capture_animation

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

No annotations are provided, so the description must disclose behavioral traits. It states it captures frames sequentially and returns screenshots, but does not mention whether the operation is read-only, destructive, requires specific permissions, or has rate limits. For a capture tool, safety and idempotency are not addressed.

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-loads the purpose, and each sentence adds value. It is efficient but could be slightly more structured or include a brief example.

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 the tool has 6 parameters and no output schema, the description explains the output (sequential screenshots) and use case, but lacks details on return format (e.g., data URIs), limits on frames/duration, and prerequisites for input code. It is adequately complete but not fully comprehensive.

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 100%, so the baseline is 3. The description adds context about verifying animation behavior but does not enhance understanding of individual parameters beyond what the schema already provides.

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 captures multiple frames of CSS animations/transitions and returns sequential screenshots to verify behavior, timing, and smoothness. It specifies the verb 'capture' and resource 'CSS animation', distinguishing it from sibling tools like screenshot_url (static) or render_interaction (interaction recording).

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 mentions the use case (verify animation behavior, timing, smoothness) but lacks explicit guidance on when to use this tool versus alternatives, such as when to choose capture_animation over render_interaction or screenshot_url. No prerequisites or exclusions are provided.

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