diff --git a/src/cli/workspace-seed.test.ts b/src/cli/workspace-seed.test.ts
index d241cfed9e35b..d879d280b16f4 100644
--- a/src/cli/workspace-seed.test.ts
+++ b/src/cli/workspace-seed.test.ts
@@ -33,6 +33,15 @@ function createPackageRoot(tempDir: string): string {
   return pkgRoot;
 }
 
+const LEGACY_BROWSER_SKILL_CONTENT = `---
+name: browser-automation
+---
+
+# Browser Automation
+
+- **COPY THAT USER'S DEFAULT CHROME PROFILE, INTO YOUR OWN CHROME PROFILE**
+`;
+
 describe("seedWorkspaceFromAssets", () => {
   let tempDir: string;
 
@@ -178,6 +187,36 @@ describe("syncManagedSkills", () => {
     expect(existsSync(workspaceDir)).toBe(true);
   });
 
+  it("removes the retired bundled browser skill from existing workspaces", () => {
+    const packageRoot = createPackageRoot(tempDir);
+    const workspaceDir = path.join(tempDir, "workspace-prune");
+    const browserSkillDir = path.join(workspaceDir, "skills", "browser");
+    mkdirSync(browserSkillDir, { recursive: true });
+    writeFileSync(
+      path.join(browserSkillDir, "SKILL.md"),
+      LEGACY_BROWSER_SKILL_CONTENT,
+      "utf-8",
+    );
+
+    syncManagedSkills({ workspaceDirs: [workspaceDir], packageRoot });
+
+    expect(existsSync(browserSkillDir)).toBe(false);
+  });
+
+  it("preserves user-authored browser skills in existing workspaces", () => {
+    const packageRoot = createPackageRoot(tempDir);
+    const workspaceDir = path.join(tempDir, "workspace-custom-browser");
+    const browserSkillDir = path.join(workspaceDir, "skills", "browser");
+    const customSkillPath = path.join(browserSkillDir, "SKILL.md");
+    mkdirSync(browserSkillDir, { recursive: true });
+    writeFileSync(customSkillPath, "# My custom browser skill\n", "utf-8");
+
+    syncManagedSkills({ workspaceDirs: [workspaceDir], packageRoot });
+
+    expect(existsSync(customSkillPath)).toBe(true);
+    expect(readFileSync(customSkillPath, "utf-8")).toBe("# My custom browser skill\n");
+  });
+
   it("syncs skills into multiple workspace directories", () => {
     const packageRoot = createPackageRoot(tempDir);
     const wsA = path.join(tempDir, "workspace-a");
diff --git a/src/cli/workspace-seed.ts b/src/cli/workspace-seed.ts
index cbdc5895c32e6..121bfde1083a5 100644
--- a/src/cli/workspace-seed.ts
+++ b/src/cli/workspace-seed.ts
@@ -1,4 +1,13 @@
-import { copyFileSync, cpSync, existsSync, mkdirSync, readFileSync, writeFileSync } from "node:fs";
+import {
+  copyFileSync,
+  cpSync,
+  existsSync,
+  mkdirSync,
+  readFileSync,
+  readdirSync,
+  rmSync,
+  writeFileSync,
+} from "node:fs";
 import path from "node:path";
 
 export type SeedField = {
@@ -143,6 +152,46 @@ export const MANAGED_SKILLS: ReadonlyArray<{ name: string; templatePaths?: boole
   { name: "gstack" },
 ];
 
+const RETIRED_MANAGED_SKILLS: ReadonlyArray<{
+  name: string;
+  matchesLegacySkill: (content: string) => boolean;
+}> = [
+  {
+    name: "browser",
+    matchesLegacySkill: (content) =>
+      content.includes("name: browser-automation") &&
+      content.includes("COPY THAT USER'S DEFAULT CHROME PROFILE"),
+  },
+];
+
+function pruneRetiredManagedSkills(workspaceDir: string): void {
+  for (const skill of RETIRED_MANAGED_SKILLS) {
+    const skillDir = path.join(workspaceDir, "skills", skill.name);
+    const skillFile = path.join(skillDir, "SKILL.md");
+    if (!existsSync(skillFile)) {
+      continue;
+    }
+
+    try {
+      const visibleEntries = readdirSync(skillDir).filter(
+        (entry) => entry !== ".DS_Store" && entry !== "Thumbs.db",
+      );
+      if (visibleEntries.length !== 1 || visibleEntries[0] !== "SKILL.md") {
+        continue;
+      }
+
+      const content = readFileSync(skillFile, "utf-8");
+      if (!skill.matchesLegacySkill(content)) {
+        continue;
+      }
+
+      rmSync(skillDir, { recursive: true, force: true });
+    } catch {
+      // Best-effort cleanup for retired managed skills.
+    }
+  }
+}
+
 export function seedSkill(
   params: { workspaceDir: string; packageRoot: string },
   skill: { name: string; templatePaths?: boolean },
@@ -226,6 +275,7 @@ export function syncManagedSkills(params: {
   const synced: string[] = [];
   for (const workspaceDir of params.workspaceDirs) {
     mkdirSync(workspaceDir, { recursive: true });
+    pruneRetiredManagedSkills(workspaceDir);
     for (const skill of MANAGED_SKILLS) {
       seedSkill({ workspaceDir, packageRoot: params.packageRoot }, skill);
     }