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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world). The description adds real behavioral context beyond them: ids remain valid later because they carry what is needed, and NHS Jobs/Teaching Vacancies results surface the closing date. These are useful traits not derivable from annotations.

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?

Front-loaded purpose followed by usage examples and the key id constraint; every sentence carries information. The opening 'Job Spotter. Details for one job...' mildly duplicates the title, costing some tightness but little else.

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 still names a concrete returned field (closing date for NHS Jobs/Teaching Vacancies) and explains id durability, covering what an agent needs to call and reuse it. It could go further on the shape of a job-detail response, but the essentials are present.

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 beyond the schema by stressing that the id must be copied exactly as given and that it encodes sufficient state to keep working later. That reinforces correct invocation rather than merely restating the field.

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 (retrieve details for one job) and scopes it to a job that came from a prior search result, which cleanly separates it from jobspotter_search_jobs. An agent can tell what this returns 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?

Gives explicit triggering conditions with concrete user-phrasing examples ('tell me more about the second one', 'what's the apply link for the Uber job'), which is strong context. It doesn't explicitly name the sibling search tool or state when-not to use this, so it stops short of the top tier.

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