list_beta_app_localizations

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

No annotations are provided, so the description must carry behavioral responsibility. It makes the read-only nature clear by using 'List' and describes the content being returned, which is helpful. However, it does not mention pagination behavior, output structure, or any other nuances that would prepare the agent for the tool's runtime behavior, though for a simple list tool this information is largely inferable.

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 exactly two sentences, with the key scope and differentiating clause front-loaded in the first sentence and the important 'not the App Store listing' clarification in the second. There is no filler or tautology; every phrase adds meaningful information.

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 has a modest parameter set (3) and no output schema, yet the description covers the main intent, the content returned, and the distinguishing context. It does not describe return shape or pagination, but for a simple list tool this is a minor gap. The absence of an output schema suggests the description should be slightly more explicit, but it is still sufficient for correct selection and invocation.

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?

The input schema already covers all three parameters (app_id, limit, locale) with clear descriptions, so the baseline is 3. The description adds extra context about the kind of data being filtered (per-locale beta metadata), which reinforces why the locale parameter exists and what the results represent. This modest extra value above the schema earns a 4.

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 uses a specific verb (List) and names the exact resource (TestFlight app localizations for an app). It further clarifies the domain by listing the content fields (beta description, feedback email, marketing and privacy policy URLs), and explicitly distinguishes this from the App Store listing, which prevents confusion with the sibling list_app_store_version_localizations.

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 description clearly states the tool's scope (tester-facing TestFlight metadata) and explicitly excludes the App Store listing. While it does not name the sibling tool directly, the contrast with 'not the App Store listing' tells an agent to use this only for TestFlight metadata and look elsewhere for App Store data. This is strong, though not as explicit as naming the alternative.

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