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AnchorRegistry

by io.github.AnchorRegistry

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

Power your agent

Add this server

The publisher's own URL. Not a PlugMCP endpoint.

Server URL
https://mcp.anchorregistry.ai/mcp
Provider
Add in Claude

Claude opens with the name and URL filled in. You still confirm it there.

Claude Code
claude mcp add --transport http io.github.anchorregistry-ar-mcp https://mcp.anchorregistry.ai/mcp

Run in a terminal.

Claude Desktop
{
  "mcpServers": {
    "io.github.anchorregistry-ar-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "https://mcp.anchorregistry.ai/mcp"
      ]
    }
  }
}

claude_desktop_config.json

Step-by-step: add this in Claude

Remote URL or a command on your machine? How the two installs differ

Run on PlugMCP

Host a copy with our keys and logs.

A new server you create. It is not this listing's official endpoint. Use the publisher install when you want their URL and their credentials.

Launch

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Questions

How do I install AnchorRegistry?
Copy the http config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.
Does AnchorRegistry need an API key?
No required environment variable is listed on this record.
What transport does AnchorRegistry use?
AnchorRegistry is reached over HTTP.
When was AnchorRegistry last checked?
Last checked 2026-10-16. On-chain provenance lookup for AnchorRegistry. Resolve AR-IDs, hashes, and full trees. Authless.

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

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:

  • 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 — 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

  • 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
How do I install AnchorRegistry?
Copy the http config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.
Does AnchorRegistry need an API key?
No required environment variable is listed on this record.
What transport does AnchorRegistry use?
AnchorRegistry is reached over HTTP.
When was AnchorRegistry last checked?
Last checked 2026-10-16. On-chain provenance lookup for AnchorRegistry. Resolve AR-IDs, hashes, and full trees. Authless.

No tool list yet. Remote servers get one after the first health check.

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