Connect :3 Extensions with MCP

1. Create a token

1. Sign in and open Account settings.
2. Under MCP access, give the token a name that identifies the client or machine.
3. Select Create token and copy the resulting mcp_live_... value.

The full token is shown once. Tokens expire after 30 days and can be revoked from the same page.

Open Account settings

2. Store the token

Use an environment variable so the token does not need to appear in a project configuration file. Replace the placeholder with the token you just created.

Windows PowerShell

[Environment]::SetEnvironmentVariable("EXTENSIONS_MCP_TOKEN", "mcp_live_YOUR_TOKEN", "User")

macOS and Linux

export EXTENSIONS_MCP_TOKEN='mcp_live_YOUR_TOKEN'

Start or restart the MCP client after setting the variable. The PowerShell command applies to newly started applications; the shell command applies to clients launched from that shell.

3. Claude Code

Add this project-scoped configuration as .mcp.json in the project root:

{
  "mcpServers": {
    "extensions": {
      "type": "http",
      "url": "https://extensions.proxied.tech/mcp",
      "headers": {
        "Authorization": "Bearer ${EXTENSIONS_MCP_TOKEN}"
      }
    }
  }
}

Run claude, approve the project server when prompted, then use /mcp to check its status.

Quick user-wide setup

This alternative stores the token in Claude Code's user configuration and makes the server available across projects:

claude mcp add --transport http extensions --scope user https://extensions.proxied.tech/mcp --header "Authorization: Bearer mcp_live_YOUR_TOKEN"

Check the connection with claude mcp get extensions. See the Claude Code MCP reference for client-specific options.

4. Codex

Add the server to ~/.codex/config.toml. The Codex desktop app, CLI, and IDE extension share this configuration on the same host.

[mcp_servers.extensions]
url = "https://extensions.proxied.tech/mcp"
bearer_token_env_var = "EXTENSIONS_MCP_TOKEN"

Restart Codex, then run codex mcp list or open /mcp inside Codex to confirm the server is connected. See the Codex MCP reference for client-specific options.

Other MCP clients

Choose Streamable HTTP and enter the following connection values. Some clients call the transport simply HTTP.

If the client accepts an mcpServers JSON object, the Claude Code example is the usual shape. Keep the required type field and adapt environment-variable syntax to that client.

Available tools

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Troubleshooting