Upload a local image to Fashio

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

With no annotations present, the description carries the behavioral disclosure burden. It discloses accepted formats, max file size, source location, and the output contract (a URL for create_generation). It doesn't mention URL expiry or storage persistence, but for a simple upload tool this is adequate.

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, well-structured sentence that front-loads the action and key constraints, then immediately connects the output to its downstream use. No filler or redundant explanation.

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 one-parameter tool with no output schema, the description covers everything needed to call it correctly: accepted formats, size limit, source path, and the purpose of the returned URL. The integration with create_generation provides important surrounding context.

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 100% and already indicates the filePath is an absolute path to a local image. The description adds the 8MB size cap and reinforces accepted formats, providing marginal but real meaning beyond the schema.

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 action (Upload), the resource (a LOCAL image file), and the purpose (returns a URL usable in create_generation's images.* fields). It differentiates itself from the create_generation sibling by positioning upload as a prerequisite feed for that tool.

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 description provides clear context: use it to convert a local filesystem image into a URL for create_generation. While it doesn't explicitly say 'use this instead of X', there are no uploader sibling tools, so the integration context is sufficient.

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