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

Annotations already declare readOnly, idempotent, non-destructive, and closed-world, so the safety profile is fully covered. The description adds substantive behavioral context by specifying what the warnings actually contain (red flags, tests before talk, form knockouts) and that an ATS automation status is returned. It says nothing about auth, rate limits, or behavior for unrecognized postings, and much of the return-value detail overlaps with the existing output schema.

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 imperative "Call before applying" is front-loaded and the rest is a compact enumeration of returned artifacts with zero filler. Some domain jargon ("tests before talk", "form knockouts") is unexplained and costs a little comprehension.

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 an output schema present, return formats need not be described, and annotations already carry the safety profile, so the remaining burden is the trigger and the input contract — both largely covered. The main residual gap is undefined behavior for unknown or unsupported URLs, which an agent would want before committing to the 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?

Schema description coverage is 0%, so the description must carry the load. It does identify both inputs and signals that company is optional ("if known"), which is more than the bare schema default conveys. But it does not explain what happens when company is omitted, whether the URL is used to derive it, or what URL formats are acceptable.

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 description names the resource (a job posting URL plus optional company) and enumerates the three outputs — warnings/red flags, company summary, and ATS automation status — which implicitly distinguishes it from siblings like hirelog_company and hirelog_ats that cover only one slice each. The verb is left in the title ("Check") rather than stated in the description body, so it stops short of a clean verb+resource statement.

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?

"Call before applying" gives a clear temporal trigger, which is genuine when-to-use guidance. However, no sibling is named as an alternative and there is no when-not-to-use rule (e.g., when to prefer hirelog_company or hirelog_ats directly, or what to do if the URL is unsupported).

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