HMAC-attested receipts for AI agent tool calls — verify-action-mcp

What I built (in one paragraph) verify-action-mcp is a small third-party HTTP service. You POST a (claim, evidence) pair from an AI agent, you get back a verdict and an HMAC-attested receipt. Cross-vendor (MCP-compatible — Claude Code, Cursor, Cline, Codex pick it up as a tool). Pure Python stdlib, no pip install, MIT-licensed. Live at verify.armadalab.dev . The pattern it catches If you've built anything with an AI agent harness, you've seen this: "I deleted user 12345" — but the row count didn