card_builder_upload_image_from_url

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

With no annotations, the description carries full burden. It discloses the fallback behavior for filename derivation and states the tool downloads and uploads. It doesn't cover size limits, authentication, or error handling, but the key behavioral aspects are transparent.

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?

Three sentences with no fluff: first sentence states core operation, second gives use cases, third notes fallback behavior. Front-loaded and efficient.

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 sibling tools for media upload, the description covers key aspects. It could mention supported formats or access requirements, but the output schema (present) likely covers return values. Adequate for the tool's complexity.

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 0%, so description must compensate. It only hints at filename derivation from URL path but does not explain the 'filename' parameter's purpose or the 'path' parameter at all. Both optional parameters remain unclear.

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 'Download an image from any HTTP(S) URL and upload it to the Card Builder media library', specifying the exact action and resource. It distinguishes itself from sibling upload tools like card_builder_upload_media (likely for local files) by emphasizing URL-based download.

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?

Provides two concrete use cases: when a marketplace card misses a background image and for reusing images from a public CDN. While it doesn't explicitly state when not to use it, the scenarios give clear guidance on appropriate contexts.

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