Evermint

Tamper-evident receipts for AI agent actions. The notary layer for agent-to-agent transactions.

Install

npm install -g evermint-mcp

Claude Desktop config

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "evermint": {
      "command": "evermint-mcp",
      "env": {
        "EVERMINT_API_KEY": "EVR-sk_your_key_here"
      }
    }
  }
}

Get an API key at https://evermint.app/api-keys

2. Add to your Claude desktop config (~/.claude/claude_desktop_config.json):

{
  "mcpServers": {
    "evermint": {
      "command": "npx",
      "args": ["-y", "evermint-mcp"],
      "env": {
        "EVERMINT_API_KEY": "EVR-sk_your_key_here"
      }
    }
  }
}

3. Restart Claude. The tools appear automatically.

Tools

evermint_mint (API key required)

Mint a tamper-evident, cryptographically timestamped record of an action.

evermint_mint({
  agent_id: "billing-agent-1",
  action_type: "decision_made",
  payload: { decision: "approved", confidence: 0.97 }
})

evermint_verify (public)

Verify a single record by Record ID.

evermint_verify({ record_id: "EVR-12C5N1A2" })

evermint_list_records (API key required)

List records for the authenticated org with optional filters. Returns metadata only (no payloads).

evermint_list_records({
  agent_id: "billing-agent-1",
  action_type: "decision_made",
  since: "2026-01-01T00:00:00Z",
  until: "2026-05-01T00:00:00Z",
  limit: 50
})

All filters are optional. limit defaults to 50 (max 200).

evermint_get_record (API key required)

Fetch the full contents of a single record, including its original payload. Returns 403 if the record exists but belongs to a different organization.

evermint_get_record({ record_id: "EVR-12C5N1A2" })

evermint_verify_chain (public)

Verify a sequence of hash-chained records. Confirms each hash matches its content, and each chain_link correctly references the prior record.

// Explicit list, oldest first
evermint_verify_chain({
  record_ids: ["EVR-AAAAAAAA", "EVR-BBBBBBBB", "EVR-CCCCCCCC"]
})

// Or walk forward from a starting point
evermint_verify_chain({
  start_record_id: "EVR-AAAAAAAA",
  length: 10
})

Returns per-record hash_valid, chain_link_valid, plus an overall chain_intact: true|false.

Verify any record

evermint.app/verify?id=EVR-XXXXXXXX

Publishing

To publish to npm as evermint-mcp:

• package.json name: "evermint-mcp"
• bin entry: { "evermint-mcp": "./dist/server.js" }
• Add to Anthropic MCP registry at modelcontextprotocol.io/registry

Contact

[email protected]