Upload for internal app sharing

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

Annotations already declare readOnlyHint=false, idempotentHint=false, destructiveHint=false, and openWorldHint=true, so the mutation profile is covered. The description adds genuine context beyond that: the operation bypasses tracks and review, and the produced link is testing-only, which tells an agent this is a side-channel rather than a production release path. Auth needs and rate limits are unaddressed, keeping it from 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 with no filler; the core action and the return value are front-loaded, and the caveat about bypassing tracks/review follows. Every clause earns its place.

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?

With no output schema, the description usefully states the return value (a download link) and the testing-only nature of the artifact, which is what an agent most needs. Minor gaps remain around link persistence/expiry and whether the upload is scoped to the configured package, but the essentials are covered alongside rich annotations.

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%, so both parameters (file_path, package_name) are already documented in the schema down to accepted file types and the PLAY_MCP_PACKAGE default. The description restates the file-type detail but adds no new parameter meaning, so the 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?

Specific verb (Uploads) + resource (.aab/.apk to internal app sharing) plus the outcome (returns a download link for testers). The phrase 'Bypasses tracks and review' distinguishes it from sibling publishing tools like upload_bundle and create_release without opening their schemas.

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?

It clearly frames the intended context ('for testers', 'links are for testing only') and contrasts with the normal track/review flow. It stops short of naming an explicit alternative tool or stating a hard when-not-to-use rule, so it is strong context rather than full routing guidance.

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