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

Annotations already declare readOnlyHint=true, and the description adds two useful behavioral facts: an API key is required, and results are only available once the job completes. That conditional-result behavior is genuinely beyond the structured data, though failure modes (invalid/expired job_id) are not covered.

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?

Two short sentences, front-loaded with the purpose and return payload, followed by the auth prerequisite. Every clause earns its place with no redundancy.

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 read-only status/results tool with no output schema, the description covers the return payload and the auth requirement. It omits polling guidance and not-found behavior, which are minor for an agent already holding a job_id.

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 0%, so the single job_id parameter carries no structured documentation. The description partially compensates by stating the job is looked up 'by its job_id', clarifying its role, but adds no format, source, or example for the identifier.

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 (get) and resource (bulk job), and enumerates what is returned: status, progress, and results when complete. It is clearly a single-job lookup, distinguishable from list_bulk_jobs, though it does not name that sibling explicitly.

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 implies you need a job_id but gives no guidance on when to use this versus list_bulk_jobs (all jobs) or cancel_bulk_job. There is no mention of polling behavior or what to do while the job is still running.

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