LiteLLM Provider Adapter (providers/litellm.ts)

Adapter exposing LiteLLM models to the Vercel AI SDK, defining rate limits, capabilities and model metadata for LLM integration.

// Source: https://github.com/lemony-ai/cascadeflow | License: MIT | Copyright 2025 Lemony Inc
// Provided via justclaw.it.com; keep this notice with the code.
import { createProviderAdapter } from './base';

export const liteLLMAdapter = createProviderAdapter({
  id: 'litellm',
  label: 'LiteLLM',
  envKeys: ['LITELLM_API_KEY'],
  defaultBaseUrl: 'https://api.litellm.ai/v1',
  rateLimit: {
    requestsPerMinute: 120,
    tokensPerMinute: 150000,
    concurrency: 15,
  },
  capabilities: {
    streaming: true,
    tools: true,
  },
  models: [
    {
      id: 'openai/gpt-4o-mini',
      label: 'OpenAI GPT-4o Mini (via LiteLLM)',
      cost: { input: 0.00015, output: 0.0006 },
      contextWindow: 128000,
      supportsTools: true,
    },
    {
      id: 'anthropic/claude-3-5-sonnet-2024102

... (truncated -- full source via MCP)