cigchat_subscriber_create

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

With no annotations, the description carries full weight. It discloses the scope requirement and the need for phone/email, but does not describe side effects, idempotency, return format, or behavior on duplicate subscribers, which is a notable gap for a mutation tool.

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 filler. The key information (action, prerequisite, requirement) is front-loaded and immediately digestible.

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 tool with 7 parameters, no output schema, and 29% schema coverage, the description omits return value expectations, doesn't resolve the required-fields contradiction, and fails to distinguish from create_many. This leaves the agent with an incomplete picture, especially regarding the phone/email requirement.

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 only 29%, so the description must compensate. It adds the crucial 'phone or email is required' condition, but this contradicts the schema's required array listing both fields as mandatory. It does not elaborate on other parameters, though they are mostly self-explanatory.

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 (create) and resource (new subscriber), with the endpoint provided. It distinguishes itself from update/delete siblings through its verb, though it doesn't explicitly reference alternatives like create_many.

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?

It explicitly mentions the required 'Manage Flow' scope, which is valuable usage guidance. However, it doesn't provide context on when to use this tool over creating multiple subscribers (create_many) or when updates are more appropriate, leaving those decisions to the agent.

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