video_timeline_ir_validate

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

No annotations are provided, so the description carries the full behavioral burden. It says the tool validates and compiles, and that semantic timelines produce agent-visible text, but it does not disclose what a validation failure looks like, whether the operation is read-only or mutating (compiling to a DAG could be either), whether it consumes resources, or what the output schema contains. The 'P3.0' and 'N2' references are unexplained internal tags.

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 poorly structured: it front-loads an unexplained internal code 'P3.0' and ends with a cryptic parenthetical about 'N2'. Two sentences, but neither is self-contained, and the internal jargon wastes the limited space that should explain the tool.

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?

An output schema exists, so return values need not be explained. However, with a nested, undocumented required parameter, no annotations, and a compound behavior (validate + compile), the description leaves critical information missing: what the input timeline looks like, what compilation means, and how this validate differs from the many other validate 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?

There is one required parameter, 'timeline', with schema description coverage of 0% — the schema only says it is an object with additionalProperties true and gives no hint of expected shape. The description does not compensate: it never explains what a Timeline IR object should contain, what fields are required, or what semantic vs. non-semantic timelines look like structurally. This is a genuine gap that will cause invocation errors.

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 states a verb ('validate') and a resource ('Timeline IR') and adds that it compiles to a render DAG, which is clear enough on its own. But it doesn't distinguish this tool from siblings like video_cutfile_validate, video_workflow_validate, or sound_plan_validate, nor does it explain what 'Timeline IR' is in this ecosystem. An agent would struggle to know when this validate applies versus the other validate tools.

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?

There is no explicit when-to-use guidance, no mention of prerequisites (e.g., that a timeline must first exist), and no routing to or from related tools like video_semantic_timeline or video_timeline_edit_plan. The mention that semantic timelines 'also get agent-visible text (N2)' hints at a behavioral mode but does not tell the agent when to prefer this tool.

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