Share OpenCode local server for chat sessions

apps/server/src/provider/Layers/OpenCodeAdapter.test.ts

@@ -309,21 +309,48 @@ it.layer(OpenCodeAdapterTestLayer)("OpenCodeAdapterLive", (it) => {
     }),
   );
 
-  it.effect("requests an exclusive local server lease for chat sessions", () =>
+  it.effect("requests a shared local server lease for chat sessions", () =>
     Effect.gen(function* () {
       const adapter = yield* OpenCodeAdapter;
 
       yield* adapter.startSession({
         provider: ProviderDriverKind.make("opencode"),
-        threadId: asThreadId("thread-opencode-local-exclusive"),
+        threadId: asThreadId("thread-opencode-local-shared"),
         runtimeMode: "full-access",
       });
 
-      assert.deepEqual(runtimeMock.state.connectReuseLocalServer, [false]);
+      assert.deepEqual(runtimeMock.state.connectReuseLocalServer, [true]);
       assert.deepEqual(runtimeMock.state.sessionCreateUrls, ["http://127.0.0.1:4301"]);
     }).pipe(Effect.provide(OpenCodeAdapterLocalServerTestLayer)),
   );
 
+  it.effect("can keep multiple local OpenCode-backed chat sessions open", () =>
+    Effect.gen(function* () {
+      const adapter = yield* OpenCodeAdapter;
+
+      const first = yield* adapter.startSession({
+        provider: ProviderDriverKind.make("opencode"),
+        threadId: asThreadId("thread-opencode-local-first"),
+        runtimeMode: "full-access",
+      });
+      const second = yield* adapter.startSession({
+        provider: ProviderDriverKind.make("opencode"),
+        threadId: asThreadId("thread-opencode-local-second"),
+        runtimeMode: "full-access",
+      });
+
+      assert.equal(first.threadId, "thread-opencode-local-first");
+      assert.equal(second.threadId, "thread-opencode-local-second");
+      assert.deepEqual(runtimeMock.state.connectReuseLocalServer, [true, true]);
+      assert.deepEqual(runtimeMock.state.sessionCreateUrls, [
+        "http://127.0.0.1:4301",
+        "http://127.0.0.1:4301",
+      ]);
+      const sessions = yield* adapter.listSessions();
+      assert.equal(sessions.length, 2);
+    }).pipe(Effect.provide(OpenCodeAdapterLocalServerTestLayer)),
+  );
+
   it.effect("does not abort a resumed OpenCode session when concurrent starts race", () =>
     Effect.gen(function* () {
       const adapter = yield* OpenCodeAdapter;

apps/server/src/provider/Layers/OpenCodeAdapter.ts

@@ -1101,7 +1101,7 @@ export function makeOpenCodeAdapter(
                 binaryPath,
                 serverUrl,
                 ...(options?.environment ? { environment: options.environment } : {}),
-                reuseLocalServer: false,
+                reuseLocalServer: true,
               });
               const client = openCodeRuntime.createOpenCodeSdkClient({
                 baseUrl: server.url,