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

Annotations include readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds that inputs are validated server-side and output is an audited deliverable, providing some behavioral context. However, it does not disclose potential delays, failure modes, or what the audit entails.

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?

The description is relatively short and front-loaded with the purpose. The reference case is somewhat promotional but still adds context. It earns most of its sentences, except the 'Gapup agent-payable C-suite expertise' phrase is fluff. Overall, it is concise enough.

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?

Despite the tool's complexity (nested objects, 6 parameters, no output schema), the description gives only a vague promise of a 'structured, audited deliverable' without explaining its contents or the expected input structure. It relies on 'documented case fields' but does not document them, leaving an agent with insufficient information to compose a correct request or interpret the result.

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 only 17%, and the description does not compensate by explaining the parameter meanings. It only references 'documented case fields' and provides a high-level example (10 accounts, €89k ARR, etc.), but this does not map to the schema properties. The description fails to clarify the purpose of company, product, accounts, horizon, or targetRenewalRatePct.

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 clearly identifies the tool as 'Optimiseur de renouvellements' (Renewal optimizer) and states it returns a structured, audited deliverable. The CRO (Chief Revenue Officer) expertise framing and reference case (Gapup Hub renewals) establish a specific domain, distinguishing it from sibling tools like churn_defender or upsell_hunter.

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 description implies the tool is for renewal optimization via its name and reference case, but it does not explicitly state when to use it versus alternatives. No exclusions or alternative tool mentions are provided, so the usage context is only implicitly conveyed.

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