update_tag

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

Annotations already indicate readOnlyHint=false and idempotentHint=true, covering the mutation and idempotency profile. The description adds no additional behavioral context, such as side effects or prerequisites beyond 'existing tag'. Since the description doesn't contradict annotations and the bar is lower with annotations, a neutral 3 is appropriate.

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, concise sentence that front-loads the key information. Every word earns its place, with no redundancy or extraneous detail.

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?

Given the tool's simplicity (2 required, well-described params, no output schema, and annotations), the description is adequate for an agent to invoke it correctly. It does not explain return values, but for a simple rename operation this is not critical. It might benefit from a note about idempotency, but that is already in annotations.

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%, with 'id' and 'name' clearly described. The description adds no extra parameter details beyond the schema, but it does reinforce that the tag is existing and the name is new. The baseline is 3 for full schema coverage, with minimal extra value.

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 'Rename an existing tag' uses a specific verb ('rename') and resource ('tag'), clearly distinguishing it from sibling tools like create_tag, delete_tag, and list_tags. It unambiguously states what the tool does.

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 usage (when you want to rename a tag) but provides no explicit guidance on when to use this vs alternatives. It does not mention that create_tag should be used for new tags or delete_tag for removal, so the agent must infer from context.

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