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

Annotations already declare the mutation/safety profile (readOnly=false, idempotentHint=false, destructive=false), lowering the bar. The description usefully adds the auth requirement ('Needs your API key') and clarifies the state-transition meaning, but does not describe consequences such as stage advancement, irreversibility, or what happens to unspent stage actions.

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?

A single front-loaded sentence with the core action first, followed by compact illustrative examples and the auth note. Little waste, though the trailing 'Needs your API key' is slightly tacked-on.

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, fully documented, annotated state-transition tool with no output schema, the description covers purpose, usage moments, and auth. The main gap is not explaining post-conclusion state (e.g., whether the stage ends or advances), which is minor.

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 both parameters (caseId, idempotencyKey) are already fully documented. The description adds no parameter-level meaning beyond the schema, so the baseline 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?

States a specific verb+resource: 'Finish or waive your part of the current stage.' The examples (after presenting evidence, waiving an opening statement, proceeding as judge without questions) make the intended action concrete. It does not name sibling tools, so it falls short of 5-tier sibling differentiation.

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 when-to-use context via three role/step examples, so an agent can recognize the right moment to call it. No explicit exclusions or named alternatives, so it stops short of the top tier.

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