diff --git a/packages/vite/package.json b/packages/vite/package.json
index 4afe92d0e43eef..ed039f9b1fcff6 100644
--- a/packages/vite/package.json
+++ b/packages/vite/package.json
@@ -73,6 +73,7 @@
   },
   "//": "READ CONTRIBUTING.md to understand what to put under deps vs. devDeps!",
   "dependencies": {
+    "@voidzero-dev/vite-task-client": "^0.1.1",
     "lightningcss": "^1.32.0",
     "picomatch": "^4.0.4",
     "postcss": "^8.5.15",
diff --git a/packages/vite/src/node/config.ts b/packages/vite/src/node/config.ts
index 53bdd1ca7c1b4a..ebd09428bfc781 100644
--- a/packages/vite/src/node/config.ts
+++ b/packages/vite/src/node/config.ts
@@ -6,6 +6,11 @@ import { inspect, promisify } from 'node:util'
 import { performance } from 'node:perf_hooks'
 import { createRequire } from 'node:module'
 import crypto from 'node:crypto'
+import {
+  getEnv,
+  ignoreInput,
+  ignoreOutput,
+} from '@voidzero-dev/vite-task-client'
 import colors from 'picocolors'
 import picomatch from 'picomatch'
 import {
@@ -1401,6 +1406,14 @@ export async function resolveConfig(
 
   let configFileDependencies: string[] = []
   let mode = inlineConfig.mode || defaultMode
+  // When `NODE_ENV` isn't set locally, ask Vite Task for it; the runner
+  // also records the env in the build's cache key.
+  if (process.env.NODE_ENV === undefined) {
+    const nodeEnv = getEnv('NODE_ENV')
+    if (nodeEnv !== undefined) {
+      process.env.NODE_ENV = nodeEnv
+    }
+  }
   const isNodeEnvSet = !!process.env.NODE_ENV
   const packageCache: PackageCache = new Map()
 
@@ -2581,6 +2594,11 @@ async function loadConfigFromBundledFile(
           `.vite-temp/${path.basename(fileName)}.${hash}.mjs`,
         )
       : `${fileName}.${hash}.mjs`
+
+    // Tell Vite Task to ignore this transient file as both input and output,
+    // so the read-write of this file doesn't affect the cache fingerprints.
+    ignoreInput(tempFileName)
+    ignoreOutput(tempFileName)
     await fsp.writeFile(tempFileName, bundledCode)
     try {
       return (await import(pathToFileURL(tempFileName).href)).default
diff --git a/packages/vite/src/node/env.ts b/packages/vite/src/node/env.ts
index 9ca5d4d29e4a1f..e80c23cd5cfe6f 100644
--- a/packages/vite/src/node/env.ts
+++ b/packages/vite/src/node/env.ts
@@ -2,6 +2,7 @@ import fs from 'node:fs'
 import path from 'node:path'
 // eslint-disable-next-line n/no-unsupported-features/node-builtins -- our supported nodejs range supports `parseEnv` but in experimental state, which is fine
 import { parseEnv } from 'node:util'
+import { getEnvs } from '@voidzero-dev/vite-task-client'
 import { type DotenvPopulateInput, expand } from 'dotenv-expand'
 import colors from 'picocolors'
 import { arraify, createDebugger, normalizePath, tryStatSync } from './utils'
@@ -82,6 +83,12 @@ export function loadEnv(
     }
   }
 
+  // Vite Task may know prefixed envs not present here; fetch them and let
+  // the runner record each glob in the build's cache key.
+  for (const prefix of prefixes) {
+    Object.assign(env, getEnvs(`${prefix}*`))
+  }
+
   // check if there are actual env variables starting with VITE_*
   // these are typically provided inline and should be prioritized
   for (const key in process.env) {
diff --git a/packages/vite/src/node/optimizer/index.ts b/packages/vite/src/node/optimizer/index.ts
index 14186ddef51a71..c88de8003208d3 100644
--- a/packages/vite/src/node/optimizer/index.ts
+++ b/packages/vite/src/node/optimizer/index.ts
@@ -3,6 +3,7 @@ import fsp from 'node:fs/promises'
 import path from 'node:path'
 import { promisify } from 'node:util'
 import { performance } from 'node:perf_hooks'
+import { ignoreInput, ignoreOutput } from '@voidzero-dev/vite-task-client'
 import colors from 'picocolors'
 import { init, parse } from 'es-module-lexer'
 import { isDynamicPattern } from 'tinyglobby'
@@ -397,6 +398,14 @@ export async function loadCachedDepOptimizationMetadata(
 
   const depsCacheDir = getDepsCacheDir(environment)
 
+  // When run inside Vite Task, the dep optimizer cache is both read and
+  // written under this directory (metadata + pre-bundled deps). Tell Vite
+  // Task to treat it as neither a build input nor a build output: the
+  // lockfile hash stored in the metadata already drives re-optimization,
+  // and the cache is process-local scratch space, not a build artifact.
+  ignoreInput(depsCacheDir)
+  ignoreOutput(depsCacheDir)
+
   if (!force) {
     let cachedMetadata: DepOptimizationMetadata | undefined
     try {
diff --git a/packages/vite/src/node/plugins/prepareOutDir.ts b/packages/vite/src/node/plugins/prepareOutDir.ts
index 6f5f16544cabdc..e41d7a15dda846 100644
--- a/packages/vite/src/node/plugins/prepareOutDir.ts
+++ b/packages/vite/src/node/plugins/prepareOutDir.ts
@@ -1,5 +1,6 @@
 import fs from 'node:fs'
 import path from 'node:path'
+import { ignoreInput } from '@voidzero-dev/vite-task-client'
 import colors from 'picocolors'
 import type { Plugin } from '../plugin'
 import { getResolvedOutDirs, resolveEmptyOutDir } from '../watch'
@@ -51,6 +52,11 @@ function prepareOutDir(
   const { publicDir } = environment.config
   const outDirsArray = [...outDirs]
   for (const outDir of outDirs) {
+    // When run inside Vite Task, `emptyDir` below reads the entries of
+    // `outDir`. Without this, those reads would be recorded as build inputs
+    // and mix with the writes that follow, tripping Vite Task's read-write
+    // overlap check.
+    ignoreInput(outDir)
     if (emptyOutDir !== false && fs.existsSync(outDir)) {
       // skip those other outDirs which are nested in current outDir
       const skipDirs = outDirsArray
diff --git a/packages/vite/src/node/preview.ts b/packages/vite/src/node/preview.ts
index 25752ba1c146a8..ac34549420e126 100644
--- a/packages/vite/src/node/preview.ts
+++ b/packages/vite/src/node/preview.ts
@@ -4,6 +4,7 @@ import sirv from 'sirv'
 import compression from '@polka/compression'
 import connect from 'connect'
 import corsMiddleware from 'cors'
+import { disableCache } from '@voidzero-dev/vite-task-client'
 import type { Connect } from '#dep-types/connect'
 import type {
   HttpServer,
@@ -126,6 +127,10 @@ export type PreviewServerHook = (
 export async function preview(
   inlineConfig: InlineConfig = {},
 ): Promise<PreviewServer> {
+  // The preview server is a long-running, interactive process whose
+  // responses cannot be replayed from a cache.
+  disableCache()
+
   const config = await resolveConfig(
     inlineConfig,
     'serve',
diff --git a/packages/vite/src/node/server/index.ts b/packages/vite/src/node/server/index.ts
index 0ec61e2d4683cd..722c19d2aba421 100644
--- a/packages/vite/src/node/server/index.ts
+++ b/packages/vite/src/node/server/index.ts
@@ -12,6 +12,7 @@ import colors from 'picocolors'
 import chokidar from 'chokidar'
 import launchEditorMiddleware from 'launch-editor-middleware'
 import { determineAgent } from '@vercel/detect-agent'
+import { disableCache } from '@voidzero-dev/vite-task-client'
 import type { SourceMap } from 'rolldown'
 import type { ModuleRunner } from 'vite/module-runner'
 import type { FSWatcher, WatchOptions } from '#dep-types/chokidar'
@@ -483,6 +484,10 @@ export async function _createServer(
     previousForceOptimizeOnRestart?: boolean
   },
 ): Promise<ViteDevServer> {
+  // The dev server is a long-running, interactive process whose outputs
+  // (network responses, HMR updates) cannot be replayed from a cache.
+  disableCache()
+
   const config = isResolvedConfig(inlineConfig)
     ? inlineConfig
     : await resolveConfig(inlineConfig, 'serve')
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 51b98504ab8859..adc04d6f734a40 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -241,6 +241,9 @@ importers:
 
   packages/vite:
     dependencies:
+      '@voidzero-dev/vite-task-client':
+        specifier: ^0.1.1
+        version: 0.1.1
       lightningcss:
         specifier: ^1.32.0
         version: 1.32.0
@@ -4683,6 +4686,10 @@ packages:
   '@vitest/utils@4.1.7':
     resolution: {integrity: sha512-T532WBu791cBxJlCl6SO+J14l81DQx6uQHm1bQbmCDY7nqlEIgkza/UFnSBNaUtSf41unldDFjdOBYEQC4b5Hw==}
 
+  '@voidzero-dev/vite-task-client@0.1.1':
+    resolution: {integrity: sha512-9zGnSzvzUOKNoMf4zxaDeAyerkvnsXBRWfbTkwhwHsVJFug3j48Et8kr+ulHf3KRdcLr07Np+xDuCvHYVK1k7w==}
+    engines: {node: '>=18'}
+
   '@voidzero-dev/vitepress-theme@4.8.4':
     resolution: {integrity: sha512-o7R2g9OPu5iLW3R4PNkj+JRSIncO8f1hTY0YvO13OMP/kytKUn8MLhy4kTvx+IMRSLeqrGfrBpze/OEPKzcLUQ==}
     peerDependencies:
@@ -10723,6 +10730,8 @@ snapshots:
       convert-source-map: 2.0.0
       tinyrainbow: 3.1.0
 
+  '@voidzero-dev/vite-task-client@0.1.1': {}
+
   '@voidzero-dev/vitepress-theme@4.8.4(focus-trap@8.0.1)(vite@packages+vite)(vitepress@2.0.0-alpha.17)(vue@3.5.35)':
     dependencies:
       '@docsearch/css': 4.5.4