Two tools with minimal but present descriptions and basic schemas. add_note has a single string parameter with description; read_notes has no parameters. Both descriptions are under 100 chars and lack context on when to use each tool or what happens on error. No output schemas documented. No error handling guidance. No parameter constraints or validation hints. Naming is clear (verb_noun pattern) but descriptions are sparse. Missing idempotency guidance for add_note (write operation). No mention of file-based state or persistence model.

• Document output schemas for both tools. add_note should return {success: boolean, message: string}; read_notes should return {notes: string[], count: number}.
• Expand add_note description to: 'Add a new note to the notes file. This operation is idempotent, calling with the same message multiple times appends it each time. Returns success status and confirmation message.'
• Add error handling: catch file I/O exceptions and return actionable errors like 'Failed to write note: disk full' or 'Failed to read notes: file corrupted. Try clearing notes.txt.'
• Add parameter validation: reject empty or excessively long messages (e.g., max 10,000 chars) with clear error messages.
• Migrate from STDIO to HTTP or SSE transport to enable remote access and integration with hosted MCP clients.