diff --git a/src/agents/index.ts b/src/agents/index.ts
new file mode 100644
index 0000000..190320e
--- /dev/null
+++ b/src/agents/index.ts
@@ -0,0 +1,10 @@
+import type { AgentConfig } from "@opencode-ai/sdk"
+import { oracleAgent } from "./oracle"
+import { librarianAgent } from "./librarian"
+import { exploreAgent } from "./explore"
+
+export const builtinAgents: Record<string, AgentConfig> = {
+  oracle: oracleAgent,
+  librarian: librarianAgent,
+  explore: exploreAgent,
+}
diff --git a/src/index.ts b/src/index.ts
new file mode 100644
index 0000000..cfa30f8
--- /dev/null
+++ b/src/index.ts
@@ -0,0 +1,132 @@
+import type { Plugin } from "@opencode-ai/plugin";
+import { builtinAgents } from "./agents";
+import {
+  createTodoContinuationEnforcer,
+  createContextWindowMonitorHook,
+} from "./hooks";
+import { updateTerminalTitle } from "./features/terminal";
+
+const OhMyOpenCodePlugin: Plugin = async (ctx) => {
+  const todoContinuationEnforcer = createTodoContinuationEnforcer(ctx);
+  const contextWindowMonitor = createContextWindowMonitorHook(ctx);
+  updateTerminalTitle({ sessionId: "main" });
+
+  let mainSessionID: string | undefined;
+  let currentSessionID: string | undefined;
+  let currentSessionTitle: string | undefined;
+
+  return {
+    config: async (config) => {
+      if (!config) return;
+      config.agent = {
+        ...config.agent,
+        ...builtinAgents,
+      };
+    },
+
+    event: async (input) => {
+      await todoContinuationEnforcer(input);
+      await contextWindowMonitor.event(input);
+
+      const { event } = input;
+      const props = event.properties as Record<string, unknown> | undefined;
+
+      if (event.type === "session.created") {
+        const sessionInfo = props?.info as
+          | { id?: string; title?: string; parentID?: string }
+          | undefined;
+        if (!sessionInfo?.parentID) {
+          mainSessionID = sessionInfo?.id;
+          currentSessionID = sessionInfo?.id;
+          currentSessionTitle = sessionInfo?.title;
+          updateTerminalTitle({
+            sessionId: currentSessionID || "main",
+            status: "idle",
+            directory: ctx.directory,
+            sessionTitle: currentSessionTitle,
+          });
+        }
+      }
+
+      if (event.type === "session.updated") {
+        const sessionInfo = props?.info as
+          | { id?: string; title?: string; parentID?: string }
+          | undefined;
+        if (!sessionInfo?.parentID) {
+          currentSessionID = sessionInfo?.id;
+          currentSessionTitle = sessionInfo?.title;
+          updateTerminalTitle({
+            sessionId: currentSessionID || "main",
+            status: "processing",
+            directory: ctx.directory,
+            sessionTitle: currentSessionTitle,
+          });
+        }
+      }
+
+      if (event.type === "session.deleted") {
+        const sessionInfo = props?.info as { id?: string } | undefined;
+        if (sessionInfo?.id === mainSessionID) {
+          mainSessionID = undefined;
+          currentSessionID = undefined;
+          currentSessionTitle = undefined;
+          updateTerminalTitle({
+            sessionId: "main",
+            status: "idle",
+          });
+        }
+      }
+
+      if (event.type === "session.error") {
+        const sessionID = props?.sessionID as string | undefined;
+        if (sessionID && sessionID === mainSessionID) {
+          updateTerminalTitle({
+            sessionId: sessionID,
+            status: "error",
+            directory: ctx.directory,
+            sessionTitle: currentSessionTitle,
+          });
+        }
+      }
+
+      if (event.type === "session.idle") {
+        const sessionID = props?.sessionID as string | undefined;
+        if (sessionID && sessionID === mainSessionID) {
+          updateTerminalTitle({
+            sessionId: sessionID,
+            status: "idle",
+            directory: ctx.directory,
+            sessionTitle: currentSessionTitle,
+          });
+        }
+      }
+    },
+
+    "tool.execute.before": async (input, _output) => {
+      if (input.sessionID === mainSessionID) {
+        updateTerminalTitle({
+          sessionId: input.sessionID,
+          status: "tool",
+          currentTool: input.tool,
+          directory: ctx.directory,
+          sessionTitle: currentSessionTitle,
+        });
+      }
+    },
+
+    "tool.execute.after": async (input, output) => {
+      await contextWindowMonitor["tool.execute.after"](input, output);
+
+      if (input.sessionID === mainSessionID) {
+        updateTerminalTitle({
+          sessionId: input.sessionID,
+          status: "idle",
+          directory: ctx.directory,
+          sessionTitle: currentSessionTitle,
+        });
+      }
+    },
+  };
+};
+
+export default OhMyOpenCodePlugin;