diff --git a/README.md b/README.md
index edadad5..4dda01e 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,8 @@
 
 <p align="center">
   <a href="https://pypi.org/project/vectry-agentlens/"><img src="https://img.shields.io/pypi/v/vectry-agentlens?color=blue" alt="PyPI"></a>
+  <a href="https://www.npmjs.com/package/agentlens-sdk"><img src="https://img.shields.io/npm/v/agentlens-sdk?color=blue" alt="npm"></a>
+  <a href="https://www.npmjs.com/package/opencode-agentlens"><img src="https://img.shields.io/npm/v/opencode-agentlens?color=blue&label=opencode-plugin" alt="OpenCode Plugin"></a>
   <a href="https://gitea.repi.fun/repi/agentlens/src/branch/main/LICENSE"><img src="https://img.shields.io/badge/license-MIT-green" alt="License"></a>
   <a href="https://agentlens.vectry.tech"><img src="https://img.shields.io/badge/demo-live-brightgreen" alt="Demo"></a>
 </p>
@@ -44,6 +46,8 @@ Open `https://agentlens.vectry.tech/dashboard` to see your traces.
 ## Features
 
 - **Decision Tracing** -- Log every decision point with reasoning, alternatives, and confidence scores
+- **OpenCode Plugin** -- Trace your coding agent sessions with `opencode-agentlens`
+- **TypeScript SDK** -- First-class TypeScript support with `agentlens-sdk`
 - **OpenAI Integration** -- Auto-instrument OpenAI calls with one line: `wrap_openai(client)`
 - **LangChain Integration** -- Drop-in callback handler for LangChain agents
 - **Nested Traces** -- Multi-agent workflows with parent-child span relationships
@@ -52,13 +56,62 @@ Open `https://agentlens.vectry.tech/dashboard` to see your traces.
 - **Analytics** -- Token usage, cost tracking, duration timelines per trace
 - **Self-Hostable** -- Docker Compose deployment, bring your own Postgres + Redis
 
+## OpenCode Plugin
+
+Trace your [OpenCode](https://opencode.ai) coding agent sessions automatically.
+
+```bash
+npm install -g opencode-agentlens
+```
+
+Add to your `opencode.json`:
+
+```json
+{
+  "plugin": ["opencode-agentlens"]
+}
+```
+
+Set environment variables:
+
+```bash
+export AGENTLENS_API_KEY="your-key"
+export AGENTLENS_ENDPOINT="https://agentlens.vectry.tech"
+```
+
+Every coding session automatically captures tool calls, LLM interactions, file edits, and permission flows.
+
+## TypeScript SDK
+
+```bash
+npm install agentlens-sdk
+```
+
+```typescript
+import { init, TraceBuilder, SpanType, SpanStatus } from "agentlens-sdk";
+
+init({ apiKey: "your-key", endpoint: "https://agentlens.vectry.tech" });
+
+const trace = new TraceBuilder("my-agent-task", {
+  tags: ["production"],
+});
+
+trace.addSpan({
+  name: "tool-call",
+  type: SpanType.TOOL_CALL,
+  status: SpanStatus.COMPLETED,
+});
+
+trace.end();
+```
+
 ## Architecture
 
 ```
-SDK (Python)                 API (Next.js)              Dashboard (React)
+SDK (Python/TS)              API (Next.js)              Dashboard (React)
  agentlens.trace() ------>  POST /api/traces  ------>  Real-time SSE stream
- agentlens.log_decision()   Prisma + Postgres          Decision tree viz
- wrap_openai(client)        Redis pub/sub              Analytics & filters
+ TraceBuilder.end()          Prisma + Postgres          Decision tree viz
+ OpenCode plugin             Redis pub/sub              Analytics & filters
 ```
 
 ## Integrations
@@ -142,16 +195,20 @@ The dashboard will be available at `http://localhost:4200`.
 
 ```
 agentlens/
-  apps/web/           # Next.js 15 dashboard + API
-  packages/database/  # Prisma schema + client
-  packages/sdk-python/  # Python SDK (PyPI: vectry-agentlens)
-  examples/           # Example agent scripts
-  docker-compose.yml  # Production deployment
+  apps/web/                # Next.js 15 dashboard + API
+  packages/database/       # Prisma schema + client
+  packages/sdk-python/     # Python SDK (PyPI: vectry-agentlens)
+  packages/sdk-ts/         # TypeScript SDK (npm: agentlens-sdk)
+  packages/opencode-plugin/ # OpenCode plugin (npm: opencode-agentlens)
+  examples/                # Example agent scripts
+  docker-compose.yml       # Production deployment
 ```
 
 ## SDK Reference
 
-See the full [Python SDK documentation](packages/sdk-python/README.md).
+- [Python SDK documentation](packages/sdk-python/README.md)
+- [TypeScript SDK documentation](packages/sdk-ts/README.md)
+- [OpenCode plugin documentation](packages/opencode-plugin/README.md)
 
 ## Examples
 
diff --git a/apps/web/src/app/dashboard/layout.tsx b/apps/web/src/app/dashboard/layout.tsx
index dddfd98..50d4673 100644
--- a/apps/web/src/app/dashboard/layout.tsx
+++ b/apps/web/src/app/dashboard/layout.tsx
@@ -51,7 +51,11 @@ function Sidebar({ onNavigate }: { onNavigate?: () => void }) {
       <nav className="flex-1 p-4 space-y-1">
         {navItems.map((item) => {
           const Icon = item.icon;
-          const isActive = pathname === item.href || pathname.startsWith(`${item.href}/`);
+          const isActive =
+            item.href === "/dashboard"
+              ? pathname === "/dashboard"
+              : pathname === item.href ||
+                pathname.startsWith(`${item.href}/`);
 
           return (
             <Link
diff --git a/packages/opencode-plugin/package.json b/packages/opencode-plugin/package.json
index be37e46..dc9cd92 100644
--- a/packages/opencode-plugin/package.json
+++ b/packages/opencode-plugin/package.json
@@ -1,6 +1,6 @@
 {
   "name": "opencode-agentlens",
-  "version": "0.1.0",
+  "version": "0.1.1",
   "description": "OpenCode plugin for AgentLens — trace your coding agent's decisions, tool calls, and sessions",
   "type": "module",
   "main": "./dist/index.cjs",
diff --git a/packages/opencode-plugin/src/index.ts b/packages/opencode-plugin/src/index.ts
index d723d60..0c66f64 100644
--- a/packages/opencode-plugin/src/index.ts
+++ b/packages/opencode-plugin/src/index.ts
@@ -5,6 +5,19 @@ import { loadConfig } from "./config.js";
 import { SessionState } from "./state.js";
 import { truncate, safeJsonValue } from "./utils.js";
 
+/**
+ * OpenCode Event shapes (from @opencode-ai/sdk):
+ *
+ * session.created  → { type, properties: { info: Session } }
+ * session.idle     → { type, properties: { sessionID: string } }
+ * session.deleted  → { type, properties: { info: Session } }
+ * session.error    → { type, properties: { sessionID?: string, error?: ... } }
+ * session.diff     → { type, properties: { sessionID: string, diff: FileDiff[] } }
+ * file.edited      → { type, properties: { file: string } }
+ *
+ * Session = { id, projectID, directory, title, ... }
+ */
+
 const plugin: Plugin = async ({ project, directory, worktree }) => {
   const config = loadConfig();
 
@@ -13,6 +26,8 @@ const plugin: Plugin = async ({ project, directory, worktree }) => {
     return {};
   }
 
+  console.log(`[agentlens] Plugin enabled — endpoint: ${config.endpoint}`);
+
   init({
     apiKey: config.apiKey,
     endpoint: config.endpoint,
@@ -22,6 +37,11 @@ const plugin: Plugin = async ({ project, directory, worktree }) => {
 
   const state = new SessionState();
 
+  /** Helper: get a session ID from the active traces (fallback for events that lack one) */
+  function getAnySessionId(): string | undefined {
+    return state.getActiveSessionIds()[0];
+  }
+
   return {
     event: async ({ event }) => {
       const type = event.type;
@@ -29,66 +49,118 @@ const plugin: Plugin = async ({ project, directory, worktree }) => {
         | Record<string, unknown>
         | undefined;
 
-      if (type === "session.created" && props?.["id"]) {
-        state.startSession(String(props["id"]), {
-          project: project.id,
-          directory,
-          worktree,
-        });
+      if (type === "session.created") {
+        // props.info is a Session object with { id, projectID, ... }
+        const info = props?.["info"] as
+          | Record<string, unknown>
+          | undefined;
+        const sessionId = info?.["id"] as string | undefined;
+        if (sessionId) {
+          state.startSession(sessionId, {
+            project: project.id,
+            directory,
+            worktree,
+            title: info?.["title"] as string | undefined,
+          });
+          console.log(`[agentlens] Session started: ${sessionId}`);
+        }
       }
 
       if (type === "session.idle") {
-        const sessionId = props?.["sessionID"] ?? props?.["id"];
-        if (sessionId) await flush();
+        // props.sessionID is the session ID string
+        const sessionId =
+          (props?.["sessionID"] as string) || getAnySessionId();
+        if (sessionId) {
+          // Flush intermediate trace so data isn't lost if session ends abruptly
+          state.flushSession(sessionId);
+          await flush();
+        }
       }
 
       if (type === "session.error") {
-        const sessionId = String(props?.["sessionID"] ?? props?.["id"] ?? "");
+        const sessionId =
+          (props?.["sessionID"] as string) || getAnySessionId() || "";
         if (sessionId) {
           const trace = state.getTrace(sessionId);
           if (trace) {
+            const error = props?.["error"] as
+              | Record<string, unknown>
+              | undefined;
             trace.addEvent({
               type: EventTypeValues.ERROR,
-              name: String(props?.["error"] ?? "session error"),
-              metadata: safeJsonValue(props) as JsonValue,
+              name: String(
+                error?.["name"] ?? error?.["message"] ?? "session error",
+              ),
+              metadata: safeJsonValue(error ?? props) as JsonValue,
             });
           }
         }
       }
 
       if (type === "session.deleted") {
-        const sessionId = String(props?.["sessionID"] ?? props?.["id"] ?? "");
-        if (sessionId) state.endSession(sessionId);
+        // props.info is a Session object with { id, ... }
+        const info = props?.["info"] as
+          | Record<string, unknown>
+          | undefined;
+        const sessionId =
+          (info?.["id"] as string) || getAnySessionId() || "";
+        if (sessionId) {
+          state.endSession(sessionId);
+          await flush();
+          console.log(`[agentlens] Session ended and flushed: ${sessionId}`);
+        }
       }
 
       if (type === "session.diff") {
-        const sessionId = String(props?.["sessionID"] ?? props?.["id"] ?? "");
+        // props.sessionID + props.diff (FileDiff[])
+        const sessionId =
+          (props?.["sessionID"] as string) || getAnySessionId() || "";
         if (sessionId) {
           const trace = state.getTrace(sessionId);
           if (trace) {
-            trace.setMetadata({
-              diff: truncate(String(props?.["diff"] ?? ""), 5000),
-            });
+            const diffs = props?.["diff"];
+            trace.setMetadata(
+              safeJsonValue({
+                diff: Array.isArray(diffs)
+                  ? diffs.map((d: Record<string, unknown>) => ({
+                      path: d?.["path"],
+                      additions: d?.["additions"],
+                      deletions: d?.["deletions"],
+                    }))
+                  : diffs,
+              }) as JsonValue,
+            );
           }
         }
       }
 
       if (type === "file.edited") {
-        const sessionId = String(props?.["sessionID"] ?? props?.["id"] ?? "");
+        // props.file is a string (file path), no sessionID on this event
+        const file = props?.["file"] as string | undefined;
+        const sessionId = getAnySessionId();
         const trace = sessionId ? state.getTrace(sessionId) : undefined;
-        if (trace) {
+        if (trace && file) {
           trace.addEvent({
             type: EventTypeValues.CUSTOM,
             name: "file.edited",
-            metadata: safeJsonValue({
-              filePath: props?.["filePath"],
-            }) as JsonValue,
+            metadata: safeJsonValue({ filePath: file }) as JsonValue,
           });
         }
       }
     },
 
     "tool.execute.before": async (input, output) => {
+      // Auto-create session if we missed session.created event
+      if (!state.getTrace(input.sessionID)) {
+        state.startSession(input.sessionID, {
+          project: project.id,
+          directory,
+          worktree,
+        });
+        console.log(
+          `[agentlens] Auto-created session from tool call: ${input.sessionID}`,
+        );
+      }
       state.startToolCall(
         input.callID,
         input.tool,
@@ -107,6 +179,17 @@ const plugin: Plugin = async ({ project, directory, worktree }) => {
     },
 
     "chat.message": async (input) => {
+      // Auto-create session if we missed session.created event
+      if (!state.getTrace(input.sessionID)) {
+        state.startSession(input.sessionID, {
+          project: project.id,
+          directory,
+          worktree,
+        });
+        console.log(
+          `[agentlens] Auto-created session from chat.message: ${input.sessionID}`,
+        );
+      }
       if (input.model) {
         state.recordLLMCall(input.sessionID, {
           model: input.model,
diff --git a/packages/opencode-plugin/src/state.ts b/packages/opencode-plugin/src/state.ts
index 5040248..cc0666a 100644
--- a/packages/opencode-plugin/src/state.ts
+++ b/packages/opencode-plugin/src/state.ts
@@ -4,6 +4,7 @@ import {
   SpanStatus,
   DecisionType,
   nowISO,
+  getClient,
 } from "agentlens-sdk";
 import type { JsonValue, TraceStatus } from "agentlens-sdk";
 import { extractToolMetadata, safeJsonValue } from "./utils.js";
@@ -180,4 +181,22 @@ export class SessionState {
   getRootSpanId(sessionId: string): string | undefined {
     return this.rootSpans.get(sessionId);
   }
+
+  getActiveSessionIds(): string[] {
+    return Array.from(this.traces.keys());
+  }
+
+  /**
+   * Send the current trace state without ending the session.
+   * This creates a snapshot so data isn't lost if the process exits unexpectedly.
+   */
+  flushSession(sessionId: string): void {
+    const trace = this.traces.get(sessionId);
+    if (!trace) return;
+
+    const transport = getClient();
+    if (transport) {
+      transport.add(trace.toPayload());
+    }
+  }
 }