transport_play_region

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It mentions the core action and the start-position behavior, but it does not disclose whether the current selection is changed, whether ongoing playback is stopped, how invalid ranges are handled, or whether any state is modified beyond playback.

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 and front-loaded: the main behavior is stated in the first sentence, followed by a compact parameter list. Every sentence adds necessary information with no filler.

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 simple two-parameter transport tool, the description is mostly adequate, but with no annotations and no output schema it leaves some important context unstated, such as interaction with existing playback and whether the region selection becomes the active selection. An agent could still invoke it correctly, but a bit more clarity would improve confidence.

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 input schema only provides parameter names and types, while the description adds needed semantics: start and end are in seconds, and end must be >= start. This meaningfully compensates for the 0% schema description coverage, though it leaves out details like whether end is exclusive or whether bounds are validated against project length.

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 operation: select a time region and play it starting from its beginning. It identifies the resource (time region) and the behavior, which distinguishes it from generic transport commands like transport_play. However, it does not explicitly contrast itself with sibling 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?

The intended usage is implied: use this when you want to play a specific time range from its start. There is no explicit guidance on when not to use it or which sibling tool to prefer instead, such as transport_play for normal playback.

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