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

Annotations already mark this as destructive (destructiveHint: true). The description adds value by emphasizing 'this MODIFIES live data' and specifying it returns the updated list, providing clarity beyond the annotation. No contradiction with annotations.

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 extremely concise, using two sentences plus an API endpoint reference. It front-loads the key action and result, with no wasted words. Every sentence serves a clear purpose.

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 tool with two required parameters and no output schema, the description covers the main behavior (update, return list) and side effect (modifies live data). It could mention prerequisites or error cases, but overall it is fairly complete given the tool's simplicity.

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%, and both parameters (list_id, name) are already well-documented in the schema. The description only mentions 'Sets the list's `name`' which repeats the schema, adding no new semantics beyond what is already provided.

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 clearly states the action (UPDATES), the resource (existing list by id), and the specific field ('Sets the list's `name`'). It also notes that it modifies live data and returns the updated list, distinguishing it from sibling tools like create_list, get_list, or delete_list.

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 does not explicitly state when to use this tool versus alternatives like create_list or get_list. It implies usage for updating a list name, but lacks explicit 'when to use' or 'when not to use' guidance, making it less helpful for an AI agent deciding between siblings.

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