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

Goes well beyond annotations (readOnlyHint=false, destructiveHint=false, idempotentHint=false) by disclosing that internal applications are submitted in the user's name and require explicit consent, that duplicates are rejected, and that jobs must be published and unexpired. It also clarifies that no write occurs for external jobs, which meaningfully sharpens the mutation semantics.

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-loads both outcomes in the first sentence and uses the remaining two short paragraphs for the consent requirement and eligibility rules. Every sentence carries distinct information with no filler.

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 compensates by describing both possible return shapes (created application vs external applicationUrl) plus the preconditions and idempotency constraint. An agent has everything needed to call and handle the result correctly.

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% with a single required jobId already documented as the ID of the job to apply to. The description adds outcome context but no additional meaning about the parameter format or constraints, so the baseline 3 applies.

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 and resource (apply to a job) and immediately defines its dual outcome, making it clearly distinguishable from siblings like save_job or search_jobs. The internal-vs-external split is spelled out with the exact return signal ('applicationType "external"' with 'applicationUrl').

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?

Explains the branching behavior by job type and instructs the agent to share the external link rather than attempt submission, which is actionable routing guidance. It does not explicitly compare against sibling tools (e.g., save_job) or state when an agent should prefer saving over applying, so it stops short of a 5.

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