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

Annotations already declare readOnlyHint/idempotentHint, so safety is covered; the description adds genuine semantics by mapping raw status values into pending-vs-finished buckets and explaining what 'completed' actually means (submitted). It says nothing about pagination or result ordering behavior, which keeps it short of a 5.

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 compact sentences, front-loaded with the resource and its pending/finished split, then the invocation rule, then the filter list. No sentence is filler and nothing is buried at the end.

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?

The tool has an output schema, so return values need not be described, and annotations cover the safety profile. The description supplies the domain grouping that the schema cannot express; the only meaningful gaps are limit/pagination behavior and the status value example that disagrees with the enum.

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?

With schema coverage at 25%, the description must do the heavy lifting, and it does list the filterable fields (status, job_id, applicant_id). It adds little beyond the schema, omits limit/pagination entirely, and its example status value 'applied' does not match any enum member (the closest is 'completed'), which could mislead an agent constructing a filter.

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+resource (list applications) and immediately disambiguates the two result classes: pending (matched, awaiting approval, running, awaiting user) and finished (completed/submitted, failed, stopped). This is enough to distinguish it from siblings like list_active_applications and check_application_status without opening any schema.

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 an explicit invocation rule — 'Check it before applying so the same job is never applied to twice' — which is real, actionable guidance rather than implied usage. It does not, however, name the sibling tools (list_active_applications, check_application_status) or say when those are preferable, so there is no explicit alternative routing.

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