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openspec/changes/enterprise-gaming-api-plugin-anticheat/proposal.md

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+# OpenSpec Change: enterprise-gaming-api-plugin-anticheat
+
+- **Change ID**: enterprise-gaming-api-plugin-anticheat
+- **Package**: `@suaveplan/api-plugin-anticheat`
+- **Category**: gaming/server
+- **Target path**: `gaming/server/api-plugin-anticheat`
+- **Status**: PROPOSED
+- **Date**: 2026-04-24
+- **Reference spec**: `/mnt/s/web/suaveplan/enterprise/api-plugin-anticheat.md`
+
+---
+
+## Summary
+
+Deliver `@suaveplan/api-plugin-anticheat` on the genesis branch from scratch at enterprise quality. The package provides server-side anti-cheat validation with speed, damage, action-rate, and teleport checks. A `ViolationTracker` records per-player violations with severity 1–10, decays accumulated violations over time, and computes a running trust score (starting at 100). When the trust score drops below the ban threshold, the tracker fires `anticheat:ban` event. HTTP routes expose reporting and admin endpoints. Genesis adds Zod violation schemas, structured errors, OTel violation counter, injectable clock, and 100% coverage.
+
+---
+
+## Current-state audit (genesis)
+
+Package does not exist on genesis yet — fresh build.
+
+---
+
+## Available workspace deps on genesis
+
+| Package | Role |
+|---|---|
+| `@suaveplan/error` (`workspace:^`) | `AntiCheatError`; `AC.*` codes |
+| `@suaveplan/types` (`workspace:^`) | `Clock` |
+| `@suaveplan/events` (`workspace:^`) | `anticheat:violation`, `anticheat:ban`, `anticheat:flag` events |
+| `zod` (`catalog:forms`) | `Violation`, `CheckConfig` schemas |
+| `@opentelemetry/api` (`catalog:observability`) | Violation counter, ban counter |
+
+---
+
+## Public API surface
+
+```ts
+type ViolationType = 'speed' | 'damage' | 'action_rate' | 'teleport' | 'custom'
+
+interface Violation {
+  playerId: string
+  type: ViolationType
+  severity: number    // 1–10
+  data?: unknown
+  timestamp: number
+}
+
+interface CheckConfig {
+  maxSpeed?: number             // m/s
+  maxDamagePerSecond?: number
+  maxActionsPerSecond?: number
+  maxTeleportDistance?: number  // meters
+  banThreshold?: number         // trust score, default 30
+  decayRatePerSecond?: number   // violation decay, default 0.1
+}
+
+function createViolationTracker(config: CheckConfig, options?: { clock?: Clock }): ViolationTracker
+
+interface ViolationTracker {
+  check(playerId: string, type: ViolationType, value: number): void
+  addViolation(violation: Violation): void
+  getTrustScore(playerId: string): number
+  getViolations(playerId: string): Violation[]
+  isBanned(playerId: string): boolean
+  tick(dt: number): void   // decay violations
+  reset(playerId: string): void
+}
+```
+
+### HTTP Routes
+
+| Method | Path | Description |
+|---|---|---|
+| `POST` | `/check` | Submit player action for validation |
+| `GET` | `/players/:id/score` | Get trust score |
+| `GET` | `/players/:id/violations` | List violations |
+| `DELETE` | `/players/:id/violations` | Reset violations (admin) |
+| `POST` | `/ban/:id` | Manual ban |
+
+---
+
+## File layout
+
+```text
+gaming/server/api-plugin-anticheat/
+  package.json
+  tsconfig.json
+  vitest.config.ts
+  src/
+    index.ts
+    error-codes.ts
+    types/common.ts
+    types/common.md
+    core/
+      violation-tracker/
+        violation-tracker.ts
+        violation-tracker.md
+        violation-tracker.types.ts
+        violation-tracker.test.ts
+        index.ts
+    routes/
+      anticheat.ts
+      anticheat.md
+    plugin.ts
+    plugin.md
+  tests/
+    integration.test.ts
+```
+
+---
+
+## Impact
+
+**Downstream**: `@suaveplan/api-plugin-game-server` hooks ban events to session kick. Prerequisites: `@suaveplan/error`, `@suaveplan/types`, `@suaveplan/events`.