playbar_control

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

With no annotations, the description carries the full burden, yet it says nothing about side effects: whether playback is blocking, whether stop resets the current frame, whether real_time overrides fps, or whether state persists across calls. It only restates the action verbs.

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?

Short, front-loaded, and the Args block maps one-to-one onto the three parameters with no filler. The docstring-style formatting is slightly mechanical but costs nothing.

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, no-annotation, no-output-schema tool the description is minimally adequate: parameters are covered but behavioral traits (blocking, state effects, interaction between real_time and fps) are absent, which is the main gap an agent would need filled.

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 0%, so the description must compensate, and it does partially by enumerating the valid action strings (the schema has no enum) and glossing real_time and fps. It still omits defaults, the fps range/units, and what happens when real_time is null.

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 specific verb (control) and resource (playback) and enumerates the three actions, so an agent can tell it is the transport-control tool. It does not, however, distinguish itself from neighbors like set_frame, set_frame_range, or set_playback_range.

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 on when to use this versus the other playback-related siblings (set_frame, set_playback_range, frame_selection); the only hint is the action enum itself. The agent is left to infer that this is for starting/stopping transport while set_frame is for scrubbing.

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