Add Testers or Builds to TestFlight Group

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

Annotations indicate idempotency and non-destructive behavior, but the description adds no context beyond the annotations. It does not explain idempotency implications or potential side effects. No contradiction, but value is minimal.

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 a single sentence that is front-loaded and concise. However, it is too brief to cover necessary information, earning a high score for structure but not for completeness.

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?

Given no output schema and three parameters, the description is insufficient. It does not explain what happens upon success, error conditions, or the relationship to the group. The annotations provide some context, but the tool expects the agent to infer too much.

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 0%, and the description provides no parameter-level information beyond mentioning 'testers or builds' in the purpose. The meanings of groupId, resourceIds, and resourceType are left entirely to the schema, which has no descriptions.

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 ('add'), the resources ('testers or builds'), and the target ('existing TestFlight group'). It effectively distinguishes from sibling tools like asc_create_beta_group (create group) and asc_create_beta_tester (create tester).

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. There is no mention of prerequisites (e.g., group must exist) or conditions under which this tool is inappropriate. Siblings are not referenced.

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