tstack

Billing team for Claude Code.

tstack is a monetization team for usage-based SaaS products. Two layers: a design chain that builds billing systems from scratch (7 skills, artifact-chained), and a review team that audits, operates, and monitors billing that exists (15 skills, reactive). Derived from real self-serve billing operations.

Install

git clone https://github.com/tansohq/tstack.git
cd tstack
./setup

The setup script symlinks tstack into ~/.claude/skills/tstack and verifies the skills are accessible. Run it again anytime — it's idempotent.

The Chain (Design Workflow)

Run /monetization-engineer to design a billing system from scratch. It walks you through the chain:

meter → pricing → enforcement → credits → [hierarchy] → reconciliation → integration

Skill	What it does	Artifact
/monetization-engineer	Orchestrate the billing design chain	—
/meter-design	Define billing units, event schemas, aggregation	METER.md
/pricing-model	Structure plan tiers, feature packaging, pricing	PLAN.md
/entitlement-enforcement	Design allow/deny logic, hard/soft limits	ENFORCEMENT.md
/credit-ledger	Prepaid credit pools, grants, drawdown, expiry	CREDITS.md
/account-hierarchy	Parent/child accounts, per-key budgets [optional]	HIERARCHY.md
/reconciliation	Usage-to-billing drift detection and true-up	RECONCILIATION.md
/provider-integration	Map design to Stripe subscriptions and invoices	INTEGRATION.md

Each skill writes a structured markdown artifact that the next skill reads. Decisions accumulate — every downstream skill has full context from upstream choices.

The Team (Review & Operations)

Run any team skill directly. They read chain artifacts (if they exist) or work from your description of an existing billing system.

Review / Audit

Skill	Lens	What it does
/billing-reviewer	Backend dev	Audit for race conditions, double-charges, idempotency gaps
/stripe-correctness	Backend dev	Detect 14 Stripe API footguns — webhooks, proration, state machine, currency
/state-machine-guard	Backend dev	Extract and audit subscription state transitions, missing side effects, races
/metering-correctness	Backend dev	Find idempotency gaps, recursion loops, clock skew, and aggregation bugs in usage metering
/pricing-auditor	Rev ops / finance	Evaluate unit economics, margins, competitive position
/billing-qa	QA	Generate edge case test scenarios (proration, timezone, currency)
/alignment-check	Cross-functional	Check pricing vs sales motion, enterprise vs self-serve conflicts

Operations

Skill	Lens	What it does
/billing-operations	Support / ops / CS	Account lifecycle + credit management playbooks
/migration-planner	PM	Plan pricing changes with grandfathering and rollback

Intelligence

Skill	Lens	What it does
/revenue-reporter	Finance	MRR/ARR, revenue recognition with credits, churn decomposition
/account-intelligence	CS / growth	Account health, churn risk, PQL scoring, credit run-out
/api-health-analyst	Reliability	Per-account error rates, customer vs platform error attribution

Observability

Skill	Lens	What it does
/billing-observability	On-call / SRE	Monitoring, alerting, drift detection, incident investigation

Design & Research

Skill	Lens	What it does
/billing-ux-designer	Design	Usage dashboards, plan picker, credit run-out display
/pricing-researcher	Market intel	Competitive pricing teardowns and model precedent research

How It Works

Nothing touches your codebase. Chain skills produce markdown artifacts. Team skills produce findings and recommendations. No code generated, no deployments, no Stripe changes. Read the output, decide if you agree, implement on your own terms.

When a skill hits a judgment call (hard vs soft limit, billing unit, pricing model, overage behavior), it stops and surfaces the tradeoff. Decisions are made by you, not silently resolved.

Build

bun install              # install dev dependencies
bun run build            # generate SKILL.md from templates
bun test                 # run validation tests
bun run gen:skill-docs --dry-run  # check template freshness

Skills are generated from .tmpl templates via a resolver pipeline. Edit the template, not the output.

About

Tanso's billing team skill pack for Claude Code. Inspired by gstack.