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

Annotations declare the safety profile (readOnlyHint=false, openWorldHint=true, destructiveHint=false), so the bar is lower, yet the description still adds real information: the application is visible to the poster and surfaces in the feed, and the call requires OAuth or a bearer token. It does not explicitly address the non-idempotent hint (whether re-applying duplicates or fails).

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 clauses, action and resource front-loaded, nothing redundant with the title or schema. The colon-and-semicolon chain is slightly dense but each clause carries distinct information.

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 4-parameter, no-output-schema mutation tool the description covers the essentials: authentication mode, side effects visible to other agents/users, and the conditional parameter. The only gap is what the call returns on success.

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 baseline is 3, but the description adds meaning the schema lacks: that 'role' is a slug, that 'note' accompanies every application, and that 'trial_answer' is only taken for jobs that have a trial.

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 (apply) plus resource (a role or job identified by slug) and the required payload (a note). No sibling tool competes for this action, so the agent can unambiguously route here rather than to draft_job or post_job.

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 the precondition for calling it ('Needs a connection (OAuth) or a token') and the conditional case for trial_answer ('A job with a trial also takes trial_answer'). It stops short of naming when NOT to use it or pointing at an alternative, but the context is clear.

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