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

Annotations only declare readOnlyHint=false and destructiveHint=false; the description goes well beyond that by disclosing that nothing is sent to the applicant, that rejection is reversible, that non-reviewable applicants exist, and that results are reported per id so a partial failure still applies the rest. These are exactly the mutation-side effects an agent needs; only the response shape is left implicit.

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?

Semantically dense but front-loaded: the core action comes first, then constraints, then the sibling pointer, then the failure semantics. No filler sentences and no repetition of the title.

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 with no output schema, it covers side effects, reversibility, eligibility, and partial-failure behavior. The only shortfall is that the return payload (per-id results) is described only qualitatively rather than indicating what a success or failure entry looks like.

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 status enum, 1-50 match id bounds, and the productId provenance are already documented in the schema. The description adds the useful framing that status applies to 'every listed applicant', but otherwise restates rather than extends parameter meaning — the correct baseline of 3 when the schema does the heavy lifting.

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 (sets) and resource (review status of applicants) plus the exact enum values it accepts, so the action is unambiguous. It also explicitly distinguishes itself from the nearest sibling by stating that shortlisting does not invite and that inviteApplicants is a separate step.

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 explicit prerequisites (get match ids from listApplicants) and explicit exclusions (applicants already invited or joined cannot be re-reviewed). It also names the alternative tool, inviteApplicants, for the adjacent task, leaving little to inference.

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