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

Annotations already cover the safety profile, and the description adds meaningful behavior: list visibility effects, network/domain blocking with a free-provider exception, deferred $0.50 fee behavior, and per-call cost with no charge on failure. It does not address idempotency or permissions, but the disclosed side effects are substantial and consistent with readOnlyHint=false.

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 main action and important caveats are front-loaded, and the description is generally efficient. The stray duplicate cost sentence ('$0.001. Costs $0.001 per call...') is redundant and slightly hurts structure.

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 three-parameter mutation tool with no output schema, the definition covers key side effects, billing timing, failure behavior, and the free-provider exception. It leaves some gaps around applicant_id semantics and idempotency, but is largely complete.

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 only 33%, and the description usefully clarifies spam defaults and the special blocking behavior beyond the block schema text. The required applicant_id is not explained beyond its name, so the description only partially compensates for the low schema coverage.

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 states a specific verb and resource: moving one application to spam or back. It also clarifies the effect on hiring_list_applicants and the role of the spam flag, so the core action is unmistakable.

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?

It gives clear conditions for spam true/false and block true, including a useful free-provider exception. However, it does not explicitly route the agent against alternatives such as hiring_delete_applicant, hiring_move_applicant, or hiring_update_blocklist.

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