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

No annotations are provided, so the description carries the full behavioral burden. It usefully discloses 'No auth required' and 'Mirrors GET /api/v1/jobs/{job_id}', which signals a read-only, idempotent operation and no credential setup. It does not cover behavior when the id is unknown or malformed, so the disclosure is partial rather than complete.

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 short sentences, front-loaded with the when-to-use trigger, then the capability, then the auth/endpoint details. Every sentence adds something and nothing is padded.

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 read tool with no output schema and no annotations, the description covers the key facts an agent needs: what it returns ('full detail'), that it is unauthenticated, and the underlying endpoint. The only real gap is the not-found/error behavior, which is minor.

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 description coverage is 100% with a single required job_id parameter (pattern ^job_), so the schema already carries the parameter semantics. The description adds nothing about id format or lookup failure modes, which is the expected baseline when the schema does the work.

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: fetch a single job by id, backed by 'Full detail for a single job.' It also names the sibling list_jobs as the typical upstream source, so an agent can distinguish this from list_jobs without inspecting schemas.

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?

'**When to use**: Fetch a single job by id — typically after seeing it in list_jobs results' gives a clear trigger condition and implies the alternative (list_jobs) for the enumeration case. No explicit when-not or error-path guidance, so it stops short of a 5.

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