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.
npx skills add roedyrustam/vibes-plug --skill double-entry-ledger-fintech-expertgit clone --depth 1 https://github.com/roedyrustam/vibes-plugWrote 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.
[](https://agentmods.dev/skills/roedyrustam/vibes-plug/double-entry-ledger-fintech-expert)<a href="https://agentmods.dev/skills/roedyrustam/vibes-plug/double-entry-ledger-fintech-expert"><img src="https://agentmods.dev/badge/skills/roedyrustam/vibes-plug/double-entry-ledger-fintech-expert/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.
<a href="https://agentmods.dev/skills/roedyrustam/vibes-plug/double-entry-ledger-fintech-expert"><img src="https://agentmods.dev/badge/skills/roedyrustam/vibes-plug/double-entry-ledger-fintech-expert.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00079 | $0.03377 |
| Opus 5.5 | $0.00032 | $0.01351 |
| Sonnet 5.5 | $0.00016 | $0.00675 |
| Haiku 4.5 | $0.00008 | $0.00338 |
Grade A, and why
double-entry-ledger-fintech-expert scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 286 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Double-Entry Ledger & FinTech Core Accounting Expert (2026 Edition)
English
Orchestration & Integration
- Payment Gateways & Settlement:
doku-payment-gateway,payment-gateway-expert,saas-billing,agentic-m2m-settlement,agentic-micro-economy-architect - Database & Concurrency Locks:
database-orm-expert,supabase-security-expert - Formal Verification & Security:
formal-spec-z3-verifier,zero-trust-secret-vault,anti-slop - Lifecycle & Governance:
brainstorming,zero-to-prod-orchestrator,session-memory-manager
Description
Mission-critical financial engineering guide for designing immutable Double-Entry Accounting Ledgers. Never track money using a mutable users.balance = users.balance - 100 column alone. Covers append-only journal entries, zero-sum balanced postings ($\sum \text{Debits} = \sum \text{Credits}$), two-phase pending/posted escrow holds, TigerBeetle high-throughput financial accounting, integer minor-unit arithmetic (BIGINT), and daily webhook-to-ledger reconciliation.
Trigger Conditions
- Building digital wallets, marketplace escrow systems, split payouts, or M2M agent clearing houses.
- Recording payment gateway webhooks (DOKU SNAP BI, Stripe, Xendit) into an auditable internal ledger.
- Implementing two-phase authorization holds (pending balance vs available balance).
- Preventing floating-point rounding bugs (
0.1 + 0.2 !== 0.3) and race-condition double-spends.
Core Ledger Invariants
| Invariant | Mathematical / Architectural Rule | Enforcement Mechanism |
|---|---|---|
| I-01: Zero-Sum Conservation | Every transaction must contain $\ge 2$ postings where $\sum \text{debits} - \sum \text{credits} = 0$. | Database trigger + application transaction check |
| I-02: Strict Immutability | ledger_transactions and ledger_entries are strictly append-only (INSERT only). Corrections require a compensating reversal entry. |
PostgreSQL BEFORE UPDATE OR DELETE trigger raising exception |
| I-03: Integer Minor Units | Store all monetary values as BIGINT in minor units (e.g., IDR sen/rupiah, USD cents). FLOAT/DOUBLE are strictly forbidden. |
BIGINT NOT NULL CHECK (amount_minor > 0) |
| I-04: Canonical Lock Ordering | Lock accounts in deterministic ascending UUID order (ORDER BY id ASC FOR UPDATE) to eliminate AB-BA database deadlocks. |
Sorted SELECT ... FOR UPDATE query |
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.
- yesterday Changed · +115 lines 8eed5d876278
- 2d ago First seen · 171 lines · 79 tokens per session scan A cabf97587f8b
double-entry-ledger-fintech-expert is a skill published in the GitHub repository roedyrustam/vibes-plug (113 stars, last pushed yesterday), licensed MIT. It adds 79 tokens to every session and 3,377 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-10-24.
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