Project Memory MCP demonstrates solid tool design with clear naming conventions (verb_noun pattern), comprehensive parameter descriptions, and well-structured schemas using Zod. All 6 tools have explicit descriptions and input schemas. However, output schemas are not formally documented in the code, and error handling lacks recovery guidance. The write tool (append_to_memory) includes a closed enum to prevent drift, showing thoughtful API design. Tool descriptions average ~180 chars, within the 10-1024 baseline. Parameter descriptions are consistently present and specific. Main gaps: no documented output schemas, limited error recovery guidance, and missing tool annotations (readOnlyHint/destructiveHint).

• Document output schemas formally (e.g., in JSDoc or TypeScript interfaces). Specify fields returned by each tool so LLMs can plan downstream calls. Example: get_project_context should document {name, description, languages, structure, gitMetadata}.
• Add error handling with recovery guidance. Wrap tool implementations in try-catch blocks that return structured errors: {error: string, code: 'NOT_FOUND'|'INVALID_INPUT'|'PERMISSION_DENIED', suggestion: string}. Example: 'MEMORY.md not found in /path/to/project. Create one with: echo "# Open questions\n\n# Next steps" > MEMORY.md'
• Implement tool annotations in Zod schemas. Add .meta() or custom fields to mark read vs write tools. Example: inputSchema.meta({readOnlyHint: true}) for get_* tools; {destructiveHint: true} for append_to_memory.
• Enhance path parameter documentation. Explicitly state: 'If omitted, uses the active project set by set_active_project. If no active project is set, returns error: ACTIVE_PROJECT_NOT_SET.'
• Add dry-run support to append_to_memory. Accept optional dryRun: boolean parameter. When true, return preview of changes without writing. Helps LLM verify intent before commit.