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+---
+name: "gh-auth-isolation"
+description: "Safely manage multiple GitHub identities (EMU + personal) in agent workflows"
+domain: "security, github-integration, authentication, multi-account"
+confidence: "high"
+source: "earned (production usage across 50+ sessions with EMU corp + personal GitHub accounts)"
+tools:
+  - name: "gh"
+    description: "GitHub CLI for authenticated operations"
+    when: "When accessing GitHub resources requiring authentication"
+---
+
+## Context
+
+Many developers use GitHub through an Enterprise Managed User (EMU) account at work while maintaining a personal GitHub account for open-source contributions. AI agents spawned by Squad inherit the shell's default `gh` authentication — which is usually the EMU account. This causes failures when agents try to push to personal repos, create PRs on forks, or interact with resources outside the enterprise org.
+
+This skill teaches agents how to detect the active identity, switch contexts safely, and avoid mixing credentials across operations.
+
+## Patterns
+
+### Detect Current Identity
+
+Before any GitHub operation, check which account is active:
+
+```bash
+gh auth status
+```
+
+Look for:
+- `Logged in to github.com as USERNAME` — the active account
+- `Token scopes: ...` — what permissions are available
+- Multiple accounts will show separate entries
+
+### Extract a Specific Account's Token
+
+When you need to operate as a specific user (not the default):
+
+```bash
+# Get the personal account token (by username)
+gh auth token --user personaluser
+
+# Get the EMU account token
+gh auth token --user corpalias_enterprise
+```
+
+**Use case:** Push to a personal fork while the default `gh` auth is the EMU account.
+
+### Push to Personal Repos from EMU Shell
+
+The most common scenario: your shell defaults to the EMU account, but you need to push to a personal GitHub repo.
+
+```bash
+# 1. Extract the personal token
+$token = gh auth token --user personaluser
+
+# 2. Push using token-authenticated HTTPS
+git push https://personaluser:$token@github.com/personaluser/repo.git branch-name
+```
+
+**Why this works:** `gh auth token --user` reads from `gh`'s credential store without switching the active account. The token is used inline for a single operation and never persisted.
+
+### Create PRs on Personal Forks
+
+When the default `gh` context is EMU but you need to create a PR from a personal fork:
+
+```bash
+# Option 1: Use --repo flag (works if token has access)
+gh pr create --repo upstream/repo --head personaluser:branch --title "..." --body "..."
+
+# Option 2: Temporarily set GH_TOKEN for one command
+$env:GH_TOKEN = $(gh auth token --user personaluser)
+gh pr create --repo upstream/repo --head personaluser:branch --title "..."
+Remove-Item Env:\GH_TOKEN
+```
+
+### Config Directory Isolation (Advanced)
+
+For complete isolation between accounts, use separate `gh` config directories:
+
+```bash
+# Personal account operations
+$env:GH_CONFIG_DIR = "$HOME/.config/gh-public"
+gh auth login  # Login with personal account (one-time setup)
+gh repo clone personaluser/repo
+
+# EMU account operations (default)
+Remove-Item Env:\GH_CONFIG_DIR
+gh auth status  # Back to EMU account
+```
+
+**Setup (one-time):**
+```bash
+# Create isolated config for personal account
+mkdir ~/.config/gh-public
+$env:GH_CONFIG_DIR = "$HOME/.config/gh-public"
+gh auth login --web --git-protocol https
+```
+
+### Shell Aliases for Quick Switching
+
+Add to your shell profile for convenience:
+
+```powershell
+# PowerShell profile
+function ghp { $env:GH_CONFIG_DIR = "$HOME/.config/gh-public"; gh @args; Remove-Item Env:\GH_CONFIG_DIR }
+function ghe { gh @args }  # Default EMU
+
+# Usage:
+# ghp repo clone personaluser/repo   # Uses personal account
+# ghe issue list                       # Uses EMU account
+```
+
+```bash
+# Bash/Zsh profile
+alias ghp='GH_CONFIG_DIR=~/.config/gh-public gh'
+alias ghe='gh'
+
+# Usage:
+# ghp repo clone personaluser/repo
+# ghe issue list
+```
+
+## Examples
+
+### ✓ Correct: Agent pushes blog post to personal GitHub Pages
+
+```powershell
+# Agent needs to push to personaluser.github.io (personal repo)
+# Default gh auth is corpalias_enterprise (EMU)
+
+$token = gh auth token --user personaluser
+git remote set-url origin https://personaluser:$token@github.com/personaluser/personaluser.github.io.git
+git push origin main
+
+# Clean up — don't leave token in remote URL
+git remote set-url origin https://github.com/personaluser/personaluser.github.io.git
+```
+
+### ✓ Correct: Agent creates a PR from personal fork to upstream
+
+```powershell
+# Fork: personaluser/squad, Upstream: bradygaster/squad
+# Agent is on branch contrib/fix-docs in the fork clone
+
+git push origin contrib/fix-docs  # Pushes to fork (may need token auth)
+
+# Create PR targeting upstream
+gh pr create --repo bradygaster/squad --head personaluser:contrib/fix-docs `
+  --title "docs: fix installation guide" `
+  --body "Fixes #123"
+```
+
+### ✗ Incorrect: Blindly pushing with wrong account
+
+```bash
+# BAD: Agent assumes default gh auth works for personal repos
+git push origin main
+# ERROR: Permission denied — EMU account has no access to personal repo
+
+# BAD: Hardcoding tokens in scripts
+git push https://personaluser:ghp_xxxxxxxxxxxx@github.com/personaluser/repo.git main
+# SECURITY RISK: Token exposed in command history and process list
+```
+
+### ✓ Correct: Check before you push
+
+```bash
+# Always verify which account has access before operations
+gh auth status
+# If wrong account, use token extraction:
+$token = gh auth token --user personaluser
+git push https://personaluser:$token@github.com/personaluser/repo.git main
+```
+
+## Anti-Patterns
+
+- ❌ **Hardcoding tokens** in scripts, environment variables, or committed files. Use `gh auth token --user` to extract at runtime.
+- ❌ **Assuming the default `gh` auth works** for all repos. EMU accounts can't access personal repos and vice versa.
+- ❌ **Switching `gh auth login`** globally mid-session. This changes the default for ALL processes and can break parallel agents.
+- ❌ **Storing personal tokens in `.env`** or `.squad/` files. These get committed by Scribe. Use `gh`'s credential store.
+- ❌ **Ignoring token cleanup** after inline HTTPS pushes. Always reset the remote URL to avoid persisting tokens.
+- ❌ **Using `gh auth switch`** in multi-agent sessions. One agent switching affects all others sharing the shell.
+- ❌ **Mixing EMU and personal operations** in the same git clone. Use separate clones or explicit remote URLs per operation.