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

Annotations already indicate this is a write operation (readOnlyHint=false) with openWorldHint=true. The description adds the behavioral nuance of launching a browser session vs submitting a hosted application, but does not disclose deeper consequences like irreversibility or external effects beyond what openWorldHint implies.

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?

Two concise sentences. The first sentence front-loads the core purpose and the two application modes; the second gives immediate invocation guidance. No wasted words.

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 description covers the two distinct workflows and essential input requirements. It is complete enough for an agent to initiate a call, especially with an output schema present. Minor gaps exist around edge cases (e.g., auto_submit behavior) but those are partially covered by parameter descriptions.

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 clear parameter descriptions. The description adds value by clarifying that hosted postings require name, email, and resume (not in schema), and by explaining the intended usage of job_id as the primary selector. This goes beyond the schema's basic field descriptions.

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 clearly states a specific verb ('Start applying' / 'submit') and the resource (a catalog job or hosted Worklittle application). It distinguishes itself from sibling tools like delete_applied_job and search_jobs by focusing on the application action.

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 provides clear context on when to use: 'applying' to a job, with a distinction between browser-session catalog jobs and hosted postings. It tells the agent to pass job_id and mentions required fields for hosted postings, but does not explicitly exclude scenarios or name alternative tools.

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