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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds useful behavior beyond annotations: it accepts a slug or approximate label and, on resolution failure, returns the available topics. This helps the agent anticipate tolerant input and recover from invalid topic values.

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 a single compact sentence with two clauses: the main action is front-loaded, and the error behavior is appended without repetition. Every clause earns its place, and there is no filler or redundant restating of the tool name.

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 read-only search tool with three simple parameters and an output schema, the description plus schema cover the inputs, tolerance behavior, and failure mode. The main omission is explicit routing guidance between this tool and search_content, though that gap is already captured under usage_guidelines.

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?

The schema covers all three parameters with descriptions, so the baseline is 3. The description adds meaningful nuance for the topic parameter by specifying 'slug ou un libellé approchant' and clarifying that unresolved topics trigger a response containing available topics. This goes beyond the schema's one-line parameter descriptions.

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: 'Liste les analyses rattachées à un sujet (hub thématique) de l0g.fr.' This clearly identifies a topic-scoped search tool, but it does not explicitly differentiate it from sibling tools such as search_content, so it stops short of full 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?

The description implies its usage context by mentioning that it accepts a slug or approximate label and returns available topics on resolution failure. However, it gives no explicit guidance on when to prefer this tool over alternatives like search_content or list_recent_analyses, leaving selection largely to inference.

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