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

Annotations already declare the safety profile (readOnlyHint=false, destructiveHint=false, openWorldHint=false), so the description only needs to add context; it contributes the judge-role framing and the API-key auth requirement, which are useful. It omits whether dismissal is reversible, how it interacts with the idempotencyKey parameter the schema offers, and what state the case lands in — gaps that matter for a terminal state transition.

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?

Three short sentences, front-loaded with the actor and action, with no filler. The clipped phrasing ('Why (up to 1000 characters)'-style terseness in the schema aside) keeps it efficient, though 'Needs your API key' reads as a tacked-on afterthought.

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 3-parameter mutation tool with no output schema, the description covers what happens (case closed without verdict) and the auth requirement, and annotations carry the safety profile. It still leaves the post-dismissal state, error conditions, and retry/idempotency semantics unexplained.

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%, so caseId, reason, and idempotencyKey are already documented in the schema; the baseline of 3 applies. The description adds only the fact that a reason is supplied ('giving a reason') and nothing about idempotency behavior or the reason's semantics.

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 ('The judge dismisses the case') and adds the key scope detail that it 'closes without a verdict,' which implicitly separates it from issue_verdict and conclude_stage among the siblings. It does not, however, name withdraw_case or any sibling explicitly, so differentiation still requires inference.

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?

There is no statement of when to choose dismissal over the adjacent siblings (withdraw_case, conclude_stage, issue_verdict), nor any prerequisites beyond 'Needs your API key.' The phrase 'closes without a verdict' hints at the condition but never states it as guidance.

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