://mcp.anchorregistry.ai/sse"
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. ar-mcp
  2. Install
  3. Tools
  4. How it works
  5. Roadmap
  6. Develop
  7. License
  8. See also

ar-mcp

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

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

Install

Claude Desktop

Settings → Integrations → Add server. URL: https://mcp.anchorregistry.ai/mcp

Claude Code
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:

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 — enabling them is a one-line flip per tool.

Develop

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:

npx @modelcontextprotocol/inspector http://localhost:8787/mcp

License

MIT.

See also

Frequently asked questions

What is AnchorRegistry?

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

How do I install AnchorRegistry?

It runs as a remote server. In Claude Code: claude mcp add --transport http anchorregistry 'https://mcp.anchorregistry.ai/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does AnchorRegistry need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is AnchorRegistry open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains AnchorRegistry?

It is published by anchorregistry. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.