upload_content_image

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

Annotations already indicate this is not read-only, not idempotent, and has an open-world effect, so the description does not need to restate the mutation aspect. It adds that the upload is local and returns a WeChat URL, but it does not disclose potential limitations, persistence, or side effects beyond the annotation hints.

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 front-loaded sentence: action, resource type, format, and result are all conveyed without wasted words. Every clause contributes to understanding.

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 tool with one required string parameter and an output schema present, the description covers the essential call intent and return type. It is slightly incomplete in not addressing usage boundaries relative to sibling upload tools or any file constraints beyond JPG/PNG, but these gaps are minor for this simple interface.

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?

Input schema coverage is 0%, so the description must carry the semantic weight for file_path. It does so by specifying that the file is a local JPG/PNG image, which clarifies that file_path should point to a local image file. It does not mention size limits or path format, but with only one parameter this is reasonably sufficient.

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 states a specific action ('upload'), the exact resource ('local JPG/PNG body image'), and the expected result ('return WeChat image URL'). This clearly differentiates it from sibling tools like upload_cover_image or upload_video_material.

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 type of image ('正文图片') implies when this tool is appropriate, but the description never explicitly says when to use this tool instead of upload_cover_image, upload_temp_media, or other upload variants. Usage context is inferable but not stated.

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