diff --git a/apps/daemon/tests/runtimes/env-and-detection.test.ts b/apps/daemon/tests/runtimes/env-and-detection.test.ts
index a41a8ed97..8cc5e36c0 100644
--- a/apps/daemon/tests/runtimes/env-and-detection.test.ts
+++ b/apps/daemon/tests/runtimes/env-and-detection.test.ts
@@ -701,6 +701,30 @@ test('resolveAgentExecutable accepts Windows CODEX_BIN overrides with executable
   }
 });
 
+test('resolveAgentExecutable searches Windows fnm multishell shims under a minimal GUI PATH (#3062)', () => {
+  const home = mkdtempSync(join(tmpdir(), 'od-agent-fnm-multishell-'));
+  const localAppData = join(home, 'AppData', 'Local');
+  const fnmMultishell = join(localAppData, 'fnm_multishells', '12345-abcd');
+  try {
+    return withEnvSnapshot(['PATH', 'PATHEXT', 'OD_AGENT_HOME', 'LOCALAPPDATA'], () => {
+      mkdirSync(fnmMultishell, { recursive: true });
+      writeFileSync(join(fnmMultishell, 'codex.CMD'), '@echo off\r\nexit /b 0\r\n');
+      process.env.OD_AGENT_HOME = home;
+      process.env.LOCALAPPDATA = localAppData;
+      process.env.PATH = '';
+      process.env.PATHEXT = '.EXE;.CMD;.BAT';
+
+      const resolved = withPlatform('win32', () =>
+        resolveAgentExecutable(minimalAgentDef({ id: 'codex', bin: 'codex' })),
+      );
+
+      assert.equal(resolved, join(fnmMultishell, 'codex.CMD'));
+    });
+  } finally {
+    rmSync(home, { recursive: true, force: true });
+  }
+});
+
 test('detectAgents applies configured env while probing the CLI', async () => {
   const dir = mkdtempSync(join(tmpdir(), 'od-agent-env-'));
   try {
diff --git a/packages/platform/src/index.ts b/packages/platform/src/index.ts
index 50a9a2119..233869a66 100644
--- a/packages/platform/src/index.ts
+++ b/packages/platform/src/index.ts
@@ -987,6 +987,28 @@ export function wellKnownUserToolchainBins(
       dirs.push(dir);
     }
   }
+  if (process.platform === "win32") {
+    const localAppData =
+      resolveUserScopedHome(env.LOCALAPPDATA, home) ?? join(home, "AppData", "Local");
+    const appData =
+      resolveUserScopedHome(env.APPDATA, home) ?? join(home, "AppData", "Roaming");
+    dirs.push(join(appData, "npm"));
+    const fnmDir = typeof env.FNM_DIR === "string" ? env.FNM_DIR.trim() : "";
+    for (const root of [
+      join(localAppData, "fnm", "node-versions"),
+      ...(fnmDir.length > 0 ? [join(fnmDir, "node-versions")] : []),
+    ]) {
+      for (const dir of existingChildBinDirs(root, ["installation", "bin"])) {
+        dirs.push(dir);
+      }
+    }
+    // fnm exposes npm-global CLIs via per-shell shims under fnm_multishells
+    // after `fnm env`. GUI-launched Electron inherits a stripped PATH without
+    // those ephemeral dirs (issue #3062).
+    for (const dir of existingChildBinDirs(join(localAppData, "fnm_multishells"), [])) {
+      dirs.push(dir);
+    }
+  }
   return dirs;
 }
 
diff --git a/packages/platform/tests/index.test.ts b/packages/platform/tests/index.test.ts
index f5e6b3563..b981607e5 100644
--- a/packages/platform/tests/index.test.ts
+++ b/packages/platform/tests/index.test.ts
@@ -1042,4 +1042,35 @@ describe("wellKnownUserToolchainBins", () => {
       rmSync(home, { recursive: true, force: true });
     }
   });
+
+  it("includes Windows fnm node installs, multishell shims, and npm globals (#3062)", () => {
+    const originalPlatform = process.platform;
+    Object.defineProperty(process, "platform", { configurable: true, value: "win32" });
+    const home = mkdtempSync(join(tmpdir(), "wkutb-win-fnm-"));
+    const localAppData = join(home, "AppData", "Local");
+    const appData = join(home, "AppData", "Roaming");
+    const fnmNodeBin = join(localAppData, "fnm", "node-versions", "v20.20.2", "installation", "bin");
+    const fnmMultishell = join(localAppData, "fnm_multishells", "12345-abcd");
+    const npmGlobal = join(appData, "npm");
+    try {
+      mkdirSync(fnmNodeBin, { recursive: true });
+      mkdirSync(fnmMultishell, { recursive: true });
+      mkdirSync(npmGlobal, { recursive: true });
+      writeFileSync(join(fnmNodeBin, "marker"), "");
+      writeFileSync(join(fnmMultishell, "marker"), "");
+      writeFileSync(join(npmGlobal, "marker"), "");
+
+      const dirs = wellKnownUserToolchainBins({
+        home,
+        env: { LOCALAPPDATA: localAppData, APPDATA: appData },
+        includeSystemBins: false,
+      });
+      expect(dirs).toContain(fnmNodeBin);
+      expect(dirs).toContain(fnmMultishell);
+      expect(dirs).toContain(npmGlobal);
+    } finally {
+      Object.defineProperty(process, "platform", { configurable: true, value: originalPlatform });
+      rmSync(home, { recursive: true, force: true });
+    }
+  });
 });