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babelwrap

io.github.soulfir/babelwrap-mcp

by babelwrap

babelwrap_press

Press a specified keyboard key on the active web browser page to trigger actions like navigation or form submission.

Instructions

Press a keyboard key on the current page.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
session_idYesThe active session ID.
keyYesThe key to press (e.g. "Enter", "Tab", "Escape", "ArrowDown").
compactNoIf True, return a compact snapshot with minimal whitespace.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior2/5

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

With no annotations provided, the description bears full responsibility for behavioral disclosure. It only states the basic action but omits important details: whether the press triggers standard browser events, requires element focus, supports modifier keys, or handles invalid keys. This lack of transparency could lead to incorrect usage.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single sentence with no unnecessary words. It efficiently conveys the core action and context. Every word earns its place.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The description is minimal but covers the basic purpose. Though an output schema exists and reduces the need to explain return values, the description lacks behavioral context (e.g., page interaction details) that would aid correct usage. It is adequate but not thorough.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%: all three parameters (session_id, key, compact) have descriptions. The tool description adds no extra meaning beyond what the schema provides, so it meets the baseline. However, it could hint at the key format or examples beyond the schema's enumeration.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action: 'Press a keyboard key on the current page.' It uses a specific verb and resource, making it unambiguous. Among sibling tools like babelwrap_click (mouse) and babelwrap_fill (text input), the purpose is distinct and easily understood.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies when to use the tool (for keyboard key presses) but provides no guidance on when not to use it or alternatives. For example, it does not mention that typing text should use babelwrap_fill, or that complex key sequences might need separate actions.

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

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