Squad Test

.squad/templates/cooperative-rate-limiting.md

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+# Cooperative Rate Limiting for Multi-Agent Deployments
+
+> Coordinate API quota across multiple Ralph instances to prevent cascading failures.
+
+## Problem
+
+The [circuit breaker template](ralph-circuit-breaker.md) handles single-instance rate limiting well. But when multiple Ralphs run across machines (or pods on K8s), each instance independently hits API limits:
+
+- **No coordination** — 5 Ralphs each think they have full API quota
+- **Thundering herd** — All Ralphs retry simultaneously after rate limit resets
+- **Priority inversion** — Low-priority work exhausts quota before critical work runs
+- **Reactive only** — Circuit opens AFTER 429, wasting the failed request
+
+## Solution: 6-Pattern Architecture
+
+These patterns layer on top of the existing circuit breaker. Each is independent — adopt one or all.
+
+### Pattern 1: Traffic Light (RAAS — Rate-Aware Agent Scheduling)
+
+Map GitHub API `X-RateLimit-Remaining` to traffic light states:
+
+| State | Remaining % | Behavior |
+|-------|------------|----------|
+| 🟢 GREEN | >20% | Normal operation |
+| 🟡 AMBER | 5–20% | Only P0 agents proceed |
+| 🔴 RED | <5% | Block all except emergency P0 |
+
+```typescript
+type TrafficLight = 'green' | 'amber' | 'red';
+
+function getTrafficLight(remaining: number, limit: number): TrafficLight {
+  const pct = remaining / limit;
+  if (pct > 0.20) return 'green';
+  if (pct > 0.05) return 'amber';
+  return 'red';
+}
+
+function shouldProceed(light: TrafficLight, agentPriority: number): boolean {
+  if (light === 'green') return true;
+  if (light === 'amber') return agentPriority === 0; // P0 only
+  return false; // RED — block all
+}
+```
+
+### Pattern 2: Cooperative Token Pool (CMARP)
+
+A shared JSON file (`~/.squad/rate-pool.json`) distributes API quota:
+
+```json
+{
+  "totalLimit": 5000,
+  "resetAt": "2026-03-22T20:00:00Z",
+  "allocations": {
+    "picard": { "priority": 0, "allocated": 2000, "used": 450, "leaseExpiry": "2026-03-22T19:55:00Z" },
+    "data": { "priority": 1, "allocated": 1750, "used": 200, "leaseExpiry": "2026-03-22T19:55:00Z" },
+    "ralph": { "priority": 2, "allocated": 1250, "used": 100, "leaseExpiry": "2026-03-22T19:55:00Z" }
+  }
+}
+```
+
+**Rules:**
+- P0 agents (Lead) get 40% of quota
+- P1 agents (specialists) get 35%
+- P2 agents (Ralph, Scribe) get 25%
+- Stale leases (>5 minutes without heartbeat) are auto-recovered
+- Each agent checks their remaining allocation before making API calls
+
+```typescript
+interface RatePoolAllocation {
+  priority: number;
+  allocated: number;
+  used: number;
+  leaseExpiry: string;
+}
+
+interface RatePool {
+  totalLimit: number;
+  resetAt: string;
+  allocations: Record<string, RatePoolAllocation>;
+}
+
+function canUseQuota(pool: RatePool, agentName: string): boolean {
+  const alloc = pool.allocations[agentName];
+  if (!alloc) return true; // Unknown agent — allow (graceful)
+  
+  // Reclaim stale leases from crashed agents
+  const now = new Date();
+  for (const [name, a] of Object.entries(pool.allocations)) {
+    if (new Date(a.leaseExpiry) < now && name !== agentName) {
+      a.allocated = 0; // Reclaim
+    }
+  }
+  
+  return alloc.used < alloc.allocated;
+}
+```
+
+### Pattern 3: Predictive Circuit Breaker (PCB)
+
+Opens the circuit BEFORE getting a 429 by predicting when quota will run out:
+
+```typescript
+interface RateSample {
+  timestamp: number;  // Date.now()
+  remaining: number;  // from X-RateLimit-Remaining header
+}
+
+class PredictiveCircuitBreaker {
+  private samples: RateSample[] = [];
+  private readonly maxSamples = 10;
+  private readonly warningThresholdSeconds = 120;
+
+  addSample(remaining: number): void {
+    this.samples.push({ timestamp: Date.now(), remaining });
+    if (this.samples.length > this.maxSamples) {
+      this.samples.shift();
+    }
+  }
+
+  /** Predict seconds until quota exhaustion using linear regression */
+  predictExhaustion(): number | null {
+    if (this.samples.length < 3) return null;
+
+    const n = this.samples.length;
+    const first = this.samples[0];
+    const last = this.samples[n - 1];
+    
+    const elapsedMs = last.timestamp - first.timestamp;
+    if (elapsedMs === 0) return null;
+    
+    const consumedPerMs = (first.remaining - last.remaining) / elapsedMs;
+    if (consumedPerMs <= 0) return null; // Not consuming — safe
+    
+    const msUntilExhausted = last.remaining / consumedPerMs;
+    return msUntilExhausted / 1000;
+  }
+
+  shouldOpen(): boolean {
+    const eta = this.predictExhaustion();
+    if (eta === null) return false;
+    return eta < this.warningThresholdSeconds;
+  }
+}
+```
+
+### Pattern 4: Priority Retry Windows (PWJG)
+
+Non-overlapping jitter windows prevent thundering herd:
+
+| Priority | Retry Window | Description |
+|----------|-------------|-------------|
+| P0 (Lead) | 500ms–5s | Recovers first |
+| P1 (Specialists) | 2s–30s | Moderate delay |
+| P2 (Ralph/Scribe) | 5s–60s | Most patient |
+
+```typescript
+function getRetryDelay(priority: number, attempt: number): number {
+  const windows: Record<number, [number, number]> = {
+    0: [500, 5000],     // P0: 500ms–5s
+    1: [2000, 30000],   // P1: 2s–30s
+    2: [5000, 60000],   // P2: 5s–60s
+  };
+  
+  const [min, max] = windows[priority] ?? windows[2];
+  const base = Math.min(min * Math.pow(2, attempt), max);
+  const jitter = Math.random() * base * 0.5;
+  return base + jitter;
+}
+```
+
+### Pattern 5: Resource Epoch Tracker (RET)
+
+Heartbeat-based lease system for multi-machine deployments:
+
+```typescript
+interface ResourceLease {
+  agent: string;
+  machine: string;
+  leaseStart: string;
+  leaseExpiry: string;  // Typically 5 minutes from now
+  allocated: number;
+}
+
+// Each agent renews its lease every 2 minutes
+// If lease expires (agent crashed), allocation is reclaimed
+```
+
+### Pattern 6: Cascade Dependency Detector (CDD)
+
+Track downstream failures and apply backpressure:
+
+```
+Agent A (rate limited) → Agent B (waiting for A) → Agent C (waiting for B)
+                         ↑ Backpressure signal: "don't start new work"
+```
+
+When a dependency is rate-limited, upstream agents should pause new work rather than queuing requests that will fail.
+
+## Kubernetes Integration
+
+On K8s, cooperative rate limiting can use KEDA to scale pods based on API quota:
+
+```yaml
+apiVersion: keda.sh/v1alpha1
+kind: ScaledObject
+spec:
+  scaleTargetRef:
+    name: ralph-deployment
+  triggers:
+  - type: external
+    metadata:
+      scalerAddress: keda-copilot-scaler:6000
+      # Scaler returns 0 when rate limited → pods scale to zero
+```
+
+See [keda-copilot-scaler](https://github.com/tamirdresher/keda-copilot-scaler) for a complete implementation.
+
+## Quick Start
+
+1. **Minimum viable:** Adopt Pattern 1 (Traffic Light) — read `X-RateLimit-Remaining` from API responses
+2. **Multi-machine:** Add Pattern 2 (Cooperative Pool) — shared `rate-pool.json`
+3. **Production:** Add Pattern 3 (Predictive CB) — prevent 429s entirely
+4. **Kubernetes:** Add KEDA scaler for automatic pod scaling
+
+## References
+
+- [Circuit Breaker Template](ralph-circuit-breaker.md) — Foundation patterns
+- [Squad on AKS](https://github.com/tamirdresher/squad-on-aks) — Production K8s deployment
+- [KEDA Copilot Scaler](https://github.com/tamirdresher/keda-copilot-scaler) — Custom KEDA external scaler