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

Annotations only mark this as a non-destructive write in a closed world; the description adds genuinely new behavior—an exclusive two-hour lease, the expectation that the job is reported within that window, and the caveat that a Marsell-confirmed job can be closed out from under the agent. That concurrency and expiry detail is exactly what annotations cannot convey. It stops short of describing what happens when a claim is refused or whether the lease can be renewed.

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 tight sentences: the action and its rationale come first, followed by the lease duration and the one exception worth knowing. Nothing is redundant with the title or annotations, and no sentence could be cut without losing information.

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 two-parameter claim operation with no output schema, the definition covers the essentials: what claiming means, how long the claim lasts, the obligation to report, and the case where Marsell closes the job early. An agent has enough to call it correctly, and return-value details are appropriately out of scope since no output schema exists.

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%, and both parameters—job_id sourced from homework_list and the optional project disambiguator—are already documented in the schema. The description adds no syntax, format, or edge-case meaning beyond that, 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 uses a concrete verb and resource—"Claims a job before you start it"—and immediately states the reason (preventing duplicate work by another agent). It doesn't explicitly name sibling tools like homework_list or homework_done, so the differentiation is implied through the schema reference to homework_list rather than stated outright.

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?

Timing guidance is clear: call this before starting work, and report the job within two hours. However, it never names the follow-up tools (homework_done, homework_stuck, homework_get) or says what to do if the claim fails because another agent already holds the job, so the agent must infer the surrounding workflow.

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