close_gripper

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

Annotations already flag destructiveHint=true and non-idempotent behavior, so the safety bar is partly covered elsewhere. The description adds two genuinely useful traits beyond that: the motion is 'slowly' and the target is an 'operator-verified safe position'. It still omits the consequence of the destructive hint (crushing the grasped object), whether the call blocks until motion completes, and what happens if no verified safe position exists.

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 front-loaded sentence with no filler. The one weakness is that 'operator-verified safe position' is dense but undefined, leaving ambiguity inside an otherwise tight sentence.

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 zero-argument action tool with no output schema, the annotations carry the safety profile, but the description should explain what closing implies (blocking motion, crush risk, unknown state if already closed). It covers the target and speed but leaves the agent guessing about the outcome of a destructive, open-world action.

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 tool takes zero parameters, so there is nothing for the description to disambiguate; baseline is 4. The only semantics worth clarifying would be implicit inputs such as the safe pose source, which the description gestures at but does not define.

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?

States a specific verb (close) and resource (gripper) plus a qualifier about the target position. It is distinguishable from open_gripper and cycle_gripper by the verb alone, though it never explicitly names or contrasts those siblings.

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 statement of when to prefer this over cycle_gripper or open_gripper, and no preconditions (e.g., object grasped, safe pose already recorded) are given. Usage must be inferred entirely from the name.

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