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cmux-billing — Claude Code skill: what it does, how to install

Runbook for cmux billing architecture covering Stripe Checkout, subscription tiers, webhooks, and entitlement overrides during backend development.

Install into Claude Code · Skills CLI (Vercel) All methods and platforms ↓ 
npx skills add manaflow-ai/cmux --skill cmux-billing -a claude-code
Open on GitHub

What cmux-billing does

This skill provides context for editing billing workflows inside cmux. It maps out Stripe Checkout session generation via /api/billing/checkout, customer portal sessions, and idempotent recording in web/services/billing/purchase.ts. Inbound events at /api/stripe/webhook verify signatures, discard payloads where metadata.app is not set to cmux, and return a 500 status on failure to ensure Stripe retries.

Entitlement checks inspect Stack metadata where cmuxVmPlan overrides the mirrored cmuxPlan. Admin endpoints at /api/admin/* require verified company domains or explicit admin records. Running email grant operations before executing the admin_plan_grants database migration causes endpoints to return 503 errors.

What it helps with

  • trace Stripe Checkout session creation and customer portal flows
  • test checkout locally with dev-stack.sh and the CMUXDEV100 coupon
  • debug idempotent Stripe webhook processing and event filtering
  • grant or reset dev entitlements using dev-grant.sh and dev-reset.sh

Example prompts for the agent

  • Explain how resolveProPlanStatus evaluates cmuxVmPlan against cmuxPlan
  • How do I simulate a free checkout in development using the CMUXDEV100 coupon?
  • Trace the webhook handling flow in web/services/billing/purchase.ts

How to install cmux-billing

1Skills CLI (Vercel)

npx skills add manaflow-ai/cmux --skill cmux-billing -a claude-code

2Manually: put the files in place

~/.claude/skills/cmux-billing/SKILL.md

Copy the whole skill folder; for one project use .claude/skills/cmux-billing/

From the same set13

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Questions about cmux-billing

How to install cmux-billing in Claude Code?

Install it by running npx skills add manaflow-ai/cmux --skill cmux-billing -a claude-code. The file will be placed in ~/.claude/skills/cmux-billing/SKILL.md.

What is cmux-billing used for?

It acts as a technical runbook for coding against cmux billing endpoints, Stripe subscriptions, plan catalogs, and admin grant tools.

How do you test payments locally without real charges?

You can apply cmuxVmPlan: "pro" directly using web/scripts/stripe/dev-grant.sh <email> or apply the CMUXDEV100 100%-off coupon during test-mode checkout.

See also

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