playbar_control

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

With no annotations, the description carries the full burden of behavioral disclosure. It only lists actions without explaining side effects (e.g., whether 'play' starts playback, whether 'stop' resets to frame 0, if it returns anything). This is minimal disclosure, leaving key behavioral traits unspecified.

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 a single concise sentence that front-loads the resource ('Control playbar') and then lists actions. It has no filler and is appropriately sized for a simple tool. It could be slightly more precise, but it earns a high score for efficiency.

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 one-parameter tool with no output schema and no annotations, the description is thin. It does not state whether the action values are exact strings, what the return value is, or any side effects on the playbar state. This leaves significant gaps for an agent trying to use the tool correctly.

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 schema provides only a generic 'action' string with no enum or description. The description compensates by enumerating the allowed values (play, stop, reverse, step_forward, step_backward), giving the agent some idea of valid inputs. However, it does not elaborate on the meaning or effect of each action, so the compensation is partial.

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 the tool controls the playbar and lists specific actions (play, stop, reverse, step_forward, step_backward). This clearly identifies the resource and the operations, distinguishing it from sibling tools like set_frame or set_playback_range. However, the verb 'control' is a bit generic; a more precise verb like 'change playback state' would strengthen it.

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 guidance is provided on when to use this tool versus alternatives. For example, it does not clarify whether to use this for play/pause actions versus set_frame for scrubbing. There are no exclusions or mention of related tools, leaving the agent without context for tool selection.

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