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

Annotations already cover readOnly, idempotent, closed-world and non-destructive, so the safety profile is settled; the description adds a payload preview of which sub-resources come back, which is genuinely useful. It does not say what happens when the job_id is unknown (empty vs error) or whether the response is expensive to assemble.

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?

One sentence with zero padding and the key noun front-loaded, but it is a verbless fragment that reads as a field list rather than a definition. Its size is appropriate; its grammatical shape is slightly weak.

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?

Given a single required param, no output schema and rich annotations, most of what an agent needs is present. Still missing is failure behavior for a bad job_id and confirmation of the record's scope, which matter for a fetch-by-id tool with no output schema.

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% and the single parameter is documented as 'job_id from list_jobs', giving provenance. The description adds nothing about the parameter, but with one fully documented param the baseline is high and no compensation is needed.

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 resource ('One job') and enumerates the facets it returns: line items, schedule, employees, balance, and invoices. That distinguishes it from get_invoice/get_estimate/get_schedule as the job-level aggregate, though it never names or contrasts a 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?

No when-to-use guidance, no exclusions, and no statement of prerequisites or alternatives. The only pointer to list_jobs lives in the schema for job_id, not in the description, so the agent must infer that this is the single-record counterpart.

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