Single tool with critical gaps. Tool name 'toss_coin' lacks action verb prefix (should be 'flip_coin' or 'get_coin_flip'). Description is adequate (56 chars, within 10-1024 range) but generic. Input schema is empty object {} with no parameters documented. No output schema documented, LLMs cannot predict return structure. Annotations present but incomplete (idempotentHint=false is incorrect for a pure function). No error handling, no recovery guidance. Tool is trivial but violates multiple baseline patterns.

• Rename tool from 'toss_coin' to 'flip_coin' to start with action verb and match LLM naming conventions (90% of A+ tools start with action verb).
• Document output schema explicitly: { type: 'object', properties: { content: { type: 'array', items: { type: 'object', properties: { type: { type: 'string', enum: ['text'] }, text: { type: 'string', enum: ['heads', 'tails'] } } } } } }
• Correct idempotentHint to true, coin flip is a pure function with no side effects and is safe to retry.
• Add explicit input schema with type and properties, even if empty: { type: 'object', properties: {}, required: [] }
• Expand description to 100-150 chars explaining when to use (e.g., 'Flip a coin to make a random binary decision. Returns either heads or tails with equal probability. Useful for random selection, tie-breaking, or testing randomness.').