# Frameworks and RAG

Blekline governs **prompts and tool calls at ingress**. Frameworks and vector DBs stay downstream — Blekline masks before data enters agent context or tool arguments.

## Comparison

| Integration | Type | Doc |
|-------------|------|-----|
| [LangChain](/docs/integrations/langchain-stack) | Framework | Chain + tools |
| [LlamaIndex](/docs/integrations/llamaindex-stack) | Framework | Query engine |
| [PydanticAI](/docs/integrations/pydantic-ai-stack) | Framework | Typed agents |
| [TaskWeaver](/docs/integrations/taskweaver-stack) | Framework | Code plugins |
| [Relevance AI](/docs/integrations/relevance-ai-stack) | Framework | Agent chains |
| [Supabase](/docs/integrations/supabase-stack) | Vector | pgvector |
| [Chroma](/docs/integrations/chroma-stack) | Vector | Embeddings |
| [Pinecone](/docs/integrations/pinecone-stack) | Vector | Managed index |
| [Contextual AI](/docs/integrations/contextual-ai-stack) | Vector | Enterprise RAG |

## Pattern

```text
User query → Blekline mask → Framework / RAG → Tools (via mcp-proxy policy) → Models
```

Do not pass raw PII in embedding queries. Use [MCP proxy](/docs/mcp/proxy) to enforce retrieval/write tool policy.

---

**Next steps:** [MCP proxy](/docs/mcp/proxy) · [TypeScript SDK](/docs/sdk/typescript) · [Agent clients](/docs/integrations/agent-clients) · [Open workspace](https://app.blekline.com)