builds_beta_groups_create_to_many_relationship

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

With no annotations, the description carries the full behavioral burden, and it does the bare minimum: it discloses only the HTTP verb (POST). It does not state that this is additive (appends linkages rather than replacing), what happens to pre-existing relationships, auth/permission requirements, rate limits, or the response shape.

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?

Short overall, but the endpoint is printed twice in immediate succession ('POST /v1/builds/{id}/relationships/betaGroups (POST /v1/builds/{id}/relationships/betaGroups)'), which is pure duplication. The useful scoping information (body shape) is present but unhurried and unstructured.

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 mutating relationship tool with a nested JSON:API envelope body, no annotations, and no output schema, the description is too thin. It leaves the agent to guess the request envelope format, the add-vs-replace semantics, and the effect on existing linkages, all of which a correct invocation depends on.

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% for both required parameters (id and body), so the schema already carries the parameter documentation. The description points at components.schemas.BuildBetaGroupsLinkagesRequest, but that exact reference is already in the body property's schema description, so it adds no new semantic information. Baseline 3 is appropriate.

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 is essentially a restatement of the HTTP method and URL path (duplicated verbatim in parentheses) rather than a plain-language statement of what the tool does. An agent can infer that it links beta groups to a build, but only by decoding the App Store Connect API path convention; the description never says 'add beta groups to a build' in words.

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 when-to-use guidance, no prerequisites, and no mention of alternatives. Siblings such as builds_beta_groups_delete_to_many_relationship (the inverse), beta_groups_builds_create_to_many_relationship (the reverse direction), and apps_beta_groups_get_to_many_relationship exist, yet the description provides nothing to route between them.

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