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

Annotations already declare readOnlyHint=false, destructiveHint=true, idempotentHint=true and openWorldHint=true, so the mutation/idempotency profile is known. The description contributes one genuinely new behavioral fact — a blank name returns 422 — which tells the agent a precondition and the failure mode.

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 short sentences, no filler, with the action and target front-loaded and the error case trailing. Every clause carries 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?

Return values needn't be explained because an output schema exists, and annotations carry the safety profile, leaving the description responsible mainly for purpose and edge cases — both covered. The only shortfall is the absent when-to-use context, which is minor for a single-purpose rename.

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?

With 100% schema description coverage the baseline is 3, and the description adds a real constraint for the 'name' parameter (must be non-blank, else 422) plus reinforces that 'id' is a UUID. The 'context' parameter is left entirely to the schema, but the added validation meaning pushes this above baseline.

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 and resource ('Rename a signature folder') plus the identifier requirement ('by UUID'), and the verb choice cleanly separates it from create_folder, delete_folder and list_folders. It does not explicitly name or contrast those siblings, but the purpose is unambiguous.

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?

There is no guidance on when to use this versus update_asset/update_email or versus delete_folder, and no prerequisites beyond the UUID mention. The blank-name clause is a validation rule, not usage direction, so an agent gets no routing help.

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