diff --git a/config/scripts/ensure-native-runtime.mjs b/config/scripts/ensure-native-runtime.mjs
index 33870b3faa5..1796b309532 100644
--- a/config/scripts/ensure-native-runtime.mjs
+++ b/config/scripts/ensure-native-runtime.mjs
@@ -51,7 +51,18 @@ function readRuntimeArg() {
 
 function ensureNodeRuntime() {
   const initial = runNodeCheck()
-  if (initial.ok) {
+  const patchedNodePtyRebuildReason = getPatchedNodePtyRebuildReason()
+  if (initial.ok && !patchedNodePtyRebuildReason) {
+    return
+  }
+
+  if (patchedNodePtyRebuildReason) {
+    console.warn(`[native-runtime] ${patchedNodePtyRebuildReason}`)
+    if (!initial.ok) {
+      printCheckError(initial)
+    }
+    runPnpm(['rebuild', 'node-pty'])
+    verifyNodeRuntimeAfterRebuild()
     return
   }
 
@@ -61,7 +72,10 @@ function ensureNodeRuntime() {
   )
   printCheckError(initial)
   runPnpm(['rebuild', ...failedModules])
+  verifyNodeRuntimeAfterRebuild()
+}
 
+function verifyNodeRuntimeAfterRebuild() {
   const final = runNodeCheck()
   if (!final.ok) {
     console.error(
@@ -74,14 +88,22 @@ function ensureNodeRuntime() {
 
 function ensureElectronRuntime() {
   const initial = runElectronCheck()
-  if (initial.ok) {
+  const patchedNodePtyRebuildReason = getPatchedNodePtyRebuildReason()
+  if (initial.ok && !patchedNodePtyRebuildReason) {
     return
   }
 
-  console.warn(
-    `[native-runtime] ${formatRuntimeLabel('electron')} cannot load native modules; rebuilding native deps for Electron.`
-  )
-  printCheckError(initial)
+  if (patchedNodePtyRebuildReason) {
+    console.warn(`[native-runtime] ${patchedNodePtyRebuildReason}`)
+    if (!initial.ok) {
+      printCheckError(initial)
+    }
+  } else {
+    console.warn(
+      `[native-runtime] ${formatRuntimeLabel('electron')} cannot load native modules; rebuilding native deps for Electron.`
+    )
+    printCheckError(initial)
+  }
   runNodeScript(['config/scripts/rebuild-native-deps.mjs'])
 
   const final = runElectronCheck()
@@ -234,7 +256,12 @@ function loadNodePtyNativeModule() {
   const nativeName = getNodePtyNativeModuleName()
   // Why: node-pty's Windows JS wrapper defers conpty.node/pty.node until a
   // terminal is created, so require('node-pty') alone can miss ABI mismatches.
-  loadNativeModule(nativeName)
+  const native = loadNativeModule(nativeName)
+  if (requiresPatchedNodePtySourceBuild() && !isNodePtyReleaseBuildDir(native.dir)) {
+    throw new Error(
+      `node-pty resolved to ${native.dir}; expected build/Release so Orca's node-pty patch is active`
+    )
+  }
 }
 
 function getNodePtyNativeModuleName() {
@@ -245,6 +272,43 @@ function getNodePtyNativeModuleName() {
   return getWindowsBuildNumber() >= 18309 ? 'conpty' : 'pty'
 }
 
+function getPatchedNodePtyRebuildReason() {
+  if (!requiresPatchedNodePtySourceBuild()) {
+    return null
+  }
+
+  // Why: a loadable upstream node-pty prebuild is not enough; Orca's Unix
+  // patch only lands in the source-built build/Release artifacts.
+  const nodePtyDir = resolve(projectDir, 'node_modules', 'node-pty')
+  const missingArtifact = [
+    resolve(nodePtyDir, 'build', 'Release', 'pty.node'),
+    resolve(nodePtyDir, 'build', 'Release', 'spawn-helper')
+  ].find((artifactPath) => !existsSync(artifactPath))
+
+  if (!missingArtifact) {
+    return null
+  }
+
+  return 'Patched node-pty build artifacts are missing; rebuilding native deps.'
+}
+
+function requiresPatchedNodePtySourceBuild() {
+  if (process.platform === 'win32') {
+    return false
+  }
+
+  const nodePtyPatchPath = resolve(projectDir, 'config', 'patches', 'node-pty@1.1.0.patch')
+  if (!existsSync(nodePtyPatchPath)) {
+    return false
+  }
+
+  return existsSync(resolve(projectDir, 'node_modules', 'node-pty'))
+}
+
+function isNodePtyReleaseBuildDir(nativeDir) {
+  return typeof nativeDir === 'string' && nativeDir.replace(/\\/g, '/').includes('build/Release/')
+}
+
 function getWindowsBuildNumber() {
   const match = /(\d+)\.(\d+)\.(\d+)/g.exec(release())
   return match && match.length === 4 ? Number.parseInt(match[3], 10) : 0
diff --git a/config/scripts/ensure-native-runtime.test.mjs b/config/scripts/ensure-native-runtime.test.mjs
index 99e1a3760f9..d5d8396aeea 100644
--- a/config/scripts/ensure-native-runtime.test.mjs
+++ b/config/scripts/ensure-native-runtime.test.mjs
@@ -48,6 +48,75 @@ describe('ensure-native-runtime', () => {
       rmSync(projectDir, { recursive: true, force: true })
     }
   })
+
+  it.skipIf(process.platform === 'win32')(
+    'rebuilds patched node-pty artifacts even when the Node load check passes',
+    () => {
+      const projectDir = mkTempProject()
+
+      try {
+        const scriptPath = join(projectDir, 'config', 'scripts', 'ensure-native-runtime.mjs')
+        const logPath = join(projectDir, 'native-runtime.log')
+        const markerPath = join(projectDir, 'rebuilt.marker')
+        const binDir = join(projectDir, 'bin')
+        copyFileSync(sourceScriptPath, scriptPath)
+        writeLoadableNativeModules(projectDir)
+        writeNodePtyPatchFile(projectDir)
+        writeFakePnpm(binDir)
+
+        const result = spawnSync(process.execPath, [scriptPath, '--runtime=node'], {
+          cwd: projectDir,
+          encoding: 'utf8',
+          env: envWithPrependedPath(binDir, {
+            ORCA_NATIVE_TEST_LOG: logPath,
+            ORCA_NATIVE_TEST_MARKER: markerPath
+          })
+        })
+
+        expect(result.status, result.stderr).toBe(0)
+        expect(result.stderr).toContain(
+          'Patched node-pty build artifacts are missing; rebuilding native deps.'
+        )
+        expect(readFileSync(logPath, 'utf8')).toContain('pnpm rebuild node-pty\n')
+      } finally {
+        rmSync(projectDir, { recursive: true, force: true })
+      }
+    }
+  )
+
+  it.skipIf(process.platform === 'win32')(
+    'rebuilds when patched artifacts exist but node-pty resolves to prebuilds',
+    () => {
+      const projectDir = mkTempProject()
+
+      try {
+        const scriptPath = join(projectDir, 'config', 'scripts', 'ensure-native-runtime.mjs')
+        const logPath = join(projectDir, 'native-runtime.log')
+        const markerPath = join(projectDir, 'rebuilt.marker')
+        const binDir = join(projectDir, 'bin')
+        copyFileSync(sourceScriptPath, scriptPath)
+        writeLoadableNativeModules(projectDir)
+        writeNodePtyPatchFile(projectDir)
+        writePatchedNodePtyBuildArtifacts(projectDir)
+        writeFakePnpm(binDir)
+
+        const result = spawnSync(process.execPath, [scriptPath, '--runtime=node'], {
+          cwd: projectDir,
+          encoding: 'utf8',
+          env: envWithPrependedPath(binDir, {
+            ORCA_NATIVE_TEST_LOG: logPath,
+            ORCA_NATIVE_TEST_MARKER: markerPath
+          })
+        })
+
+        expect(result.status, result.stderr).toBe(0)
+        expect(result.stderr).toContain("expected build/Release so Orca's node-pty patch is active")
+        expect(readFileSync(logPath, 'utf8')).toContain('pnpm rebuild node-pty\n')
+      } finally {
+        rmSync(projectDir, { recursive: true, force: true })
+      }
+    }
+  )
 })
 
 function mkTempProject() {
@@ -92,6 +161,38 @@ exports.loadNativeModule = function loadNativeModule(nativeName) {
   )
 }
 
+function writeLoadableNativeModules(projectDir) {
+  const nodePtyDir = join(projectDir, 'node_modules', 'node-pty')
+  mkdirSync(join(nodePtyDir, 'lib'), { recursive: true })
+
+  writeFileSync(join(nodePtyDir, 'index.js'), 'module.exports = {}\n')
+  writeFileSync(
+    join(nodePtyDir, 'lib', 'utils.js'),
+    `
+const { appendFileSync, existsSync } = require('node:fs')
+
+exports.loadNativeModule = function loadNativeModule(nativeName) {
+  const rebuilt = existsSync(process.env.ORCA_NATIVE_TEST_MARKER)
+  const dir = rebuilt ? '../build/Release/' : '../prebuilds/' + process.platform + '-' + process.arch + '/'
+  appendFileSync(process.env.ORCA_NATIVE_TEST_LOG, \`node-pty load \${nativeName} dir=\${dir}\\n\`)
+  return { dir, module: {} }
+}
+`
+  )
+}
+
+function writeNodePtyPatchFile(projectDir) {
+  mkdirSync(join(projectDir, 'config', 'patches'), { recursive: true })
+  writeFileSync(join(projectDir, 'config', 'patches', 'node-pty@1.1.0.patch'), 'patch marker\n')
+}
+
+function writePatchedNodePtyBuildArtifacts(projectDir) {
+  const buildDir = join(projectDir, 'node_modules', 'node-pty', 'build', 'Release')
+  mkdirSync(buildDir, { recursive: true })
+  writeFileSync(join(buildDir, 'pty.node'), '')
+  writeFileSync(join(buildDir, 'spawn-helper'), '')
+}
+
 function writeFakePnpm(binDir) {
   mkdirSync(binDir, { recursive: true })
   const shimPath = join(binDir, 'pnpm-shim.cjs')
diff --git a/config/scripts/rebuild-native-deps.mjs b/config/scripts/rebuild-native-deps.mjs
index 715d65f7549..a56c45bc05f 100644
--- a/config/scripts/rebuild-native-deps.mjs
+++ b/config/scripts/rebuild-native-deps.mjs
@@ -59,7 +59,11 @@ const forceRebuild =
 
 ensureElectronPackageInstalled()
 
-if (!forceRebuild) {
+const patchedNodePtyRebuildReason = forceRebuild ? null : getPatchedNodePtyRebuildReason()
+
+if (patchedNodePtyRebuildReason) {
+  console.log(`[rebuild] ${patchedNodePtyRebuildReason}`)
+} else if (!forceRebuild) {
   // Why: Windows cannot unlink a loaded .node DLL, so avoid @electron/rebuild
   // when the current install already works with Electron's ABI.
   const probe = probeElectronNativeModules(onlyModules)
@@ -337,6 +341,45 @@ function getElectronExecutablePath() {
     : resolve(electronPackageDir, 'dist', platformPath)
 }
 
+function getPatchedNodePtyRebuildReason() {
+  if (!requiresPatchedNodePtySourceBuild()) {
+    return null
+  }
+
+  // Why: Orca patches node-pty's native Unix spawn path; upstream prebuilds can
+  // load successfully in Electron while missing the patched fd/error handling.
+  const nodePtyDir = resolve(projectDir, 'node_modules', 'node-pty')
+  const missingArtifact = [
+    resolve(nodePtyDir, 'build', 'Release', 'pty.node'),
+    resolve(nodePtyDir, 'build', 'Release', 'spawn-helper')
+  ].find((artifactPath) => !existsSync(artifactPath))
+
+  if (!missingArtifact) {
+    return null
+  }
+
+  return 'Patched node-pty build artifacts are missing; rebuilding from source.'
+}
+
+function requiresPatchedNodePtySourceBuild() {
+  if (!onlyModules.includes('node-pty')) {
+    return false
+  }
+  if (rebuildPlatform === 'win32') {
+    return false
+  }
+  if (rebuildPlatform !== osPlatform() || rebuildArch !== process.arch) {
+    return false
+  }
+
+  const nodePtyPatchPath = resolve(projectDir, 'config', 'patches', 'node-pty@1.1.0.patch')
+  if (!existsSync(nodePtyPatchPath)) {
+    return false
+  }
+
+  return existsSync(resolve(projectDir, 'node_modules', 'node-pty'))
+}
+
 function probeElectronNativeModules(moduleNames) {
   if (!electronPackageIsUsable()) {
     return { ok: false, status: null, stderr: 'Electron package binary is unavailable.' }
@@ -349,6 +392,7 @@ const { release } = require('node:os')
 const { resolve } = require('node:path')
 const projectRequire = createRequire(resolve(process.cwd(), 'package.json'))
 const moduleNames = ${JSON.stringify(moduleNames)}
+const requirePatchedNodePtySourceBuild = ${JSON.stringify(requiresPatchedNodePtySourceBuild())}
 const failures = []
 
 for (const moduleName of moduleNames) {
@@ -368,12 +412,23 @@ function loadNativeModule(moduleName) {
   if (moduleName === 'node-pty') {
     projectRequire('node-pty')
     const { loadNativeModule } = projectRequire('node-pty/lib/utils')
-    loadNativeModule(getNodePtyNativeModuleName())
+    const native = loadNativeModule(getNodePtyNativeModuleName())
+    if (requirePatchedNodePtySourceBuild && !isNodePtyReleaseBuildDir(native.dir)) {
+      throw new Error(
+        'node-pty resolved to ' +
+          native.dir +
+          '; expected build/Release so Orca\\'s node-pty patch is active'
+      )
+    }
     return
   }
   projectRequire(moduleName)
 }
 
+function isNodePtyReleaseBuildDir(nativeDir) {
+  return typeof nativeDir === 'string' && nativeDir.replace(/\\\\/g, '/').includes('build/Release/')
+}
+
 function getNodePtyNativeModuleName() {
   if (process.platform !== 'win32') {
     return 'pty'
diff --git a/config/scripts/rebuild-native-deps.test.mjs b/config/scripts/rebuild-native-deps.test.mjs
index 55ff6c41fbf..23e7a80640f 100644
--- a/config/scripts/rebuild-native-deps.test.mjs
+++ b/config/scripts/rebuild-native-deps.test.mjs
@@ -2,6 +2,7 @@ import { spawnSync } from 'node:child_process'
 import {
   chmodSync,
   copyFileSync,
+  existsSync,
   mkdirSync,
   mkdtempSync,
   readFileSync,
@@ -122,6 +123,97 @@ describe('rebuild-native-deps Electron install fallback', () => {
   })
 })
 
+describe('rebuild-native-deps patched node-pty rebuild', () => {
+  it.skipIf(process.platform === 'win32')(
+    'rebuilds when Electron can load node-pty but patched build artifacts are missing',
+    () => {
+      const projectDir = mkTempProject()
+
+      try {
+        const rebuildLogPath = join(projectDir, 'electron-rebuild.log')
+        writeFakeUsableElectronPackage(projectDir)
+        writeFakeElectronRebuild(projectDir, { logPathEnv: 'ORCA_REBUILD_TEST_LOG' })
+        writeFakeLoadableNodePty(projectDir)
+        writeNodePtyPatchFile(projectDir)
+
+        const result = runRebuildScript(projectDir, {
+          ORCA_REBUILD_TEST_LOG: rebuildLogPath
+        })
+
+        expect(result.status, result.stderr).toBe(0)
+        expect(result.stdout).toContain(
+          'Patched node-pty build artifacts are missing; rebuilding from source.'
+        )
+
+        const rebuildCall = JSON.parse(readFileSync(rebuildLogPath, 'utf8').trim())
+        expect(rebuildCall.onlyModules).toEqual(['node-pty'])
+        expect(rebuildCall.ignoreModules).toEqual(['cpu-features'])
+        expect(rebuildCall.force).toBe(true)
+      } finally {
+        rmSync(projectDir, { recursive: true, force: true })
+      }
+    }
+  )
+
+  it.skipIf(process.platform === 'win32')(
+    'keeps the Electron load-probe fast path once patched node-pty artifacts exist',
+    () => {
+      const projectDir = mkTempProject()
+
+      try {
+        const rebuildLogPath = join(projectDir, 'electron-rebuild.log')
+        writeFakeUsableElectronPackage(projectDir)
+        writeFakeElectronRebuild(projectDir, { logPathEnv: 'ORCA_REBUILD_TEST_LOG' })
+        writeFakeLoadableNodePty(projectDir, { nativeDir: '../build/Release/' })
+        writeNodePtyPatchFile(projectDir)
+        writePatchedNodePtyBuildArtifacts(projectDir)
+
+        const result = runRebuildScript(projectDir, {
+          ORCA_REBUILD_TEST_LOG: rebuildLogPath
+        })
+
+        expect(result.status, result.stderr).toBe(0)
+        expect(result.stdout).toContain(
+          'Native modules already load in Electron; skipping rebuild.'
+        )
+        expect(existsSync(rebuildLogPath)).toBe(false)
+      } finally {
+        rmSync(projectDir, { recursive: true, force: true })
+      }
+    }
+  )
+
+  it.skipIf(process.platform === 'win32')(
+    'rebuilds when patched artifacts exist but Electron falls back to node-pty prebuilds',
+    () => {
+      const projectDir = mkTempProject()
+
+      try {
+        const rebuildLogPath = join(projectDir, 'electron-rebuild.log')
+        writeFakeUsableElectronPackage(projectDir)
+        writeFakeElectronRebuild(projectDir, { logPathEnv: 'ORCA_REBUILD_TEST_LOG' })
+        writeFakeLoadableNodePty(projectDir, { nativeDir: '../prebuilds/darwin-arm64/' })
+        writeNodePtyPatchFile(projectDir)
+        writePatchedNodePtyBuildArtifacts(projectDir)
+
+        const result = runRebuildScript(projectDir, {
+          ORCA_REBUILD_TEST_LOG: rebuildLogPath
+        })
+
+        expect(result.status, result.stderr).toBe(0)
+        expect(result.stdout).toContain('Native modules do not load in Electron; rebuilding.')
+        expect(result.stdout).toContain("expected build/Release so Orca's node-pty patch is active")
+
+        const rebuildCall = JSON.parse(readFileSync(rebuildLogPath, 'utf8').trim())
+        expect(rebuildCall.onlyModules).toEqual(['node-pty'])
+        expect(rebuildCall.force).toBe(true)
+      } finally {
+        rmSync(projectDir, { recursive: true, force: true })
+      }
+    }
+  )
+})
+
 function mkTempProject() {
   const projectDir = mkdtempSync(join(tmpdir(), 'orca-rebuild-native-deps-'))
   mkdirSync(join(projectDir, 'config', 'scripts'), { recursive: true })
@@ -225,9 +317,89 @@ module.exports = async function extract(_zipPath, options) {
   chmodSync(join(extractDir, 'index.js'), 0o755)
 }
 
-function writeFakeElectronRebuild(projectDir) {
+function writeFakeElectronRebuild(projectDir, { logPathEnv = null } = {}) {
   const rebuildDir = join(projectDir, 'node_modules', '@electron', 'rebuild')
   mkdirSync(rebuildDir, { recursive: true })
   writeFileSync(join(rebuildDir, 'package.json'), JSON.stringify({ type: 'module' }))
-  writeFileSync(join(rebuildDir, 'index.js'), 'export async function rebuild() {}\n')
+  writeFileSync(
+    join(rebuildDir, 'index.js'),
+    logPathEnv
+      ? `
+import { appendFileSync } from 'node:fs'
+
+export async function rebuild(options) {
+  const logPath = process.env[${JSON.stringify(logPathEnv)}]
+  if (!logPath) {
+    return
+  }
+  appendFileSync(
+    logPath,
+    JSON.stringify({
+      arch: options.arch,
+      electronVersion: options.electronVersion,
+      force: options.force,
+      ignoreModules: options.ignoreModules,
+      onlyModules: options.onlyModules,
+      platform: options.platform
+    }) + '\\n'
+  )
+}
+`
+      : 'export async function rebuild() {}\n'
+  )
+}
+
+function writeFakeUsableElectronPackage(projectDir) {
+  writeFakeElectronPackage(projectDir)
+  const electronDir = join(projectDir, 'node_modules', 'electron')
+  const electronPath = join(electronDir, 'dist', 'electron')
+  mkdirSync(join(electronDir, 'dist'), { recursive: true })
+  writeFileSync(join(electronDir, 'path.txt'), 'electron')
+  writeFileSync(join(electronDir, 'dist', 'version'), 'v41.5.0')
+  writeFileSync(
+    electronPath,
+    `#!/usr/bin/env node
+const { spawnSync } = require('node:child_process')
+
+const result = spawnSync(process.execPath, process.argv.slice(2), {
+  cwd: process.cwd(),
+  env: process.env,
+  stdio: 'inherit'
+})
+
+if (result.error) {
+  console.error(result.error.message)
+  process.exit(1)
+}
+
+process.exit(result.status ?? 0)
+`
+  )
+  chmodSync(electronPath, 0o755)
+}
+
+function writeFakeLoadableNodePty(projectDir, { nativeDir = 'prebuilds/pty' } = {}) {
+  const nodePtyDir = join(projectDir, 'node_modules', 'node-pty')
+  mkdirSync(join(nodePtyDir, 'lib'), { recursive: true })
+  writeFileSync(join(nodePtyDir, 'index.js'), 'module.exports = {}\n')
+  writeFileSync(
+    join(nodePtyDir, 'lib', 'utils.js'),
+    `
+exports.loadNativeModule = function loadNativeModule(nativeName) {
+  return { dir: ${JSON.stringify(nativeDir)}, module: { nativeName } }
+}
+`
+  )
+}
+
+function writeNodePtyPatchFile(projectDir) {
+  mkdirSync(join(projectDir, 'config', 'patches'), { recursive: true })
+  writeFileSync(join(projectDir, 'config', 'patches', 'node-pty@1.1.0.patch'), 'patch marker\n')
+}
+
+function writePatchedNodePtyBuildArtifacts(projectDir) {
+  const buildDir = join(projectDir, 'node_modules', 'node-pty', 'build', 'Release')
+  mkdirSync(buildDir, { recursive: true })
+  writeFileSync(join(buildDir, 'pty.node'), '')
+  writeFileSync(join(buildDir, 'spawn-helper'), '')
 }