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

Annotations already declare readOnly, idempotent, non-destructive, closed-world behavior, so the safety profile is covered. The description adds genuine domain context beyond that: the derived meaning of close_requested_at (set by accepted seller, cleared by any buyer message), auto_released_at (only after 7 unanswered days, implying a completed job was never buyer-marked complete), and bid_count excluding withdrawn bids. It does not cover auth requirements or invalid/nonexistent-id behavior.

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?

The core purpose is front-loaded in the first clause and the text is dense with no filler sentences. However, the bulk of the definition is field-by-field return semantics, which is useful given no output schema but makes the entry long relative to the single-parameter surface.

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 no output schema, the description must carry return-value meaning, and it explains several non-obvious fields (close_requested_at, auto_released_at, bid_count, offer_id, offer_job_number) that an agent could not infer otherwise. It remains incomplete on error handling for a missing/invalid job id and on the full set of returned fields, but it is substantially adequate for a read-only lookup.

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?

There is a single parameter with 100% schema description coverage ('The job's UUID', plus format/pattern), so the schema does the heavy lifting. The description only says 'by id' and adds no format, lookup, or error semantics for job_id, which matches the baseline 3 for a well-documented single parameter.

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 opening sentence names a specific verb (fetch), resource (single job), key (id), and explicitly scopes it across all statuses (open, in progress, completed, cancelled), which distinguishes it from the list-oriented siblings like get_my_jobs and browse_jobs. An agent can select it without opening the schema.

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 rather than stated: the tool fetches one job by id, so listing tools are the alternative, but no when/when-not guidance or named alternative is given. There is one useful cross-reference ('a withdrawn bid is not counted, though get_bids lists it'), which is a partial routing hint but not a full usage rule.

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