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Safety stock review with planner approval

Recalculates safety stock and reorder points for a product category in plain code, then has the model explain each change and the working capital it frees or adds. A planner approves or rejects every decision by email before it reaches the purchase order queue.

OperationsWorks with n8n · Make+1Community example

What it does

  • Pulls demand, lead time and cost per SKU from the catalog
  • Computes safety stock, reorder point and working capital delta in code, at the current service level
  • Has the model explain the result in plain language as strict JSON, marking confidence low if parsing fails
  • Stamps each decision with an ID and timestamp and sends it for approval
  • Logs the approve or reject outcome; a rejection closes the decision with no change

Your approval boundaries

Approval required

These actions always wait for your yes:

  • Approving each safety stock change before it enters the purchase order queue

You decide what happens next.

More about this workflow

This setup is for operators and managers who keep the busywork moving. It takes a repeat chore off your plate and hands back something you can check quickly.

First, it pulls demand, lead time and cost per SKU from the catalog. Next, it computes safety stock, reorder point and working capital delta in code, at the current service level. Then it has the model explain the result in plain language as strict JSON, marking confidence low if parsing fails. After that, it stamps each decision with an ID and timestamp and sends it for approval. Finally, it logs the approve or reject outcome; a rejection closes the decision with no change. It works with your spreadsheets, email and automation platform, each on its own login with limited access.

You get the prep work done and waiting for you. The agent stops and asks for your yes before approving each safety stock change before it enters the purchase order queue, and says plainly if a step cannot be undone.

“the language model never computes an inventory number.”
ameya147-da ameya147-da on GitHub · Sep 23, 2026
Before you startSpreadsheets · Email accessScoped permissionsn8n or Make
Explore required tools and model recommendations

Tools and access

  • Google Sheets

    Handles the spreadsheets part of this job. Grant access to the single sheet it needs.

    API required: Yes. Needs a Google Cloud OAuth app or a service account with the Sheets API turned on.

  • Gmail

    Handles the email part of this job. Grant read-only plus compose (drafts) scopes.

    API required: Yes. Needs a Google Cloud project with an OAuth app and the Gmail API turned on. The agent signs in through OAuth with only the scopes you pick.

  • n8n

    Handles the automation platform part of this job. Grant create workflows, left inactive until reviewed.

    API required: Yes. Needs an n8n API key from settings. New workflows should stay inactive until you review them.

Official links only. Not sponsored, no affiliate links.

Model recommendations

Best pick

GPT-6.1 Sol

Cheap cached input suits jobs that rerun the same instructions each week.

$2 per million input tokens, $10 per million output tokens, for prompts up to 272K tokens. Longer prompts cost $4 in and $15 out.

OpenAI docs as of October 11, 2026

Cheaper backup

Gemini 3.5 Flash-Lite

Low cost for simple data pulls and matching.

$0.30 per million input tokens, $2.50 per million output tokens.

Google docs as of October 11, 2026

Our own picks. Not sponsored, no affiliate links.

Build your prompt

Add your details, then copy the prompt into your tool.

1Your details

Fill these in and the prompt updates as you type.

per SKU or category

2Your prompt

4 of 4 still empty
Fill these in before you run it: [PRODUCT CATEGORY] [SERVICE LEVEL TARGETS: per SKU or category] [DEMAND HISTORY SOURCE] [APPROVER EMAIL] You are the Safety stock review with planner approval agent. Recalculates safety stock and reorder points for a product category in plain code, then has the model explain each change and the working capital it frees or adds. A planner approves or rejects every decision by email before it reaches the purchase order queue. Use only the details filled in above. If any [BRACKETED] item is still blank or unclear, stop and ask for it first. Do not guess. What you do on your own: - Pulls demand, lead time and cost per SKU from the catalog - Computes safety stock, reorder point and working capital delta in code, at the current service level - Has the model explain the result in plain language as strict JSON, marking confidence low if parsing fails - Stamps each decision with an ID and timestamp and sends it for approval - Logs the approve or reject outcome; a rejection closes the decision with no change What you must never do without a yes from a person: - Approving each safety stock change before it enters the purchase order queue Rules: - Before any step on the list above, stop and ask. Say in plain words what you want to do, who it affects, and whether it can be undone. - If something cannot be undone, say so first, in one short line. - Write drafts, not final actions. A person sends, pays, posts, or deletes. - Keep a short log of every action you took and every source you read. - If you are unsure, ask instead of guessing.
View run instructionsPaste into: n8n, Make, Claude Code

Your answers stay in this browser only.

Run your workflow

Connect your tools with only the access this setup needs, then follow these steps.

Steps

Do these in order. Test on old data before it touches live work.

  1. 1Connect Google Sheets with its own login, not yours. Grant access to the single sheet it needs.
  2. 2Connect Gmail with its own login, not yours. Grant read-only plus compose (drafts) scopes.
  3. 3Connect n8n with its own login, not yours. Grant create workflows, left inactive until reviewed.
  4. 4Paste the prompt where your harness takes instructions. See the note under the Copy button.
  5. 5Do a dry run on old or test data first. Check every draft and every stop point by hand before you let it near live work.
  6. 6Read its log after the first real run. Only widen access once a week of runs looks clean.

Safeguards and trust score

The score describes this example setup’s access, approval boundaries, ability to undo changes, and scope.

Access18 / 30

Can draft things that send or spend, so it sits close to risky actions.

Human approval27 / 30

Waits for a yes on: approving each safety stock change before it enters the purchase order queue.

Undo and logs14 / 20

Proposes changes to live records, so the setup needs a change log and a way back.

Scope16 / 20

Runs on its own login across 3 tools. Fewer connections means a smaller blast radius.

How to raise it

  • Access: Take away its ability to send, post or spend. Let it only write drafts, and have a person press send or pay from their own account +6
  • Human approval: Add a second named stop next to "approving each safety stock change before it enters the purchase order queue", so every step that leaves your hands waits for a yes, and have the confirm say plainly what cannot be undone +3
  • Undo and logs: Stop it from editing live records. Have it write the change as a proposal you apply, and keep a log of every change with a way to roll it back +3

Do all of these to reach 87, up from 75.

Want help getting there? Get an AI Trust Audit from Pixeldesigns

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