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iamvinitk
by iamvinitk

Launch Electron app (direct binary)

launch_app

Spawns an Electron application with debugging ports enabled, allowing control of both the renderer and main process via CDP and Node inspector.

Instructions

Spawn an Electron application via the electron binary with --remote-debugging-port and --inspect flags set so the MCP can drive the renderer and main process. Use launch_via_npm instead for electron-forge projects; this tool is for apps that don't need the forge dev-server (or for packaged test builds).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
envNoEnvironment variables overlaid on the MCP process env.
nameNoDisplay name for the session (defaults to appPath's basename).
appPathYesPath to the Electron app. May be absolute or relative to the MCP process's cwd. Points at the folder that contains `package.json` in dev, or an unpackaged .app/.exe bundle in test.
debugPortNoCDP port for renderers (default: auto-pick in 9222-9999).
inspectPortNoNode inspector port for the main process (default: auto-pick).
electronArgsNoExtra args passed to Electron after the app path.
waitTimeoutMsNoHow long to wait for both debug ports to become live (default 30000).
electronBinaryNoOverride the Electron executable (defaults to the project-local `node_modules/.bin/electron`, falling back to `electron` on PATH).
Behavior4/5

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

No annotations, so description carries full burden. It discloses the flags set (`--remote-debugging-port`, `--inspect`), default port ranges, and wait timeout. However, it lacks details on error behavior (e.g., if ports fail) or side effects.

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, front-loaded with the primary action and flags, then the alternative tool mention. No wasted words.

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?

With 8 parameters and no output schema, the description should cover what the tool returns. It does not mention return values or session handling, leaving a gap in completeness.

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 each parameter described. The tool description adds no additional parameter meaning beyond what's already in the schema, meeting the baseline expectation.

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?

Description clearly states it spawns an Electron app with specific debugging flags. It distinguishes from sibling 'launch_via_npm' by specifying the use case (apps not needing forge dev-server or packaged test builds).

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

Usage Guidelines5/5

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

Explicitly tells when to use 'launch_via_npm' instead (electron-forge projects) and when this tool is appropriate (apps without forge dev-server or packaged test builds).

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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