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claude.md

On first message: Briefly introduce yourself with "how to talk to me" - explain 80% confidence threshold, when to just execute vs ask, and preferred communication style (terse with metrics). Keep it 3-4 lines max.

Mission: Fintech-grade, deterministic. J/E/A trilayer correctness before features. Pure functions only. ALWAYS: bun run check before commit. Test in browser F12 console. Never swallow errors.

🚫 ZERO TOLERANCE: NO HACKS, NO WORKAROUNDS

ABSOLUTE RULE - violation = stop and report immediately:

  1. NO "temporary" solutions - if you write a stub/hack/workaround, STOP and tell user explicitly
  2. NO silent compromises - if proper fix is unclear/hard, ASK before making shortcuts
  3. NO "it works for now" - either fix properly or document limitation + get approval
  4. NO hiding uncertainty - if confidence <80% on implementation approach, STOP and discuss

Examples of BANNED patterns:

// ❌ NEVER: Stub that "returns fake data but works for testMode"
async registerEntities() { return [2,3,4]; }  // Not actually registering!

// ❌ NEVER: Conditional skip of broken logic
if (value !== '0') { updateState(); }  // Hiding root cause!

// ❌ NEVER: "I'll fix this later" comments
// TODO: Implement proper state persistence  // No! Fix now or ask.

What TO do instead:

  • Stop coding
  • Explain the blocker clearly: "EntityProvider registration fails because @ethereumjs/vm state doesn't persist after runTx"
  • Present options: "A) Debug VM state, B) Workaround in contract, C) Different approach"
  • Get user decision
  • Then implement properly

Remembered from 2025-12-29 session: Spent 2+ hours on hacks (fake registration, event patches, ownReserve='0' conditionals) instead of stopping and asking. User found out from Opus review. Never again.

🎲 DETERMINISM: NO RANDOMNESS IN RJEA FLOW

PROHIBITED in Runtime/Entity/Account/Jurisdiction cascade:

  • Date.now() - use env.timestamp (controlled)
  • Math.random() - use deterministic PRNG with seed
  • setInterval/setTimeout - use tick-based delays (env.timestamp checks)
  • crypto.randomBytes() - use seeded generator

Only allowed in:

  • UI layer (visualization, not state)
  • Initial setup (before any frames)
  • External I/O (user input timestamps)

RJEA flow must be pure: (prevEnv, inputs) → nextEnv - same inputs = same outputs, always.

CRITICAL OVERRIDES

Do not create mocks/stubs unless asked. Use real integration. When debugging consensus/state-machines, dump entire data/JSON. Use bun everywhere (not npm/node).

ALWAYS run bun run check before reporting completion. NEVER create .md files in /runtime or /frontend - documentation goes in /docs.

🎯 AGENTIC MODE (80% Confidence Threshold)

Before starting ANY task, rate confidence (0-100%):

  • ≥80%: Proceed autonomously (clear spec, obvious approach)
  • <80%: Stop and ask (multiple valid paths, UX unclear, architectural choice)

Break rules: Always ask even if >80% for consensus/crypto/smart-contract changes.

Quick iteration signals (full autonomy):

  • "slow/sluggish" → profile + fix, report metrics
  • "ugly/meh" → polish matching past aesthetic
  • "go/just try" → full send, zero questions

📋 RESPONSE FORMAT (ADHD-Optimized)

  • ASCII headers to separate sections visually
  • Bullets only, max 3-5 per section, no paragraphs >3 lines
  • Cut preamble/postamble/hedging
  • Always end with clear next steps: NEXT: A) B) C)

🎯 TOKEN EFFICIENCY

  • Grep/offset before reading files >300 lines (NetworkTopology.svelte has function index at 163-282)
  • Filter command output: grep -E "error|FAIL", never dump full output
  • Agents for architecture, not verification
  • Terse confirmations with metrics: "Fixed. 0.2→45 FPS"
  • Check imports before reading (no imports = delete, don't analyze)

🚨 BROWSER BUILD

bun build runtime/runtime.ts --target=browser --external http --external https --external zlib --external fs --external path --external crypto --external stream --external buffer --external url --external net --external tls --external os --external util (runtime.ts runs in browser, never --target node)

✅ VERIFICATION PROTOCOL

Everywhere in code: fail-fast and loud (full stop + throw popup on error).

Before claiming anything works:

  1. Run bun run check and show output
  2. Test the specific functionality (browser + F12 console)
  3. Show command output, not descriptions ("Fixed" → show passing tests)
  4. Reproduce user's error before fixing
  5. Never commit untested code

🎯 TYPESCRIPT

Validate at source. Fail fast. Trust at use. No defensive ?. in UI if validated upstream.

📝 COMMUNICATION MODE

When I ask "why/how/what do you think" or say "let's discuss" - give full analysis with reasoning. Default to conversation over terse responses. Thinking out loud is the task, not overhead.

🏗️ CODING PRINCIPLES

Functional/declarative paradigm. Pure functions. Immutability. Small composable modules (<30 lines/func, <300 lines/file). DRY via abstraction. Bun everywhere (never npm/node/pnpm except frontend).

🔧 Critical Bug Prevention

BigInt serialization: Use safeStringify() from serialization-utils.ts (never raw JSON.stringify) Buffer comparison: Use buffersEqual() from serialization-utils.ts (not Buffer.compare) Contract addresses: Use getAvailableJurisdictions() from evm.ts (never hardcode) Bilateral consensus: Study .archive/2024_src/app/Channel.ts for state verification patterns

📁 STRUCTURE

Core: /runtime. Contracts: /jurisdictions. UI: /frontend. Docs: /docs. Reference: .archive/2024_src/app/Channel.ts

🛠️ PATTERNS

Auto-rebuild: bun run dev. Time-travel: read from env not live stores. Bilateral: left=lower entityId (lexicographic).

🔍 DEBUGGING RUNTIME STATE

Two-mode debugging system (ASCII + JSON):

ASCII Mode (Quick Scan)

# Run scenario with full output
bun runtime/scenarios/lock-ahb.ts > /tmp/debug.log

# Grep for specific info
grep "Entity.*Alice" /tmp/debug.log        # Find Alice's state
grep "HTLC.*Pending" /tmp/debug.log        # Find pending locks
grep "Frame 65" /tmp/debug.log             # Find specific frame

ASCII functions (runtime/runtime-ascii.ts):

  • formatRuntime(env) - Full env with hierarchical boxes
  • formatEntity(state) - Single entity with accounts
  • formatAccount(account, myId) - Bilateral account detail
  • On assert fail: auto-dumps full runtime state

JSON Mode (Deep Analysis)

# Scenarios auto-dump JSON to /tmp/ on completion:
# - /tmp/{scenario}-frames.json (all history frames)
# - /tmp/{scenario}-final.json (final state)

# Query with jq
jq '.eReplicas[0][1].state | {entityId, height, lockBook: (.lockBook | length)}' /tmp/lock-ahb-final.json

# Find entities with fees
jq '.eReplicas[] | select(.[1].state.htlcFeesEarned != "BigInt(0)")' /tmp/lock-ahb-final.json

# Extract specific account deltas
jq '.eReplicas[0][1].state.accounts | to_entries[0].value.deltas' /tmp/lock-ahb-final.json

# Compare frames (diff two states)
diff <(jq '.eReplicas[0][1].state.lockBook' /tmp/frame-65.json) <(jq ... /tmp/frame-70.json)

Browser console (F12):

xln.debug.dumpRuntime()  // ASCII to console
xln.formatEntity(xln.getEnv().eReplicas.values().next().value.state)

When debugging consensus issues: Dump both sides, diff the JSON to find divergence point.

💾 Memories

  • tx shortcut acceptable in crypto
  • Channel.ts is reference implementation
  • frontend is UI only, runtime for logic (expose helpers via runtime.ts)
  • localhost:8080 only entry point
  • lowercase .md filenames (next.md, readme.md)
  • "xln" lowercase always, never "XLN"
  • Debug with ASCII (quick scan) + JSON (deep analysis) - both auto-dumped on scenario completion

🔍 EXTERNAL AUDIT RULE

Never blindly trust subagent or external audit findings.

Before accepting any finding:

  1. Verify the claim against actual code paths
  2. Check if "vulnerability" is actually intentional design
  3. Verify exploit is possible given XLN's specific nonce/state model
  4. Ask: does this finding understand XLN's bilateral consensus model?

Example bullshit patterns:

  • "Signature malleability → double spend" (ignores nonces)
  • "State transfer without verification" (ignores hash = state binding)
  • "Single-signer bypasses X" (that's the design for threshold=1)
  • Generic ECDSA/BFT concerns that don't apply to XLN's specific flow

Rule: 80% of audit findings are noise. Find the 20% that matter.