#66 [FEATURE] Add support for Claude Code

Is your feature request related to a problem? Please describe.

Currently, Strix requires LLM API keys (OpenAI, Anthropic API, etc.) which adds operational overhead - managing API keys, tracking usage/costs, and dealing with rate limits. I'm always frustrated when I need to expose API keys in CI/CD environments or when running security assessments on air-gapped systems. Additionally, for developers already using Claude Code for agentic development, it would be more convenient to use a single tool instead of managing separate API integrations.

Describe the solution you'd like

Add support for Claude Code as an LLM provider option. Claude Code is Anthropic's command-line tool for agentic coding that provides a more integrated developer experience without requiring direct API key management.

Configuration example:

# Instead of
export STRIX_LLM="anthropic/claude-sonnet-4-20250514"
export LLM_API_KEY="sk-ant-..."

# Use
export STRIX_LLM="claude-code/claude-sonnet-4.5"
strix --target ./app-directory

This would allow Strix to leverage Claude Code's existing authentication and session management, providing:

No need to expose API keys in environment variables
Better integration with existing Claude Code workflows
Simplified setup for developers already using Claude Code
Potential for better token usage optimization through Claude Code's session management

Describe alternatives you've considered

Local LLM via LMStudio/Ollama - Works but requires significant local resources and doesn't match the quality of Claude models
API proxy service - Building a middleware service to abstract API key management, but this adds unnecessary complexity
Environment-specific key rotation - Using secrets management tools (Vault, AWS Secrets Manager), but still requires API key exposure at runtime
Wrapper scripts - Creating shell scripts that inject API keys, but this is a workaround rather than a proper solution

Additional context

Claude Code is particularly well-suited for security testing workflows as it provides:

Better handling of long-running agentic tasks
Improved code analysis capabilities

This would make Strix more accessible to security teams and developers who prefer CLI-first workflows and already use Claude Code for development tasks.

Reference: https://docs.claude.com/en/docs/intro