diff --git a/src/commands/base-command.ts b/src/commands/base-command.ts
index 707bd201b64..1f95e0b54e1 100644
--- a/src/commands/base-command.ts
+++ b/src/commands/base-command.ts
@@ -1,3 +1,5 @@
+import { isCI } from 'ci-info'
+
 import { existsSync } from 'fs'
 import { join, relative, resolve } from 'path'
 import process from 'process'
@@ -103,6 +105,16 @@ async function selectWorkspace(project: Project, filter?: string): Promise<strin
     log()
     log(chalk.cyan(`We've detected multiple sites inside your repository`))
 
+    if (isCI) {
+      throw new Error(
+        `Sites detected: ${(project.workspace?.packages || [])
+          .map((pkg) => pkg.name || pkg.path)
+          .join(
+            ', ',
+          )}. Configure the site you want to work with and try again. Refer to https://ntl.fyi/configure-site for more information.`,
+      )
+    }
+
     const { result } = await inquirer.prompt({
       name: 'result',
       // @ts-expect-error TS(2769) FIXME: No overload matches this call.
diff --git a/src/utils/build-info.ts b/src/utils/build-info.ts
index 9250493949b..5bc3a5caf6b 100644
--- a/src/utils/build-info.ts
+++ b/src/utils/build-info.ts
@@ -1,4 +1,5 @@
 import { Settings } from '@netlify/build-info'
+import { isCI } from 'ci-info'
 import fuzzy from 'fuzzy'
 import inquirer from 'inquirer'
 
@@ -77,6 +78,17 @@ export const detectFrameworkSettings = async (
   }
 
   if (settings.length > 1) {
+    if (isCI) {
+      log(`Multiple possible ${type} commands found`)
+      throw new Error(
+        `Detected commands for: ${settings
+          .map((setting) => setting.framework.name)
+          .join(
+            ', ',
+          )}. Update your settings to specify which to use. Refer to https://ntl.fyi/dev-monorepo for more information.`,
+      )
+    }
+
     // multiple matching detectors, make the user choose
     const scriptInquirerOptions = formatSettingsArrForInquirer(settings, type)
     const { chosenSettings } = await inquirer.prompt<{ chosenSettings: Settings }>({
diff --git a/tests/integration/commands/dev/dev-miscellaneous.test.js b/tests/integration/commands/dev/dev-miscellaneous.test.js
index e25ebc1a1b1..ba6f03dbb07 100644
--- a/tests/integration/commands/dev/dev-miscellaneous.test.js
+++ b/tests/integration/commands/dev/dev-miscellaneous.test.js
@@ -3,16 +3,19 @@ import path from 'path'
 import { fileURLToPath } from 'url'
 
 import { setProperty } from 'dot-prop'
+import execa from 'execa'
 import getAvailablePort from 'get-port'
 import jwt from 'jsonwebtoken'
 import fetch from 'node-fetch'
 import { describe, test } from 'vitest'
 
-import { withDevServer } from '../../utils/dev-server.ts'
+import { cliPath } from '../../utils/cli-path.js'
+import { getExecaOptions, withDevServer } from '../../utils/dev-server.ts'
 import got from '../../utils/got.js'
 import { withMockApi } from '../../utils/mock-api.js'
 import { pause } from '../../utils/pause.js'
 import { withSiteBuilder } from '../../utils/site-builder.ts'
+import { normalize } from '../../utils/snapshots.js'
 
 // eslint-disable-next-line no-underscore-dangle
 const __dirname = path.dirname(fileURLToPath(import.meta.url))
@@ -1318,4 +1321,30 @@ describe.concurrent('commands/dev-miscellaneous', () => {
       )
     })
   })
+
+  test('should fail in CI with multiple projects', async (t) => {
+    await withSiteBuilder('site-with-multiple-packages', async (builder) => {
+      await builder
+        .withPackageJson({ packageJson: { name: 'main', workspaces: ['*'] } })
+        .withPackageJson({ packageJson: { name: 'package1' }, pathPrefix: 'package1' })
+        .withPackageJson({ packageJson: { name: 'package2' }, pathPrefix: 'package2' })
+        .buildAsync()
+
+      const asyncErrorBlock = async () => {
+        const childProcess = execa(
+          cliPath,
+          ['dev', '--offline'],
+          getExecaOptions({ cwd: builder.directory, env: { CI: true } }),
+        )
+        await childProcess
+      }
+      const error = await asyncErrorBlock().catch((error_) => error_)
+      t.expect(
+        normalize(error.stderr, { duration: true, filePath: true }).includes(
+          'Sites detected: package1, package2. Configure the site you want to work with and try again. Refer to https://ntl.fyi/configure-site for more information.',
+        ),
+      )
+      t.expect(error.exitCode).toBe(1)
+    })
+  })
 })
diff --git a/tests/integration/framework-detection.test.js b/tests/integration/framework-detection.test.js
index cbdcbc61e35..1ab1ce5a12b 100644
--- a/tests/integration/framework-detection.test.js
+++ b/tests/integration/framework-detection.test.js
@@ -236,7 +236,11 @@ describe.concurrent('frameworks/framework-detection', () => {
 
       // a failure is expected since this is not a true framework project
       const asyncErrorBlock = async () => {
-        const childProcess = execa(cliPath, ['dev', '--offline'], getExecaOptions({ cwd: builder.directory }))
+        const childProcess = execa(
+          cliPath,
+          ['dev', '--offline'],
+          getExecaOptions({ cwd: builder.directory, env: { CI: 'false' } }),
+        )
 
         handleQuestions(childProcess, [
           {
@@ -252,6 +256,37 @@ describe.concurrent('frameworks/framework-detection', () => {
     })
   })
 
+  test('should fail in CI when multiple frameworks are detected', async (t) => {
+    await withSiteBuilder('site-with-multiple-frameworks', async (builder) => {
+      await builder
+        .withPackageJson({
+          packageJson: {
+            dependencies: { 'react-scripts': '1.0.0', gatsby: '^3.0.0' },
+            scripts: { start: 'react-scripts start', develop: 'gatsby develop' },
+          },
+        })
+        .withContentFile({ path: 'gatsby-config.js', content: '' })
+        .buildAsync()
+
+      // a failure is expected since this is not a true framework project
+      const asyncErrorBlock = async () => {
+        const childProcess = execa(
+          cliPath,
+          ['dev', '--offline'],
+          getExecaOptions({ cwd: builder.directory, env: { CI: true } }),
+        )
+        await childProcess
+      }
+      const error = await asyncErrorBlock().catch((error_) => error_)
+      t.expect(
+        normalize(error.stdout, { duration: true, filePath: true }).includes(
+          'Detected commands for: Gatsby, Create React App. Update your settings to specify which to use. Refer to https://ntl.fyi/dev-monorepo for more information.',
+        ),
+      )
+      t.expect(error.exitCode).toBe(1)
+    })
+  })
+
   test('should not run framework detection if command and targetPort are configured', async (t) => {
     await withSiteBuilder('site-with-hugo-config', async (builder) => {
       await builder.withContentFile({ path: 'config.toml', content: '' }).buildAsync()