key

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

With only readOnlyHint=false, the description legitimately adds value by disclosing that a specific combo (Ctrl+Shift+F12) toggles the ReimaginedLC layer. However, it doesn't state what pressing keys affects generally, failure behavior, or return values, so the added behavioral context is limited.

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 sentence front-loads the action and follows with illustrative examples; every clause earns its place. Only the inline meta-comment about the ReimaginedLC toggle slightly crowds the format examples.

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 one-parameter tool with no output schema, the description is mostly adequate, but with minimal annotations it leaves return behavior and error semantics unspecified. It covers the input format but not the observable effect of the call.

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% for the single 'combo' parameter, so the description must carry the burden. It does so well by giving six representative examples ('Escape', 'Ctrl+A', 'Ctrl+Shift+F12') that convey the expected key/combo format, though it doesn't address case sensitivity or key-name conventions.

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 names a specific verb ('Presses') and resource ('a key or combo on the page') with concrete examples of valid input. It effectively distinguishes itself from a text-entry sibling like 'type' by emphasizing key combos, though it never names an alternative explicitly.

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 versus 'type', 'click', or 'script', nor any prerequisites or exclusions. The examples imply input format but convey nothing about choosing this tool over siblings.

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