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

The description explicitly discloses a side effect: 'This changes job and credit records' with a one-time failure marking and credit refund for jobs stuck past ten minutes. The annotations declare readOnlyHint=true, which directly contradicts a tool that writes to job and credit records (destructiveHint=true on a read-only tool is likewise incoherent). Per the rubric this is a mutation disclosed against a readOnly annotation.

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 primary outcome (status + output URLs), followed by exactly the two behavioral facts an agent needs: the ten-minute failure/refund rule and the mutation disclaimer. No padding.

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?

An output schema exists, so return values are covered, and the annotations plus description together cover the safety profile. The remaining gap is the unresolvable readOnly/destructive tension and no statement of what happens when the job_id is unknown or already terminal.

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 single job_id parameter has 0% schema description coverage, so the description must carry the burden. It adds a meaningful ownership constraint (the job must belong to the linked account) but gives no format, source, or validity guidance 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 and resource (return the status and saved output URLs of an existing image/video job) plus the scope constraint (owned by the linked account). The closing clause 'it never starts a generation' actively distinguishes it from the sibling generate_media tool.

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?

Context for use is clear — retrieve the state of an already-created job — and the description supplies an exclusion ('never starts a generation') that separates it from generate_media. However, it never names generate_media or explain the expected call pattern (e.g., poll after submitting a job).

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