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

Annotations already declare destructiveHint=true, idempotentHint=true and readOnlyHint=false; the description adds real value beyond them by disclosing that the image is downscaled to 512 px and that a readability check is returned. It does not explicitly state that an existing logo is replaced, which is the main residual gap given destructiveHint=true.

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?

Front-loaded with the action and effect, then workflow guidance and return value. Dense but every sentence carries information; only the repeated slug-discovery hint is mildly redundant with the schema.

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 names the return value (readability check) and covers prerequisites, image handling and accepted formats. A statement about overwriting the previous logo would complete it.

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% and the description mostly restates what the schema already documents (slug from list_galleries, image format). It adds the note that the image may be generated in-conversation or user-supplied, but no new syntax or constraint detail, 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 ('Pose une image comme logo') and resource (galerie du compte connecté), and scopes the effect precisely (en-tête, mur live, aperçus de liens). An agent can distinguish this from create_gallery/update_gallery without opening any schema.

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 an explicit prerequisite workflow: call get_gallery first and follow its logo_guidance before generating a logo, and use list_galleries to obtain the slug. It lacks an explicit when-not condition, but the sequencing guidance is strong and actionable.

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