update-playlist-image

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

With no annotations provided, the description bears full responsibility for behavioral disclosure. It only discloses the 50-quota-unit cost, but omits side effects such as whether the old image is destroyed, whether replacement is reversible, or any permission requirements. 'Replace' implies mutation but lacks detail, making this insufficient for a write operation.

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 one concise sentence stating the action, followed by a brief note on the quota cost. It is front-loaded with the verb and resource, contains no filler, and every word adds 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?

Given the simple two-parameter operation, the description conveys the core purpose and cost, but lacks context on prerequisites (e.g., owning the playlist), behavior on failure, or what the response contains. With no output schema or annotations, this is a minimal but barely adequate completion for the tool's complexity.

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 has 100% coverage, with both parameters described ('Absolute local path to the replacement image file' and 'Playlist image ID'). The description adds no further parameter semantics beyond what the schema already states, 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?

The description clearly states a specific action with a verb and resource: 'Replace a playlist cover image's file.' This distinguishes it from siblings like upload-playlist-image (creating/adding) and delete-playlist-image (removing), and the word 'replace' signals updating an existing 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 (replacing an existing playlist cover image's file) but provides no explicit when-to-use guidance or exclusions. It does not mention alternatives like upload-playlist-image for new images or note when not to use it, leaving the agent to infer from the name and context.

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