browser_press_key

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

With no annotations the description carries the full burden, and it does disclose two valuable traits: it 'may submit forms' (a side effect) and it has 'no retry.' It stops short of describing return behavior, focus prerequisites, or failure modes, leaving meaningful gaps for a keyboard-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?

Dense and front-loaded: purpose first, then key vocabulary, then modifiers, then the side-effect/no-retry warnings. Every clause carries information; it is terse but not padded.

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 3-param tool with no annotations, no output schema, and 0% schema coverage, it covers the essentials (purpose, key set, modifiers, form side effect, no retry). It still omits return behavior and precise focus/ref semantics, so it is adequate rather than 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 must compensate and largely does: it enumerates valid `key` values plus the single-printable-character rule, and explains `modifiers` (unique CONTROL/ALT/SHIFT). `ref` is characterized as a fresh/visible/enabled reference, adding meaning, though the reference format itself remains unstated.

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 (send a key) and resource (a key to an element reference), plus target constraints: fresh, visible, enabled, excluding file inputs. This differentiates it reasonably from browser_fill (text) and browser_click, though it never names a sibling 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?

Implied usage is clear (keyboard input to a focused element), and 'excluding file inputs' plus the visible/enabled requirement give applicability cues. But it never says when to prefer this over browser_fill or browser_click, nor names alternatives.

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