Single tool with bare-minimum definition. The notify_user tool has a clear action verb in its name and a reasonable description (92 chars), but lacks critical depth in parameter guidance and output schema documentation. The tool description states WHAT it does but not WHEN to use it or HOW the agent should interpret success. Parameters are typed (both strings) but lack format/constraint guidance, taskTitle and taskSummary accept unbounded strings with no length limits, validation rules, or examples of valid inputs. The response schema is implicit (returns text on success, text+isError on failure) but never formally documented. Error handling returns the exception message to the LLM, which is helpful, but does not guide recovery actions. No indication of retry safety, idempotency, or side effects. Overall, this is a functional but minimal tool definition typical of community servers.

• Add explicit output schema to the tool description: 'Returns {content: [{type: "text", text: string}], isError?: boolean}. On success, isError is omitted or false. On failure, isError is true and text describes the error.'
• Specify string length limits for parameters: 'taskTitle (1 - 256 chars): Brief status or title describing the task. Examples: "Data export complete", "Error in payment processing". taskSummary (1 - 2000 chars): Detailed summary of the task outcome, status, or error. Include relevant metrics or error details.'
• Clarify the tool's purpose and side effects in the description: 'Sends a POST notification to ntfy.sh. This is a one-way broadcast operation, the agent should not rely on user acknowledgment. Verify NTFY_TOPIC is configured before use.'
• Add error classification and recovery guidance: 'On HTTP errors (4xx/5xx), the tool returns isError:true with the HTTP status. Agent should check: 401/403 (auth failure, verify NTFY_TOPIC), 404 (topic not found, verify spelling), 5xx (service down, retry after delay). On network timeout, retry is safe; this operation is idempotent.'
• Document the NTFY_TOPIC environment variable requirement in a README or server startup message: 'NTFY_TOPIC is required. Set it in .env or as an environment variable before starting the server. Example: NTFY_TOPIC=my-alerts.'
• Consider adding a second tool like 'test_notification' that validates connectivity and NTFY_TOPIC configuration without sending a real notification to the user. This helps agents self-diagnose setup issues.