diff --git a/.github/workflows/v2-lifecycle-contract.yml b/.github/workflows/v2-lifecycle-contract.yml
index bc13910..554a17c 100644
--- a/.github/workflows/v2-lifecycle-contract.yml
+++ b/.github/workflows/v2-lifecycle-contract.yml
@@ -6,6 +6,7 @@ on:
       - "src/source/opencode2/**"
       - "src/source/runtime/**"
       - "scripts/v2-event-bridge-test.mjs"
+      - "scripts/v2-event-stream-contract-test.mjs"
       - "scripts/v2-plugin-sentinel-test.mjs"
       - ".github/workflows/v2-lifecycle-contract.yml"
   push:
@@ -14,6 +15,7 @@ on:
       - "src/source/opencode2/**"
       - "src/source/runtime/**"
       - "scripts/v2-event-bridge-test.mjs"
+      - "scripts/v2-event-stream-contract-test.mjs"
       - "scripts/v2-plugin-sentinel-test.mjs"
       - ".github/workflows/v2-lifecycle-contract.yml"
 
@@ -40,5 +42,7 @@ jobs:
       - run: node --check src/source/opencode2/event-bridge.js
       - run: node --check src/source/opencode2/experimental.js
       - run: node --check scripts/v2-event-bridge-test.mjs
+      - run: node --check scripts/v2-event-stream-contract-test.mjs
       - run: node scripts/v2-event-bridge-test.mjs
+      - run: node scripts/v2-event-stream-contract-test.mjs
       - run: node scripts/v2-plugin-sentinel-test.mjs
diff --git a/scripts/v2-event-stream-contract-test.mjs b/scripts/v2-event-stream-contract-test.mjs
new file mode 100644
index 0000000..21a984b
--- /dev/null
+++ b/scripts/v2-event-stream-contract-test.mjs
@@ -0,0 +1,38 @@
+import assert from "node:assert/strict"
+import { createOpenCode2EventBridge } from "../src/source/opencode2/event-bridge.js"
+
+const delay = (ms) => new Promise((resolve) => setTimeout(resolve, ms))
+const seen = []
+let subscribeArgs = -1
+let cleanupCalls = 0
+
+async function* stream() {
+  yield {
+    directory: "/project",
+    payload: {
+      type: "session.created",
+      properties: { info: { id: "ses_stream", directory: "/project" } },
+    },
+  }
+}
+
+const bridge = createOpenCode2EventBridge({
+  directory: "/project",
+  onEvent: async (event) => seen.push(event),
+})
+
+await bridge.attach(async (...args) => {
+  subscribeArgs = args.length
+  return { stream: stream(), dispose: async () => { cleanupCalls += 1 } }
+})
+
+for (let attempt = 0; attempt < 50 && seen.length === 0; attempt++) await delay(5)
+assert.equal(subscribeArgs, 0)
+assert.equal(seen[0]?.action, "created")
+assert.ok(bridge.runtimeManager.peek("ses_stream"))
+
+assert.equal(await bridge.dispose(), true)
+assert.equal(cleanupCalls, 1)
+assert.equal(bridge.runtimeManager.peek("ses_stream"), undefined)
+
+console.log("OpenCode 2 event stream contract passed")