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

Annotations already declare this is a non-read-only, non-destructive, non-idempotent operation. The description adds meaningful behavioral context beyond them: required API key in X-API-Key or Authorization Bearer, an explicit error without a key, advisor review, written quote, and no payment collected by this call.

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 three sentences and front-loads the core action and return reference. Each sentence earns its place by covering purpose, authentication, and the no-payment/advisor workflow.

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 explains the returned reference format and the downstream advisor/quote process. Combined with the fully documented input schema and annotations, it is nearly complete, though it could warn more explicitly about duplicate submissions for a non-idempotent creation tool.

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 coverage is 100%, so all ten parameters are already documented in the schema, including the nested agent object. The description only adds the general notion of an identified client and does not clarify parameter syntax, formats, or constraints beyond the schema.

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 states a specific verb and resource: opening a creation file for an identified client and returning a GS-AAAA-XXXXXX reference. This is clear enough to distinguish it from quote, tracking, and jurisdiction-related siblings, but it does not explicitly name or contrast those siblings.

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?

It gives useful context that the file will be reviewed by an advisor and followed by a written firm quote, implying this is the initial creation step. However, it does not explicitly say when to use this tool instead of globalstart_devis or globalstart_suivi_dossier, nor does it state exclusions.

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