mpng

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

With no annotations, the description must disclose behavioral traits. It only states the action but omits details such as file naming, output location, overwrite behavior, or whether it clears previous frames. The minimal statement leaves significant unknowns for the agent.

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 very short (8 words) but lacks substantive content. While concise, it fails to provide necessary information, making it borderline under-specified rather than efficiently front-loaded.

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?

Despite having an output schema (unspecified here), the description does not address what the tool returns or how the series is generated. The context of 'movie frames' is vague, and without details on frame count or sequence, the description is incomplete for a tool with one parameter and simple siblings.

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?

The lone parameter 'prefix' lacks any description in the schema (coverage 0%). The tool description does not explain how the prefix is used in the series, leaving the agent without guidance on its meaning or valid values.

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's function: saving a series of PNG images for movie frames. The verb 'saves' and resource 'series of PNG images' are specific, and the context 'for movie frames' distinguishes it from the sibling 'png' which likely saves a single image.

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 no guidance on when to use this tool versus alternatives like 'png' or 'save'. There are no prerequisites, when-not-to-use instructions, or mentions of sibling tools.

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