diff --git a/packages/builtin-tools/src/tools/FileEditTool/FileEditTool.ts b/packages/builtin-tools/src/tools/FileEditTool/FileEditTool.ts
index 29c937b0b..81bf2d67a 100644
--- a/packages/builtin-tools/src/tools/FileEditTool/FileEditTool.ts
+++ b/packages/builtin-tools/src/tools/FileEditTool/FileEditTool.ts
@@ -70,7 +70,6 @@ import {
   areFileEditsInputsEquivalent,
   findActualString,
   getPatchForEdit,
-  preserveQuoteStyle,
 } from './utils.js'
 
 // V8/Bun string length limit is ~2^30 characters (~1 billion). For typical
@@ -297,7 +296,7 @@ export const FileEditTool = buildTool({
 
     const file = fileContent
 
-    // Use findActualString to handle quote normalization
+    // Use findActualString to find exact match
     const actualOldString = findActualString(file, old_string)
     if (!actualOldString) {
       return {
@@ -452,23 +451,16 @@ export const FileEditTool = buildTool({
       }
     }
 
-    // 3. Use findActualString to handle quote normalization
+    // 3. Find the exact string in file content
     const actualOldString =
       findActualString(originalFileContents, old_string) || old_string
 
-    // Preserve curly quotes in new_string when the file uses them
-    const actualNewString = preserveQuoteStyle(
-      old_string,
-      actualOldString,
-      new_string,
-    )
-
     // 4. Generate patch
     const { patch, updatedFile } = getPatchForEdit({
       filePath: absoluteFilePath,
       fileContents: originalFileContents,
       oldString: actualOldString,
-      newString: actualNewString,
+      newString: new_string,
       replaceAll: replace_all,
     })
 
diff --git a/packages/builtin-tools/src/tools/FileEditTool/UI.tsx b/packages/builtin-tools/src/tools/FileEditTool/UI.tsx
index 8a85a86e7..f00bb9bd7 100644
--- a/packages/builtin-tools/src/tools/FileEditTool/UI.tsx
+++ b/packages/builtin-tools/src/tools/FileEditTool/UI.tsx
@@ -20,7 +20,7 @@ import { readEditContext } from 'src/utils/readEditContext.js';
 import { firstLineOf } from 'src/utils/stringUtils.js';
 import type { ThemeName } from 'src/utils/theme.js';
 import type { FileEditOutput } from './types.js';
-import { findActualString, getPatchForEdit, preserveQuoteStyle } from './utils.js';
+import { findActualString, getPatchForEdit } from './utils.js';
 
 export function userFacingName(
   input:
@@ -265,12 +265,11 @@ async function loadRejectionDiff(
       return { patch, firstLine: null, fileContent: undefined };
     }
     const actualOld = findActualString(ctx.content, oldString) || oldString;
-    const actualNew = preserveQuoteStyle(oldString, actualOld, newString);
     const { patch } = getPatchForEdit({
       filePath,
       fileContents: ctx.content,
       oldString: actualOld,
-      newString: actualNew,
+      newString: newString,
       replaceAll,
     });
     return {
diff --git a/packages/builtin-tools/src/tools/FileEditTool/__tests__/utils.test.ts b/packages/builtin-tools/src/tools/FileEditTool/__tests__/utils.test.ts
index f7855798c..98f2c15d2 100644
--- a/packages/builtin-tools/src/tools/FileEditTool/__tests__/utils.test.ts
+++ b/packages/builtin-tools/src/tools/FileEditTool/__tests__/utils.test.ts
@@ -4,45 +4,8 @@ import { logMock } from '../../../../../../tests/mocks/log'
 // Mock log.ts to cut the heavy dependency chain
 mock.module('src/utils/log.ts', logMock)
 
-const {
-  normalizeQuotes,
-  stripTrailingWhitespace,
-  findActualString,
-  preserveQuoteStyle,
-  applyEditToFile,
-  LEFT_SINGLE_CURLY_QUOTE,
-  RIGHT_SINGLE_CURLY_QUOTE,
-  LEFT_DOUBLE_CURLY_QUOTE,
-  RIGHT_DOUBLE_CURLY_QUOTE,
-} = await import('../utils')
-
-// ─── normalizeQuotes ────────────────────────────────────────────────────
-
-describe('normalizeQuotes', () => {
-  test('converts left single curly to straight', () => {
-    expect(normalizeQuotes(`${LEFT_SINGLE_CURLY_QUOTE}hello`)).toBe("'hello")
-  })
-
-  test('converts right single curly to straight', () => {
-    expect(normalizeQuotes(`hello${RIGHT_SINGLE_CURLY_QUOTE}`)).toBe("hello'")
-  })
-
-  test('converts left double curly to straight', () => {
-    expect(normalizeQuotes(`${LEFT_DOUBLE_CURLY_QUOTE}hello`)).toBe('"hello')
-  })
-
-  test('converts right double curly to straight', () => {
-    expect(normalizeQuotes(`hello${RIGHT_DOUBLE_CURLY_QUOTE}`)).toBe('hello"')
-  })
-
-  test('leaves straight quotes unchanged', () => {
-    expect(normalizeQuotes('\'hello\' "world"')).toBe('\'hello\' "world"')
-  })
-
-  test('handles empty string', () => {
-    expect(normalizeQuotes('')).toBe('')
-  })
-})
+const { stripTrailingWhitespace, findActualString, applyEditToFile } =
+  await import('../utils')
 
 // ─── stripTrailingWhitespace ────────────────────────────────────────────
 
@@ -91,12 +54,6 @@ describe('findActualString', () => {
     expect(findActualString('hello world', 'hello')).toBe('hello')
   })
 
-  test('finds match with curly quotes normalized', () => {
-    const fileContent = `${LEFT_DOUBLE_CURLY_QUOTE}hello${RIGHT_DOUBLE_CURLY_QUOTE}`
-    const result = findActualString(fileContent, '"hello"')
-    expect(result).not.toBeNull()
-  })
-
   test('returns null when not found', () => {
     expect(findActualString('hello world', 'xyz')).toBeNull()
   })
@@ -107,124 +64,13 @@ describe('findActualString', () => {
     expect(result).toBe('')
   })
 
-  // ── Tab/space normalization (Bug #2 reproduction) ──
-
-  test('finds match when search uses spaces but file uses tabs', () => {
-    // File content uses Tab indentation
-    const fileContent = '\tif (x) {\n\t\treturn 1;\n\t}'
-    // User copies from Read output which renders tabs as spaces
-    const searchWithSpaces = '    if (x) {\n        return 1;\n    }'
-    const result = findActualString(fileContent, searchWithSpaces)
-    expect(result).not.toBeNull()
-    expect(result).toBe(fileContent)
-  })
-
-  test('finds match when search mixes tabs and spaces inconsistently', () => {
-    const fileContent = '\tconst x = 1; // comment'
-    const searchMixed = '    const x = 1; // comment'
-    const result = findActualString(fileContent, searchMixed)
-    expect(result).not.toBeNull()
-  })
-
-  test('finds match for single-line tab-to-space mismatch', () => {
-    const fileContent = '\t\torder_price = NormalizeDouble(ask, digits);'
-    const searchSpaces = '        order_price = NormalizeDouble(ask, digits);'
-    const result = findActualString(fileContent, searchSpaces)
-    expect(result).not.toBeNull()
-  })
-
-  // ── CJK / UTF-8 characters (Bug #1 reproduction) ──
+  // ── CJK / UTF-8 characters ──
 
   test('finds match with CJK characters in content', () => {
     const fileContent = 'input int x = 620; // 止盈点数(点) — 32个pip=320点'
     const result = findActualString(fileContent, fileContent)
     expect(result).toBe(fileContent)
   })
-
-  test('finds match with CJK characters when tab/space differs', () => {
-    const fileContent = '\t// 向上突破 → Sell Limit (逆方向做空)'
-    const searchSpaces = '    // 向上突破 → Sell Limit (逆方向做空)'
-    const result = findActualString(fileContent, searchSpaces)
-    expect(result).not.toBeNull()
-    expect(result).toBe(fileContent)
-  })
-
-  // ── Multiline with tabs + CJK (combined Bug #1 + #2) ──
-
-  test('finds multiline match with tabs and CJK characters', () => {
-    const fileContent =
-      '\tif(effective_dir == BREAKOUT_UP)\n\t\t{\n\t\t\t// 向上突破\n\t\t}'
-    const searchSpaces =
-      '    if(effective_dir == BREAKOUT_UP)\n        {\n            // 向上突破\n        }'
-    const result = findActualString(fileContent, searchSpaces)
-    expect(result).not.toBeNull()
-    expect(result).toBe(fileContent)
-  })
-
-  // ── Returned string must be a valid substring of fileContent ──
-
-  test('returned string from tab match is a real substring of fileContent', () => {
-    const fileContent = 'prefix\n\t\tindented code\nsuffix'
-    const searchSpaces = 'prefix\n        indented code\nsuffix'
-    const result = findActualString(fileContent, searchSpaces)
-    expect(result).not.toBeNull()
-    expect(fileContent.includes(result!)).toBe(true)
-  })
-
-  test('returned string from partial tab match is a real substring', () => {
-    const fileContent = 'line1\n\tif (x) {\n\t\tdoStuff();\n\t}\nline5'
-    const searchSpaces = '    if (x) {\n        doStuff();\n    }'
-    const result = findActualString(fileContent, searchSpaces)
-    expect(result).not.toBeNull()
-    expect(fileContent.includes(result!)).toBe(true)
-  })
-
-  test('tab match with mixed indentation levels', () => {
-    const fileContent =
-      'class Foo {\n\t\tmethod1() {\n\t\t\treturn 42;\n\t\t}\n}'
-    const searchSpaces =
-      'class Foo {\n        method1() {\n            return 42;\n        }\n}'
-    const result = findActualString(fileContent, searchSpaces)
-    expect(result).not.toBeNull()
-    expect(fileContent.includes(result!)).toBe(true)
-  })
-})
-
-// ─── preserveQuoteStyle ─────────────────────────────────────────────────
-
-describe('preserveQuoteStyle', () => {
-  test('returns newString unchanged when no normalization happened', () => {
-    expect(preserveQuoteStyle('hello', 'hello', 'world')).toBe('world')
-  })
-
-  test('converts straight double quotes to curly in replacement', () => {
-    const oldString = '"hello"'
-    const actualOldString = `${LEFT_DOUBLE_CURLY_QUOTE}hello${RIGHT_DOUBLE_CURLY_QUOTE}`
-    const newString = '"world"'
-    const result = preserveQuoteStyle(oldString, actualOldString, newString)
-    expect(result).toContain(LEFT_DOUBLE_CURLY_QUOTE)
-    expect(result).toContain(RIGHT_DOUBLE_CURLY_QUOTE)
-  })
-
-  test('converts straight single quotes to curly in replacement', () => {
-    const oldString = "'hello'"
-    const actualOldString = `${LEFT_SINGLE_CURLY_QUOTE}hello${RIGHT_SINGLE_CURLY_QUOTE}`
-    const newString = "'world'"
-    const result = preserveQuoteStyle(oldString, actualOldString, newString)
-    expect(result).toContain(LEFT_SINGLE_CURLY_QUOTE)
-    expect(result).toContain(RIGHT_SINGLE_CURLY_QUOTE)
-  })
-
-  test('treats apostrophe in contraction as right curly quote', () => {
-    const oldString = "'it's a test'"
-    const actualOldString = `${LEFT_SINGLE_CURLY_QUOTE}it${RIGHT_SINGLE_CURLY_QUOTE}s a test${RIGHT_SINGLE_CURLY_QUOTE}`
-    const newString = "'don't worry'"
-    const result = preserveQuoteStyle(oldString, actualOldString, newString)
-    // The leading ' at position 0 should be LEFT_SINGLE_CURLY_QUOTE
-    expect(result[0]).toBe(LEFT_SINGLE_CURLY_QUOTE)
-    // The apostrophe in "don't" (between n and t) should be RIGHT_SINGLE_CURLY_QUOTE
-    expect(result).toContain(RIGHT_SINGLE_CURLY_QUOTE)
-  })
 })
 
 // ─── applyEditToFile ────────────────────────────────────────────────────
diff --git a/packages/builtin-tools/src/tools/FileEditTool/utils.ts b/packages/builtin-tools/src/tools/FileEditTool/utils.ts
index 65ab58b05..6f9c37787 100644
--- a/packages/builtin-tools/src/tools/FileEditTool/utils.ts
+++ b/packages/builtin-tools/src/tools/FileEditTool/utils.ts
@@ -15,27 +15,6 @@ import {
 } from 'src/utils/file.js'
 import type { EditInput, FileEdit } from './types.js'
 
-// Claude can't output curly quotes, so we define them as constants here for Claude to use
-// in the code. We do this because we normalize curly quotes to straight quotes
-// when applying edits.
-export const LEFT_SINGLE_CURLY_QUOTE = '‘'
-export const RIGHT_SINGLE_CURLY_QUOTE = '’'
-export const LEFT_DOUBLE_CURLY_QUOTE = '“'
-export const RIGHT_DOUBLE_CURLY_QUOTE = '”'
-
-/**
- * Normalizes quotes in a string by converting curly quotes to straight quotes
- * @param str The string to normalize
- * @returns The string with all curly quotes replaced by straight quotes
- */
-export function normalizeQuotes(str: string): string {
-  return str
-    .replaceAll(LEFT_SINGLE_CURLY_QUOTE, "'")
-    .replaceAll(RIGHT_SINGLE_CURLY_QUOTE, "'")
-    .replaceAll(LEFT_DOUBLE_CURLY_QUOTE, '"')
-    .replaceAll(RIGHT_DOUBLE_CURLY_QUOTE, '"')
-}
-
 /**
  * Strips trailing whitespace from each line in a string while preserving line endings
  * @param str The string to process
@@ -64,261 +43,22 @@ export function stripTrailingWhitespace(str: string): string {
 }
 
 /**
- * Normalizes whitespace for fuzzy matching by converting tabs to spaces
- * and collapsing leading whitespace on each line to a canonical form.
- * This handles the case where Read tool output renders tabs as spaces,
- * so users copy spaces from the output but the file actually has tabs.
- */
-function normalizeWhitespace(str: string): string {
-  return str.replace(/\t/g, '    ')
-}
-
-/**
- * Finds the actual string in the file content that matches the search string,
- * accounting for quote normalization and tab/space differences.
- *
- * Matching cascade:
- * 1. Exact match
- * 2. Quote normalization (curly → straight quotes)
- * 3. Tab/space normalization (tabs ↔ spaces in leading whitespace)
- * 4. Quote + tab/space normalization combined
+ * Finds the exact string in the file content.
  *
  * @param fileContent The file content to search in
  * @param searchString The string to search for
- * @returns The actual string found in the file, or null if not found
+ * @returns The search string if found, or null if not found
  */
 export function findActualString(
   fileContent: string,
   searchString: string,
 ): string | null {
-  // First try exact match
   if (fileContent.includes(searchString)) {
     return searchString
   }
-
-  // Try with normalized quotes
-  const normalizedSearch = normalizeQuotes(searchString)
-  const normalizedFile = normalizeQuotes(fileContent)
-
-  const searchIndex = normalizedFile.indexOf(normalizedSearch)
-  if (searchIndex !== -1) {
-    // Find the actual string in the file that matches
-    return fileContent.substring(searchIndex, searchIndex + searchString.length)
-  }
-
-  // Try with tab/space normalization — handles the case where Read output
-  // renders tabs as spaces and the user copies the rendered version
-  const wsNormalizedFile = normalizeWhitespace(fileContent)
-  const wsNormalizedSearch = normalizeWhitespace(searchString)
-
-  const wsSearchIndex = wsNormalizedFile.indexOf(wsNormalizedSearch)
-  if (wsSearchIndex !== -1) {
-    // Map the match position back to the original file content.
-    // We need to find the corresponding range in the original string.
-    return mapNormalizedMatchBackToFile(
-      fileContent,
-      wsNormalizedFile,
-      wsSearchIndex,
-      wsNormalizedSearch.length,
-    )
-  }
-
-  // Try combined: quote normalization + tab/space normalization
-  const combinedFile = normalizeWhitespace(normalizedFile)
-  const combinedSearch = normalizeWhitespace(normalizedSearch)
-
-  const combinedIndex = combinedFile.indexOf(combinedSearch)
-  if (combinedIndex !== -1) {
-    return mapNormalizedMatchBackToFile(
-      fileContent,
-      combinedFile,
-      combinedIndex,
-      combinedSearch.length,
-    )
-  }
-
   return null
 }
 
-/**
- * Given a match found in a normalized version of fileContent, map the match
- * position back to the original fileContent and extract the corresponding
- * substring.
- *
- * Strategy: walk through both strings character by character, building a
- * mapping from normalized offset to original offset. When a tab is expanded
- * to 4 spaces in the normalized version, the normalized offset advances by 4
- * while the original offset advances by 1.
- */
-function mapNormalizedMatchBackToFile(
-  fileContent: string,
-  normalizedFile: string,
-  normalizedStart: number,
-  normalizedLength: number,
-): string {
-  // Build a sparse mapping from normalized position → original position.
-  // We only need to map the range [normalizedStart, normalizedStart + normalizedLength].
-  let normPos = 0
-  let origPos = 0
-  let origStart = -1
-  let origEnd = -1
-
-  while (
-    origPos < fileContent.length &&
-    normPos <= normalizedStart + normalizedLength
-  ) {
-    if (normPos === normalizedStart) {
-      origStart = origPos
-    }
-    if (normPos === normalizedStart + normalizedLength) {
-      origEnd = origPos
-      break
-    }
-
-    const origChar = fileContent[origPos]!
-    if (origChar === '\t') {
-      // Tab expands to 4 spaces in normalized version
-      const nextNormPos = normPos + 4
-      // If normalizedStart falls within this expanded tab, snap to origPos
-      if (
-        normPos < normalizedStart &&
-        nextNormPos > normalizedStart &&
-        origStart === -1
-      ) {
-        origStart = origPos
-      }
-      if (
-        normPos < normalizedStart + normalizedLength &&
-        nextNormPos > normalizedStart + normalizedLength &&
-        origEnd === -1
-      ) {
-        origEnd = origPos + 1
-      }
-      normPos = nextNormPos
-      origPos++
-    } else {
-      normPos++
-      origPos++
-    }
-  }
-
-  // Fallback: if we couldn't map precisely, use character-count heuristic
-  if (origStart === -1) origStart = 0
-  if (origEnd === -1) {
-    // Approximate: use the ratio of original to normalized length
-    const ratio = fileContent.length / normalizedFile.length
-    origEnd = Math.round(origStart + normalizedLength * ratio)
-  }
-
-  return fileContent.substring(origStart, origEnd)
-}
-
-/**
- * When old_string matched via quote normalization (curly quotes in file,
- * straight quotes from model), apply the same curly quote style to new_string
- * so the edit preserves the file's typography.
- *
- * Uses a simple open/close heuristic: a quote character preceded by whitespace,
- * start of string, or opening punctuation is treated as an opening quote;
- * otherwise it's a closing quote.
- */
-export function preserveQuoteStyle(
-  oldString: string,
-  actualOldString: string,
-  newString: string,
-): string {
-  // If they're the same, no normalization happened
-  if (oldString === actualOldString) {
-    return newString
-  }
-
-  // Detect which curly quote types were in the file
-  const hasDoubleQuotes =
-    actualOldString.includes(LEFT_DOUBLE_CURLY_QUOTE) ||
-    actualOldString.includes(RIGHT_DOUBLE_CURLY_QUOTE)
-  const hasSingleQuotes =
-    actualOldString.includes(LEFT_SINGLE_CURLY_QUOTE) ||
-    actualOldString.includes(RIGHT_SINGLE_CURLY_QUOTE)
-
-  if (!hasDoubleQuotes && !hasSingleQuotes) {
-    return newString
-  }
-
-  let result = newString
-
-  if (hasDoubleQuotes) {
-    result = applyCurlyDoubleQuotes(result)
-  }
-  if (hasSingleQuotes) {
-    result = applyCurlySingleQuotes(result)
-  }
-
-  return result
-}
-
-function isOpeningContext(chars: string[], index: number): boolean {
-  if (index === 0) {
-    return true
-  }
-  const prev = chars[index - 1]
-  return (
-    prev === ' ' ||
-    prev === '\t' ||
-    prev === '\n' ||
-    prev === '\r' ||
-    prev === '(' ||
-    prev === '[' ||
-    prev === '{' ||
-    prev === '\u2014' || // em dash
-    prev === '\u2013' // en dash
-  )
-}
-
-function applyCurlyDoubleQuotes(str: string): string {
-  const chars = [...str]
-  const result: string[] = []
-  for (let i = 0; i < chars.length; i++) {
-    if (chars[i] === '"') {
-      result.push(
-        isOpeningContext(chars, i)
-          ? LEFT_DOUBLE_CURLY_QUOTE
-          : RIGHT_DOUBLE_CURLY_QUOTE,
-      )
-    } else {
-      result.push(chars[i]!)
-    }
-  }
-  return result.join('')
-}
-
-function applyCurlySingleQuotes(str: string): string {
-  const chars = [...str]
-  const result: string[] = []
-  for (let i = 0; i < chars.length; i++) {
-    if (chars[i] === "'") {
-      // Don't convert apostrophes in contractions (e.g., "don't", "it's")
-      // An apostrophe between two letters is a contraction, not a quote
-      const prev = i > 0 ? chars[i - 1] : undefined
-      const next = i < chars.length - 1 ? chars[i + 1] : undefined
-      const prevIsLetter = prev !== undefined && /\p{L}/u.test(prev)
-      const nextIsLetter = next !== undefined && /\p{L}/u.test(next)
-      if (prevIsLetter && nextIsLetter) {
-        // Apostrophe in a contraction — use right single curly quote
-        result.push(RIGHT_SINGLE_CURLY_QUOTE)
-      } else {
-        result.push(
-          isOpeningContext(chars, i)
-            ? LEFT_SINGLE_CURLY_QUOTE
-            : RIGHT_SINGLE_CURLY_QUOTE,
-        )
-      }
-    } else {
-      result.push(chars[i]!)
-    }
-  }
-  return result.join('')
-}
-
 /**
  * Transform edits to ensure replace_all always has a boolean value
  * @param edits Array of edits with optional replace_all
diff --git a/src/components/FileEditToolDiff.tsx b/src/components/FileEditToolDiff.tsx
index 71acf4338..f8ca04a0f 100644
--- a/src/components/FileEditToolDiff.tsx
+++ b/src/components/FileEditToolDiff.tsx
@@ -4,7 +4,7 @@ import { Suspense, use, useState } from 'react';
 import { useTerminalSize } from '../hooks/useTerminalSize.js';
 import { Box, Text } from '@anthropic/ink';
 import type { FileEdit } from '@claude-code-best/builtin-tools/tools/FileEditTool/types.js';
-import { findActualString, preserveQuoteStyle } from '@claude-code-best/builtin-tools/tools/FileEditTool/utils.js';
+import { findActualString } from '@claude-code-best/builtin-tools/tools/FileEditTool/utils.js';
 import { adjustHunkLineNumbers, CONTEXT_LINES, getPatchForDisplay } from '../utils/diff.js';
 import { logError } from '../utils/log.js';
 import { CHUNK_SIZE, openForScan, readCapped, scanForContext } from '../utils/readEditContext.js';
@@ -135,6 +135,5 @@ function diffToolInputsOnly(filePath: string, edits: FileEdit[]): DiffData {
 
 function normalizeEdit(fileContent: string, edit: FileEdit): FileEdit {
   const actualOld = findActualString(fileContent, edit.old_string) || edit.old_string;
-  const actualNew = preserveQuoteStyle(edit.old_string, actualOld, edit.new_string);
-  return { ...edit, old_string: actualOld, new_string: actualNew };
+  return { ...edit, old_string: actualOld };
 }