start_stop_play

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

With no annotations, the description carries the full behavioral disclosure burden, but it only says 'starts or stops.' It does not mention pause/resume behavior, effect on the current session, required Studio state, or return behavior, so key side effects are undisclosed.

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 one short sentence with no filler, and the core action is front-loaded. It earns this score through efficiency, though it sacrifices context.

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 tool with four parameters, no annotations, and no output schema, this description is too sparse. It does not explain parameter combinations, optionality, target Studio selection, or whether pause/resume are supported despite being in the schema.

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?

The schema already describes all four parameters, so the baseline is 3. The description adds no extra parameter-level meaning, such as how mode/action/is_start relate or whether studio_id is needed.

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 a specific action ('Starts or stops') and a specific resource ('Studio playtest simulation'), so an agent can tell what the tool does. It does not differentiate it from sibling tools like playtest_control or playtest_run_scenario, so it falls short of a 5.

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?

There is no guidance on when to use this tool versus playtest_control, playtest_get_state, or playtest_run_scenario. The description only names the general capability, leaving the agent to infer when it is the right choice.

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