nex_browser_key_up

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

With no annotations provided, the description carries full burden for behavioral disclosure. It only states the action without detailing side effects (e.g., sends a keyup event), behavior when the key is not held, or scoping to a page/session. This is a significant gap for a mutation tool.

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 consists of one concise sentence with no redundant information. It is front-loaded and every word earns its place, achieving maximum conciseness.

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?

The tool is simple, but given no annotations and no output schema, the description should cover prerequisites (must be preceded by key_down), relation to press_key, and state implications. The description only provides minimal context, leaving the agent to infer critical usage details.

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 67% (pageId and sessionId have descriptions), but the required 'key' parameter lacks a description. The tool's description adds minimal semantic meaning by implying the key is the one to release, but it does not clarify the expected format or consistency with key_down.

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 specifies the action ('Release') and the resource ('a keyboard key held by nex_browser_key_down'). It distinguishes itself from sibling tools by explicitly referencing its complementary counterpart, making the purpose 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?

The description implies usage after nex_browser_key_down but provides no explicit guidance on when to use this tool versus alternatives like nex_browser_press_key. It does not state exclusions or prerequisites, leaving the conditions for use implied.

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