AutistMask/RULES.md

> **⚠️ THIS FILE MUST NEVER BE MODIFIED BY AGENTS.** RULES.md is maintained
> exclusively by the project owner. AI agents, bots, and automated tools must
> treat this file as read-only. If an audit finds a divergence between the code
> and this file, the code must be changed to match — never the other way around.

# AutistMask Rules Checklist

This file is derived from README.md and REPO_POLICIES.md for use as an audit
checklist. The authoritative policies are in those two files. If this file
contradicts either, the originals govern.

---

## Cryptography

- [ ] No raw crypto primitives in application code (`aes`, `sha`, `pbkdf`,
      `hmac`, `encrypt`, `decrypt`, `hash`, `cipher`, `digest`, `sign`)
- [ ] All crypto goes through `ethers` or `libsodium-wrappers-sumo`
- [ ] No exceptions without an explicit code comment citing the Crypto Policy
- [ ] Secrets encrypted at rest with Argon2id + XSalsa20-Poly1305
- [ ] Password never used in address derivation (encryption only)

## External Communication

- [ ] Extension contacts exactly three external services: configured RPC
      endpoint, CoinDesk price API, and Blockscout block-explorer API
- [ ] No analytics, telemetry, or tracking
- [ ] No user-specific data sent except to the configured RPC endpoint
- [ ] No Infura/Alchemy hard dependency
- [ ] No backend servers operated by the developer
- [ ] RPC endpoint is user-configurable (defaults to publicnode.com)

## Dependencies

- [ ] Four runtime libraries only: `ethers`, `libsodium-wrappers-sumo`,
      `qrcode`, `ethereum-blockies-base64`
- [ ] No JS framework (React, Vue, Svelte, etc.)
- [ ] All external references pinned by cryptographic hash (per REPO_POLICIES)

## Address Display & Anti-Spoofing

- [ ] Addresses displayed in full in all critical contexts (tx confirmation,
      send confirmation, transaction detail)
- [ ] `truncateMiddle()` removes at most 10 characters — enforced in code
- [ ] Caller floor for address truncation is 32 characters minimum
- [ ] Clicking any address copies the full untruncated value
- [ ] Known token symbol verification: transfers claiming a known symbol from an
      unrecognized contract are filtered
- [ ] Tokens with < 1,000 holders hidden from tx history and send selector
- [ ] Dust transactions below configurable threshold hidden
- [ ] Fraud contract blocklist applied to tx history

## Display Consistency

- [ ] Token/ETH amounts: exactly 4 decimal places in all summary views
- [ ] Transaction detail view: exact untruncated amount (full precision)
- [ ] Transaction detail view: native quantity shown (wei / base units)
- [ ] Both amount and native quantity are click-copyable
- [ ] Timestamps: ISO datetime + relative age, everywhere they appear
- [ ] Same data formatted identically across all screens

## No Layout Shift

- [ ] All async-populated elements have `min-height` or placeholder content
- [ ] `formatUsd(null)` returns `""` — callers must use `&nbsp;` fallback
- [ ] `visibility: hidden` preferred over `display: none` when space must be
      preserved
- [ ] No UI element moves when async data (prices, balances, tx lists) arrives

## Clickable Affordance

- [ ] Every button has visible border, padding, and hover state
- [ ] Every clickable text element has underline or dashed underline
- [ ] No invisible hit targets

## DEBUG Mode

- [ ] DEBUG mode only enables: red banner + hardcoded test mnemonic
- [ ] No `if (DEBUG)` branches that skip functionality or bypass security
- [ ] New DEBUG conditionals require explicit project owner approval

## Transaction Decoding

- [ ] Decoding is best-effort display convenience only
- [ ] No protocol gets special handling beyond the confirmation screen
- [ ] If decoding fails, raw calldata displayed in full (not truncated)
- [ ] Decoders are self-contained modules in `src/shared/`

## Approval Flow

- [ ] Site connection: explicit user approval via popup
- [ ] Transaction signing: password required, decoded details shown
- [ ] Message signing: password required, message content shown
- [ ] Typed data signing: password required, domain/type/message fields shown
- [ ] Rejected approvals return EIP-1193 error code 4001
- [ ] TX and sign approvals persist across popup close/reopen (toolbar popup)

## Secrets & Storage

- [ ] Public data (xpubs, addresses, balances) stored unencrypted
- [ ] Private data (recovery phrases, private keys) encrypted at rest
- [ ] Password only required for signing operations
- [ ] No secrets in `.env`, credentials, or API keys committed to repo
- [ ] `git add -A` / `git add .` never used

## Build & Workflow

- [ ] All tool invocations via `make` targets, never directly
- [ ] `make check` = `make test` + `make lint` + `make fmt-check`
- [ ] `main` always passes `make check`
- [ ] Feature branches for all changes, merge to main when done
- [ ] No force-push to `main`
- [ ] Pre-commit hook runs `make check`

## Language & Labeling

- [ ] "Recovery phrase" not "seed phrase" or "mnemonic"
- [ ] "Address" not "account" or "derived key"
- [ ] "Password" not "encryption key" or "vault passphrase"
- [ ] Error messages are full sentences
- [ ] No competitor mentioned by name in code or documentation. Written
      exception: the injected provider in `src/content/inpage.js` sets the flag
      named after the other wallet to `true`, an interface-compatibility flag
      many dApps check (README.md, Policies)