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launchChrome

Launch a Chrome browser instance with debugging support, configurable with headless mode, viewport dimensions, and extra Chrome flags for automation.

Instructions

Launch Chrome with debugging

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
urlNoURL to open (default: blank page)
portNoThe debugging port (optional, defaults to this session's reserved port). Use this to launch multiple Chrome instances on different ports.
widthNoViewport width in pixels (optional). If set, the browser viewport will be resized after launch.
heightNoViewport height in pixels (optional). If set, the browser viewport will be resized after launch.
headlessNoLaunch in headless mode (no visible window, prevents focus stealing). Default: false
referenceNoConnection reference name (3 descriptive words). If not provided, defaults to "unnamed-connection-default". Use this to identify the connection when calling other tools.
chromeArgsNoExtra Chrome command-line flags to pass through at launch, e.g. ["--use-fake-device-for-media-stream", "--use-fake-ui-for-media-stream"]. Merged after the managed defaults. The CDP_TOOLS_EXTRA_CHROME_ARGS env var (space-separated) is also always merged. Only applies when this call actually launches Chrome (ignored when an existing instance on the port is reused).
autoConnectNoAutomatically connect debugger after launch
forceNewInstanceNoAlways spawn a fresh Chrome process on a new port instead of reusing/tabbing into an existing instance
Behavior2/5

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

With no annotations provided, the description must disclose behavioral traits. It only states the action without mentioning key behaviors like potential focus stealing, reuse of existing instances, or the need for specific permissions. This is insufficient for a tool that launches a browser.

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 that is concise and front-loaded. It earns its place by stating the core purpose without unnecessary words, though it could benefit from slight expansion.

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?

Given the tool has 9 parameters and no output schema, the description is incomplete. It omits details about post-launch behavior, connection management, and return values. The schema covers parameters but the behavioral flow is missing.

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%, so the input schema already documents all parameters well. The description adds no additional meaning beyond the schema. Baseline of 3 is appropriate as it doesn't detract but doesn't add value.

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

Purpose4/5

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

The description 'Launch Chrome with debugging' clearly states the verb (launch) and resource (Chrome with debugging). It is specific enough to convey the basic action, though it does not differentiate from sibling tools like connectDebugger or killChrome.

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?

The description provides no guidance on when to use this tool versus alternatives (e.g., connectDebugger, killChrome). There is no mention of prerequisites, when not to use, or comparison with sibling tools.

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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