create_image_from_url

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

No annotations exist, so the description must carry this burden. It discloses server-side fetching and native image sizing unless dimensions are given, but omits details on URL validation, failure handling, authentication needs, or size limits. The behavior is partially transparent but lacks important safeguards.

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?

Two sentences with no redundancy, efficiently front-loading the core action and size behavior. Every word adds value, making it a model of conciseness.

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 no output schema, the description should hint at return value (e.g., created node ID). It covers the operation well but omits output details and doesn't contrast with siblings like 'create_node'. The explanation of size behavior partially compensates.

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?

With only 14% schema description coverage, the description adds minimal value: it explains that width/height default to native size, but does not clarify x, y, name, or parentId. The url parameter description already exists in schema. This is insufficient for a 7-parameter tool.

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 tool fetches an image from a URL server-side and places it as a rectangle with image fill on the canvas, using examples like screenshots and logos. This specific verb+resource pairing effectively distinguishes it from siblings like 'create_icon' or 'create_node'.

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 examples of when to use (reference screenshots, logos, photos) but does not explicitly contrast with alternatives like 'create_icon' or export functions. Guidance on when not to use or prerequisites is absent, leaving the agent to infer usage context.

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