Design your API interfaces to be provider-agnostic rather than tightly coupled to specific service providers. This improves flexibility, maintainability, and makes future provider changes less disruptive. Key practices: 1. Use generic naming conventions for constants, functions, and types 2. Centralize common API interaction code in core modules 3. Use configuration objects to inject provider-specific details 4. Create abstractions that can work with multiple providers Example - Instead of: ```rust const OPENAI_STREAM_IDLE_TIMEOUT_MS: u64 = 300_000; const OPENAI_STREAM_MAX_RETRIES: u64 = 10; // Direct provider-specific implementation async fn generate_summary(transcript: &[TranscriptEntry], model: &str) -> Result { // Provider-specific implementation let api_key = get_openai_api_key()?; let url = "https://api.openai.com/v1/chat/completions"; // Rest of implementation... } ``` Prefer: ```rust const DEFAULT_STREAM_IDLE_TIMEOUT_MS: u64 = 300_000; const DEFAULT_STREAM_MAX_RETRIES: u64 = 10; // Provider-agnostic implementation using configuration async fn generate_summary( transcript: &[TranscriptEntry], model: &str, config: &Config, ) -> Result { // Use configuration for provider details let api_key = config.get_api_key()?; let base = config.model_provider.base_url.trim_end_matches('/'); let url = format!("{}/chat/completions", base); // Rest of implementation... } ``` This approach makes your codebase more resilient to changes in provider APIs and allows for easier testing and switching between different service providers.