# cMCP: Deny AI Agent Tool Calls with Signed Receipts

A developer introduced cMCP (via Hacker News), a tool that lets users block an AI agent's tool call and generate a cryptographically signed receipt of the denial. This provides an audit trail to support accountability and governance when overseeing autonomous AI agent actions. As AI agents gain broader access to systems, such tools address the rising need for verifiable oversight and compliance.

**Importance:** 3/5

## Sources

### Technology
- [Hacker News](https://github.com/agentrust-io/cmcp) — Tue, 04 Aug 2026 18:06:08 +0000