td_timeline_set

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

Annotations indicate readOnlyHint=false (modifies state) and idempotentHint=true (safe to repeat). The description's 'Control' aligns with mutation. No contradictions, but it adds no behavioral context beyond what annotations provide, such as whether changes are reversible or persistent.

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 sentence of 8 words, perfectly front-loaded, and contains no fluff. Every word is necessary and contributes to clarity.

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?

Given the tool has an output schema and moderate complexity, the description covers the core functionality adequately. It could mention that actions are passed via the 'action' parameter, but the schema already does that. Overall, sufficient for a simple control tool.

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 100% with each parameter having a description. The description adds only high-level context (play/pause, frame, FPS) that largely repeats the schema. It does not provide additional meaning or usage tips beyond what the schema already conveys.

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 clearly states the tool controls timeline playback with specific actions: play/pause, jump to frame, set FPS. It names the resource (timeline playback) and the verb (control), making it easy to understand. However, it does not explicitly differentiate from the sibling tool 'td_timeline', which might serve a related but distinct purpose.

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?

The description implies usage scenarios (play/pause, jump, set FPS) but provides no explicit guidance on when to use this tool versus alternatives, or when not to use it. It assumes the agent knows the context of timeline playback control.

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