trust-gate-mcp

Trust Gate MCP

Post-quantum, tamper-evident receipts for consequential agent actions, as an MCP server.

Four tools, one shared signing primitive (the open-source OpenAgentOntology mint_receipt: Ed25519 + ML-DSA-65 + SLH-DSA):

Tool What it does mint_receipt_for_record_change Mints a post-quantum receipt for a CRM record change. Works with any CRM (open-core Relaticle, hosted CRMs via their own MCP, custom). Old/new values are SHA-256 hashes. audit_my_agent_inventory Ranks a CALLER-PROVIDED list of MCP tools by worst-regret if they act. Read-only. Cannot auto-discover other servers -- MCP protocol does not allow that. mint_action_receipt Post-quantum receipt for any consequential agent action. verify_receipt Verify a receipt from the certificate alone -- offline, no DB. Defaults to PQ-required mode.

Quantum Hardening (pol.must_do.150 reference implementation)

• H1 key persistence + bootstrap with FAIL-CLOSED kid-drift check

• H2 per-IP token-bucket rate limit (DoS-hardened: FIFO eviction + body cap)

• H3 PQ-required verify (defeats signature-stripping downgrade attacks)

• H4 128-bit kid on every minted receipt (offline same-notary check)

• Optional bearer-auth toggle + narrowed CORS via TRUST_GATE_BEARER_TOKEN + TRUST_GATE_ALLOWED_ORIGINS

• 33/33 tests including adversarial PQ-strip + IP-rotation attack simulations

See PUBLISH.md for the full hardening status table.

Local dev (stdio)

pip install mcp "openagentontology[pq]" python server.py

Container deploy (Smithery / any container host)

docker build -t trust-gate-mcp . docker run -p 8081:8081 -v trust-gate-data:/data/oao trust-gate-mcp

The volume mount on /data/oao is required for production -- without it the signing key rotates per restart and breaks long-running verification chains. The persistent key_metadata.json holds the notary's kid; the bootstrap step refuses to start if it drifts.

License

Apache-2.0. Built on the open-source OpenAgentOntology primitive.