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LangGraph agent with MCP server integration for Google Analytics 4 real-time reporting, supporting both Gemini and OpenAI LLMs
Single tool with significant gaps. Tool name 'get_realtime_report' follows verb_noun convention (+), but description is minimal (34 chars, below 50-char baseline for clarity). Input schema present but incomplete: 'metrics' and 'dimensions' are typed as 'list' with no item type specification, violating JSON Schema best practices. Parameter descriptions exist but lack constraints (e.g., no enum for metrics, no format guidance). Output schema entirely undocumented, LLM cannot predict return structure. No error handling guidance. Tool lacks idempotency hints, permission scopes, or rate-limit warnings despite calling external Google Analytics API.
Returns real-time data from Google Analytics 4.
Output schema completely undocumented. LLM cannot predict return type, structure, or fields. Violates pattern:tool requirement that all tools document return types.
Parameter 'metrics' and 'dimensions' typed as bare 'list' with no item type. Should be 'array' with 'items' schema specifying string enum of valid metric/dimension names (e.g., activeUsers, screenPageViews, city, browser).
Tool description is 34 characters ('Returns real-time data from Google Analytics 4.'), below 50-char minimum for LLM clarity. Missing WHEN to use, WHAT it returns, and prerequisites (e.g., 'Requires valid GA4 property_id and authenticated credentials').
No error handling guidance. Tool calls external Google Analytics API but provides no recovery hints for common failures (invalid property_id, auth failure, rate limits, malformed metrics). LLM cannot self-correct.
Inferred effective spec: <=2025-11-25.
| Scored | Grade | Overall | Spec posture | Rubric |
|---|---|---|---|---|
| 2026-09-23 | F | 45 | <=2025-11-25 | v2 |
Credentials hardcoded in server initialization via environment variable. While not exposed as tool parameter (good), no audit trail, permission scopes, or rate-limit enforcement documented. Tool lacks scope declaration (e.g., 'read:analytics').