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

Annotations already establish readOnlyHint=false, destructiveHint=false, openWorldHint=false, and idempotentHint=false, so the safety profile is largely covered. The description contributes the auth prerequisite ('Needs your API key') and the fact that a reason is mandatory, which is real added context. It stops short of describing consequences of withdrawal, whether it is reversible, or how the non-idempotent behavior interacts with the idempotencyKey parameter.

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 short sentences, no filler, and the core action is front-loaded with the auth prerequisite trailing. Every clause carries information; nothing could be cut without losing meaning.

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 mutating tool with a fully specified three-parameter schema and annotations covering the safety profile, the description supplies the action, the required reason, and the auth need. No output schema exists, so return values need not be explained, and the remaining gap is sibling differentiation rather than a missing call-critical detail.

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 all fully documented structurally. The description merely echoes the reason parameter ('giving a reason') without adding format, length, or content constraints beyond what the schema states. Baseline 3 is appropriate when the schema carries the parameter burden.

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: 'Counsel withdraws from representing its side, giving a reason.' An agent can distinguish this from sibling mutations like withdraw_case, withdraw_evidence, and withdraw_settlement_offer because it names the counsel role and the represented side. It does not, however, explicitly differentiate itself from decline_counsel_request, the nearest-looking alternative.

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?

The only guidance is a prerequisite ('Needs your API key'), which is an auth requirement rather than usage context. It gives no when-to-use signals, no condition for choosing this over decline_counsel_request or conclude_stage, and no mention of when withdrawal is inappropriate. The agent must infer intent from the name alone.

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