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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered and the bar is lower. The description adds the scope of what is listed (all uploaded mobile apps) but says nothing about result size, pagination, or whether all items are returned at once.

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, no filler, with the core purpose front-loaded and the parameter hint following. Every clause carries 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?

For a read-only, two-optional-parameter list tool with no output schema and full annotation coverage, this is close to sufficient: purpose, platform scope and enum semantics are all present. Minor gaps remain around result size/pagination and how the returned apps relate to downstream tools like analyzeAppViaTunnel.

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 both enums are fully documented in the schema, including the level=org mapping that the description omits entirely. The description's type sentence largely restates the schema's own wording, so it adds little beyond structured data — 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 (retrieve all uploaded mobile-testing apps) with the platform named, which distinguishes it from siblings like listMobileBuilds or listMobileSessions. It does not explicitly name or contrast with any sibling (e.g. upload_app, deleteUploadedApps), so it stops short of a 5.

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 second sentence gives real selection guidance for the type parameter (android/ios = real devices, emulator/simulator = virtual), which is genuine usage help. However there is no guidance on when to use this tool versus alternatives, and the level parameter is never mentioned, so usage remains implied rather than explicit.

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