GroundAPI MCP server demonstrates solid definition quality with 11 well-named, action-oriented tools covering finance, info, and life domains. All tools have descriptions (avg 150 chars) and input schemas with typed parameters. However, output schemas are undocumented, LLMs cannot predict response structure for downstream chaining. Parameter descriptions are present but inconsistent in depth; some lack constraints (e.g., 'limit' params missing min/max bounds). Error handling is basic (ToolError wrapping) without recovery guidance. Tool names follow verb_noun convention well (finance_stock, info_search). No tool annotations (readOnlyHint, destructiveHint) despite all being read-only operations.

• Document output schema for each tool. Example: 'Returns {symbol: string, price: float, change_pct: float, timestamp: ISO8601}'. This enables LLMs to extract fields and chain calls.
• Add explicit min/max bounds to all numeric parameters in descriptions. E.g., 'limit (1-50, default 10)', 'days (1-500, default 60)', 'pe_min (0-100)'.
• Convert 'aspects' and 'scope' parameter descriptions to JSON Schema enums. Replace prose lists with formal enum constraints so LLMs pick from valid options only.
• Add readOnlyHint=true to all tool definitions via fastmcp annotations. This signals that tools are safe to retry and have no side effects.
• Enhance error messages with recovery guidance. When symbol not found, return: 'Symbol "INVALID" not found. Try finance_search(q="company name") to find the correct code.'

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

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