get_group_file_url

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

No annotations are provided, so the description carries the full behavioral burden. It implies a read operation and that the result is a direct HTTP link, but says nothing about auth/permission requirements, link expiry, or failure modes when a file is unavailable.

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 purpose is front-loaded in one clear sentence, but the three ':param' lines duplicate schema content that is already fully documented, so a portion of the text does not earn 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?

For a 3-param URL-retrieval tool with full schema coverage but no annotations and no output schema, the description is minimally adequate. It omits what the returned link looks like and when the call fails, which an agent would benefit from knowing.

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%, so the baseline is 3. The ':param' lines merely restate the schema descriptions verbatim (群号, 群文件 ID, busid optional default 102), adding no syntax or format detail beyond the structured fields.

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?

States a specific verb (获取/get) and resource (群文件的直接 HTTP 下载链接/direct HTTP download link of a group file), which is unambiguous. It does not explicitly differentiate from the sibling get_private_file_url, but the 'group' scope is clear from the name and text.

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?

There is no guidance on when to use this versus get_private_file_url or get_group_root_files, nor any prerequisite (e.g. that a file_id must first be obtained from a listing call). Only the purpose is given.

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