hid.key_release

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

With no annotations, the description carries full burden. It states idempotency and that passing no arguments releases all held keys/mouse buttons (panic stop). However, it does not specify what happens if the key is not currently held or if only some modifiers are released.

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 mostly concise but includes a bracketed usage note upfront, which adds context. The main functional description is short, but the bracketed part could be considered extraneous. Overall, it is well-structured and front-loaded.

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 simple parameter set and no output schema, the description covers when to use, idempotency, and panic stop. It lacks mentioning the return value, but that is minor. For a HID release action, it is fairly complete.

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 0%, so the description should explain parameters. It only implies that both key and modifiers are optional to release all, but does not describe what 'key' or 'modifiers' represent (e.g., which key to release, which modifiers to release). The schema has defaults but no description of their semantics.

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 releases a previously-pressed key or shortcut. It distinguishes from the sibling tool hid.release_all by noting that passing no arguments does the same thing, providing specific verb+resource with clear scope.

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 explicitly tells when to use this tool: when other automation paths fail or when the user requests physical input. It also mentions idempotency and the panic stop behavior with no arguments, guiding appropriate usage versus alternatives.

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