list_beta_testers

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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is fully structured. The description adds the optional-filter context but says nothing about pagination, result volume, or return shape; with annotations covering behavior, this is adequate but not rich.

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?

One short sentence with zero waste, and the optional filter constraint is stated up front so an agent can decide immediately whether the parameter is needed.

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 zero-required-parameter read-only list tool whose annotations and schema are complete, the description covers purpose and filtering adequately. The absence of any note on result format or pagination is a minor gap given there is no output schema.

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 the single betaGroupId parameter is documented in the schema. The description merely restates the filter, adding no format or sourcing detail beyond the schema, so baseline 3 applies.

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?

States a specific verb and resource ('List TestFlight beta testers') with the optional filter scope. It is distinguishable from create_beta_tester and list_beta_groups, though it doesn't explicitly name how it relates to those siblings.

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 phrase 'optionally filtered by beta group' implies when the filter applies, but there is no explicit when-to-use guidance, no exclusions, and no mention of alternatives like list_beta_groups or add_testers_to_beta_group.

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