diff --git a/apps/server/src/provider/Layers/OpenCodeAdapter.test.ts b/apps/server/src/provider/Layers/OpenCodeAdapter.test.ts
index 9823a6870..9437c791a 100644
--- a/apps/server/src/provider/Layers/OpenCodeAdapter.test.ts
+++ b/apps/server/src/provider/Layers/OpenCodeAdapter.test.ts
@@ -5021,4 +5021,254 @@ it.layer(OpenCodeAdapterTestLayer)("OpenCodeAdapterLive", (it) => {
       NodeAssert.deepEqual(closeCallsDuringRun, []);
     }),
   );
+
+  it.effect("maps OpenCode todo updates onto a turn plan", () =>
+    Effect.gen(function* () {
+      const adapter = yield* OpenCodeAdapter;
+      const threadId = asThreadId("thread-todo-plan");
+      const todoEvent = promiseWithResolvers<unknown>();
+      runtimeMock.state.autoPromptEcho = false;
+      runtimeMock.state.subscribedEvents = [todoEvent.promise];
+
+      const eventsFiber = yield* adapter.streamEvents.pipe(
+        Stream.filter((event) => event.threadId === threadId && event.type === "turn.plan.updated"),
+        Stream.take(1),
+        Stream.runCollect,
+        Effect.forkChild,
+      );
+      yield* adapter.startSession({
+        provider: ProviderDriverKind.make("opencode"),
+        threadId,
+        runtimeMode: "full-access",
+      });
+      const turn = yield* adapter.sendTurn({
+        threadId,
+        input: "Plan the work",
+        modelSelection: createModelSelection(
+          ProviderInstanceId.make("opencode"),
+          "opencode/kimi-k3",
+        ),
+      });
+
+      todoEvent.resolve({
+        id: "evt-todo-plan",
+        type: "todo.updated",
+        properties: {
+          sessionID: "http://127.0.0.1:9999/session",
+          todos: [
+            { id: "t1", content: "Read the adapter", status: "completed", priority: "high" },
+            { id: "t2", content: "Emit the plan", status: "in_progress", priority: "medium" },
+            { id: "t3", content: "Write tests", status: "pending", priority: "low" },
+          ],
+        },
+      });
+
+      const events = Array.from(yield* Fiber.join(eventsFiber).pipe(Effect.timeout("1 second")));
+      const planEvent = events[0];
+      NodeAssert.equal(planEvent?.type, "turn.plan.updated");
+      NodeAssert.equal(planEvent?.turnId, turn.turnId);
+      if (planEvent?.type === "turn.plan.updated") {
+        NodeAssert.deepEqual(planEvent.payload.plan, [
+          { step: "Read the adapter", status: "completed" },
+          { step: "Emit the plan", status: "inProgress" },
+          { step: "Write tests", status: "pending" },
+        ]);
+      }
+
+      yield* adapter.stopSession(threadId);
+    }),
+  );
+
+  it.effect("drops cancelled todos and names an empty step", () =>
+    Effect.gen(function* () {
+      const adapter = yield* OpenCodeAdapter;
+      const threadId = asThreadId("thread-todo-cancelled");
+      const todoEvent = promiseWithResolvers<unknown>();
+      runtimeMock.state.autoPromptEcho = false;
+      runtimeMock.state.subscribedEvents = [todoEvent.promise];
+
+      const eventsFiber = yield* adapter.streamEvents.pipe(
+        Stream.filter((event) => event.threadId === threadId && event.type === "turn.plan.updated"),
+        Stream.take(1),
+        Stream.runCollect,
+        Effect.forkChild,
+      );
+      yield* adapter.startSession({
+        provider: ProviderDriverKind.make("opencode"),
+        threadId,
+        runtimeMode: "full-access",
+      });
+      yield* adapter.sendTurn({
+        threadId,
+        input: "Plan with a cancelled item",
+        modelSelection: createModelSelection(
+          ProviderInstanceId.make("opencode"),
+          "opencode/kimi-k3",
+        ),
+      });
+
+      todoEvent.resolve({
+        id: "evt-todo-cancelled",
+        type: "todo.updated",
+        properties: {
+          sessionID: "http://127.0.0.1:9999/session",
+          todos: [
+            { id: "t1", content: "   ", status: "pending", priority: "high" },
+            { id: "t2", content: "Abandoned branch", status: "cancelled", priority: "low" },
+            { id: "t3", content: "Still going", status: "unrecognized-status", priority: "low" },
+          ],
+        },
+      });
+
+      const events = Array.from(yield* Fiber.join(eventsFiber).pipe(Effect.timeout("1 second")));
+      const planEvent = events[0];
+      if (planEvent?.type === "turn.plan.updated") {
+        // Cancelled work is dropped rather than reported completed, an empty
+        // description gets a placeholder, and an unknown status stays pending.
+        NodeAssert.deepEqual(planEvent.payload.plan, [
+          { step: "Task", status: "pending" },
+          { step: "Still going", status: "pending" },
+        ]);
+      }
+
+      yield* adapter.stopSession(threadId);
+    }),
+  );
+
+  it.effect("emits one plan update when OpenCode repeats a todo payload", () =>
+    Effect.gen(function* () {
+      const adapter = yield* OpenCodeAdapter;
+      const threadId = asThreadId("thread-todo-dedupe");
+      const firstTodo = promiseWithResolvers<unknown>();
+      const repeatTodo = promiseWithResolvers<unknown>();
+      const changedTodo = promiseWithResolvers<unknown>();
+      runtimeMock.state.autoPromptEcho = false;
+      runtimeMock.state.subscribedEvents = [
+        firstTodo.promise,
+        repeatTodo.promise,
+        changedTodo.promise,
+      ];
+
+      const eventsFiber = yield* adapter.streamEvents.pipe(
+        Stream.filter((event) => event.threadId === threadId && event.type === "turn.plan.updated"),
+        Stream.take(2),
+        Stream.runCollect,
+        Effect.forkChild,
+      );
+      yield* adapter.startSession({
+        provider: ProviderDriverKind.make("opencode"),
+        threadId,
+        runtimeMode: "full-access",
+      });
+      yield* adapter.sendTurn({
+        threadId,
+        input: "Repeat the plan",
+        modelSelection: createModelSelection(
+          ProviderInstanceId.make("opencode"),
+          "opencode/kimi-k3",
+        ),
+      });
+
+      const todos = [{ id: "t1", content: "Only step", status: "pending", priority: "high" }];
+      firstTodo.resolve({
+        id: "evt-todo-first",
+        type: "todo.updated",
+        properties: { sessionID: "http://127.0.0.1:9999/session", todos },
+      });
+      yield* Effect.yieldNow;
+      repeatTodo.resolve({
+        id: "evt-todo-repeat",
+        type: "todo.updated",
+        properties: { sessionID: "http://127.0.0.1:9999/session", todos },
+      });
+      yield* Effect.yieldNow;
+      changedTodo.resolve({
+        id: "evt-todo-changed",
+        type: "todo.updated",
+        properties: {
+          sessionID: "http://127.0.0.1:9999/session",
+          todos: [{ id: "t1", content: "Only step", status: "completed", priority: "high" }],
+        },
+      });
+
+      // Take(2) only completes if the identical repeat was suppressed and the
+      // genuine status change was not.
+      const events = Array.from(yield* Fiber.join(eventsFiber).pipe(Effect.timeout("1 second")));
+      NodeAssert.equal(events.length, 2);
+      const second = events[1];
+      if (second?.type === "turn.plan.updated") {
+        NodeAssert.deepEqual(second.payload.plan, [{ step: "Only step", status: "completed" }]);
+      }
+
+      yield* adapter.stopSession(threadId);
+    }),
+  );
+
+  it.effect("classifies todowrite as a tool call rather than a file change", () =>
+    Effect.gen(function* () {
+      const adapter = yield* OpenCodeAdapter;
+      const threadId = asThreadId("thread-todo-classification");
+      const assistantMessage = promiseWithResolvers<unknown>();
+      const toolPart = promiseWithResolvers<unknown>();
+      runtimeMock.state.autoPromptEcho = false;
+      runtimeMock.state.subscribedEvents = [assistantMessage.promise, toolPart.promise];
+
+      const eventsFiber = yield* adapter.streamEvents.pipe(
+        Stream.filter((event) => event.threadId === threadId && event.type === "item.completed"),
+        Stream.take(1),
+        Stream.runCollect,
+        Effect.forkChild,
+      );
+      yield* adapter.startSession({
+        provider: ProviderDriverKind.make("opencode"),
+        threadId,
+        runtimeMode: "full-access",
+      });
+      yield* adapter.sendTurn({
+        threadId,
+        input: "Track the work",
+        modelSelection: createModelSelection(
+          ProviderInstanceId.make("opencode"),
+          "opencode/kimi-k3",
+        ),
+      });
+
+      assistantMessage.resolve({
+        id: "evt-assistant-todo-tool",
+        type: "message.updated",
+        properties: {
+          sessionID: "http://127.0.0.1:9999/session",
+          info: { id: "msg-todo-tool", role: "assistant" },
+        },
+      });
+      yield* Effect.yieldNow;
+      toolPart.resolve({
+        id: "evt-todo-tool-part",
+        type: "message.part.updated",
+        properties: {
+          sessionID: "http://127.0.0.1:9999/session",
+          part: {
+            id: "part-todo-tool",
+            sessionID: "http://127.0.0.1:9999/session",
+            messageID: "msg-todo-tool",
+            callID: "call-todo-tool",
+            type: "tool",
+            tool: "todowrite",
+            state: { status: "completed", title: "todowrite", time: { start: 1, end: 2 } },
+          },
+          time: 1,
+        },
+      });
+
+      const events = Array.from(yield* Fiber.join(eventsFiber).pipe(Effect.timeout("1 second")));
+      const item = events[0];
+      if (item?.type === "item.completed") {
+        // "todowrite" contains "write" but edits nothing; filing it as
+        // file_change inflates the work log's edit count.
+        NodeAssert.equal(item.payload.itemType, "dynamic_tool_call");
+      }
+
+      yield* adapter.stopSession(threadId);
+    }),
+  );
 });
diff --git a/apps/server/src/provider/Layers/OpenCodeAdapter.ts b/apps/server/src/provider/Layers/OpenCodeAdapter.ts
index 0d67224d9..6b9e29490 100644
--- a/apps/server/src/provider/Layers/OpenCodeAdapter.ts
+++ b/apps/server/src/provider/Layers/OpenCodeAdapter.ts
@@ -338,6 +338,12 @@ interface OpenCodeSessionContext {
   activeTurnId: TurnId | undefined;
   activeAgent: string | undefined;
   activeVariant: string | undefined;
+  /**
+   * Last emitted plan fingerprint. OpenCode re-emits `todo.updated` on every
+   * mutation, so without this each step transition writes a duplicate plan
+   * activity.
+   */
+  lastPlanFingerprint: string | undefined;
   cancellation: OpenCodeCancellation | undefined;
   interruptedTurnId: TurnId | undefined;
   reconcileIdleStatus: boolean;
@@ -411,11 +417,44 @@ type EventBaseInput = {
   readonly raw?: unknown;
 };
 
+type OpenCodePlanStep = {
+  readonly step: string;
+  readonly status: "pending" | "inProgress" | "completed";
+};
+
+/**
+ * Maps an OpenCode `todo.updated` payload onto Pylon plan steps. `Todo.status`
+ * is typed as a bare string by the SDK, so anything unrecognized settles to
+ * `pending` rather than inventing progress. Cancelled entries are dropped
+ * outright: reporting them as `completed` would claim work that never happened,
+ * and Pylon's plan contract has no cancelled state to carry them into.
+ */
+function extractOpenCodePlanSteps(todos: ReadonlyArray<unknown>): OpenCodePlanStep[] {
+  return todos
+    .filter((todo): todo is Record<string, unknown> => todo !== null && typeof todo === "object")
+    .filter((todo) => todo.status !== "cancelled")
+    .map((todo) => ({
+      step: trimText(typeof todo.content === "string" ? todo.content : undefined) ?? "Task",
+      status:
+        todo.status === "completed"
+          ? ("completed" as const)
+          : todo.status === "in_progress"
+            ? ("inProgress" as const)
+            : ("pending" as const),
+    }));
+}
+
 function toToolLifecycleItemType(toolName: string): ToolLifecycleItemType {
   const normalized = toolName.toLowerCase();
   if (normalized.includes("bash") || normalized.includes("command")) {
     return "command_execution";
   }
+  // Ahead of the write/edit branch: `todowrite` contains "write" but changes no
+  // file, and classifying it as `file_change` files it into the edit tool group
+  // and inflates the work log's edit count.
+  if (normalized.includes("todo")) {
+    return "dynamic_tool_call";
+  }
   if (
     normalized.includes("edit") ||
     normalized.includes("write") ||
@@ -2090,6 +2129,37 @@ export function makeOpenCodeAdapter(
           break;
         }
 
+        case "todo.updated": {
+          // Only the parent session owns the thread's plan; a delegated child
+          // session's todos would otherwise overwrite it.
+          if (!isParentEvent) {
+            break;
+          }
+          const plan = extractOpenCodePlanSteps(event.properties.todos);
+          if (plan.length === 0) {
+            break;
+          }
+          // Control-character delimiters keep this deterministic without JSON;
+          // todo text realistically never contains them.
+          const fingerprint = `${turnId ?? "no-turn"}:${plan
+            .map((entry) => `${entry.status}\u0000${entry.step}`)
+            .join("\u0001")}`;
+          if (context.lastPlanFingerprint === fingerprint) {
+            break;
+          }
+          context.lastPlanFingerprint = fingerprint;
+          yield* emit({
+            ...(yield* buildEventBase({
+              threadId: context.session.threadId,
+              ...(turnId ? { turnId } : {}),
+              raw: event,
+            })),
+            type: "turn.plan.updated",
+            payload: { plan },
+          });
+          break;
+        }
+
         case "session.status": {
           if (event.properties.status.type === "busy") {
             if (turnId === undefined) {
@@ -2477,6 +2547,7 @@ export function makeOpenCodeAdapter(
           cancellation: undefined,
           interruptedTurnId: undefined,
           reconcileIdleStatus: false,
+          lastPlanFingerprint: undefined,
           awaitingBusyAfterInterruption: false,
           pendingIdleReconciliation: undefined,
           pendingRequestRecovery: undefined,
diff --git a/docs/user/providers-opencode.md b/docs/user/providers-opencode.md
index f3d9b5dc9..d487da0be 100644
--- a/docs/user/providers-opencode.md
+++ b/docs/user/providers-opencode.md
@@ -17,6 +17,12 @@ With a server URL, Pylon connects to that external server and uses only the pass
 provider settings. It does not send a local `OPENCODE_SERVER_PASSWORD` to an external server.
 OpenCode uses this password for HTTP Basic authentication.
 
+## Task progress
+
+When OpenCode keeps a todo list for a piece of work, its steps appear in the composer's Tasks tab,
+in the plan summary on the turn, and on the sidebar's working line, and they update as the agent
+moves through them. Steps OpenCode cancels drop off the list rather than showing as finished.
+
 ## Refresh the model list
 
 Pylon loads the model list when an enabled OpenCode provider starts and keeps the list in its