render

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

With no annotations, the description carries the full burden, and it discloses substantial behavior: preset codecs, overlay clamping and warnings, captions burned after composition, two-pass loudness normalization, and measured return values. It omits some operational side effects, such as overwrite behavior and likely processing cost, but the core behavior is well explained.

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 front-loaded with the primary action and then covers presets, layers, captions, timeline stills, loudness, and returns in one dense paragraph. Every clause carries information, but the single-block structure and long parentheticals make it harder to scan than it could be.

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 12-parameter tool with nested objects, no annotations, and no output schema, the description is substantially complete: it explains presets, composition layers, captions, timeline behavior, loudness normalization, and return fields. The main gaps are operational details such as overwrite semantics and processing cost, which the schema only partially covers.

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 schema already documents the parameters thoroughly. The description adds conceptual grouping and some cross-parameter behavior, such as layers being timed, stacked, and clamped, but it does not need to compensate for schema gaps and mostly restates the structured model.

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 uses specific verbs and resources: encoding a file, assembling a timeline, applying a fixed delivery preset, compositing layers, burning captions, and normalizing loudness. It clearly distinguishes the tool from a simple transcoder, but it does not explicitly separate it from siblings such as compose, trim, cut, or captions.render.

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 opening phrase implies usage contexts: encoding with a fixed delivery preset or assembling a timeline. However, there is no explicit when-to-use guidance, no when-not-to-use guidance, and no named alternatives among the many sibling tools. The agent must infer the routing decision from the feature list.

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