# Independent Code Review — #756 Official Discord Channel Plugin

**Verdict: APPROVE**

## Scope reviewed

Complete current uncommitted #756 delta: multi-binding trusted agent selection, privileged ingress-route validation, attachment validation/persistence/resume, egress route lifecycle and idempotency, concurrent gateway stream state, Discord lifecycle/thread/rate behavior, compatibility ingress, and tests.

## Review result

No blocking or change-request finding remains.

- **Trusted multi-agent routing:** each binding requires a provisioned `agentConfigId`; the gateway resolves that config server-side, verifies its logical-agent name, and never accepts a Discord-controlled agent selection or applies generic routing to Discord ingress.
- **Auth and route integrity:** allowlist, pairing, role, and canonical logical-agent/channel-or-thread conversation-route validation occur before gateway processing. Privileged approval/stop paths use the same binding and route validation.
- **Attachments:** ingress rejects malformed, over-bounded, credential-bearing, fragment-bearing, or query-bearing URLs. Valid attachment metadata, including `sizeBytes`, persists and is reconstructed into resume history as explicitly untrusted context.
- **Discord reliability:** the adapter supports degraded Socket.IO reconnect, parent/thread routing semantics, bounded pre-side-effect ingress rates, and terminal response-route cleanup. Egress validates route/message alignment, sends deterministic nonces, distinguishes permanent from transient errors, and uses bounded retries.
- **Concurrent state:** per-client/conversation keys isolate listener, redaction, tool, and stream state for simultaneous threads sharing a Discord socket; disconnect cleanup covers all associated conversations.
- **Harness neutrality:** contracts retain logical-agent/channel data only; no harness/provider identity leaks into adapter routes or message boundaries.

## Verification performed

- `git diff --check` — passed.
- `pnpm --filter @mosaicstack/discord-plugin typecheck` — passed.
- `pnpm --filter @mosaicstack/discord-plugin lint` — passed.
- `pnpm --filter @mosaicstack/discord-plugin test` — passed: 44 tests; coverage 92.18% statements/lines, 86.55% branches, 100% functions (all ≥85% threshold).
- `pnpm --filter @mosaicstack/gateway typecheck` — passed.
- `cd apps/gateway && pnpm exec vitest run src/plugin/discord-ingress.security.spec.ts src/chat/chat.gateway-redaction.spec.ts src/__tests__/integration/tess-cross-surface.integration.test.ts` — passed: 32 tests.
