Toolkit provides 8 well-scoped tools with complete JSON Schema input definitions and descriptions. Naming follows verb_noun convention (travel_hotspot_rank, tc3_sign, text_chunk, date_calc, sqlite_query, webpage_extract, jwt_decode, health_ping). All tools have descriptions (avg ~150 chars, within 10-1024 baseline). Schemas are properly typed with required fields and descriptions. However, output schemas are not documented, LLMs cannot predict response structure. Error handling is minimal; no recovery guidance or categorization. No tool annotations (readOnlyHint, destructiveHint). Parameter descriptions lack format constraints (e.g., 'YYYY-MM-DD' for dates is stated but not formalized). Security: tc3_sign accepts secretId/secretKey as parameters (anti-pattern; should use env-var injection only). webpage_extract lacks timeout validation. Overall solid foundation but missing LLM-critical output documentation and error guidance.

• Document output schema for every tool. Add a 'returns' section to each tool description or a separate schema field. Example: travel_hotspot_rank returns {locations: [{id, name, rank, score, topAdvantages: [string]}], totalCount: number}.
• Remove secretId and secretKey from tc3_sign parameters. Require TC3_SECRET_ID and TC3_SECRET_KEY environment variables only. Update description to state 'Credentials read from environment; do not pass as parameters.'
• Add readOnlyHint: true to all 8 tool definitions in the registration code (src/tools/index.ts or individual tool files). This signals to agents that these tools are safe to call without confirmation.
• Enhance error messages with recovery guidance. E.g., in date_calc, catch invalid dates and return 'Invalid date format. Use YYYY-MM-DD (e.g., 2024-01-15). Received: {input}.' In webpage_extract, catch timeouts and suggest 'Timeout after {ms}ms. Try increasing timeoutMs or checking if the URL is reachable.'
• Add JSON Schema format and bounds constraints. E.g., date_calc 'date' param: add 'format': 'date' to schema. webpage_extract 'timeoutMs': add 'minimum': 1000, 'maximum': 60000 to schema. Update descriptions to reference these constraints.