Agent skill
ledger
Financial ledger - transactions, audit trails. Use when tracking money.
Install this agent skill to your Project
npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/other/ledger-sylphxai-flow
SKILL.md
Ledger Guideline
Tech Stack
- Database: Neon (Postgres)
- ORM: Drizzle
Non-Negotiables
- Balances must be immutable ledger (append-only), not mutable fields
- No floating-point for money (use deterministic precision)
- All financial mutations must be idempotent
- Every balance must be provable by replaying the ledger
Context
Ledger handles financial integrity — transaction history, balance correctness, audit trail. Payment processing lives in billing, pricing strategy lives in pricing.
A bug that creates or destroys money is a serious incident. This must be bulletproof.
Driving Questions
- Does a balance/credits system exist, and is it implemented correctly?
- Where could money be created or destroyed by a bug?
- What happens during concurrent transactions?
- How would we detect if balances drifted from reality?
- Can we prove every balance by replaying the ledger?
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