Fetch an App Store Connect API URL

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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety is covered. The description adds one genuinely useful constraint not in structured data: only Apple's API host is allowed. It does not mention the saveTo side effect of writing a file to disk, nor response/pagination behavior.

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?

Two sentences, front-loaded with the action and input, then the host restriction. No filler and nothing redundant with the schema.

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 simple read-only fetch with annotations covering safety and a well-described second parameter, this is largely complete. Minor gaps: it doesn't say whether the response's own nextUrl can be re-fed to paginate, and it doesn't flag that saveTo writes a file.

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 50%; the url param has only format=uri in the schema, and the description supplies its real meaning (must be an absolute api.appstoreconnect.apple.com URL, typically a nextUrl or related link). The fully documented saveTo param needs no repetition in the description.

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 (GET) and resource (a full api.appstoreconnect.apple.com URL), and clarifies the input shape versus the sibling operation tools that take operation names/paths. It does not explicitly name a sibling, but the concrete examples (nextUrl, relationship related link) make the boundary clear enough to select it without opening the schema.

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?

Gives clear invocation context: use it when you already hold an absolute URL from a prior response or a relationship link. No explicit exclusions or named alternatives are given, so an agent must infer that asc_call_operation is for constructing calls rather than replaying URLs.

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