Three tools with basic schemas and descriptions, but significant gaps in parameter documentation and output schema clarity. Tool names follow verb_noun convention (echo, health, whoami) but descriptions are minimal (10-50 chars, below the 50-200 char baseline for LLM optimization). All tools lack documented output schemas, critical for agent planning. Parameters present but descriptions are sparse or missing entirely. No error handling guidance. Schema completeness is moderate; input types are declared but parameter descriptions are insufficient.

• Expand tool descriptions to 50-200 characters. Example: 'Echo back a message with optional uppercase transformation. Use to test message handling or transform user input. Returns the echoed message and transformation applied.'
• Document output schemas for all tools. Specify: echo returns {message: string, transformed: boolean}; health returns {uptime: number, runtime: string, ...}; whoami returns {user_id: string, email: string, ...}.
• Add parameter descriptions for 'message' (e.g., 'Plain text message to echo back, max 1000 chars') and 'uppercase' (e.g., 'If true, convert message to uppercase before returning').
• Add error handling guidance: 'If message exceeds 1000 chars, returns 400 with message: "Message too long. Max 1000 chars."' Enables LLM self-correction.
• Clarify whoami output: 'Returns the authenticated user identity resolved from the current session. Includes user_id, email, and display_name. Call this first to verify authentication before accessing user-specific resources.'