Agent skill · marketing growth · membranedev
invoice-ninja
Invoice Ninja integration. Manage Organizations. Use when the user wants to interact with Invoice Ninja data.
Why this skill is useful
Provides specific commands and workflows for integrating with Invoice Ninja that the AI wouldn't reliably generate on its own.
What it needs
Requires @membranehq/cli installed locally. Requires membrane account access. About 5k tokens when loaded. Last updated 2026-04-28. 253 stars on the source repository.
What this skill does
Invoice Ninja Invoice Ninja is an open-source invoicing and expense tracking application. It's primarily used by freelancers, small businesses, and entrepreneurs to manage their billing and get paid faster. The platform offers features like creating invoices, accepting payments, tracking expenses, and managing clients. Official docs: https://invoiceninja.github.io/docs/ Invoice Ninja Overview Invoice Invoice Item Client Payment Credit User Company Task Expense Project Vendor Product Use action names and parameters as needed. Working with Invoice Ninja This skill uses the Membrane CLI to interact with Invoice Ninja. Membrane handles authentication and credentials refresh automatically — so you can focus on the integration logic rather than auth plumbing. Install the CLI Install the Membrane CLI so you can run membrane from the terminal: Authentication This will either open a browser for authentication or print an authorization URL to the console, depending on whether interactive mode is available. Headless environments: The command will print an authorization URL. Ask the user to open it in a browser. When they see a code after completing login, finish with: Add --json to any command for machine-readable JSON output. Agent Types : claude, openclaw, codex, warp, windsurf, etc. Those will be used to adjust tooling to be used best with your harness Connecting to Invoice Ninja Use membrane connection ensure to find or create a connection by app URL or domain: The user completes authentication in the browser. The output contains the new connection id. This is the fastest way to get a connection. The URL is normalized to a domain and matched against known apps. If no app is found, one is created and a connector is built automatically. If the returned connection has state: "READY", skip to Step 2. 1b. …
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills membranedev/invoice-ninja