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 agentmods add rules/mission69b/t2000/financial-amountsgit clone --depth 1 https://github.com/mission69b/t2000Wrote 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/rules/mission69b/t2000/financial-amounts)<a href="https://agentmods.dev/rules/mission69b/t2000/financial-amounts"><img src="https://agentmods.dev/badge/rules/mission69b/t2000/financial-amounts.svg" alt="Measured on agentmods" 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 | $0.00288 | $0.00288 |
| Opus 5 | $0.00144 | $0.00144 |
| Sonnet 5 | $0.00058 | $0.00058 |
| Haiku 4.5 | $0.00029 | $0.00029 |
Grade A, and why
financial-amounts 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 4d 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.
What it actually says
Financial Amounts → .claude/skills/t2000-financial-amounts/SKILL.md
The invariants:
- Floor, never round. Any amount shown to a user or passed to an SDK builder
must be ≤ the actual on-chain balance.
Math.roundcan round up and produce more raw units than the user holds → "Insufficient balance". - Decimals are registry data, never call-site literals. Read them from
COIN_REGISTRY/SUPPORTED_ASSETSinpackages/sdk/src/token-registry.ts+constants.ts. Never create a second token map.
Read the full detail before touching amount math or token metadata:
.claude/skills/t2000-financial-amounts/SKILL.md — per-token display precision,
chip/preset math for tiny balances, and the canonical-source table.
(Content moved there 2026-07-24, merged with the former token-data-architecture
rule — do not re-inline it here; this file is a pointer so Cursor and Claude Code
cannot drift.)
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.
- 4d ago First seen · 24 lines · 288 tokens per session scan A 033653004090
financial-amounts is a cursor rule published in the GitHub repository mission69b/t2000 (23 stars, last pushed yesterday), licensed MIT. It adds 288 tokens to every session, about $0.0014 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 2026-08-30.
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