upload-playlist-image

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

With no annotations provided, the description carries full behavioral disclosure burden. It adds the useful context of 'Costs 50 quota units', but does not disclose whether the upload overwrites an existing cover image, file format constraints, or required permissions. This is a partial disclosure.

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 two short sentences that front-load the action and then provide the quota cost. There is no redundant text or filler, making it highly concise.

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?

The tool is structurally simple (two required params, no nested objects, no output schema). The description covers the core action and cost, but lacks details on return value, file type/size limits, and overwrite behavior. These gaps leave moderate incompleteness for an agent deciding to invoke it.

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?

The input schema already provides full descriptions for both parameters (playlistId and filePath) with 100% coverage. The description's 'from a local file' merely reinforces the filePath parameter without adding new semantic meaning, so it stays at the baseline for high schema coverage.

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 clearly states the action (upload), the target (cover image for a playlist), and the source (from a local file). This distinguishes it from sibling tools like list-playlist-images, update-playlist-image, and delete-playlist-image.

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 implies the use case of uploading a local file as a playlist cover but does not explicitly mention alternatives or when-not-to-use. It provides clear context but no exclusions.

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