vk_photos_get_chat_upload_server

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

The description does not disclose behavioral traits such as whether the upload link expires, required permissions, or any side effects. With no annotations provided, the description fails to compensate, offering only that it returns an upload link.

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 a single sentence, which is concise but lacks necessary detail. It is appropriately sized for a simple tool, but could be more informative without adding significant length.

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 lack of output schema and only 50% schema parameter coverage, the description is incomplete. It does not explain the format of the upload link, prerequisites (e.g., existing chat), or how to use the returned link.

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 coverage is 50%, but the description adds no parameter-specific information beyond what the schema provides. Parameters like crop_x and crop_y lack descriptions in both schema and description, requiring the agent to infer meaning.

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 tool returns an upload link for chat cover pictures, using a specific verb and resource. It distinguishes from sibling tools like vk_photos_get_messages_upload_server and vk_photos_get_owner_cover_photo_upload_server by specifying 'chat cover pictures'.

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?

No guidance is provided on when to use this tool versus alternatives. For example, it does not mention that this is for chat cover photos only, not for messages or owner covers, leaving the agent to infer from the tool name and description alone.

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