diff --git a/packages/dsh-plugin-browserskill/README.md b/packages/dsh-plugin-browserskill/README.md
index 83b3a6a..e02453a 100644
--- a/packages/dsh-plugin-browserskill/README.md
+++ b/packages/dsh-plugin-browserskill/README.md
@@ -54,7 +54,7 @@ the `bsk` CLI and browser extension separately when a release requires it.
 | `browser_session` | `start`, `stop`, `list` | Manage plugin-owned Agent Window sessions. |
 | `browser_page` | `navigate`, `back`, `forward`, `reload`, `wait` | Navigate the active tab and wait for page lifecycle events. |
 | `browser_inspect` | `observe`, `snapshot`, `html`, `screenshot`, `console`, `network` | Read semantic or diagnostic page state and capture screenshots. |
-| `browser_interact` | `click`, `hover`, `fill`, `select`, `press` | Interact with controls using fresh refs or selectors. |
+| `browser_interact` | `click`, `hover`, `focus`, `blur`, `fill`, `select`, `press` | Interact with controls using fresh refs or selectors. |
 | `browser_tabs` | `list`, `create`, `select`, `close`, `borrow`, `return` | Manage Agent Window tabs and temporarily borrow user tabs. |
 | `browser_assist` | `resize`, `emulate`, `request-help` | Resize or emulate the browser and pause for human-only steps. |
 
diff --git a/packages/dsh-plugin-browserskill/skill/SKILL.md b/packages/dsh-plugin-browserskill/skill/SKILL.md
index 464a24e..6ca293a 100644
--- a/packages/dsh-plugin-browserskill/skill/SKILL.md
+++ b/packages/dsh-plugin-browserskill/skill/SKILL.md
@@ -51,8 +51,8 @@ Use `browser_inspect` action `observe` as the primary semantic page view. It ret
 text, and `@eN` refs. Prefer fresh refs over raw selectors. Refs invalidate after navigation and may
 also become stale after large DOM changes, so observe again before the next interaction.
 
-Use `browser_interact` for click, hover, fill, select, and key actions. An observation marks a
-hover-only surface as `@e1 button "Products" [hover first: Shoes | Bags]`. The listed items are
+Use `browser_interact` for click, hover, focus, blur, fill, select, and key actions. Focus and blur
+explicitly enter or leave UI states triggered by focus changes. An observation marks a hover-only surface as `@e1 button "Products" [hover first: Shoes | Bags]`. The listed items are
 labels, not usable refs: hover the trigger, observe again, then act on the revealed item's own ref.
 Do not click the trigger itself unless the user wants the trigger's action.
 
diff --git a/packages/dsh-plugin-browserskill/src/browser-tools.ts b/packages/dsh-plugin-browserskill/src/browser-tools.ts
index b69a83d..3204eed 100644
--- a/packages/dsh-plugin-browserskill/src/browser-tools.ts
+++ b/packages/dsh-plugin-browserskill/src/browser-tools.ts
@@ -167,12 +167,14 @@ const BROWSER_TOOL_SPECS: BrowserToolSpec[] = [
   {
     name: "browser_interact",
     description:
-      "Interact with an element in the active Agent Window tab. Actions: click, hover, fill, select, " +
-      "press. click/hover/fill/select require target; fill also requires value; select requires " +
+      "Interact with an element in the active Agent Window tab. Actions: click, hover, focus, blur, fill, select, " +
+      "press. click/hover/focus/blur/fill/select require target; fill also requires value; select requires " +
       "values; press requires key and may optionally focus target first.",
     actions: {
       click: "interact.click",
       hover: "interact.hover",
+      focus: "interact.focus",
+      blur: "interact.blur",
       fill: "interact.fill",
       select: "interact.select",
       press: "interact.press",
diff --git a/packages/dsh-plugin-browserskill/src/observation.ts b/packages/dsh-plugin-browserskill/src/observation.ts
index efdd9c1..31f13c3 100644
--- a/packages/dsh-plugin-browserskill/src/observation.ts
+++ b/packages/dsh-plugin-browserskill/src/observation.ts
@@ -562,6 +562,10 @@ export function actionForLabel(label: string): string {
       return "clicking";
     case "hover":
       return "hovering";
+    case "focus":
+      return "focusing";
+    case "blur":
+      return "blurring";
     case "fill":
       return "filling";
     case "select":
diff --git a/packages/dsh-plugin-browserskill/src/phase-one-tools-interaction.ts b/packages/dsh-plugin-browserskill/src/phase-one-tools-interaction.ts
index 3c7c4f9..858fcc2 100644
--- a/packages/dsh-plugin-browserskill/src/phase-one-tools-interaction.ts
+++ b/packages/dsh-plugin-browserskill/src/phase-one-tools-interaction.ts
@@ -13,7 +13,7 @@ import type { ToolDeps } from "./tools";
 
 const MODIFIERS = ["alt", "ctrl", "meta", "shift"] as const;
 
-/** Add hover and select without bypassing session ownership or observation. */
+/** Add hover, focus, blur and select without bypassing session ownership or observation. */
 export function registerPhaseOneInteractionTools(
   deps: ToolDeps,
   register: ToolRegistrar,
@@ -100,6 +100,88 @@ export function registerPhaseOneInteractionTools(
     }),
   );
 
+  for (const action of ["focus", "blur"] as const) {
+    register(
+      defineTool({
+        name: `interact.${action}`,
+        description:
+          action === "focus"
+            ? "Focus an element and verify its DOM focus state."
+            : "Remove focus from an element and report whether it was focused.",
+        parameters: {
+          target: {
+            type: "string",
+            required: true,
+            description: "Snapshot ref (@e3 / e3) or CSS selector of the element.",
+          },
+          session: SESSION_PARAM,
+          tabId: TAB_ID_PARAM,
+          timeoutMs: TIMEOUT_MS_PARAM,
+        },
+        output: {
+          schema: {
+            type: "object",
+            additionalProperties: false,
+            properties: {
+              session: { type: "string", required: true },
+              tabId: { type: "integer", required: true },
+              focused: { type: "boolean", required: true },
+              wasFocused: {
+                type: "boolean",
+                description: "Whether the target was focused before blur.",
+              },
+            },
+          },
+          render: (_args, value) => [
+            {
+              type: "text",
+              text:
+                `[session ${value.session}] ${action} on tab ${value.tabId}: focused=${value.focused}` +
+                (value.wasFocused === undefined ? "" : `, wasFocused=${value.wasFocused}`),
+            },
+          ],
+        },
+        async execute(args, exec) {
+          requireNonEmpty(args.target, "target");
+          requirePositive(args.timeoutMs, "timeoutMs");
+          const sessionId = registry.resolve(args.session, `browser_interact(action=${action})`);
+          const cmdArgs = [action, "--session", sessionId];
+          appendTabId(cmdArgs, args.tabId);
+          if (args.timeoutMs !== undefined) cmdArgs.push("--timeout", `${args.timeoutMs}ms`);
+          appendTarget(cmdArgs, args.target);
+          const reply = (await runtime.run(
+            exec,
+            cmdArgs,
+            action,
+            sessionId,
+            runnerTimeout(deps, args.timeoutMs),
+          )) as {
+            tab_id: number;
+            focused: boolean;
+            was_focused?: boolean;
+          };
+          return {
+            session: sessionId,
+            tabId: reply.tab_id,
+            focused: reply.focused,
+            ...(action === "blur" ? { wasFocused: reply.was_focused } : {}),
+          };
+        },
+        presentCall: (args) => ({
+          card: "terminal",
+          title: runtime.commandLine([
+            action,
+            args.target,
+            "--session",
+            args.session ?? "(current)",
+          ]),
+          description: action === "focus" ? "Focus an element" : "Remove focus from an element",
+        }),
+        presentResult: runtime.presentTerminalResult,
+      }),
+    );
+  }
+
   register(
     defineTool({
       name: "interact.select",
diff --git a/packages/dsh-plugin-browserskill/tests/tools.test.ts b/packages/dsh-plugin-browserskill/tests/tools.test.ts
index 7faf3fa..e144199 100644
--- a/packages/dsh-plugin-browserskill/tests/tools.test.ts
+++ b/packages/dsh-plugin-browserskill/tests/tools.test.ts
@@ -102,6 +102,8 @@ const ACTION_ROUTES: Record<string, readonly [string, string]> = {
   "inspect.network": ["browser_inspect", "network"],
   "interact.click": ["browser_interact", "click"],
   "interact.hover": ["browser_interact", "hover"],
+  "interact.focus": ["browser_interact", "focus"],
+  "interact.blur": ["browser_interact", "blur"],
   "interact.fill": ["browser_interact", "fill"],
   "interact.select": ["browser_interact", "select"],
   "interact.press": ["browser_interact", "press"],
@@ -200,7 +202,7 @@ const EXPECTED_ACTIONS = {
   browser_session: ["start", "stop", "list"],
   browser_page: ["navigate", "back", "forward", "reload", "wait"],
   browser_inspect: ["observe", "snapshot", "html", "screenshot", "console", "network"],
-  browser_interact: ["click", "hover", "fill", "select", "press"],
+  browser_interact: ["click", "hover", "focus", "blur", "fill", "select", "press"],
   browser_tabs: ["list", "create", "select", "close", "borrow", "return"],
   browser_assist: ["resize", "emulate", "request-help"],
 } as const;
@@ -499,6 +501,60 @@ describe("interaction tools", () => {
     ]);
   });
 
+  it.each([
+    "focus",
+    "blur",
+  ] as const)("interact.%s maps focus state, target, tab and timeout", async (action) => {
+    const { tools, calls } = setup({
+      "session start": START_REPLY("s1"),
+      [action]: {
+        tab_id: 7,
+        focused: action === "focus",
+        ...(action === "blur" ? { was_focused: true } : {}),
+      },
+    });
+    await startSession(tools);
+    const target = action === "focus" ? "@e3" : "#field";
+    const value = await tools
+      .get(`interact.${action}`)
+      ?.execute({ target, tabId: 7, timeoutMs: 150_000 }, makeExec());
+    expect(value).toEqual({
+      session: "s1",
+      tabId: 7,
+      focused: action === "focus",
+      ...(action === "blur" ? { wasFocused: true } : {}),
+    });
+    expect(calls[1].args).toEqual([
+      action,
+      "--session",
+      "s1",
+      "--tab-id",
+      "7",
+      "--timeout",
+      "150000ms",
+      target,
+    ]);
+    expect(calls[1].options.timeoutMs).toBe(165_000);
+  });
+
+  it.each([
+    "focus",
+    "blur",
+  ] as const)("interact.%s validates arguments and session ownership before running", async (action) => {
+    const { tools, calls } = setup({ "session start": START_REPLY("s1") });
+    await startSession(tools);
+    const tool = tools.get(`interact.${action}`)!;
+    await expect(tool.execute({}, makeExec())).rejects.toThrow(/invalid arguments/i);
+    await expect(tool.execute({ target: " " }, makeExec())).rejects.toThrow(/non-empty/i);
+    await expect(tool.execute({ target: "e1", timeoutMs: 0 }, makeExec())).rejects.toThrow(
+      /greater than zero/i,
+    );
+    await expect(tool.execute({ target: "e1", session: "foreign" }, makeExec())).rejects.toThrow(
+      /session/i,
+    );
+    expect(calls).toHaveLength(1);
+  });
+
   it("interact.fill passes value and --no-clear", async () => {
     const { tools, calls } = setup(responses);
     await startSession(tools);