All loops
FinanceMedium 11 min· claude-sonnet-4-5
Outbound invoice sanity check
Catch wrong tax rates and bad line items before the invoice sends.
NOT DEPLOYEDNOT DEPLOYED
0148ms
Trigger
POST https://hooks.claudeloops.run/stripe-invoice-anomaly · event=stripe.customer.subscription.created
02808ms
Agent
claude-sonnet-4-5 · in 908 tok · out 231 tok
03198ms
Tools
stripe-mcp/anthropic:messages.create → 200 OK · 228ms
0438ms
Verify
schema check · zod v3 passed
0568ms
Output
slack #finance · anomaly flagged
0628ms
Notify
audit log written · runbook link attached
SUCCESS
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0 runs
P50
0ms
median
P95
0ms
tail
AVG COST
—
per run
LAST OK
never
—
LAST FAIL
never
none
Latency · last 30 runs0 samples
no runs yet
Latest output · what your users see
Invoice · AnthropicInfra
$3,528.78 USD
// press Test to run once · Watch live to keep streaming · Deploy to make it real
The problem
A misconfigured tax rate or wrong proration once a quarter costs you a refund and a customer trust hit.
The outcome
Bad invoices never send. They go to a `#billing-review` Slack channel with the suspect lines highlighted.
Ingredients & skills
Secrets
- ANTHROPIC_API_KEY
- STRIPE_KEY
- STRIPE_WEBHOOK_SECRET
- SLACK_WEBHOOK_URL
Providers
- Anthropic
- Stripe
- Slack
MCP servers
- stripe-mcp
#finance#stripe#billing
How it works
Stripe webhook on `invoice.finalized` but before `invoice.sent`. Claude validates against your billing rules, blocks send if anything looks wrong.
Step 1
1 — Rules file
Plain English. Claude validates each invoice against it.
billing-rules.md
- US customers: tax rate must be Stripe Tax automatic, never manual.
- EU customers: VAT id required on invoice metadata.
- Annual plan proration is forbidden — must use credit notes.
- Any line item with `amount > $50,000` requires a metadata key `approved_by`.Step 2
2 — Validate
If `block: true`, void and recreate as draft.
One-line deploy
The button above runs the same command with your saved config. This is the raw CLI form.
bash
locker deploy invoice-guard --trigger stripe-webhook https://hooks.claudeloops.run/stripe-invoice-anomaly
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