Fetch an App Store Connect API URL

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

Annotations already declare readOnlyHint and openWorldHint, so safety is covered. The description adds genuinely useful behavioral context beyond them: the request is a GET and the URL must resolve to Apple's API host, which tells the agent this is a constrained passthrough rather than an arbitrary HTTP client. It says nothing about authentication or rate limits, so not a 5.

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 tight sentences: the capability and its examples come first, the hard host restriction second. No filler, nothing to trim.

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 passthrough with no output schema, the description covers the essential routing and the host constraint. However, with 0% schema coverage it leaves 'saveTo' and the response shape entirely undocumented, which is a real gap for an agent deciding whether the result is returned or written to disk.

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 there are two parameters. The description indirectly explains 'url' (must be a full Apple API URL) but gives no syntax guidance, and 'saveTo' is completely unexplained — an agent cannot tell that it likely persists the response to a file path rather than returning it inline.

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 a clearly bounded resource (a full api.appstoreconnect.apple.com URL), and the examples of nextUrl and relationship related links make it obvious this is the generic escape hatch rather than one of the specific asc_list_* 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?

Gives concrete when-to-use triggers (following a nextUrl from a prior response, or a relationship's related link) and a hard precondition (only Apple's API host is allowed). It does not explicitly name a when-not case or point at an alternative tool, so it stops short of 5.

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