timeline_assemble

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 mentions the high-level actions (ensure, import, place) but does not state whether the operation is destructive, whether existing timeline content is cleared or merged, whether it is idempotent, or what side effects media import may have. This is a significant gap for an orchestrating mutation tool.

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 brief and front-loaded with the core action, then summarizes the benefit. It wastes no words, though terms like 'ensure' and 'rough cut' are somewhat ambiguous without domain context.

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 combines multiple operations, but the description does not explain key contextual details: what happens if the timeline already exists, whether clips are appended or replaced, how optional import interacts with placement, or what constitutes a valid rough cut. The output schema may cover return values, but the operational semantics are under-specified for reliable invocation.

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 0%, so the description must compensate, but it only loosely hints at the parameters: 'import media' suggests paths, and 'place clips' suggests items. It never explicitly maps paths to media files or items to clip objects, leaving the agent to infer how to populate the arguments correctly.

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 combined role: ensuring a timeline, optionally importing media, and placing clips to produce a rough cut. It distinguishes itself from siblings like timeline_ensure and timeline_place by advertising a one-call assembly workflow, though it does not name those alternatives explicitly.

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 phrase 'Rough cut in one call' implies this tool is for a consolidated assembly workflow rather than using separate ensure/import/place calls. However, it does not explicitly state when to prefer this tool over the individual sibling tools, nor does it describe exclusions or edge cases such as when not to use it.

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