signed-audit-trails-recipe
Signed Audit Trails for Claude Code Tool Calls
Cookbook-style walkthrough for cryptographically signed receipts on every
Claude Code tool call. This is the teaching skill. For the runtime
implementation, install the protect-mcp plugin.
What this gives you
Every tool call (Bash, Edit, Write, WebFetch) is:
- Evaluated against a Cedar policy before execution. If the policy denies the call, the tool does not run.
- Signed as an Ed25519 receipt after execution. Receipts are JCS-canonical, hash-chained, and verifiable offline by anyone with the public key.
An auditor, regulator, or counterparty can verify the full chain later with a
single CLI command (npx @veritasacta/verify receipts/*.json). No network
call, no vendor lookup, no trust in the operator.
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