Single tool with adequate naming and description, but critical gaps in schema completeness, parameter documentation, output specification, and error handling. The tool name 'get_ui_feedback' follows verb_noun convention and clearly signals a read operation. Description is 229 characters, within the 10-1024 baseline range, but lacks key details about when to call the tool and what prerequisites exist. Input schema is present but empty (no parameters), this is valid for a parameterless tool. However, the output schema is NOT formally documented in the tool definition; output structure can only be inferred from the handler code. No parameter descriptions exist (vacuous, since there are none). Error handling is minimal: a single text fallback when no feedback exists, but no guidance on recovery actions. No tool annotations (readOnlyHint, idempotentHint, etc.). The implementation reads from an in-memory store and clears state after each call, making it non-idempotent on re-invocation, a significant concern for agent retry safety. Response structure is reasonable (mixed text and image content) but not formally specified in the MCP schema.

• Add an 'outputSchema' field to the tool definition documenting the structure of returned content. Example: { type: 'object', properties: { content: { type: 'array', items: { oneOf: [ { type: 'object', properties: { type: { const: 'text' }, text: { type: 'string' } } }, { type: 'object', properties: { type: { const: 'image' }, data: { type: 'string' }, mimeType: { type: 'string' } } } ] } } }
• Refactor the tool to NOT call clearFeedback() after returning results. Instead, store feedback in a database or persistent queue with a read-once flag. This ensures the tool returns the same result on retry, maintaining idempotency.
• Add a 'readOnlyHint': true annotation to the tool definition to signal that it is safe for LLMs to call without side effects (once idempotency is fixed).
• Enhance the error response when no feedback exists. Instead of a bare message, return: { type: 'text', text: 'No feedback submitted yet. The user must: 1) Open their dev site in Chrome, 2) Click the UI Annotator extension, 3) Add annotation pins, 4) Click Send to Claude. Ask the user to complete these steps.' } This provides actionable recovery guidance.
• Expand the tool description to include: (a) WHEN to call it, 'Call this when the user indicates they have submitted feedback via the Chrome extension'; (b) PREREQUISITES, 'Requires the Chrome extension to be active on a dev site'; (c) SIDE EFFECTS, 'After successful retrieval, stored feedback is cleared; subsequent calls return no-feedback error until new annotations are submitted.'