Modula Relay demonstrates solid definition quality with complete input schemas, clear descriptions, and thoughtful tool annotations. All 6 tools have explicit JSON Schema definitions with proper type constraints (min/max lengths, enums via Zod). Descriptions are substantive (ROSTER: 54 chars, DISPATCH: 73 chars, AWAIT: 380 chars, within the 10-1024 baseline). Tool annotations (readOnlyHint, destructiveHint, openWorldHint) are correctly applied and documented in code comments. However, output schemas are not formally documented, responses use a text wrapper with structuredContent but no schema declaration. Parameter descriptions are present but terse (e.g., 'Peer name or session id' lacks format guidance). Error handling is implicit (adapter methods) rather than explicit in tool definitions. No recovery guidance in descriptions.

• Add formal output schema declarations to each tool registration. Document the structure of structuredContent (e.g., for relay_roster: {project: string, agents: Array<{name: string, status: string}>}).
• Enhance parameter descriptions with format examples and validation rules. E.g., 'msg_id: Unique message correlation ID (alphanumeric, 1-128 chars, e.g., msg_abc123)' instead of just 'Message correlation id (min 1, max 128 chars)'.
• Add error classification and recovery guidance to tool descriptions. E.g., 'relay_dispatch: Returns {receipt: {state: "undeliverable"}} if target peer not found, retry relay_roster to refresh peer list.'
• Document response_schema parameter format in relay_dispatch. Specify that it must be valid JSON Schema or provide an enum of supported schema patterns.
• Include timeout and retry semantics in relay_await description. E.g., 'Timeout after 30 seconds; peers=0 on first timeout may indicate registration in progress, retry once more before reporting empty pool.'