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

Annotations already declare destructiveHint=true, idempotentHint=true and openWorldHint=true, and the description adds real context beyond them: one application consumes one credit, the request is queued rather than sent without a hosted send grant, no employer contact or charge occurs in that case, approval and grant URLs are returned, and the same idempotency_key must be reused on retries. Nothing is contradicted and much is clarified.

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?

Four tight sentences with the action and its precondition front-loaded, then mechanics, then the failure path, then the retry rule. Dense but every sentence carries distinct information; slightly information-packed for easy scanning but no filler.

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?

An output schema exists, so return values need not be spelled out, yet the description still names the approval and grant URLs it returns. It covers eligibility, credit cost, credit/grant gating, safety and idempotency for a destructive, open-world write. Remaining detail such as resume selection semantics is delegated to the 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 80%, so the baseline is 3, and the description adds meaning beyond the schema by explaining the idempotency_key retry contract ('Reuse the same key when retrying the same request') and the job_approved prerequisite. It does not explain resume_source or resume_variant_id selection, but those are documented in the schema itself.

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 with scope: 'Apply to one job only after the member approves that named job,' which tells the agent this submits exactly one application. It implicitly separates itself from answer_screening_question ('Never accepts screening answers') and approve_application ('Requires job_approved true'), but never names a sibling alternative for a given condition, so differentiation is indirect rather than explicit.

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 clear preconditions for use: member has approved the named job, current profile, truthful automatic answers and tailored documents, plus job_approved=true and a stable idempotency_key. It also explains the fallback path when the hosted send grant is absent (holds without employer contact or charge, returns approval and grant URLs). No sibling is named as an alternative, so it stops short of full when/when-not routing.

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