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jssyxd

Puppeteer MCP Server

by jssyxd

puppeteer_connect_active_tab

Connect to an existing Chrome browser instance for remote debugging, optionally specifying a target tab by URL.

Instructions

Connect to an existing Chrome instance with remote debugging enabled

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
debugPortNoOptional Chrome debugging port (default: 9222)
targetUrlNoOptional URL of the target tab to connect to. If not provided, connects to the first available tab.
Behavior2/5

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

No annotations are provided, and the description does not disclose what happens if connection fails, whether state changes, or prerequisites (e.g., Chrome must already be running with remote debugging).

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

Conciseness4/5

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

The description is a single sentence with 10 words, efficiently conveying the core purpose without unnecessary details.

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

Completeness2/5

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

With no output schema and no annotations, the description is too brief for a connection tool. It lacks information about return values, success/failure indicators, and prerequisites for using the tool.

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?

Input schema coverage is 100% and already includes parameter descriptions. The tool description adds no additional behavioral details beyond what is in the schema, so baseline score of 3 is appropriate.

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 ('Connect') and resource ('existing Chrome instance with remote debugging enabled'), distinguishing it from sibling tools that perform page manipulations.

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 on when to use this tool versus alternatives, such as launching a new browser. It does not indicate it is a prerequisite for other puppeteer 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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