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

Annotations already declare readOnly, idempotent, non-destructive, and non-open-world, so the safety bar is covered. The description adds real value beyond that: the URL is shareable by anyone holding it (a security property), it is stable/'fixed', it stays valid during continuation or failure, and it flags the XLSX-vs-CSV formula-interpretation risk.

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?

Three tight sentences, front-loaded with the core action and follow-on caveats that each carry information. No filler; slightly dense but every sentence earns its place.

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?

With annotations covering the safety profile and no output schema needed, the description is nearly complete for a two-parameter fetch tool. The only omission is any characterization of the job_no identifier, which is likely self-evident but undocumented.

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 description coverage is 0%, so the description must compensate. It does add meaningful semantics for the format parameter (CSV/XLSX behavioral differences), but the required job_no parameter is never explained in either the schema or the description, leaving a gap.

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?

States a specific verb and resource: 'Get a shareable fixed CSV/XLSX URL for your job.' An agent can distinguish this download-URL tool from metadata siblings like get_export_job without opening a schema. It stops short of naming a sibling explicitly, so it does not reach a 5.

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?

Usage is implied by 'for your job' and the note that the URL works 'while a continuation runs or fails,' which tells the agent the result is fetchable across job states. However, it never states when to prefer this over get_export_job, list_export_jobs, or resume_export_job, leaving routing to inference.

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