Koskamo

Extension.dev MCP

An MCP server that enables agents to build, run, inspect, and publish browser extensions for Chrome, Firefox, Edge, and Safari. It integrates with GitHub to trigger builds on commits and provides tools for store submission and preview deployment.

Visit extension.dev

Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

Extension.dev MCP logo, by extension.devCommunity listingLocal stdioSource reviewed; not executedPublished by extension.dev
Vendor documentation

What you can do with it

  • Build browser extensions from prompts or templates
  • Trigger builds and previews on GitHub commits
  • Submit extensions to Chrome, Firefox, and Edge stores
  • Inspect extension artifacts and track store submission status

Source and maintenance

Community listingRegistry 10.15.1
mcp-registry: io.github.extensiondev/mcp@10.15.1Source repositoryProject website
Maintenance checked

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

@extension.dev/mcp 10.15.1

npmnpx
@extension.dev/mcp package definition
{
  "version": "10.15.1",
  "transport": "stdio",
  "identifier": "@extension.dev/mcp",
  "runtimeHint": "npx",
  "registryType": "npm",
  "registryBaseUrl": "https://registry.npmjs.org"
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.
Cursor configuration
{
  "mcpServers": {
    "extension-dev-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@extension.dev/mcp@10.15.1"
      ]
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.
Cline configuration
{
  "mcpServers": {
    "extension-dev-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@extension.dev/mcp@10.15.1"
      ]
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.
VS Code configuration
{
  "servers": {
    "extension-dev-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@extension.dev/mcp@10.15.1"
      ]
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.
Claude Desktop configuration
{
  "mcpServers": {
    "extension-dev-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@extension.dev/mcp@10.15.1"
      ]
    }
  }
}

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