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

Annotations already declare readOnlyHint=false, destructiveHint=false, and idempotentHint=true. The description adds valuable behavioral context beyond those: it explicitly states the mutation scope is limited to the name while content and channel are preserved. This clarifies what side effects occur and what remains untouched, which is useful for an agent deciding whether this tool fits.

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 two short sentences with no wasted words. The primary action is front-loaded, and the key qualifier about unchanged content/channel follows immediately. Every phrase earns its place.

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, non-destructive, idempotent rename operation, the description, combined with the annotations and complete schema, covers almost everything an agent needs to invoke it correctly. It does not mention required preconditions like the broadcast existing, or describe the return value, but these are minor given the tool's simplicity and the available structured metadata.

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 adds operational meaning beyond the schema: it tells the agent that only the name changes and that broadcast_id identifies which broadcast. This reinforces the role of each parameter without repeating schema text. It does not go into format or validation, but given the high schema coverage and simple parameters, the added clarity justifies a 4.

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 states a specific action and resource: 'Rename a broadcast.' It also adds a distinguishing boundary with 'Content and channel are unchanged,' which clearly separates it from content-editing tools like put_broadcast_content or channel-related operations. An agent can identify the tool's purpose without opening the 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?

The description clearly implies when to use the tool: when you need to change only the broadcast name. The statement 'Content and channel are unchanged' provides an exclusion—if content or channel needs changing, another tool is appropriate. However, it does not explicitly name alternative tools or provide concrete when-to-use/not-use conditions, so it stops short of a 5.

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