キータップ(1フレーム)

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

Annotations are minimal (only openWorldHint: false). Description discloses key behavioral traits: 1-frame press, triggers keyPressed() once, does not hold. However, it omits potential side effects (e.g., impact on other input handlers) or authorization needs.

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?

Two sentences, front-loaded with action and purpose. Every sentence adds value; no filler. Efficient and clear.

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 simple one-parameter tool with output schema (not shown), description covers purpose, usage context, parameter type, and behavioral constraint. Complete for this complexity level given annotations.

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 100% with description for 'key'. Description adds little beyond schema: it repeats that key is VK integer or name and gives an example (SPACE). No added parameter semantics beyond the schema.

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?

Description clearly states the action (press and release a key for 1 frame), resource (key), and duration, distinguishing it from siblings like key_down/key_up by stating 'Does not stay pressed.' Verb and resource are specific and unambiguous.

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?

Provides usage context: 'For checking tap operations like jump (SPACE)' and explains it is a momentary press. Missing explicit contrast with dx12_key_down/dx12_key_up alternatives, but 'does not stay pressed' implies the difference.

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