Three tools with mixed quality. read_me and restore_checkpoint have adequate descriptions but minimal schemas. create_view has a detailed description and partial schema (elements array documented, but element object structure not formally defined). No parameter descriptions for any tool inputs. No error handling guidance. No output schemas documented. Naming is reasonable (verb_noun pattern) but schemas lack rigor expected for production tools.

• Add parameter descriptions to all tools. For create_view, document: 'elements: Array of Excalidraw element objects (type, id, x, y, width, height required; see read_me for full format). checkpoint_id: Optional string identifier for saving diagram state; must be unique per session.'
• Define formal JSON Schema for the 'elements' array. Create a reusable schema object documenting element types (rectangle, ellipse, diamond, text, arrow, cameraUpdate, deleteElement, restoreCheckpoint) with required and optional fields for each.
• Document output schemas. Specify: read_me returns {content: string}; create_view returns {success: boolean, streamId?: string, elementCount: number}; restore_checkpoint returns {elements: array, viewport?: object}.
• Add error handling guidance. E.g., 'If checkpoint_id not found, returns error with available checkpoint IDs. If elements array is malformed, returns validation error with the first invalid element index.'
• Reduce description length for read_me from current ~200 chars to 80-120 chars. Current description is too long and mixes instruction ('Do NOT call it again') with function description. Separate concerns: description explains what it does; usage pattern is enforced server-side.