set_blend_mode

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It gives no information about side effects, whether it requires a selected clip, or whether it changes existing blend modes irreversibly. The sentence is completely uninformative.

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 short but not effectively concise; it wastes the only words on 'expanded operation' and adds no substantive content. It is an under-specified one-liner rather than a helpful, tightly-worded summary.

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 annotations, no output schema, and an empty input schema. The description must therefore provide all context, but it gives almost nothing: no target object, no blend mode values, no prerequisite selection, no result or side effects. This is completely inadequate for an operation tool.

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 schema has zero explicit parameters, and schema coverage is 100% because the schema is essentially empty. Per the rubric, 0 params receives a baseline of 4. The description does not contradict or mislead about parameters, although it also does not clarify what arguments might be accepted via additionalProperties.

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 merely restates the tool name ('set blend mode') and adds the vague qualifier 'Premiere Pro expanded operation'. It does not specify the resource (clip, track, project) or the scope, so it is essentially a tautology with no more meaning than the name itself.

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 for when to use this tool or how it relates to alternatives such as set_frame_blend, set_time_interpolation, or set_clip_opacity. There is no mention of prerequisites, selection requirements, or exclusions.

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