Single tool 'verify_action' has a well-structured schema with all required parameters typed and described. Tool name is clear and action-oriented (verify_*). Description is comprehensive (194 chars) and explains the purpose, when to use it, and what it returns. Input schema includes claim, evidence, kind, context, and caller_context with proper type definitions and descriptions. However, output schema is not explicitly documented in the visible code, the description mentions 'verdict, reasoning, confidence, verifier_used, receipt' but no formal JSON Schema for the response is shown. Error handling guidance is minimal. The tool is READ_ONLY (good security posture) but lacks explicit error recovery patterns.

• Document the complete output schema as JSON Schema. Include all fields in 'receipt' (SHA-256 hashes, verifier_id, kid, verdict, timestamp, etc.) with types and descriptions.
• Add explicit error handling: define error codes (e.g., 'invalid_claim_format', 'evidence_contradicts_claim', 'insufficient_evidence') and pair each with recovery guidance ('Try reformulating the claim as...' or 'Provide additional evidence from...').
• Convert 'kind' parameter to an enum: kind: {type: 'string', enum: ['code_diff', 'db_op', 'file_op', 'api_call', 'generic'], description: '...'}.
• Document input constraints: maximum claim length, evidence object depth/size limits, and what happens if limits are exceeded (truncation vs rejection).
• Add companion tools or endpoints for audit/retrieval: get_receipt(receipt_id), list_verifications(filters), revoke_receipt(receipt_id) to enable multi-step workflows and receipt lifecycle management.