Agent Relay defines 4 tools with reasonable naming (verb_noun pattern) and documented schemas. However, descriptions are inconsistent in depth, parameter descriptions lack detail on constraints and formats, and output schemas are not documented. relay_respond and relay_send have good parameter coverage with enums and constraints, but relay_inbox and relay_sent lack specificity on return structure. Error handling guidance is absent across all tools. The server uses HTTP transport and integrates with MCP SDK 1.30.0, but lacks modern spec features like tool annotations and structured error recovery patterns.

• Document output schemas for all tools. For relay_inbox and relay_sent, define the structure of exchange items returned: {id, type, subject, body, status, created_at, from_human_id, to_human_id, ...}. Include field types and which are always present.
• Enhance parameter descriptions with format constraints. Change 'limit' to 'Maximum number of items to return (type: number, range 1-50, default 20)'. Add enum values for 'statuses': 'Filter by status: pending, responded, declined, acknowledged'.
• Add error handling guidance to each tool. Document expected errors (e.g., 'exchange_id not found', 'permission denied', 'invalid action for current status') and recovery steps. Example: 'If exchange_id not found, call relay_inbox() to list available exchanges.'
• Clarify relay_respond parameter dependencies. Update description: 'body is required when action=respond, optional for decline/acknowledge. If omitted for respond, the tool will return an error: Invalid request: body required for respond action.'
• Document relay_send idempotency. Add to description: 'Idempotent: repeated calls with the same request_id return the same exchange_id without creating duplicates. Omit request_id for non-idempotent sends.'

Inferred effective spec: <=2025-11-25.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry