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

Beyond the annotations, the description discloses that the tool validates the file, publishes it, places it into the slot, and names the replaced cover via `replaced`. It also explains the 409/422/502 failure modes, which is substantial behavioral context that annotations do not provide.

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?

The description is dense but well organized: workflow position, validation steps, side effects, error codes, and retry safety are all covered in three sentences without filler. Information is front-loaded and each 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?

Despite no output schema, the description mentions the `replaced` result field and covers validation, publishing, side effects, error conditions, and retry safety. For a 2-parameter tool in a multi-step workflow, this is complete enough for an agent to invoke it correctly.

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 the parameter descriptions already explain that mediaId comes from start_cover_upload and applicationId from list_applications. The description adds no further parameter-level detail, so the baseline score of 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 states a specific action (confirm a cover upload), identifies it as step 3 of 3 after the PUT, and explains what it does: validate, publish, and place the file into its slot. This clearly distinguishes it from sibling tools like start_cover_upload and confirm_archive_upload.

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 description explicitly says when to call it ('Step 3 of 3, after the PUT') and gives actionable error-based guidance: on 422 start a new upload, on 502 it was not confirmed and can be retried. It also notes it is safe to repeat, making retry behavior explicit.

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