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

With no annotations, the description carries the full burden and does real work: it discloses that retries are free, that each job ID gets only one manual retry per transaction/token check, that there is no automatic refund, and that unresolved failures go to a support address with the job ID retained. It omits whether the retry re-executes asynchronously and what the immediate response indicates.

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 sentences, no filler, and the core action and its 'for free' benefit are front-loaded. The middle sentence is dense (mixing the retry limit, failure path, and contact instructions) but every clause carries actionable information.

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 single-parameter tool with no annotations and no output schema, the description covers the key facts an agent needs: when it applies, the retry budget, cost, and what to do if the retry fails. The only gap is what the tool returns on success, which would tell the agent whether to poll get_job_result again.

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 baseline is 3, but the description adds meaning the schema alone does not: the job ID must be a *failed* paid transaction or token check, and the retry-per-job-ID budget is a property of that identifier rather than an extra input.

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 ('Retry a failed paid job') plus a notable scope modifier ('for free'), and ties itself into the paid-job workflow via 'Transaction and token checks'. It is clearly distinguishable from the check_* siblings and get_job_result, though it never names a sibling tool outright.

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 schema text gives an explicit precondition ('after get_job_result reports failure'), and the description adds the retry budget ('one manual retry per job ID') and the escalation path when it still fails. What's missing is an explicit statement of what NOT to use it for (e.g. successful jobs), so it stops short of a full when/when-not pair.

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