Automation library · Content

Review Terraform pull requests with GitHub and OpenAI

Started by an event in a connected app, and works across GitHub, Postgres and Slack. It puts OpenAI behind a retrieval step, so answers are drawn from documents you supply rather than from the model alone. 20 steps, 2 branches, 1 loop or waits: a working afternoon to understand properly.

MediumCalls a model: OpenAIRetrieval

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20 stepsMedium: a working afternoon
2Branches: places the flow splits
1Loop or waits
3Services it connects to

The flow

Starts it 1Model 7Logic 5Service 7

The steps in the order they run, from what starts it.

  1. 1GitHub Trigger - PR Opened/UpdatedGithub triggerStarts it
  2. 2Tool - Run Terraform PlanTool Http RequestModel
  3. 3Tool - Run Security ScanTool Http RequestModel
  4. 4Tool - Estimate Cost ImpactTool Http RequestModel
  5. 5Tool - RAG Search IaC StandardsTool Vector StoreModel
  6. 6OpenAI Chat ModelLm Chat Open AiModel
  7. 7Window Buffer MemoryMemory Buffer WindowModel
  8. 8Set - ConfigSetLogic
  9. 9AI Agent - Terraform ReviewerAgentModel
  10. 10Get - PR DiffGithubService
  11. 11Set - Parse Agent OutputSetLogic
  12. 12Postgres - Log PR ReviewPostgresService
  13. 13GitHub - Post Review CommentGithubService
  14. 14IF - Review PassedIfLogic
  15. 15GitHub - Approve PR (auto)GithubService
  16. 16Slack - Request Security ReviewSlackService
  17. 17Wait - For Security Sign-OffWaitLogic
  18. 18IF - Security ApprovedIfLogic
  19. 19GitHub - Approve PR (delayed)GithubService
  20. 20GitHub - Request ChangesGithubService

How it's built

Starts on
An event in a connected app
Steps
20, with 2 branches, 1 loop or waits
Size
Medium: a working afternoon
Connects to
GitHub, Postgres, Slack
Model
OpenAI
Retrieval
Answers are drawn from documents you supply, not from the model alone

Questions

What does it need to run?

An n8n account, plus your own GitHub, Postgres and Slack accounts, and a key for OpenAI. You connect your own accounts after importing it; none are included.

What starts it?

It starts on an event in a connected app.

Does it use AI?

Yes. It calls OpenAI. Its answers draw on documents you give it, not on the model alone. Model calls are billed by the provider, not by n8n.

How long does it take to set up?

Plan an afternoon. 20 steps is enough that you should read each one before running it.

How do I import it?

Copy the workflow, open a new workflow in n8n and paste. The steps appear on the canvas, ready for your own accounts.

Before you run it

Nothing here has been tested by us. It is somebody's working automation, read and described from its own steps. Treat the connections it wants as a list of accounts it will touch, and read the 20 steps before you point it at anything that matters.