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

Annotations already declare destructiveHint=true, idempotentHint=true, readOnlyHint=false and openWorldHint=false, so the safety profile is covered structurally. The description adds genuine context by explaining that URL correction is meaningless without re-running the website scan, which justifies the tool's narrow scope, but it never addresses the flags it is annotated with — notably why a rename is flagged destructive or what side effects occur.

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?

Two sentences, front-loaded with the action, and the routing note comes second where it can't obscure the primary purpose. The second sentence is slightly verbose in justifying itself, but no sentence is wasted.

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 simple two-parameter mutation with full schema coverage and annotations, the description is largely adequate and covers the main gotcha. It falls short of completeness by omitting rename side effects and any permission or state preconditions, which matters given the destructive and idempotent hints.

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 100% (both brandId and name are documented, including the provenance hint "from list_brands"), so the schema carries the parameter burden. The description adds no format, validation, or uniqueness semantics for the new name beyond what the schema states, which is the expected baseline here.

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 first sentence gives a specific verb and resource ("Renames a brand"), and the second sentence draws a boundary against a plausible but wrong use (correcting websiteUrl), naming the sibling that owns that job. It is clear and differentiable, though it doesn't describe the scope of what a rename affects (assets, guides, campaigns referencing the brand).

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 supplies one explicit when-not rule — URL correction belongs to retry_brand_ingest — with a rationale. However, there is no positive guidance on when to call rename_brand, no prerequisites (e.g., brand must exist or be in a particular state), and no mention of other overlapping siblings like archive_brand or create_brand.

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