act

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It only hints at performing actions ('execute') but does not state side effects, permissions, reversibility, or what happens to the session. This is a significant gap for a tool that likely mutates state.

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 short (one sentence), but this is under-specification rather than effective conciseness. There is no front-loading of critical information because none is provided. It is not appropriately sized for a tool with four parameters and a complex behavior.

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 that combines observation and execution, with no output schema and no annotations, the description is grossly incomplete. It does not explain how the plan is derived, what the output looks like, or how it interacts with sessions and leases. An agent cannot call this correctly based on the description alone.

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%, so the baseline is 3. The description adds no extra meaning to the parameters (intent, llm, lease, session); it does not explain their roles or relationships beyond what the schema already documents.

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 'Observe + execute the resulting plan in one shot' is abstract and does not specify a concrete resource or action. It implies a meta-operation combining observation and execution, but it is unclear what 'observe' and 'execute' refer to, and it does not differentiate from siblings like observe, click, or fill. The purpose is too vague to guide an agent.

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 instead of alternatives. It does not mention conditions, prerequisites, or exclusions, leaving the agent without any basis to choose between 'act' and the many other tools for observation or action.

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