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

With no annotations, the description carries the behavioral burden. It does disclose a key trait: 'Writes a new file', which suggests a non-destructive output model. However, it does not describe failure behavior, prerequisites, permissions, or whether the original file is left untouched, so the disclosure is only partial.

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 purpose, immediately states the key side effect, and then lists all supported actions. The action list is long but useful; no sentences are wasted, though the list partially duplicates the enum in the schema.

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?

This is a complex tool with 15 actions, a generic nested args object, no output schema, and no annotations. The description covers the operation set and the new-file side effect, but it leaves per-action argument requirements, output location, and return behavior unexplained, which is a significant gap for correct 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 100%, so a baseline of 3 applies. The description adds an example of args ('filepath') and names the action enum, but it does not explain what arguments each specific action needs beyond the generic 'args' object.

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 a specific verb and resource ('Change clips on the timeline') and enumerates concrete operations, so an agent understands exactly what this tool does. The action list also separates it from read-only or output-oriented siblings like inspect, preview, and deliver.

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 implies when to use it: whenever timeline clip edits are needed. It does not explicitly contrast it with sibling tools or state when not to use it, leaving the routing decision mostly to the action names and general intent.

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