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+# MCP Authentication Patterns
+
+Complete guide to authentication methods for MCP servers in Claude Code plugins.
+
+## Overview
+
+MCP servers support multiple authentication methods depending on the server type and service requirements. Choose the method that best matches your use case and security requirements.
+
+## OAuth (Automatic)
+
+### How It Works
+
+Claude Code automatically handles the complete OAuth 2.0 flow for SSE and HTTP servers:
+
+1. User attempts to use MCP tool
+2. Claude Code detects authentication needed
+3. Opens browser for OAuth consent
+4. User authorizes in browser
+5. Tokens stored securely by Claude Code
+6. Automatic token refresh
+
+### Configuration
+
+```json
+{
+  "service": {
+    "type": "sse",
+    "url": "https://mcp.example.com/sse"
+  }
+}
+```
+
+No additional auth configuration needed! Claude Code handles everything.
+
+### Supported Services
+
+**Known OAuth-enabled MCP servers:**
+- Asana: `https://mcp.asana.com/sse`
+- GitHub (when available)
+- Google services (when available)
+- Custom OAuth servers
+
+### OAuth Scopes
+
+OAuth scopes are determined by the MCP server. Users see required scopes during the consent flow.
+
+**Document required scopes in your README:**
+```markdown
+## Authentication
+
+This plugin requires the following Asana permissions:
+- Read tasks and projects
+- Create and update tasks
+- Access workspace data
+```
+
+### Token Storage
+
+Tokens are stored securely by Claude Code:
+- Not accessible to plugins
+- Encrypted at rest
+- Automatic refresh
+- Cleared on sign-out
+
+### Troubleshooting OAuth
+
+**Authentication loop:**
+- Clear cached tokens (sign out and sign in)
+- Check OAuth redirect URLs
+- Verify server OAuth configuration
+
+**Scope issues:**
+- User may need to re-authorize for new scopes
+- Check server documentation for required scopes
+
+**Token expiration:**
+- Claude Code auto-refreshes
+- If refresh fails, prompts re-authentication
+
+## Token-Based Authentication
+
+### Bearer Tokens
+
+Most common for HTTP and WebSocket servers.
+
+**Configuration:**
+```json
+{
+  "api": {
+    "type": "http",
+    "url": "https://api.example.com/mcp",
+    "headers": {
+      "Authorization": "Bearer ${API_TOKEN}"
+    }
+  }
+}
+```
+
+**Environment variable:**
+```bash
+export API_TOKEN="your-secret-token-here"
+```
+
+### API Keys
+
+Alternative to Bearer tokens, often in custom headers.
+
+**Configuration:**
+```json
+{
+  "api": {
+    "type": "http",
+    "url": "https://api.example.com/mcp",
+    "headers": {
+      "X-API-Key": "${API_KEY}",
+      "X-API-Secret": "${API_SECRET}"
+    }
+  }
+}
+```
+
+### Custom Headers
+
+Services may use custom authentication headers.
+
+**Configuration:**
+```json
+{
+  "service": {
+    "type": "sse",
+    "url": "https://mcp.example.com/sse",
+    "headers": {
+      "X-Auth-Token": "${AUTH_TOKEN}",
+      "X-User-ID": "${USER_ID}",
+      "X-Tenant-ID": "${TENANT_ID}"
+    }
+  }
+}
+```
+
+### Documenting Token Requirements
+
+Always document in your README:
+
+```markdown
+## Setup
+
+### Required Environment Variables
+
+Set these environment variables before using the plugin:
+
+\`\`\`bash
+export API_TOKEN="your-token-here"
+export API_SECRET="your-secret-here"
+\`\`\`
+
+### Obtaining Tokens
+
+1. Visit https://api.example.com/tokens
+2. Create a new API token
+3. Copy the token and secret
+4. Set environment variables as shown above
+
+### Token Permissions
+
+The API token needs the following permissions:
+- Read access to resources
+- Write access for creating items
+- Delete access (optional, for cleanup operations)
+\`\`\`
+```
+
+## Environment Variable Authentication (stdio)
+
+### Passing Credentials to Server
+
+For stdio servers, pass credentials via environment variables:
+
+```json
+{
+  "database": {
+    "command": "python",
+    "args": ["-m", "mcp_server_db"],
+    "env": {
+      "DATABASE_URL": "${DATABASE_URL}",
+      "DB_USER": "${DB_USER}",
+      "DB_PASSWORD": "${DB_PASSWORD}"
+    }
+  }
+}
+```
+
+### User Environment Variables
+
+```bash
+# User sets these in their shell
+export DATABASE_URL="postgresql://localhost/mydb"
+export DB_USER="myuser"
+export DB_PASSWORD="mypassword"
+```
+
+### Documentation Template
+
+```markdown
+## Database Configuration
+
+Set these environment variables:
+
+\`\`\`bash
+export DATABASE_URL="postgresql://host:port/database"
+export DB_USER="username"
+export DB_PASSWORD="password"
+\`\`\`
+
+Or create a `.env` file (add to `.gitignore`):
+
+\`\`\`
+DATABASE_URL=postgresql://localhost:5432/mydb
+DB_USER=myuser
+DB_PASSWORD=mypassword
+\`\`\`
+
+Load with: \`source .env\` or \`export $(cat .env | xargs)\`
+\`\`\`
+```
+
+## Dynamic Headers
+
+### Headers Helper Script
+
+For tokens that change or expire, use a helper script:
+
+```json
+{
+  "api": {
+    "type": "sse",
+    "url": "https://api.example.com",
+    "headersHelper": "${CLAUDE_PLUGIN_ROOT}/scripts/get-headers.sh"
+  }
+}
+```
+
+**Script (get-headers.sh):**
+```bash
+#!/bin/bash
+# Generate dynamic authentication headers
+
+# Fetch fresh token
+TOKEN=$(get-fresh-token-from-somewhere)
+
+# Output JSON headers
+cat <<EOF
+{
+  "Authorization": "Bearer $TOKEN",
+  "X-Timestamp": "$(date -Iseconds)"
+}
+EOF
+```
+
+### Use Cases for Dynamic Headers
+
+- Short-lived tokens that need refresh
+- Tokens with HMAC signatures
+- Time-based authentication
+- Dynamic tenant/workspace selection
+
+## Security Best Practices
+
+### DO
+
+✅ **Use environment variables:**
+```json
+{
+  "headers": {
+    "Authorization": "Bearer ${API_TOKEN}"
+  }
+}
+```
+
+✅ **Document required variables in README**
+
+✅ **Use HTTPS/WSS always**
+
+✅ **Implement token rotation**
+
+✅ **Store tokens securely (env vars, not files)**
+
+✅ **Let OAuth handle authentication when available**
+
+### DON'T
+
+❌ **Hardcode tokens:**
+```json
+{
+  "headers": {
+    "Authorization": "Bearer sk-abc123..."  // NEVER!
+  }
+}
+```
+
+❌ **Commit tokens to git**
+
+❌ **Share tokens in documentation**
+
+❌ **Use HTTP instead of HTTPS**
+
+❌ **Store tokens in plugin files**
+
+❌ **Log tokens or sensitive headers**
+
+## Multi-Tenancy Patterns
+
+### Workspace/Tenant Selection
+
+**Via environment variable:**
+```json
+{
+  "api": {
+    "type": "http",
+    "url": "https://api.example.com/mcp",
+    "headers": {
+      "Authorization": "Bearer ${API_TOKEN}",
+      "X-Workspace-ID": "${WORKSPACE_ID}"
+    }
+  }
+}
+```
+
+**Via URL:**
+```json
+{
+  "api": {
+    "type": "http",
+    "url": "https://${TENANT_ID}.api.example.com/mcp"
+  }
+}
+```
+
+### Per-User Configuration
+
+Users set their own workspace:
+
+```bash
+export WORKSPACE_ID="my-workspace-123"
+export TENANT_ID="my-company"
+```
+
+## Authentication Troubleshooting
+
+### Common Issues
+
+**401 Unauthorized:**
+- Check token is set correctly
+- Verify token hasn't expired
+- Check token has required permissions
+- Ensure header format is correct
+
+**403 Forbidden:**
+- Token valid but lacks permissions
+- Check scope/permissions
+- Verify workspace/tenant ID
+- May need admin approval
+
+**Token not found:**
+```bash
+# Check environment variable is set
+echo $API_TOKEN
+
+# If empty, set it
+export API_TOKEN="your-token"
+```
+
+**Token in wrong format:**
+```json
+// Correct
+"Authorization": "Bearer sk-abc123"
+
+// Wrong
+"Authorization": "sk-abc123"
+```
+
+### Debugging Authentication
+
+**Enable debug mode:**
+```bash
+claude --debug
+```
+
+Look for:
+- Authentication header values (sanitized)
+- OAuth flow progress
+- Token refresh attempts
+- Authentication errors
+
+**Test authentication separately:**
+```bash
+# Test HTTP endpoint
+curl -H "Authorization: Bearer $API_TOKEN" \
+     https://api.example.com/mcp/health
+
+# Should return 200 OK
+```
+
+## Migration Patterns
+
+### From Hardcoded to Environment Variables
+
+**Before:**
+```json
+{
+  "headers": {
+    "Authorization": "Bearer sk-hardcoded-token"
+  }
+}
+```
+
+**After:**
+```json
+{
+  "headers": {
+    "Authorization": "Bearer ${API_TOKEN}"
+  }
+}
+```
+
+**Migration steps:**
+1. Add environment variable to plugin README
+2. Update configuration to use ${VAR}
+3. Test with variable set
+4. Remove hardcoded value
+5. Commit changes
+
+### From Basic Auth to OAuth
+
+**Before:**
+```json
+{
+  "headers": {
+    "Authorization": "Basic ${BASE64_CREDENTIALS}"
+  }
+}
+```
+
+**After:**
+```json
+{
+  "type": "sse",
+  "url": "https://mcp.example.com/sse"
+}
+```
+
+**Benefits:**
+- Better security
+- No credential management
+- Automatic token refresh
+- Scoped permissions
+
+## Advanced Authentication
+
+### Mutual TLS (mTLS)
+
+Some enterprise services require client certificates.
+
+**Not directly supported in MCP configuration.**
+
+**Workaround:** Wrap in stdio server that handles mTLS:
+
+```json
+{
+  "secure-api": {
+    "command": "${CLAUDE_PLUGIN_ROOT}/servers/mtls-wrapper",
+    "args": ["--cert", "${CLIENT_CERT}", "--key", "${CLIENT_KEY}"],
+    "env": {
+      "API_URL": "https://secure.example.com"
+    }
+  }
+}
+```
+
+### JWT Tokens
+
+Generate JWT tokens dynamically with headers helper:
+
+```bash
+#!/bin/bash
+# generate-jwt.sh
+
+# Generate JWT (using library or API call)
+JWT=$(generate-jwt-token)
+
+echo "{\"Authorization\": \"Bearer $JWT\"}"
+```
+
+```json
+{
+  "headersHelper": "${CLAUDE_PLUGIN_ROOT}/scripts/generate-jwt.sh"
+}
+```
+
+### HMAC Signatures
+
+For APIs requiring request signing:
+
+```bash
+#!/bin/bash
+# generate-hmac.sh
+
+TIMESTAMP=$(date -Iseconds)
+SIGNATURE=$(echo -n "$TIMESTAMP" | openssl dgst -sha256 -hmac "$SECRET_KEY" | cut -d' ' -f2)
+
+cat <<EOF
+{
+  "X-Timestamp": "$TIMESTAMP",
+  "X-Signature": "$SIGNATURE",
+  "X-API-Key": "$API_KEY"
+}
+EOF
+```
+
+## Best Practices Summary
+
+### For Plugin Developers
+
+1. **Prefer OAuth** when service supports it
+2. **Use environment variables** for tokens
+3. **Document all required variables** in README
+4. **Provide setup instructions** with examples
+5. **Never commit credentials**
+6. **Use HTTPS/WSS only**
+7. **Test authentication thoroughly**
+
+### For Plugin Users
+
+1. **Set environment variables** before using plugin
+2. **Keep tokens secure** and private
+3. **Rotate tokens regularly**
+4. **Use different tokens** for dev/prod
+5. **Don't commit .env files** to git
+6. **Review OAuth scopes** before authorizing
+
+## Conclusion
+
+Choose the authentication method that matches your MCP server's requirements:
+- **OAuth** for cloud services (easiest for users)
+- **Bearer tokens** for API services
+- **Environment variables** for stdio servers
+- **Dynamic headers** for complex auth flows
+
+Always prioritize security and provide clear setup documentation for users.