add_bars_and_tone

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

No annotations are provided, so the description carries the full disclosure burden, and it discloses nothing beyond the action. It does not say whether the bars land at the playhead or the given startTime, whether existing material is overwritten or rippled, whether audio tone requires an audio track, or whether the operation is undoable. For a timeline-mutating tool with zero annotation coverage this is a real gap.

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 tight sentence with no filler, and the action is front-loaded. It is efficient, though efficiency here partly reflects under-specification rather than disciplined editing.

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?

Three fully-documented required parameters and no output schema make this a simple tool whose structural fields cover the mechanics. What is missing is the behavioral layer — overwrite semantics and track-type requirements — which matters for an unannotated mutation on a live timeline.

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 100% — units (seconds) and the meaning of trackIndex are already documented in the schema — so the baseline is 3. The description adds no constraint such as track-type validity or start-time behavior, so it earns nothing above baseline.

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?

Specific verb (add) plus a specific resource (color bars and tone) and destination (the timeline). This distinguishes it from nearby siblings such as add_color_matte, add_black_video, and add_universal_counting_leader, though it never names those 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 indication of when this should be used versus the other synthetic-media generators in the sibling list, no prerequisites (active sequence required?), and no exclusions. The agent must infer everything about selection context.

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