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 fully covered by structured data. The description adds only the mobile-testing scope, and says nothing about result size, ordering, or whether all uploaded apps 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 short sentences with no filler, and the core action is front-loaded before the type guidance. Nothing that is there is wasted, though the second clause largely duplicates schema documentation.

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?

There is no output schema, so the description should ideally hint at what an uploaded-app entry looks like (ID, name, platform) since the agent will likely feed those IDs into deleteUploadedApps or analyzeAppViaTunnel. For a simple two-optional-parameter list tool this is adequate but leaves a real gap.

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 parameters have enum values, so the schema carries the semantics. The description echoes the type enum (real vs. virtual devices) but never mentions the level parameter (user vs. team/org), which the schema does explain. 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 uses a specific verb+resource ("Retrieve all apps uploaded to TestMu AI") and scopes it to mobile testing, so the agent knows exactly what data comes back. It doesn't name a sibling it is distinct from (e.g., listMobileBuilds vs. listUploadedApps), so it falls short of 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 describes how to pick between real-device and virtual-device app types, which implies a usage context. But it offers no statement of when to call this versus related tools such as listMobileBuilds, checkAppProcessingStatus, or deleteUploadedApps, and no prerequisites or exclusions.

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