Agent Receipts MCP server

agent-receipts

Prove what your AI agents did.

On August 2, 2026, the EU AI Act's record-keeping obligations for high-risk AI systems became enforceable: automatic event logging (Article 12), deployer log retention of at least six months (Article 26), and penalties up to €15M or 3% of global turnover. The question your auditor, regulator, or counterparty will ask is simple:

"Your AI agent approved this. Prove exactly what it did — and prove nobody edited the record."

An ordinary log file can't answer that: whoever owns the log can edit it. agent-receipts gives every consequential agent action a cryptographically signed, timestamped receipt that anyone can verify offline — and exports signed audit bundles you can hand directly to a compliance officer.

What a receipt proves

and verification fails

• What happened, when — action type, summary, actor, principal, ISO 8601 timestamp
• It hasn't been altered — Ed25519 signature over canonical JSON; change one character

vault; every audit export automatically flags gaps (deletions) and chain breaks

• Nothing was deleted — receipts are hash-chained with monotonic sequence numbers per

and immediately discarded, never stored or transmitted

• Without exposing your data — hash-only privacy: payloads are SHA-256 fingerprinted

Built for the audit conversation

exportauditbundle produces what compliance actually needs: all receipts in a date range, a tamper-evidence report (sequence gaps, chain breaks), the signing public key, and a manifest signature over the whole bundle. Retention is yours to control — the vault is a local SQLite file you keep as long as Article 26 (or your policy) requires.

You don't have to trust us. Receipts verify offline against a pinned public key with the bundled CLI — no account, no network call, no dependence on this service existing tomorrow. That's what makes the evidence durable.

Quick start (MCP — local, free)

// Claude Desktop / Claude Code / any MCP client
{
  "mcpServers": {
    "agent-receipts": {
      "command": "npx",
      "args": ["-y", "agent-receipts-mcp"],
      "env": { "AGENT_RECEIPTS_DATA": "<where-to-keep-the-vault>" }
    }
  }
}

Requires Node.js >= 22.13 (uses the built-in node:sqlite — zero native dependencies). Prefer one-click? Grab the .mcpb bundle from Releases and open it with Claude Desktop.

Quick start (HTTP API)

npm install && npm run build
npm run serve        # http://localhost:8787

# 1. Create a vault (returns your API key — shown once)
curl -X POST localhost:8787/v1/vaults -d '{"name":"acme-compliance"}'

# 2. Issue a receipt after an agent action
curl -X POST localhost:8787/v1/receipts \
  -H "Authorization: Bearer ark_..." \
  -d '{"action_type":"invoice.approved","summary":"Approved INV-1042 for EUR 1,250",
       "payload":{"invoice":"INV-1042","amount":1250},"actor":"agent:ap-bot@acme"}'

# 3. Anyone can verify — no auth
curl -X POST localhost:8787/v1/verify -d '{"receipt":{...}}'

# 4. Export a signed audit bundle for the compliance officer
curl "localhost:8787/v1/export?from=2026-01-01" -H "Authorization: Bearer ark_..."

Service manifest for machine discovery: GET /.well-known/agent-receipts.json.

Offline verification

Shortened. The full README is on GitHub.