Subscribe to Events

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations indicate readOnlyHint: true and destructiveHint: false, which align with monitoring. The description adds minimal behavioral context beyond stating it starts monitoring. It does not explain the subscription model or whether it blocks, returns streaming, or requires cleanup.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single truncated sentence, which is concise but incomplete. It conveys the core idea without extraneous text, but the truncation undermines completeness.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a subscription tool, the description lacks critical context: how to end the subscription, whether it is one-shot or persistent, and what output format to expect. Given no output schema and simple annotations, the description should cover these operational details.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The input schema has zero parameters with 100% coverage, so the baseline score of 3 applies. The description adds no parameter information, but none is needed given the empty schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description 'Start real-time monitoring of Apple data changes: calendar, reminders, clipbo...' is truncated but conveys the core purpose of subscribing to event changes. The tool name and title reinforce this, and sibling tools include no other subscribe tool, so it is somewhat distinct. However, the truncation reduces clarity.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is provided on when to use this tool versus alternatives like directly reading events or setting up triggers. There is no mention of prerequisites, lifecycle (how to stop), or context for subscription usage.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.