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

The description discloses that the whole section is rewritten from the website scan, which directly explains the destructiveHint=true annotation and warns the agent that prior section content is lost. It also notes the guide is a draft and that feedback steers output. It does not mention whether the operation is reversible or requires specific permissions, so it stops short of the highest bar.

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?

Three tight sentences, front-loaded with the action and section scope, followed by the two routing rules. No filler; every clause carries routing or behavioral information.

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 mutation tool with full schema coverage and annotations carrying the safety profile, the description covers purpose, alternatives, section scope, and behavioral impact. No output schema exists, so return-value explanation is correctly omitted. Nothing an agent needs to call this correctly is missing.

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 the baseline is 3. The description compensates by glossing the section enum (e.g., audiencePersonas = who it's for) and explaining that feedback steers the regeneration rather than being a generic field, adding intent the schema only flattens.

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 (Regenerates) and resource (one section of a draft brand guide), enumerates the relevant section values, and explicitly names the two siblings it can be confused with (generate_brand_guide, update_brand_guide). An agent can distinguish it from both without opening either 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 explicit when-to-use routing: use this instead of generate_brand_guide when the guide exists but the scan was thin and you have real detail to add, and use update_brand_guide when you only want to change specific lines. Both conditions and both alternatives are stated.

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