play_simulation

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It only says 'Start the physics simulation,' which conveys a state change but does not describe side effects, whether the call is idempotent, whether it blocks until running, or what happens if no simulation is loaded.

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 extremely concise and front-loaded, with no wasted words. However, the brevity crosses into under-specification, so while structure is clean, it does not serve the agent's decision-making adequately.

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 simulation control tool with two optional parameters and no annotations, the description is incomplete: it lacks prerequisities, alternation guidance, behavioral effects, and parameter meaning. The presence of an output schema reduces some burden around return values, but the missing operational context is material.

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% and the description provides no explanation for command_id or idempotency_key. An agent cannot infer what these optional parameters mean or how they affect the invocation. The description does not compensate for the schema gap at all.

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 a clear action ('Start') and a specific resource ('the physics simulation'), which is enough to understand the tool's basic role. It is distinct from obvious siblings like pause_simulation, stop_simulation, and step_simulation, though it does not explicitly clarify whether 'play' means resume or start from an initialized scene.

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 given about when to call this tool versus alternatives, or what prerequisites must be met before calling it. The sibling names imply a simulation lifecycle, but the description never states that a physics scene must already exist or that this should be called after creating a scene.

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