deer-flow/backend/docs/CONFIGURATION.md

Configuration Guide

This guide explains how to configure DeerFlow for your environment.

Config Versioning

config.example.yaml contains a config_version field that tracks schema changes. When the example version is higher than your local config.yaml, the application emits a startup warning:

WARNING - Your config.yaml (version 0) is outdated — the latest version is 1.
Run `make config-upgrade` to merge new fields into your config.

• Missing config_version in your config is treated as version 0.
• Run make config-upgrade to auto-merge missing fields (your existing values are preserved, a .bak backup is created).
• When changing the config schema, bump config_version in config.example.yaml.

Configuration Sections

Models

Configure the LLM models available to the agent:

models:
  - name: gpt-4                    # Internal identifier
    display_name: GPT-4            # Human-readable name
    use: langchain_openai:ChatOpenAI  # LangChain class path
    model: gpt-4                   # Model identifier for API
    api_key: $OPENAI_API_KEY       # API key (use env var)
    max_tokens: 4096               # Max tokens per request
    temperature: 0.7               # Sampling temperature

Supported Providers:

• OpenAI (langchain_openai:ChatOpenAI)
• Anthropic (langchain_anthropic:ChatAnthropic)
• DeepSeek (langchain_deepseek:ChatDeepSeek)
• Claude Code OAuth (deerflow.models.claude_provider:ClaudeChatModel)
• Codex CLI (deerflow.models.openai_codex_provider:CodexChatModel)
• Any LangChain-compatible provider

CLI-backed provider examples:

models:
  - name: gpt-5.4
    display_name: GPT-5.4 (Codex CLI)
    use: deerflow.models.openai_codex_provider:CodexChatModel
    model: gpt-5.4
    supports_thinking: true
    supports_reasoning_effort: true

  - name: claude-sonnet-4.6
    display_name: Claude Sonnet 4.6 (Claude Code OAuth)
    use: deerflow.models.claude_provider:ClaudeChatModel
    model: claude-sonnet-4-6
    max_tokens: 4096
    supports_thinking: true

Auth behavior for CLI-backed providers:

• CodexChatModel loads Codex CLI auth from ~/.codex/auth.json
• The Codex Responses endpoint currently rejects max_tokens and max_output_tokens, so CodexChatModel does not expose a request-level token cap
• ClaudeChatModel accepts CLAUDE_CODE_OAUTH_TOKEN, ANTHROPIC_AUTH_TOKEN, CLAUDE_CODE_OAUTH_TOKEN_FILE_DESCRIPTOR, CLAUDE_CODE_CREDENTIALS_PATH, or plaintext ~/.claude/.credentials.json
• On macOS, DeerFlow does not probe Keychain automatically. Use scripts/export_claude_code_oauth.py to export Claude Code auth explicitly when needed

To use OpenAI's /v1/responses endpoint with LangChain, keep using langchain_openai:ChatOpenAI and set:

models:
  - name: gpt-5-responses
    display_name: GPT-5 (Responses API)
    use: langchain_openai:ChatOpenAI
    model: gpt-5
    api_key: $OPENAI_API_KEY
    use_responses_api: true
    output_version: responses/v1

For OpenAI-compatible gateways (for example Novita or OpenRouter), keep using langchain_openai:ChatOpenAI and set base_url:

models:
  - name: novita-deepseek-v3.2
    display_name: Novita DeepSeek V3.2
    use: langchain_openai:ChatOpenAI
    model: deepseek/deepseek-v3.2
    api_key: $NOVITA_API_KEY
    base_url: https://api.novita.ai/openai
    supports_thinking: true
    when_thinking_enabled:
      extra_body:
        thinking:
          type: enabled

  - name: minimax-m2.5
    display_name: MiniMax M2.5
    use: langchain_openai:ChatOpenAI
    model: MiniMax-M2.5
    api_key: $MINIMAX_API_KEY
    base_url: https://api.minimax.io/v1
    max_tokens: 4096
    temperature: 1.0  # MiniMax requires temperature in (0.0, 1.0]
    supports_vision: true

  - name: minimax-m2.5-highspeed
    display_name: MiniMax M2.5 Highspeed
    use: langchain_openai:ChatOpenAI
    model: MiniMax-M2.5-highspeed
    api_key: $MINIMAX_API_KEY
    base_url: https://api.minimax.io/v1
    max_tokens: 4096
    temperature: 1.0  # MiniMax requires temperature in (0.0, 1.0]
    supports_vision: true
  - name: openrouter-gemini-2.5-flash
    display_name: Gemini 2.5 Flash (OpenRouter)
    use: langchain_openai:ChatOpenAI
    model: google/gemini-2.5-flash-preview
    api_key: $OPENAI_API_KEY
    base_url: https://openrouter.ai/api/v1

If your OpenRouter key lives in a different environment variable name, point api_key at that variable explicitly (for example api_key: $OPENROUTER_API_KEY).

Thinking Models: Some models support "thinking" mode for complex reasoning:

models:
  - name: deepseek-v3
    supports_thinking: true
    when_thinking_enabled:
      extra_body:
        thinking:
          type: enabled

Gemini with thinking via OpenAI-compatible gateway:

When routing Gemini through an OpenAI-compatible proxy (Vertex AI OpenAI compat endpoint, AI Studio, or third-party gateways) with thinking enabled, the API attaches a thought_signature to each tool-call object returned in the response. Every subsequent request that replays those assistant messages must echo those signatures back on the tool-call entries or the API returns:

HTTP 400 INVALID_ARGUMENT: function call `<tool>` in the N. content block is
missing a `thought_signature`.

Standard langchain_openai:ChatOpenAI silently drops thought_signature when serialising messages. Use deerflow.models.patched_openai:PatchedChatOpenAI instead — it re-injects the tool-call signatures (sourced from AIMessage.additional_kwargs["tool_calls"]) into every outgoing payload:

models:
  - name: gemini-2.5-pro-thinking
    display_name: Gemini 2.5 Pro (Thinking)
    use: deerflow.models.patched_openai:PatchedChatOpenAI
    model: google/gemini-2.5-pro-preview   # model name as expected by your gateway
    api_key: $GEMINI_API_KEY
    base_url: https://<your-openai-compat-gateway>/v1
    max_tokens: 16384
    supports_thinking: true
    supports_vision: true
    when_thinking_enabled:
      extra_body:
        thinking:
          type: enabled

For Gemini accessed without thinking (e.g. via OpenRouter where thinking is not activated), the plain langchain_openai:ChatOpenAI with supports_thinking: false is sufficient and no patch is needed.

Tool Groups

Organize tools into logical groups:

tool_groups:
  - name: web          # Web browsing and search
  - name: file:read    # Read-only file operations
  - name: file:write   # Write file operations
  - name: bash         # Shell command execution

Tools

Configure specific tools available to the agent:

tools:
  - name: web_search
    group: web
    use: deerflow.community.tavily.tools:web_search_tool
    max_results: 5
    # api_key: $TAVILY_API_KEY  # Optional

Built-in Tools:

• web_search - Search the web (Tavily)
• web_fetch - Fetch web pages (Jina AI)
• ls - List directory contents
• read_file - Read file contents
• write_file - Write file contents
• str_replace - String replacement in files
• bash - Execute bash commands

Sandbox

DeerFlow supports multiple sandbox execution modes. Configure your preferred mode in config.yaml:

Local Execution (runs sandbox code directly on the host machine):

sandbox:
   use: deerflow.sandbox.local:LocalSandboxProvider # Local execution

Docker Execution (runs sandbox code in isolated Docker containers):

sandbox:
   use: deerflow.community.aio_sandbox:AioSandboxProvider # Docker-based sandbox

Docker Execution with Kubernetes (runs sandbox code in Kubernetes pods via provisioner service):

This mode runs each sandbox in an isolated Kubernetes Pod on your host machine's cluster. Requires Docker Desktop K8s, OrbStack, or similar local K8s setup.

sandbox:
   use: deerflow.community.aio_sandbox:AioSandboxProvider
   provisioner_url: http://provisioner:8002

When using Docker development (make docker-start), DeerFlow starts the provisioner service only if this provisioner mode is configured. In local or plain Docker sandbox modes, provisioner is skipped.

See Provisioner Setup Guide for detailed configuration, prerequisites, and troubleshooting.

Choose between local execution or Docker-based isolation:

Option 1: Local Sandbox (default, simpler setup):

sandbox:
  use: deerflow.sandbox.local:LocalSandboxProvider

Option 2: Docker Sandbox (isolated, more secure):

sandbox:
  use: deerflow.community.aio_sandbox:AioSandboxProvider
  port: 8080
  auto_start: true
  container_prefix: deer-flow-sandbox

  # Optional: Additional mounts
  mounts:
    - host_path: /path/on/host
      container_path: /path/in/container
      read_only: false

Skills

Configure the skills directory for specialized workflows:

skills:
  # Host path (optional, default: ../skills)
  path: /custom/path/to/skills

  # Container mount path (default: /mnt/skills)
  container_path: /mnt/skills

How Skills Work:

• Skills are stored in deer-flow/skills/{public,custom}/
• Each skill has a SKILL.md file with metadata
• Skills are automatically discovered and loaded
• Available in both local and Docker sandbox via path mapping

Title Generation

Automatic conversation title generation:

title:
  enabled: true
  max_words: 6
  max_chars: 60
  model_name: null  # Use first model in list

Environment Variables

DeerFlow supports environment variable substitution using the $ prefix:

models:
  - api_key: $OPENAI_API_KEY  # Reads from environment

Common Environment Variables:

• OPENAI_API_KEY - OpenAI API key
• ANTHROPIC_API_KEY - Anthropic API key
• DEEPSEEK_API_KEY - DeepSeek API key
• NOVITA_API_KEY - Novita API key (OpenAI-compatible endpoint)
• TAVILY_API_KEY - Tavily search API key
• DEER_FLOW_CONFIG_PATH - Custom config file path

Configuration Location

The configuration file should be placed in the project root directory (deer-flow/config.yaml), not in the backend directory.

Configuration Priority

DeerFlow searches for configuration in this order:

1. Path specified in code via config_path argument
2. Path from DEER_FLOW_CONFIG_PATH environment variable
3. config.yaml in current working directory (typically backend/ when running)
4. config.yaml in parent directory (project root: deer-flow/)

Best Practices

1. Place config.yaml in project root - Not in backend/ directory
2. Never commit config.yaml - It's already in .gitignore
3. Use environment variables for secrets - Don't hardcode API keys
4. Keep config.example.yaml updated - Document all new options
5. Test configuration changes locally - Before deploying
6. Use Docker sandbox for production - Better isolation and security

Troubleshooting

"Config file not found"

• Ensure config.yaml exists in the project root directory (deer-flow/config.yaml)
• The backend searches parent directory by default, so root location is preferred
• Alternatively, set DEER_FLOW_CONFIG_PATH environment variable to custom location

"Invalid API key"

• Verify environment variables are set correctly
• Check that $ prefix is used for env var references

"Skills not loading"

• Check that deer-flow/skills/ directory exists
• Verify skills have valid SKILL.md files
• Check skills.path configuration if using custom path

"Docker sandbox fails to start"

• Ensure Docker is running
• Check port 8080 (or configured port) is available
• Verify Docker image is accessible

Examples

See config.example.yaml for complete examples of all configuration options.