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Configuration Guide

This guide covers all configuration options for the Zen MCP Server. The server is configured through environment variables defined in your .env file.

Quick Start Configuration

Auto Mode (Recommended): Set DEFAULT_MODEL=auto and let Claude intelligently select the best model for each task:

# Basic configuration
DEFAULT_MODEL=auto
GEMINI_API_KEY=your-gemini-key
OPENAI_API_KEY=your-openai-key

Complete Configuration Reference

Required Configuration

Workspace Root:


### API Keys (At least one required)

**Important:** Use EITHER OpenRouter OR native APIs, not both! Having both creates ambiguity about which provider serves each model.

**Option 1: Native APIs (Recommended for direct access)**
```env
# Google Gemini API
GEMINI_API_KEY=your_gemini_api_key_here
# Get from: https://makersuite.google.com/app/apikey

# OpenAI API  
OPENAI_API_KEY=your_openai_api_key_here
# Get from: https://platform.openai.com/api-keys

# X.AI GROK API
XAI_API_KEY=your_xai_api_key_here
# Get from: https://console.x.ai/

Option 2: OpenRouter (Access multiple models through one API)

# OpenRouter for unified model access
OPENROUTER_API_KEY=your_openrouter_api_key_here
# Get from: https://openrouter.ai/
# If using OpenRouter, comment out native API keys above

Option 3: Custom API Endpoints (Local models)

# For Ollama, vLLM, LM Studio, etc.
CUSTOM_API_URL=http://localhost:11434/v1  # Ollama example
CUSTOM_API_KEY=                                      # Empty for Ollama
CUSTOM_MODEL_NAME=llama3.2                          # Default model

Local Model Connection:

  • Use standard localhost URLs since the server runs natively
  • Example: http://localhost:11434/v1 for Ollama

Model Configuration

Default Model Selection:

# Options: 'auto', 'pro', 'flash', 'o3', 'o3-mini', 'o4-mini', etc.
DEFAULT_MODEL=auto  # Claude picks best model for each task (recommended)

Available Models:

  • auto: Claude automatically selects the optimal model
  • pro (Gemini 2.5 Pro): Extended thinking, deep analysis
  • flash (Gemini 2.0 Flash): Ultra-fast responses
  • o3: Strong logical reasoning (200K context)
  • o3-mini: Balanced speed/quality (200K context)
  • o4-mini: Latest reasoning model, optimized for shorter contexts
  • grok-3: GROK-3 advanced reasoning (131K context)
  • grok-4: GROK-4 flagship model (256K context)
  • Custom models: via OpenRouter or local APIs

Thinking Mode Configuration

Default Thinking Mode for ThinkDeep:

# Only applies to models supporting extended thinking (e.g., Gemini 2.5 Pro)
DEFAULT_THINKING_MODE_THINKDEEP=high

# Available modes and token consumption:
#   minimal: 128 tokens   - Quick analysis, fastest response
#   low:     2,048 tokens - Light reasoning tasks  
#   medium:  8,192 tokens - Balanced reasoning
#   high:    16,384 tokens - Complex analysis (recommended for thinkdeep)
#   max:     32,768 tokens - Maximum reasoning depth

Model Usage Restrictions

Control which models can be used from each provider for cost control, compliance, or standardization:

# Format: Comma-separated list (case-insensitive, whitespace tolerant)
# Empty or unset = all models allowed (default)

# OpenAI model restrictions
OPENAI_ALLOWED_MODELS=o3-mini,o4-mini,mini

# Gemini model restrictions  
GOOGLE_ALLOWED_MODELS=flash,pro

# X.AI GROK model restrictions
XAI_ALLOWED_MODELS=grok-3,grok-3-fast,grok-4

# OpenRouter model restrictions (affects models via custom provider)
OPENROUTER_ALLOWED_MODELS=opus,sonnet,mistral

Supported Model Names:

OpenAI Models:

  • o3 (200K context, high reasoning)
  • o3-mini (200K context, balanced)
  • o4-mini (200K context, latest balanced)
  • mini (shorthand for o4-mini)

Gemini Models:

  • gemini-2.5-flash (1M context, fast)
  • gemini-2.5-pro (1M context, powerful)
  • flash (shorthand for Flash model)
  • pro (shorthand for Pro model)

X.AI GROK Models:

  • grok-4 (256K context, flagship Grok model with reasoning, vision, and structured outputs)
  • grok-3 (131K context, advanced reasoning)
  • grok-3-fast (131K context, higher performance)
  • grok (shorthand for grok-4)
  • grok4 (shorthand for grok-4)
  • grok3 (shorthand for grok-3)
  • grokfast (shorthand for grok-3-fast)

Example Configurations:

# Cost control - only cheap models
OPENAI_ALLOWED_MODELS=o4-mini
GOOGLE_ALLOWED_MODELS=flash

# Single model standardization
OPENAI_ALLOWED_MODELS=o4-mini
GOOGLE_ALLOWED_MODELS=pro

# Balanced selection
GOOGLE_ALLOWED_MODELS=flash,pro
XAI_ALLOWED_MODELS=grok,grok-3-fast

Advanced Configuration

Custom Model Configuration:

# Override default location of custom_models.json
CUSTOM_MODELS_CONFIG_PATH=/path/to/your/custom_models.json
# Override default location of openrouter_models.json
OPENROUTER_MODELS_CONFIG_PATH=/path/to/your/openrouter_models.json

Conversation Settings:

# How long AI-to-AI conversation threads persist in memory (hours)
# Conversations are auto-purged when claude closes its MCP connection or 
# when a session is quit / re-launched 
CONVERSATION_TIMEOUT_HOURS=5

# Maximum conversation turns (each exchange = 2 turns)
MAX_CONVERSATION_TURNS=20

Logging Configuration:

# Logging level: DEBUG, INFO, WARNING, ERROR
LOG_LEVEL=DEBUG  # Default: shows detailed operational messages

Configuration Examples

Development Setup

# Development with multiple providers
DEFAULT_MODEL=auto
GEMINI_API_KEY=your-gemini-key
OPENAI_API_KEY=your-openai-key
XAI_API_KEY=your-xai-key
LOG_LEVEL=DEBUG
CONVERSATION_TIMEOUT_HOURS=1

Production Setup

# Production with cost controls
DEFAULT_MODEL=auto
GEMINI_API_KEY=your-gemini-key
OPENAI_API_KEY=your-openai-key
GOOGLE_ALLOWED_MODELS=flash
OPENAI_ALLOWED_MODELS=o4-mini
LOG_LEVEL=INFO
CONVERSATION_TIMEOUT_HOURS=3

Local Development

# Local models only
DEFAULT_MODEL=llama3.2
CUSTOM_API_URL=http://localhost:11434/v1
CUSTOM_API_KEY=
CUSTOM_MODEL_NAME=llama3.2
LOG_LEVEL=DEBUG

OpenRouter Only

# Single API for multiple models
DEFAULT_MODEL=auto
OPENROUTER_API_KEY=your-openrouter-key
OPENROUTER_ALLOWED_MODELS=opus,sonnet,gpt-4
LOG_LEVEL=INFO

Important Notes

Local Networking:

  • Use standard localhost URLs for local models
  • The server runs as a native Python process

API Key Priority:

  • Native APIs take priority over OpenRouter when both are configured
  • Avoid configuring both native and OpenRouter for the same models

Model Restrictions:

  • Apply to all usage including auto mode
  • Empty/unset = all models allowed
  • Invalid model names are warned about at startup

Configuration Changes:

  • Restart the server with ./run-server.sh after changing .env
  • Configuration is loaded once at startup

Related Documentation