diff --git a/client/package.json b/client/package.json
index 7a08018..b533384 100644
--- a/client/package.json
+++ b/client/package.json
@@ -29,7 +29,8 @@
   "scripts": {
     "start": "react-scripts start",
     "build": "cross-env CI=false react-scripts build",
-    "electron": "electron ."
+    "electron": "electron .",
+    "test": "react-scripts test"
   },
   "eslintConfig": {
     "extends": [
diff --git a/client/src/__tests__/workflowTimelineFilters.test.jsx b/client/src/__tests__/workflowTimelineFilters.test.jsx
new file mode 100644
index 0000000..0a9aa55
--- /dev/null
+++ b/client/src/__tests__/workflowTimelineFilters.test.jsx
@@ -0,0 +1,56 @@
+import React from "react";
+import "@testing-library/jest-dom";
+import { render, screen } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import WorkflowTimeline from "../components/workflow/WorkflowTimeline";
+
+const events = [
+  { id: "1", actor: "user", type: "prompt.submitted", message: "Ask" },
+  { id: "2", actor: "agent", type: "tool.called", message: "Search" },
+  { id: "3", actor: "system", type: "workflow.started", message: "Init" },
+  { id: "4", actor: "agent", type: "tool.result", message: "Done" },
+];
+
+const getTimelineText = () => screen.getByLabelText("Workflow timeline").textContent;
+
+const expectVisibleEvents = (visibleMessages) => {
+  const text = getTimelineText();
+  events.forEach((event) => {
+    if (visibleMessages.includes(event.message)) {
+      expect(text).toContain(event.message);
+    } else {
+      expect(text).not.toContain(event.message);
+    }
+  });
+};
+
+describe("workflow timeline filters", () => {
+  it("shows full timeline by default", () => {
+    render(<WorkflowTimeline events={events} />);
+
+    expectVisibleEvents(["Ask", "Search", "Init", "Done"]);
+  });
+
+  it("filters by actor and event type, then can clear filters", async () => {
+    const user = userEvent.setup();
+    render(<WorkflowTimeline events={events} />);
+
+    await user.selectOptions(screen.getByLabelText("Actor filter"), "agent");
+    expectVisibleEvents(["Search", "Done"]);
+
+    await user.type(screen.getByLabelText("Event type filter"), "result");
+    expectVisibleEvents(["Done"]);
+
+    await user.click(screen.getByRole("button", { name: /clear filters/i }));
+    expectVisibleEvents(["Ask", "Search", "Init", "Done"]);
+  });
+
+  it("supports event type filter independently of actor", async () => {
+    const user = userEvent.setup();
+    render(<WorkflowTimeline events={events} />);
+
+    await user.type(screen.getByLabelText("Event type filter"), "tool");
+
+    expectVisibleEvents(["Search", "Done"]);
+  });
+});
diff --git a/client/src/components/workflow/WorkflowTimeline.js b/client/src/components/workflow/WorkflowTimeline.js
new file mode 100644
index 0000000..9af7e9a
--- /dev/null
+++ b/client/src/components/workflow/WorkflowTimeline.js
@@ -0,0 +1,33 @@
+import React from "react";
+import {
+  WorkflowTimelineProvider,
+  useWorkflowTimeline,
+} from "../../contexts/workflow/WorkflowTimelineContext";
+import WorkflowTimelineFilters from "./WorkflowTimelineFilters";
+
+function TimelineEventList() {
+  const { filteredEvents } = useWorkflowTimeline();
+
+  return (
+    <ul aria-label="Workflow timeline" style={{ margin: 0, paddingLeft: 20 }}>
+      {filteredEvents.map((event) => (
+        <li key={event.id}>
+          <strong>{event.type}</strong> · {event.actor} · {event.message}
+        </li>
+      ))}
+    </ul>
+  );
+}
+
+function WorkflowTimeline({ events }) {
+  return (
+    <WorkflowTimelineProvider events={events}>
+      <div style={{ display: "grid", gap: 12 }}>
+        <WorkflowTimelineFilters />
+        <TimelineEventList />
+      </div>
+    </WorkflowTimelineProvider>
+  );
+}
+
+export default WorkflowTimeline;
diff --git a/client/src/components/workflow/WorkflowTimelineFilters.js b/client/src/components/workflow/WorkflowTimelineFilters.js
new file mode 100644
index 0000000..c8f63be
--- /dev/null
+++ b/client/src/components/workflow/WorkflowTimelineFilters.js
@@ -0,0 +1,44 @@
+import React from "react";
+import { useWorkflowTimeline } from "../../contexts/workflow/WorkflowTimelineContext";
+
+function WorkflowTimelineFilters() {
+  const {
+    actorFilter,
+    setActorFilter,
+    eventTypeFilter,
+    setEventTypeFilter,
+    clearFilters,
+  } = useWorkflowTimeline();
+
+  return (
+    <div style={{ display: "flex", gap: 12, flexWrap: "wrap" }}>
+      <label>
+        Actor filter
+        <select
+          aria-label="Actor filter"
+          value={actorFilter}
+          onChange={(event) => setActorFilter(event.target.value)}
+        >
+          <option value="all">All actors</option>
+          <option value="user">User</option>
+          <option value="agent">Agent</option>
+          <option value="system">System</option>
+        </select>
+      </label>
+      <label>
+        Event type filter
+        <input
+          aria-label="Event type filter"
+          placeholder="Filter event type"
+          value={eventTypeFilter}
+          onChange={(event) => setEventTypeFilter(event.target.value)}
+        />
+      </label>
+      <button type="button" onClick={clearFilters}>
+        Clear filters
+      </button>
+    </div>
+  );
+}
+
+export default WorkflowTimelineFilters;
diff --git a/client/src/contexts/workflow/WorkflowTimelineContext.js b/client/src/contexts/workflow/WorkflowTimelineContext.js
new file mode 100644
index 0000000..19c8f41
--- /dev/null
+++ b/client/src/contexts/workflow/WorkflowTimelineContext.js
@@ -0,0 +1,72 @@
+import React, { createContext, useContext, useMemo, useState } from "react";
+
+const ACTOR_ALL = "all";
+
+const WorkflowTimelineContext = createContext(null);
+
+const normalize = (value) => String(value || "").trim().toLowerCase();
+
+export function WorkflowTimelineProvider({ events, children }) {
+  const [actorFilter, setActorFilter] = useState(ACTOR_ALL);
+  const [eventTypeFilter, setEventTypeFilter] = useState("");
+
+  const normalizedEventTypeFilter = useMemo(
+    () => normalize(eventTypeFilter),
+    [eventTypeFilter],
+  );
+
+  const filteredEvents = useMemo(() => {
+    const hasActorFilter = actorFilter !== ACTOR_ALL;
+    const hasEventTypeFilter = Boolean(normalizedEventTypeFilter);
+
+    if (!hasActorFilter && !hasEventTypeFilter) {
+      return events;
+    }
+
+    return events.filter((event) => {
+      if (hasActorFilter && event.actor !== actorFilter) {
+        return false;
+      }
+
+      if (!hasEventTypeFilter) {
+        return true;
+      }
+
+      return normalize(event.type).includes(normalizedEventTypeFilter);
+    });
+  }, [actorFilter, events, normalizedEventTypeFilter]);
+
+  const clearFilters = () => {
+    setActorFilter(ACTOR_ALL);
+    setEventTypeFilter("");
+  };
+
+  const value = useMemo(
+    () => ({
+      actorFilter,
+      setActorFilter,
+      eventTypeFilter,
+      setEventTypeFilter,
+      filteredEvents,
+      clearFilters,
+    }),
+    [actorFilter, eventTypeFilter, filteredEvents],
+  );
+
+  return (
+    <WorkflowTimelineContext.Provider value={value}>
+      {children}
+    </WorkflowTimelineContext.Provider>
+  );
+}
+
+export function useWorkflowTimeline() {
+  const context = useContext(WorkflowTimelineContext);
+  if (!context) {
+    throw new Error(
+      "useWorkflowTimeline must be used inside WorkflowTimelineProvider",
+    );
+  }
+
+  return context;
+}