subscribe_to_list

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

No annotations are present, so the description must disclose behavior. It only restates the action without explaining side effects, reversibility, permission requirements, or how the 'subscribed' parameter toggles state. The description adds minimal insight beyond what the schema already provides.

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, front-loaded with the verb and resource. No redundant or extraneous information; every word 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?

The tool is simple with a well-described schema, but the description is minimal. It does not mention that subscription is a toggle (though the schema implies it), any prerequisites (e.g., membership), or what the response will contain. While adequate, it could provide more operational context.

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 covers 100% of parameters with descriptions, so baseline is 3. The description adds no additional parameter context beyond what the schema already provides, and the schema fully explains each parameter including the boolean toggle.

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 ('Subscribe to a list') and its purpose ('receive notifications about changes to a list'). This distinguishes it from sibling list-management tools like update_list or archive_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?

Provides a clear use case ('Use this tool to receive notifications'), which serves as guidance for when to use it. It does not mention exclusions or alternatives, but there is no competing subscription tool among siblings, so the guidance is sufficient.

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