browser_press_key

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

With no annotations, the description carries the full behavioral burden and mostly fails it: it does not say whether the key fires default browser actions (e.g. Enter submitting a form), which element receives the event, what happens if no tab is active, or whether the operation can be undone. Only the vague 'target tab' scoping is disclosed.

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?

One front-loaded sentence with no filler; the action comes first and the key examples follow. It is efficient, though the brevity is partly the source of the missing usage and behavioral context.

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 single-parameter tool with no output schema, the description covers the basic action and key vocabulary. But it leaves the 'target tab' concept and event-delivery semantics unexplained, which are the details an agent would need to call it reliably.

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 must supply the value domain — and it does, listing Enter, Tab, Escape, ArrowUp/Down, Backspace, 'or any key name'. That is genuinely useful beyond the bare string schema, but it omits key-name format details (KeyboardEvent.key vs code, case sensitivity, modifier combinations like 'Control+A').

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 and resource: 'Send a key press to the target tab', which is clearly a keyboard-input action distinct from browser_type (text entry) or browser_click. It does not explicitly name or contrast with those siblings, and 'target tab' is left undefined, so it falls short of a 5.

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 lists example keys but never says when to use this tool versus browser_type or browser_click, nor what preconditions apply (focused tab, focused element). An agent must infer all usage context from the examples.

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