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Quickstart
# config.yaml
settings:
  persist_cache: true
  logs_dir: "blast-logs/"      # Log to files (null for terminal-only)
  blastai_log_level: "info"    # BLAST engine log level
  browser_use_log_level: "info" # Browser operations log level

# Start BLAST with your config
blastai serve --config config.yaml

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LLM Provider

Configure which models to use and their API keys: 
constraints:
  # For OpenAI models:
  llm_model: "openai:gpt-4.1"           # Main model for complex tasks
  llm_model_mini: "openai:gpt-4.1-mini" # Model for simpler tasks

  # For Google Gemini models:
  llm_model: "google_genai:gemini-2.0-flash-exp"
  llm_model_mini: "google_genai:gemini-2.0-flash-exp"
API keys can be provided in three ways:
  1. Environment variables:
export OPENAI_API_KEY=sk-...
export OPENAI_BASE_URL=https://your-endpoint.com  # Optional
export GOOGLE_API_KEY=AIza...  # Get from aistudio.google.com
  1. .env file:
# For OpenAI models
OPENAI_API_KEY=sk-...
OPENAI_BASE_URL=https://your-endpoint.com  # Optional

# For Google Gemini models
GOOGLE_API_KEY=AIza...  # Get from aistudio.google.com
  1. Command line:
blastai serve --env="OPENAI_API_KEY=sk-..."
blastai serve --env="GOOGLE_API_KEY=AIza..."
The system automatically detects the model provider from the prefix (openai: or google_genai:) and uses the appropriate API key.

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Secrets

settings:
  secrets_file_path: "secrets.env"  # Path to secrets file
The secrets file can contain usernames and passwords for web apps BLAST may need to access: 
jira_username=calebwin
jira_password=akjgvowi

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Browser

settings:
  local_browser_path: "none"  # Path to Chrome/Chromium binary
The local_browser_path setting accepts these values:
  • "none" (default) - Use system-installed browser
  • "auto" - Auto-detect browser location
  • "/path/to/browser" - Specific browser binary path

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Caching

settings:
  persist_cache: false  # Persist cache between serving sessions

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Logging

Control logging behavior and verbosity: 
settings:
  # Log file directory (set to null to log to terminal only)
  logs_dir: "blast-logs/"

  # Component log levels
  blastai_log_level: "debug"    # Logging level for BLAST
  browser_use_log_level: "info" # Logging level for browser_use
When logs_dir is set (default: “blast-logs/”):
  • All logs go to files based on their levels
  • Only engine metrics shown in terminal
  • Log file paths shown in endpoint messages
When logs_dir is null:
  • All logs go to terminal based on their levels
  • Engine metrics are not shown
Available log levels (from most to least verbose):
  • "debug" - Detailed debugging information
  • "info" - General information
  • "warning" - Warning messages
  • "error" - Error messages only
  • "critical" - Critical errors only

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Next Steps