auth docs (#730)

* add docs

* note

* format

skills/agent-browser/SKILL.md

@@ -44,6 +44,62 @@ agent-browser open https://example.com && agent-browser wait --load networkidle
 
 **When to chain:** Use `&&` when you don't need to read the output of an intermediate command before proceeding (e.g., open + wait + screenshot). Run commands separately when you need to parse the output first (e.g., snapshot to discover refs, then interact using those refs).
 
+## Handling Authentication
+
+When automating a site that requires login, choose the approach that fits:
+
+**Option 1: Import auth from the user's browser (fastest for one-off tasks)**
+
+```bash
+# Connect to the user's running Chrome (they're already logged in)
+agent-browser --auto-connect state save ./auth.json
+# Use that auth state
+agent-browser --state ./auth.json open https://app.example.com/dashboard
+```
+
+State files contain session tokens in plaintext -- add to `.gitignore` and delete when no longer needed. Set `AGENT_BROWSER_ENCRYPTION_KEY` for encryption at rest.
+
+**Option 2: Persistent profile (simplest for recurring tasks)**
+
+```bash
+# First run: login manually or via automation
+agent-browser --profile ~/.myapp open https://app.example.com/login
+# ... fill credentials, submit ...
+
+# All future runs: already authenticated
+agent-browser --profile ~/.myapp open https://app.example.com/dashboard
+```
+
+**Option 3: Session name (auto-save/restore cookies + localStorage)**
+
+```bash
+agent-browser --session-name myapp open https://app.example.com/login
+# ... login flow ...
+agent-browser close  # State auto-saved
+
+# Next time: state auto-restored
+agent-browser --session-name myapp open https://app.example.com/dashboard
+```
+
+**Option 4: Auth vault (credentials stored encrypted, login by name)**
+
+```bash
+echo "$PASSWORD" | agent-browser auth save myapp --url https://app.example.com/login --username user --password-stdin
+agent-browser auth login myapp
+```
+
+**Option 5: State file (manual save/load)**
+
+```bash
+# After logging in:
+agent-browser state save ./auth.json
+# In a future session:
+agent-browser state load ./auth.json
+agent-browser open https://app.example.com/dashboard
+```
+
+See [references/authentication.md](references/authentication.md) for OAuth, 2FA, cookie-based auth, and token refresh patterns.
+
 ## Essential Commands
 
 ```bash

skills/agent-browser/references/authentication.md

@@ -6,6 +6,9 @@ Login flows, session persistence, OAuth, 2FA, and authenticated browsing.
 
 ## Contents
 
+- [Import Auth from Your Browser](#import-auth-from-your-browser)
+- [Persistent Profiles](#persistent-profiles)
+- [Session Persistence](#session-persistence)
 - [Basic Login Flow](#basic-login-flow)
 - [Saving Authentication State](#saving-authentication-state)
 - [Restoring Authentication](#restoring-authentication)
@@ -16,6 +19,104 @@ Login flows, session persistence, OAuth, 2FA, and authenticated browsing.
 - [Token Refresh Handling](#token-refresh-handling)
 - [Security Best Practices](#security-best-practices)
 
+## Import Auth from Your Browser
+
+The fastest way to authenticate is to reuse cookies from a Chrome session you are already logged into.
+
+**Step 1: Start Chrome with remote debugging**
+
+```bash
+# macOS
+"/Applications/Google Chrome.app/Contents/MacOS/Google Chrome" --remote-debugging-port=9222
+
+# Linux
+google-chrome --remote-debugging-port=9222
+
+# Windows
+"C:\Program Files\Google\Chrome\Application\chrome.exe" --remote-debugging-port=9222
+```
+
+Log in to your target site(s) in this Chrome window as you normally would.
+
+> **Security note:** `--remote-debugging-port` exposes full browser control on localhost. Any local process can connect and read cookies, execute JS, etc. Only use on trusted machines and close Chrome when done.
+
+**Step 2: Grab the auth state**
+
+```bash
+# Auto-discover the running Chrome and save its cookies + localStorage
+agent-browser --auto-connect state save ./my-auth.json
+```
+
+**Step 3: Reuse in automation**
+
+```bash
+# Load auth at launch
+agent-browser --state ./my-auth.json open https://app.example.com/dashboard
+
+# Or load into an existing session
+agent-browser state load ./my-auth.json
+agent-browser open https://app.example.com/dashboard
+```
+
+This works for any site, including those with complex OAuth flows, SSO, or 2FA -- as long as Chrome already has valid session cookies.
+
+> **Security note:** State files contain session tokens in plaintext. Add them to `.gitignore`, delete when no longer needed, and set `AGENT_BROWSER_ENCRYPTION_KEY` for encryption at rest. See [Security Best Practices](#security-best-practices).
+
+**Tip:** Combine with `--session-name` so the imported auth auto-persists across restarts:
+
+```bash
+agent-browser --session-name myapp state load ./my-auth.json
+# From now on, state is auto-saved/restored for "myapp"
+```
+
+## Persistent Profiles
+
+Use `--profile` to point agent-browser at a Chrome user data directory. This persists everything (cookies, IndexedDB, service workers, cache) across browser restarts without explicit save/load:
+
+```bash
+# First run: login once
+agent-browser --profile ~/.myapp-profile open https://app.example.com/login
+# ... complete login flow ...
+
+# All subsequent runs: already authenticated
+agent-browser --profile ~/.myapp-profile open https://app.example.com/dashboard
+```
+
+Use different paths for different projects or test users:
+
+```bash
+agent-browser --profile ~/.profiles/admin open https://app.example.com
+agent-browser --profile ~/.profiles/viewer open https://app.example.com
+```
+
+Or set via environment variable:
+
+```bash
+export AGENT_BROWSER_PROFILE=~/.myapp-profile
+agent-browser open https://app.example.com/dashboard
+```
+
+## Session Persistence
+
+Use `--session-name` to auto-save and restore cookies + localStorage by name, without managing files:
+
+```bash
+# Auto-saves state on close, auto-restores on next launch
+agent-browser --session-name twitter open https://twitter.com
+# ... login flow ...
+agent-browser close  # state saved to ~/.agent-browser/sessions/
+
+# Next time: state is automatically restored
+agent-browser --session-name twitter open https://twitter.com
+```
+
+Encrypt state at rest:
+
+```bash
+export AGENT_BROWSER_ENCRYPTION_KEY=$(openssl rand -hex 32)
+agent-browser --session-name secure open https://app.example.com
+```
+
 ## Basic Login Flow
 
 ```bash