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

Adds real substance beyond the annotations: it discloses side-effect boundaries (nothing goes to the employer), that the tailored CV and cover letter are preserved for later sending, and that a human-readable result lands in the `say` field. This is consistent with destructiveHint=false (nothing is destroyed) and readOnlyHint=false (it does mutate state).

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 with the action and scope, then side effects, then the failure case. Slightly redundant in that the first sentence restates the title verbatim, but every subsequent sentence adds new 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?

With no output schema, the description usefully points to `say` for the result and covers retention and side effects. It stops short of stating the failure mode when the application is no longer queued (error vs. no-op), which matters given idempotentHint=false.

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?

Only one parameter and schema description coverage is 100%, so the schema already carries the id semantics and even names the provenance tools. The description adds only the implicit constraint that it must be the person's own application, which is minimal beyond the structured 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?

Specific verb (stop) on a specific resource (an application) with scope qualification: only while it is still queued, before sending. It distinguishes this from after-the-fact actions by stating 'An application already sent can't be recalled', so an agent can separate it from siblings like edit_application or undo_change.

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 usage context ('while it is still queued, at their request, so it is not sent') and an explicit when-not ('An application already sent can't be recalled'). It does not name a specific alternative tool for the already-sent case, so it stops short of full routing guidance.

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