What is webhook-reliability?

A checklist for checking whether Stripe payment notifications, called webhooks, arrive and are handled correctly. Webhooks are messages Stripe sends to an application when events such as payments or subscription changes occur.

Use it to audit subscription checkout, renewals, failed invoices, plan changes, cancellations, and other Stripe webhook flows.

It helps find failed deliveries, missing event handlers, and duplicate-processing risks that can leave payments and user access out of sync.

webhook-reliability — Skill for Claude Code and Codex by appeeky

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add appeeky/stripe-skills --skill webhook-reliability

Clone the repo

git clone --depth 1 https://github.com/appeeky/stripe-skills

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/appeeky/stripe-skills/webhook-reliability/github.svg)](https://agentmods.dev/skills/appeeky/stripe-skills/webhook-reliability)

Your own site

<a href="https://agentmods.dev/skills/appeeky/stripe-skills/webhook-reliability"><img src="https://agentmods.dev/badge/skills/appeeky/stripe-skills/webhook-reliability/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/appeeky/stripe-skills/webhook-reliability"><img src="https://agentmods.dev/badge/skills/appeeky/stripe-skills/webhook-reliability.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 52 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 367 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00052	$0.00367
Opus 5	$0.00026	$0.00183
Sonnet 5	$0.00010	$0.00073
Haiku 4.5	$0.00005	$0.00037

Measured 8d ago against content hash 9a33f377dcf6, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

webhook-reliability scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/webhook-reliability/SKILL.md · 47 lines

What it actually says

Webhook Reliability

Stripe MCP Setup

Requires Stripe MCP connected via OAuth or restricted key. Docs: https://docs.stripe.com/mcp

GetMcpTools with server: "user-Stripe" (or plugin-stripe-stripe) before any call
Prefer stripe_api_search → stripe_api_details → stripe_api_read for list/retrieve
Always paginate — limit: 100, follow has_more with starting_after
Amounts are in cents unless noted
Never expose secret keys in output

Workflow

Dashboard: Developers → Webhooks → recent deliveries (user may paste errors)
Codebase grep: stripe.webhooks, checkout.session.completed, customer.subscription, invoice.payment_failed
Required events for subscription SaaS:

Event	Purpose
`checkout.session.completed`	Provision access
`customer.subscription.updated`	Plan/status sync
`customer.subscription.deleted`	Revoke access
`invoice.payment_failed`	Dunning email / banner
`invoice.paid`	Confirm renewal

Output Template

Webhook Audit

Endpoint(s): [urls from code]
Handled events: [list]
Missing critical: [list]
Failed deliveries (if known): [summary]

Fix priority:
1. ...

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

8d ago First seen · 47 lines · 52 tokens per session scan A 9a33f377dcf6

Subscribe to this mod's changes

webhook-reliability is a skill published in the GitHub repository appeeky/stripe-skills (5 stars, last pushed 1mo ago), licensed MIT. It adds 52 tokens to every session and 367 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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