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

Annotations already cover read-only, open-world, idempotent, non-destructive. The description adds real value beyond them: a cap of 10 just-added jobs, the meaning of job_count, that the result is empty when nothing was just added, and explicit guidance on which URLs to surface and which to avoid (posted_at, employer apply URLs). No auth or rate-limit detail, but the response-shaping behavior is well disclosed.

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?

Short and front-loaded with the core purpose, and every clause carries information. The telegraphic fragments ('Not posted_at, not an employer apply URL') are efficient but slightly cryptic in isolation.

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 zero-parameter discovery feed with rich annotations and no output schema, the description covers what is returned, the 10-item cap, the empty case, and the URL fields to surface. It stops short of explaining what qualifies a company as 'hiring now' or any ordering, but nothing blocks a correct call.

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?

Zero input parameters, so the baseline is 4. The description's mention of job_count refers to a response field rather than a parameter, which is useful orientation but outside parameter semantics proper.

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 the specific resource: hiring-now companies plus up to 10 just-added jobs from theyond.com, with no keyword. The 'with no keyword' framing implicitly separates it from keyword-based search_jobs, though it never names the sibling or uses a crisp verb like 'list' or 'fetch'.

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 phrase 'with no keyword' hints that this is the keyword-less alternative to search_jobs, but it never explicitly says 'use search_jobs when you have a query' or states any exclusion or prerequisite. Usage is implied, not instructed.

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