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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It does add one valuable behavioral trait: that it grants no room membership, which prevents misuse. However, it does not disclose whether the request is idempotent (despite the idempotencyKey parameter), whether it is a write operation, or what the response or side effects are. Given the lack of annotations, this is only partially transparent, so a mid-range score is warranted.

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 two short sentences, with the core purpose front-loaded and the behavioral caveat placed second. Every word contributes meaning, and there is no filler or redundancy. This is an ideal length for a simple request tool.

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?

This is a tool with three required parameters, no annotations, no output schema, and zero schema description coverage. The description is insufficient for an agent to call it correctly: it does not explain the meaning of 'idempotencyKey' or the interplay of 'id' and 'round,' nor does it mention whether the request is asynchronous, requires approval, or returns a reference. Given the low support from structural fields, the description should compensate but does not, leaving the tool under-specified.

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 0% description coverage, so the description must clarify the parameters. It mentions 'case round,' which loosely implies the 'round' parameter refers to a round, but it does not explain that 'id' is the case identifier, the meaning of 'round,' or the purpose of 'idempotencyKey.' The description adds almost no semantic value beyond the parameter names, leaving the agent to guess the contract. This is a significant gap given the lack of schema descriptions.

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 the verb 'request' and the object 'evidence access' for a 'particular case round,' which is specific and distinguishes it from siblings like grant_case_access and list_case_access_requests. The added detail 'This grants no room membership' further differentiates the tool's exact scope. This is a precise, unambiguous statement of purpose.

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 provides a clarifying constraint ('This grants no room membership') but lacks explicit guidance on when to use this tool versus alternatives like grant_case_access or list_case_access_requests. It does not name the sibling tools or give scenarios where this should be preferred. The usage context is implied rather than stated, and no exclusions are given.

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