upload_image_tool

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

With no annotations, the description carries the full behavioral burden, and it only discloses the return shape (hosted URL). It says nothing about auth requirements, size/format limits, which backend is used, or that the upload is a mutating external side effect.

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?

A single tight sentence with the action and result front-loaded and no filler. It is efficient, though almost too terse given the undocumented parameter set.

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?

An output schema exists so return values need not be described, but the description is incomplete for a 4-parameter tool with 0% schema coverage and no annotations, notably omitting that path and data_base64 are alternative input modes.

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 0% across 4 parameters, so the description must compensate and does not. 'Local image' vaguely gestures at path but leaves the path vs. data_base64 alternative, the mime default, and the official/web backend enum entirely unexplained.

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 and resource ('Upload a local image') and the outcome ('get a hosted URL'), which cleanly separates it from generate_image_tool. It does not explicitly name that sibling, so it falls short of a 5.

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 clause 'to use as image_url' implies the downstream context where this tool is appropriate, which is useful inferred guidance. However, there is no explicit when-to-use versus generate_image_tool, no prerequisites, and no exclusions.

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