{"product_id":"n8n-ai-agent-governance-openai-pgvector-postgres-gmail","title":"n8n AI Agent Governance: OpenAI, pgvector Postgres \u0026 Gmail","description":"\u003ch3\u003eGoverned AI answers in n8n—webhook to OpenAI with Postgres\/pgvector grounding, verification, and Gmail delivery\u003c\/h3\u003e\n\u003cp\u003eThis n8n AI Agent Governance workflow accepts a webhook prompt, screens it for prompt-injection risk, grounds responses using a Postgres\/pgvector knowledge base, verifies the output with a second OpenAI pass, optionally routes high-risk results for human approval, and then sends the verified answer to a recipient via Gmail.\u003c\/p\u003e\n\n\u003ch3\u003eWhat this workflow does\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReceives and normalizes webhook input\u003c\/strong\u003e (including optional \u003cem\u003erequestedTools\u003c\/em\u003e) into a tracked, governed request.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrompt-injection and secret-exfiltration screening\u003c\/strong\u003e blocks suspicious requests based on common risky patterns.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGrounding with OpenAI embeddings + Postgres\/pgvector\u003c\/strong\u003e: generates an embedding for the prompt, retrieves similar evidence from a \u003cem\u003eknowledge_base\u003c\/em\u003e, and stops if results don’t meet the grounding threshold.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePolicy-bound OpenAI chat prompting\u003c\/strong\u003e requiring citations of retrieved sources and enforcing a tool allowlisting gateway with risk tiering and optional human approval.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIndependent verification\u003c\/strong\u003e using a second OpenAI verifier to check grounding, unsupported claims, policy violations, and leakage—retrying with repair instructions up to the configured limit if verification fails.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eToken budgeting, risk scoring, and audit logging\u003c\/strong\u003e: enforces a token budget, classifies risk, routes high-risk outputs to a human approval queue, and writes an audit record to Postgres.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDelivers the final verified response via Gmail\u003c\/strong\u003e to a configured recipient.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eUse cases\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eCustomer-support or internal assistants that must stay grounded in a curated knowledge base.\u003c\/li\u003e\n  \u003cli\u003eSaaS operators needing safer LLM automation with audit trails and controlled tool usage.\u003c\/li\u003e\n  \u003cli\u003eTeams deploying n8n AI agents that require verification and optional human approval for higher-risk answers.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical details\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntegrations\/nodes\u003c\/strong\u003e: webhook, OpenAI (chat + embeddings + verifier), postgres, pgvector (via Postgres knowledge base), gmail, if, code, sticky note.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"N8N Commerce","offers":[{"title":"Default Title","offer_id":46072079286451,"sku":"N8N-19790","price":13.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0749\/6279\/6723\/files\/BMhv-eV547nOxEMjQiObk_iO3Lw2ek.png?v=1790068257","url":"https:\/\/buyflowscripts.com\/products\/n8n-ai-agent-governance-openai-pgvector-postgres-gmail","provider":"N8N Commerce","version":"1.0","type":"link"}