Automation library · Documents and files

Build a cost estimation chatbot with Mistral and OCR

Started by someone opening a chat with it, and works across Gmail and Supabase. It puts Mistral behind a retrieval step, so answers are drawn from documents you supply rather than from the model alone. 16 steps, 1 branch: a working afternoon to understand properly.

MediumCalls a model: MistralRetrieval

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16 stepsMedium: a working afternoon
1Branch: places the flow splits
0Loops or waits
2Services it connects to

The flow

Starts it 1Model 4Logic 4Service 7

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

  1. 1Mistral Cloud Chat Model4Lm Chat Mistral CloudModel
  2. 2Simple Memory1Memory Buffer WindowModel
  3. 3Calculator1Tool CalculatorModel
  4. 4When chat message receivedChat triggerStarts it
  5. 5Send a message in GmailGmail ToolService
  6. 6OCR (ANY OCR API )Http RequestService
  7. 7Supabase GetSupabase ToolService
  8. 8ai agent cost estimateAgentModel
  9. 9CHECK IF BINARY FILE IS PRESENT OR NOTIfLogic
  10. 10Split OutSplit OutLogic
  11. 11MergeMergeLogic
  12. 12NORMALIZE binary fileCodeLogic
  13. 13Mistral UploadHttp RequestService
  14. 14Mistral Signed URLHttp RequestService
  15. 15Mistral DOC OCRHttp RequestService
  16. 16STORE OCR OUTPUTSupabaseService

How it's built

Starts on
Someone opening a chat with it
Steps
16, with 1 branch
Size
Medium: a working afternoon
Connects to
Gmail, Supabase
Model
Mistral
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 Gmail and Supabase accounts, and a key for Mistral. You connect your own accounts after importing it; none are included.

What starts it?

It starts on someone opening a chat with it.

Does it use AI?

Yes. It calls Mistral. 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. 16 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 16 steps before you point it at anything that matters.