playbar_control

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

With no annotations, the description carries the full behavioral burden, and it discloses almost nothing: it does not say what 'reverse' means (play backwards, toggle direction, or step), whether playback is global or scoped, or whether stopping resets the current frame. The only behavioral signal is that this mutates playback state, which is thin for a state-changing 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?

A single short sentence with the resource stated first and the action set enumerated, so nothing is buried. Its brevity is efficient rather than padded, though it tips into under-specification rather than crisp precision.

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 three-parameter, annotation-free tool with no output schema, the description should explain the optional fps/real_time parameters and the semantics of each action. It covers only the action names, leaving an agent unable to call the tool correctly with the optional parameters or predict the effect of 'reverse'.

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% for three parameters. The description implies valid values for the required `action` but does not state exact casing or the full accepted set, and it never mentions `fps` or `real_time` at all, leaving their meaning and interaction entirely undocumented.

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 ('Control playback') and enumerates the three intended actions (play, stop, reverse), so an agent can tell what the tool does without opening the schema. It stops short of 5 because it doesn't distinguish this from any other playback-related capability or state what the tool acts on (a player, a timeline, a node).

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 when-to-use context is given: nothing about when playback control is appropriate versus, say, cooking a frame range or stepping frames. There are no stated prerequisites or side conditions (e.g., whether a player must exist first). The action list hints at usage but provides no selection guidance.

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