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

The annotations already declare readOnlyHint=true, so the description doesn't need to restate this. It adds the REST endpoint and optional window filtering, which are useful behavioral details. However, it doesn't disclose pagination or response format, which are common for list operations.

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 extremely concise, using just three short sentences to cover purpose, REST endpoint, and optional parameters. Every sentence earns its place with no redundancy or fluff.

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 simple read-only list tool with two optional parameters, the description covers the core operation. However, the lack of an output schema means the description could have mentioned return value or pagination behavior, which are not addressed. This leaves a minor but notable gap.

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 provides 100% coverage with descriptions for both parameters ('End of the calendar events window' and 'Start of the calendar events window'). The description adds minimal extra meaning beyond 'optional start/end window', so the baseline of 3 is appropriate.

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 clearly states 'List calendar events' with a specific verb and resource, and adds the REST endpoint for precision. It is unambiguous and distinguishes itself from sibling tools like reclaim_list_tasks, which focus on different entities.

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?

The description indicates usage by stating its function as listing calendar events and notes the optional start/end window for filtering. There are no explicit exclusions or alternatives, but the context is clear enough given the sibling tool set.

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