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Chrome Course MCP

Chrome Course MCP

by CrispyW0nton
OverviewSchemaSourceRelated ServersDiscussionsAdmin
JavaScript
Local

chrome_tabs

List open Chrome tabs via the local DevTools Protocol endpoint. Use this to find and select the correct tab for collecting course materials.

Instructions

List Chrome tabs exposed by the local Chrome DevTools Protocol endpoint.

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "chrome_tabs"
  }
}

Input Schema

NameRequiredDescriptionDefault
debugUrlNohttp://127.0.0.1:9222

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

A3.5/5.0
Behavior3/5

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

With no annotations, the description carries the burden of behavioral disclosure. 'List' implies a read-only operation, and the CDP endpoint mention provides some mechanism context, but prerequisites, potential failures, and output format are not disclosed.

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?

A single, tightly crafted sentence that conveys the core functionality without any fluff or repetition. It is appropriately concise for a straightforward tool.

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 tool is simple (one optional param, no output schema), but the description is minimal. It explains what is listed and the source, but lacks details about the return structure or operational requirements, making it barely adequate for reliable invocation.

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 0%, so the description must compensate. It indirectly references the endpoint (debugUrl) but does not explicitly explain the parameter's purpose or format, leaving the agent to infer the connection.

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 lists Chrome tabs via the local Chrome DevTools Protocol endpoint, using a specific verb ('List') and resource ('Chrome tabs'). This distinguishes it from sibling tools that perform actions like opening, navigating, or screenshotting.

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

Usage Guidelines2/5

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

No guidance is provided on when to use this tool versus alternatives. The description does not mention prerequisites (e.g., Chrome must be running with a debug port) or any exclusions, leaving the agent to infer usage context.

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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