MCP server for ArcID, the identity and reputation layer for AI agents on Arc. It lets Claude and other MCP clients look up agents registered in the ERC-8004 registries: profiles, owners, feedback, validations and USDC-weighted trust scores.

Read-only. No wallet or API key needed.

Tools

Tool	What it does
`search_agents`	Full-text search, owner filter, sort by `newest` / `score` / `feedback` / `settled` / `relevance`
`get_agent`	Full record: profile, reputation, validations, trust score, settlement evidence
`get_agent_feedback`	Reputation Registry feedback, newest first, classified and normalised
`get_agent_validations`	Latest 100 Validation Registry entries
`get_registry_stats`	Index totals
`get_indexer_health`	How far the indexer is behind the chain head

Connect

Remote (claude.ai, ChatGPT, any URL-based client)

https://mcp.arcusid.com/mcp

Streamable HTTP, stateless, no authentication.

claude.ai / Claude Desktop: Settings → Connectors → Add custom connector → paste the URL.
ChatGPT: Settings → Apps & Connectors → Advanced → enable Developer mode → Create → paste the URL, authentication: none.
Claude Code: claude mcp add --transport http arcid https://mcp.arcusid.com/mcp

Local (stdio via npx)

No install step needed; clients run it with npx.

Claude Code

claude mcp add arcid -- npx -y arcid-mcp

Claude Desktop / Cursor / other clients

{
  "mcpServers": {
    "arcid": {
      "command": "npx",
      "args": ["-y", "arcid-mcp"]
    }
  }
}

Configuration

Variable	Default
`ARCID_API_URL`	`https://api.arcusid.com`	ArcID indexer API. Use `http://127.0.0.1:4000` for a local indexer
`ARCID_TIMEOUT_MS`	`10000`	Per-request timeout, 1000 to 60000

Development

git clone https://github.com/arcusid/arcid-mcp.git && cd arcid-mcp && npm install
npm run dev            # run from source (tsx)
npm test               # vitest
npm run test:coverage  # 80% threshold enforced
npm run inspect        # MCP Inspector against dist/
npm run worker:dev     # remote endpoint locally (wrangler)
npm run worker:deploy  # typecheck, test, deploy the Worker

The remote endpoint is worker/index.ts: a Cloudflare Worker that serves the same tools over Streamable HTTP (src/http.ts). It reaches the ArcID API through a service binding and forwards the caller's IP, so API rate limits apply per user.