estimate_skeleton

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

With no annotations, the description must disclose behavior but only states the basic function. It does not mention whether the tool is synchronous or asynchronous, what the output format is, whether it consumes resources, or any side effects (e.g., no destructive hint). The agent is left guessing about the tool's execution model and return value.

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 a single, front-loaded sentence with no redundant words. Every word adds value, and it is highly scannable.

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 simple tool with one parameter, the description is adequate but incomplete. It does not explain what 'skeleton keypoints' are or what the output looks like, which could be critical for the agent to correctly process the result. The absence of an output schema makes this gap more significant.

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%, so the description does not need to repeat parameter details. However, it adds no additional meaning beyond the schema's 'Character image' description. The baseline score of 3 is appropriate as the description is sufficient but not enhancing.

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 ('Estimate'), the resource ('skeleton keypoints'), and the input source ('from a character image'). It effectively distinguishes from sibling tools like 'animate_with_skeleton' which uses skeleton data rather than estimating it.

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?

No guidance is provided on when to use this tool versus alternatives, such as when to estimate skeleton keypoints before animation or when other body estimation tools might be more appropriate. Prerequisites or post-processing steps are not mentioned.

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