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visual-inspector-mcp

visual-inspector-mcp

by MatinMHF
OverviewSchemaSourceRelated ServersDiscussionsAdmin
JavaScript
Local

Type text (per-keystroke)

type

Type text into input fields that require real keystrokes, firing key events per character. Optionally clear the field before typing.

Instructions

Type into a field one key at a time (Playwright locator.pressSequentially), firing a keydown/keypress/keyup per character — for inputs whose handlers need real keystrokes and don't react to fill. Set clear to empty the field first.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "selector": "<selector>",
      "text": "<text>"
    },
    "name": "type"
  }
}

Input Schema

NameRequiredDescriptionDefault
textYesText to type
clearNoClear the field before typing (default false)
delayNoDelay in ms between keystrokes (default 20)
selectorYesCSS selector or Playwright locator of the field

Schema Changelog

Changes observed during successful MCP inspections.

  1. Addedv1.1.0

TDQS

A4.2/5.0
Behavior4/5

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

Annotations indicate the tool is not read-only (readOnlyHint=false) and not destructive. The description adds important behavioral detail: firing keydown/keypress/keyup per character and using pressSequentially. It also clarifies the 'clear' parameter behavior. No contradiction with annotations.

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?

Two sentences: first defines purpose and mechanism, second explains the 'clear' parameter. No superfluous words. Information is front-loaded and efficient.

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

Completeness4/5

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

Given no output schema, the description adequately covers behavior and key parameter. It mentions the delay parameter implicitly via the mechanism. Could mention focus behavior or error handling, but for a simple action tool, it is sufficiently complete.

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 coverage is 100% with descriptions for all 4 parameters. The description adds a brief note about 'clear' emptying the field, which overlaps with the schema description. Baseline 3 is appropriate as it adds marginal value beyond the schema.

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 tool types text per-keystroke using Playwright's pressSequentially, and explicitly distinguishes itself from the sibling 'fill' tool by specifying the use case for inputs requiring real keystrokes. Verb 'Type' with resource 'field' and mechanism is specific.

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

Usage Guidelines4/5

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

The description provides explicit context for when to use: for inputs with handlers needing real keystrokes that don't react to fill. It implies fill as an alternative but does not explicitly list when not to use or exclude other siblings like 'press' or 'click'.

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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