vk_photos_get_owner_cover_photo_upload_server

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

With no annotations, the description carries the full burden of behavioral disclosure. It only states the return value (server address) but does not mention that the operation is read-only, requires authentication, or what the returned address should be used for (e.g., subsequent upload). The description adds minimal value beyond the tool's name.

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 and front-loaded. It avoids unnecessary details but could be slightly expanded to improve clarity without losing conciseness.

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 absence of an output schema, annotations, and the presence of many sibling tools, the description is insufficient. It does not explain that this is a step in a larger upload workflow, nor does it specify the role of the crop parameters or community context. An agent lacks guidance on how to integrate this tool effectively.

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 descriptions for all 5 parameters (83% coverage according to context, but actually 100% based on schema inspection). The tool description adds no additional parameter meaning, so it meets the baseline expectation without enhancing understanding.

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 a server address for owner cover upload, which is specific and actionable. However, it does not clarify that 'owner cover' pertains to a community (as indicated by the group_id parameter), and it could be distinguished from siblings like vk_photos_get_owner_photo_upload_server.

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 vs. alternatives, such as other upload server tools in the sibling list. There is no mention of prerequisites or typical use cases (e.g., that it's part of a multi-step upload process).

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