playbar_control

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

With no annotations, the description carries the full burden, but it only lists argument meanings. It doesn't disclose side effects (e.g., whether reverse changes direction or jumps), state changes to current playback, or reversibility of actions—important for a mutating control 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?

Description is two lines of purpose followed by a tight Args block; no filler. It is front-loaded with the core action set and each parameter earns its line.

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 tool with one required parameter and no output schema, the action values and parameter meanings are largely sufficient. However, it omits default behavior of optional params and any notes on playback state effects, so an agent's understanding is minimally adequate but not complete.

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 coverage is 0%, so the description compensates by defining all three parameters: action values, real_time enable/disable, and fps as frames per second. It doesn't document null defaults or relationships (e.g., whether fps applies only in real-time), keeping this from a 5.

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?

States a concrete verb and resource: 'Control playback' with enumerated actions play/stop/reverse. This makes its scope clear against siblings like set_frame and set_playback_range, though it doesn't explicitly name the alternatives.

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 description of when to choose playbar_control over set_frame, set_frame_range, set_playback_range, or other playback-related tools. It gives no prerequisites, exclusions, or alternative routing; guidance is only implied by the action list.

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