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

Goes well beyond the annotations by disclosing the auth requirement, the scoring side effect, the specific error condition (409 only on double-finalize), the absence of any purchase requirement, and the fact that the response carries a _rate token. The 409-on-repeat behavior is consistent with idempotentHint=false and destructiveHint=false, so nothing contradicts the structured hints.

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?

Purpose is front-loaded in the first sentence and the following sentences carry operational detail. The '(SPEC benchfree)' internal citation is noise, and the closing cross-promotion to rate_interaction and list_endpoint_ratings, while useful, reads as partly promotional.

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 helpfully notes that a successful result carries a _rate token, and it covers auth, error case, and cost. A mutation that scores answers could say more about what happens to the run state after finalization (e.g., whether it becomes read-only or immutable), which is the remaining gap.

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 100%, with run_id tied back to benchmark_start_run and agent_id documented as the multi-agent disambiguator, so the baseline of 3 applies. The description itself adds no meaning about run_id or agent_id beyond what the schema already provides.

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 ('Finalize an in-progress benchmark run') plus the effect ('Scores the submitted answers'), which separates it from benchmark_submit_answers. It does not explicitly distinguish itself from the read-side siblings (benchmark_get_results, benchmarks_get), leaving the agent to infer that finalize is the state transition.

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?

Gives clear operating context: an API key is required, it applies to an in-progress run, and it should be followed by rate_interaction and list_endpoint_ratings. It does not state an explicit exclusion such as 'do not call before benchmark_submit_answers' or what to do when the run is already finalized beyond the 409 note.

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