Borrowing it
Nothing to install: this file belongs to LedgerHQ/ledger-live. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/LedgerHQ/ledger-live/develop/.agents/skills/coin-families-contract/SKILL.mdgit clone --depth 1 https://github.com/LedgerHQ/ledger-liveWrote 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/ledgerhq/ledger-live/coin-families-contract)<a href="https://agentmods.dev/skills/ledgerhq/ledger-live/coin-families-contract"><img src="https://agentmods.dev/badge/skills/ledgerhq/ledger-live/coin-families-contract/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/ledgerhq/ledger-live/coin-families-contract"><img src="https://agentmods.dev/badge/skills/ledgerhq/ledger-live/coin-families-contract.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00063 | $0.01144 |
| Opus 5.5 | $0.00025 | $0.00458 |
| Sonnet 5.5 | $0.00013 | $0.00229 |
| Haiku 4.5 | $0.00006 | $0.00114 |
Grade A, and why
coin-families-contract 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 — 54 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Coin families contract (Desktop & Mobile UI)
Principle: Coin-specific UI and behavior must live in families/. Generic screens, hooks, and components must not branch on family === "evm" (or any family name). They must use the families contract: optional slots defined in the family type, implemented per family, and consumed via a single lookup (e.g. useLLDCoinFamily(currency.family).SlotName). This keeps generic code family-agnostic and supports modularisation and lazy loading.
Do not do (anti-patterns)
- Generic code (outside
families/<family>/):if (currency.family === "evm")/if (transaction.family === "solana")to render or behave differently.- Coin-specific hooks or logic in shared ViewModels / screens (e.g. Canton onboarding branch inside a generic Scan Device VM).
- Importing a specific coin module (e.g.
@ledgerhq/coin-canton) in generic UI to branch on that coin.
- Exception: Type-narrowing inside a family folder (e.g.
invariant(transaction.family === "bitcoin", "...")infamilies/bitcoin/) is acceptable; the rule applies to generic (shared) code only.
Do (correct pattern)
-
Define a slot on the contract
- Desktop: Add an optional property to
LLDCoinFamilyinapps/ledger-live-desktop/src/renderer/families/types.ts(e.g.NoAssociatedAccounts?: React.ComponentType<...>). - Mobile: Use the same idea: a typed contract (or generated map like
noAssociatedAccountsByFamily) that families can optionally fill.
- Desktop: Add an optional property to
-
Implement only in the family
- Put the component or logic in
families/<family>/(e.g.families/hedera/NoAssociatedAccounts.tsx) and add it to the family object (Desktop: the default export offamilies/<family>/index.ts, loaded on demand throughloaders.ts; Mobile: in the generated aggregation if applicable).
- Put the component or logic in
-
Use the contract in generic code
- Generic code looks up by family and uses the slot if present, with no
if (family === "hedera"): - Desktop:
useLLDCoinFamily(currency.family).NoAssociatedAccounts→ use it when defined. The hook lives inapps/ledger-live-desktop/src/renderer/families/useLLDCoinFamily.tsand is imported from~/renderer/families. It suspends while the family chunk loads, so it needs a<Suspense>boundary above it. Outside React,importLLDCoinFamily(name)from the same module returns a promise. - Mobile: e.g.
getCustomNoAssociatedAccounts(currency)returning a component from a family map, then pass it to the screen (e.g. asCustomNoAssociatedAccountsin route params).
- Generic code looks up by family and uses the slot if present, with no
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 · -2 tokens per session 5732ab8f5f8c
- 2mo ago First seen · 54 lines · 65 tokens per session scan A 08f9af4730dd
coin-families-contract is a skill published in the GitHub repository LedgerHQ/ledger-live (624 stars, last pushed yesterday), licensed MIT. It adds 63 tokens to every session and 1,144 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 2026-08-30.
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