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

Annotations already declare readOnlyHint=true and openWorldHint=false, so safety is covered externally. The description adds only the single word "Free", which hints that the call has no cost or side effect, and its enumeration of returned fields is largely redundant with the output schema. No mention of behavior for finished or unknown exam ids, which is the most useful thing it could have disclosed here.

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?

It is short with no filler sentences, but the structure is a sentence fragment with no leading verb, and the trailing one-word "Free." is ambiguous — it could mean no cost, no rate limit, or no state change. Brevity here shades into under-specification rather than efficiency.

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 one-parameter read tool with an output schema and clear annotations, the description covers the essentials of what is returned, so an agent can call it correctly. It remains silent on whether the tool works only on an in-progress exam and what happens if the id is stale, which is the main open behavioral question.

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?

There is one required parameter at 100% schema coverage, and the schema already explains it is the exam id from agent_safety_exam_start. The description adds nothing about the parameter, so the baseline of 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?

The description names the resource precisely — the task sheet of a running exam — and enumerates the payload contents (every task, which ones are answered, the deadline), which is enough for an agent to distinguish it from agent_safety_exam_answer or agent_safety_exam_finish. It is a noun phrase rather than a verb-driven statement, so the read action is implied rather than stated, which keeps it short of a 5.

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?

"of a running exam" implies the precondition that an exam must already be started, but the description never says when to call this versus agent_safety_exam_howto or agent_safety_exam_finish, and offers no exclusions. Usage is inferable from context but not stated.

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