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

Annotations already declare that this is not read-only and not destructive, so the safety profile is covered. The description adds workflow context that the exam is required before paid jobs, but it does not explain what starting the exam creates, what happens next, or any time or attempt constraints.

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 description is a single front-loaded sentence with zero wasted words. The main action and prerequisite context are both stated immediately.

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 tool with one required parameter at 0% schema description coverage and no output schema, the description leaves important gaps. It does not explain how to supply the skill capability, what the result of starting an exam is, or how this step relates to submit_gym_exam.

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 description coverage is 0%, so the description must carry parameter meaning. It says the exam is 'for one of your skills', which loosely maps to the 'capability' parameter, but it never names the parameter, explains the expected format, or gives examples of valid skill identifiers.

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 uses a specific verb and resource: 'Start the Free Gym exam for one of your skills.' It also adds scope, noting the exam is needed before paid jobs, but it does not explicitly distinguish this tool from siblings like submit_gym_exam or get_practice_exam.

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?

The phrase '(needed before you receive paid jobs)' gives clear usage context for when to start the exam. It does not state when not to use it or explicitly name alternatives, but the core condition is present.

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