Replace
<MCP_URL> with the MCP URL and <CLIENT_ID> with the Client ID — see
URL & Client ID. Use the callback port 53612 where applicable.Claude Code
Add with the CLI:Codex
Install from the Codex desktop app — Firmable is a verified plugin, so no MCP URL or Client ID is required, just sign in:1
Find Firmable
In the Codex desktop app, open Plugins from the sidebar, search for 
firmable, then click
Firmable under Public to open it.
2
Install the plugin
On the Firmable page, click Install plugin.

3
Connect Firmable
In the Connect Firmable dialog, review the data-sharing notice and click Continue to Firmable.

4
Sign in to finish
Follow the remaining prompts to sign in with Firmable and authorize access. Once connected,
Firmable is available to use in Codex.
Cursor
Add to~/.cursor/mcp.json:
VS Code
Add to.vscode/mcp.json in your workspace (or your user config via MCP: Open User Configuration):
Windsurf
Add to~/.codeium/windsurf/mcp_config.json: