fusion_screenshot

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

Annotations already declare readOnlyHint=true, so the description's claim of capturing a viewport is consistent and non-contradictory. The description adds that the output is a PNG image, but does not disclose any further behavioral traits such as auth requirements, rate limits, or what happens if the viewport is empty.

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 two sentences, front-loading the purpose and then providing a key usage hint. No unnecessary words. Slightly more detail on width/height could be added without harming 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?

The tool has no output schema and 3 poorly documented parameters. The description mentions the return type (PNG image) but fails to specify the return format (e.g., base64, URL) or how the agent should process it. For a simple tool, this is a notable gap.

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 the description must compensate. It only explains the fit parameter ('Set fit=False to keep the current camera'), leaving width and height completely undocumented. The agent cannot infer what these parameters control without external knowledge.

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 verb 'Capture', the resource 'active Fusion viewport', and the outcome 'return it as a PNG image'. It unambiguously distinguishes this from siblings which mostly deal with feature creation, modification, or inspection.

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 one usage hint about the fit parameter but does not explicitly state when to use this tool versus alternatives. Since no other screenshot tool exists among siblings, the guidance is adequate but not comprehensive.

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