Running And Testing Locally

What it does

When your agent uses it

• Running the Nango application locally for development and browser testing - covers Docker services
• Troubleshooting startup issues

Example prompts

• “/running-and-testing-locally”

Requirements

• Python 3
• Node.js
• Docker
• A credential in NANGO_ENCRYPTION_KEY
• A credential in PUBLIC_POSTHOG_KEY

Workflow steps

8 steps, taken from the first numbered list in SKILL.md.

1. 1Navigate to http://localhost:3000/signup
2. 2Fill in the signup form with the standard test credentials (Name, Email, Password). Password must contain: 8+ chars, uppercase, number…
3. 3After submitting, the page shows a "Please verify your email" banner
4. 4In local dev, no email is actually sent. The server logs show the email content instead with (EmailClient) prefix
5. 5Find the verification URL in the captured logs
6. 6Open the verification URL (format: http://localhost:3000/signup/verification/) in the browser
7. 7After verification, the app redirects to an onboarding survey ("How did you hear about Nango?") — click any option or "Skip for now" to…
8. 8You land on the Getting Started page / dashboard with sidebar navigation (Integrations, Connections, Logs, Metrics, Environment settings)

What it can do on your machine

Read from SKILL.md and the folder at commit b309bc1. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • npm
  • docker
  • openssl
  • git
  • python3

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  Links to these hosts (documentation or services it may open):

  • linear.app

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names these keys or tokens, usually read from environment variables:

  • NANGO_ENCRYPTION_KEY
  • WORKOS_API_KEY
  • PUBLIC_POSTHOG_KEY

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Running And Testing Locally loads about 4k tokens when it runs. Until then it costs about 50 tokens; SKILL.md has 1,486 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~50

When it runs · the whole SKILL.md, loaded when a task matches

~4k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

• NoteMentions a .env fileSKILL.md:40

  # 2. Set up environment — check if .env exists first

• NoteMentions a .env fileSKILL.md:41

  #    If .env already exists, skip this step to avoid overwriting user customizations.

• NoteMentions a .env fileSKILL.md:43

  if [ ! -f .env ]; then

• NoteMentions a .env fileSKILL.md:44

  cp .env.example .env

• NoteMentions a .env fileSKILL.md:46

  PTION_KEY=$(openssl rand -base64 32)" >> .env

• NoteMentions a .env fileSKILL.md:48

  echo "FLAG_AUTH_ENABLED=true" >> .env

• NoteMentions a .env fileSKILL.md:50

  echo "FLAG_AUTH_ROLES_ENABLED=true" >> .env

• NoteMentions a .env fileSKILL.md:63

  **If `.env` already exists** but is missing required settings, ensure the following are set:

• NoteMentions a .env fileSKILL.md:102

  The `.env` file at repo root configures local dev (copy from `.env.example` if it doesn't exist). Key settings:

• NoteMentions a .env fileSKILL.md:117

  th `openssl rand -base64 32` and add to `.env`).

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 1,486 words (~3,976 tokens).

name

running-and-testing-locally

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .agents/skills/running-and-testing-locally of NangoHQ/nango.

Open the folder on GitHubat commit b309bc1