create_a_list_group_permission

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

The description explicitly states 'Not idempotent — calling twice may create duplicates,' which adds value beyond the annotations (idempotentHint=false). It also clarifies it's a write operation. However, it could mention side effects or required permissions.

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 concise and front-loaded with an emoji, method, and resource. However, there is slight redundancy between the title and the first sentence. Efficient but not perfect.

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?

The description lacks information about the return value (e.g., the created record) and any prerequisites. For a creation tool with no output schema, this is a gap. Adequate but not fully complete.

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% with descriptions for listid and groupid. The description does not add any additional meaning or context for the parameters, so baseline 3 is appropriate.

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 it creates a list group permission and provides the HTTP method and resource. However, it does not explicitly differentiate this tool from similar sibling tools like 'create_new_list' or 'create_a_group', which also create resources.

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?

No guidance on when to use this tool versus alternatives. The description does not mention prerequisites, context, or exclusions, leaving the agent with no decision support.

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