Pattern Proposal: Provider Adapter Strategy

Summary

LLM clients are abstracted behind a common interface, allowing different providers (LiteLLM, Mock) to be swapped.

Candidate Pattern

• ID: provider-adapter-strategy
• Classification: architectural
• Maturity: emerging
• Type: emerging

Observed Signals

No specific signals listed.

Evidence

Supporting Evidence

• src/cas_runner/llm/litellm_client.py (LiteLLMClient)
• src/cas_runner/llm/mock_client.py (MockLLMClient)

Scope Assessment

• Evidence Strength: medium
• Confidence: medium
• Applies to: ideas-to-life-cas

Rationale

• Intent: Decouple the core runner from concrete LLM implementation details.
• Context: Runner uses LLM client via interface; multiple implementations exist.
• Force: Need for testability
• Force: Support multiple providers
• Force: Isolate I/O

Traceability

Artifact source: proposed-patterns