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Execution pattern
Prevent multi-channel overselling
Stop the same last unit selling twice.
What executes
The final unit of an item is sold on two channels within the same sync window.
What normally goes wrong
Inventory sync is eventually consistent and checkout is immediate. The oversell is created in the gap, then paid for in cancellations and marketplace defect rates.
The decision
The signals available at the moment of the action, and the rule that judges them.
Signals
- Live inventory at the instant of checkout
- Units already committed but not yet decremented
- Channel the order arrived on
The gate
Validate live availability at the millisecond of checkout rather than trusting the last sync.
ALLOW
The order commits against real stock.
ESCALATE
An ambiguous count waits on ops.
BLOCK
The order is refused before it becomes a cancellation.
Four stages left to right. Input signals — user or agent identity, context and data, tools and resources, spend and budget, policies, history and reputation, and environment — enter the Decionis Protocol. Inside, the protocol normalizes context and intent, evaluates policies and rules, runs a deterministic risk and policy engine, and explains the reason and evidence. It emits a verdict: ALLOW (authorized), ESCALATE (needs approval or more info), or BLOCK (high risk or out of policy). The verdict drives an enforcement action: allow, block, require approval, or throttle and limit. Every decision is recorded for audit, learning, and continuous improvement.
5 policies implement this pattern
Fork one and change the thresholds. Available today on 5 platforms.
Shopify Oversell Prevention
Blocks fulfilling an order for stock oversold across channels — before the fulfillment token is issued.
shopify
Amazon Oversell & Fee Gate
Blocks fulfilling an order for stock oversold across channels, and checks referral plus fulfillment fees against the margin floor.
amazon
Commerce & Retail Ops Pack
Over-selling, margin-floor, and coupon-stacking gates for orders and fulfillment — the three that leak the most money.
bigcommerce
TikTok Shop Fulfillment Circuit Breaker
Stops a viral-spike order releasing on stock you do not have, or on a creator-commission stack that breaks margin.
tiktok shop
Walmart Referral-Fee Margin Gate
Folds the Walmart Marketplace referral fee into the margin gate before an order is acknowledged.
walmart
Related concepts
This pattern is one answer to each of these.
What to do next
The same five steps for every pattern in the library.
- Simulate this recipe
Run the policy against a realistic action in the browser. Push it past what the rules allow and watch the verdict come back. No account.
- View the signed Decision Dossier
See exactly what was decided and why: the rule that fired, the evidence it read, the policy version in force, and an Ed25519 signature you can verify yourself.
- Deploy in shadow mode
Measure what the policy would have caught on your own traffic without touching the live path. Every recipe defaults to shadow, so the first deployment carries no execution risk.
- Connect a real workflow
Point the same policy at the system where the action actually originates — a checkout, an ERP posting, a Zap, an agent's tool call.
- Share the verified result
Publish the proof: a public verification link, an embeddable badge, a PR comment, or an anonymized shadow-mode finding. This is how the next person discovers Decionis.