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

With no annotations provided, the description carries the behavioral burden. It usefully discloses that this is a GET operation and that it retrieves cost/trace data, marking it as read-only in spirit. However, it omits details like authentication requirements, error behavior, rate limits, or how the trace data is returned.

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?

One dense sentence conveys the endpoint, resource, and purpose. No filler or redundant restatement, and the essential action is front-loaded.

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 one-parameter GET tool with no output schema, the description plus schema are mostly sufficient. It states what the operation returns (cost/trace), identifies how to locate the prior request via support_reference, and the GET method implies a safe read. Minor gaps remain around usage context and response format, but the low complexity reduces the need for more.

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?

Schema coverage is 100%, so the schema already documents support_reference as a UUID from a prior call. The tool description adds little beyond placing the parameter in the URL path, so the baseline score of 3 applies.

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 names the exact HTTP verb and resource, and states the specific outcome: recovering cost/trace for a prior request. This clearly distinguishes it from siblings like get_models or get_generation_status, which target different resources or purposes.

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?

Use is only implied by the phrase 'prior request' and the support_reference parameter. There is no explicit guidance on when to choose this over sibling tools, no prerequisites, and no mention of invalid use cases.

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