diff --git a/scripts/check-no-conflict-markers.d.mts b/scripts/check-no-conflict-markers.d.mts
index ad1ceb752ca..984440cd201 100644
--- a/scripts/check-no-conflict-markers.d.mts
+++ b/scripts/check-no-conflict-markers.d.mts
@@ -2,30 +2,30 @@
 /**
  * Returns one-based line numbers containing merge conflict markers.
  */
-export function findConflictMarkerLines(content: unknown): unknown[];
+export function findConflictMarkerLines(content: string): number[];
 /**
- * Lists tracked files in the repository.
- */
-export function listTrackedFiles(cwd?: string): string[];
-/**
- * Scans files for merge conflict markers, skipping binary content.
+ * Scans a list of files for merge conflict markers, skipping binary content.
+ * Intended for direct/small-scale use; the tracked-files path uses git grep
+ * directly to avoid reading large files into memory.
  */
 export function findConflictMarkersInFiles(
-  filePaths: unknown,
-  readFile?: typeof fs.readFileSync,
+  filePaths: string[],
+  readFile?: (path: string) => string | Buffer,
 ): {
-  filePath: unknown;
-  lines: unknown[];
+  filePath: string;
+  lines: number[];
 }[];
 /**
- * Finds merge conflict markers in tracked repository files.
+ * Uses git grep to find exact conflict-marker matches in tracked files.
  */
-export function findConflictMarkersInTrackedFiles(cwd?: string): {
-  filePath: unknown;
-  lines: unknown[];
+export function findConflictMarkersInTrackedFiles(
+  cwd?: string,
+  run?: typeof import("node:child_process").spawnSync,
+): {
+  filePath: string;
+  lines: number[];
 }[];
 /**
  * Runs the merge conflict marker check.
  */
 export function main(): Promise<void>;
-import fs from "node:fs";
diff --git a/scripts/check-no-conflict-markers.mjs b/scripts/check-no-conflict-markers.mjs
index 807cc6cd6eb..2c9bf136293 100644
--- a/scripts/check-no-conflict-markers.mjs
+++ b/scripts/check-no-conflict-markers.mjs
@@ -1,7 +1,7 @@
 #!/usr/bin/env node
 
 // Rejects unresolved merge conflict markers in tracked files.
-import { execFileSync, spawnSync } from "node:child_process";
+import { spawnSync } from "node:child_process";
 import fs from "node:fs";
 import path from "node:path";
 import { fileURLToPath } from "node:url";
@@ -32,21 +32,9 @@ export function findConflictMarkerLines(content) {
 }
 
 /**
- * Lists tracked files in the repository.
- */
-export function listTrackedFiles(cwd = process.cwd()) {
-  const output = execFileSync("git", ["ls-files", "-z"], {
-    cwd,
-    encoding: "utf8",
-  });
-  return output
-    .split("\0")
-    .filter(Boolean)
-    .map((relativePath) => path.join(cwd, relativePath));
-}
-
-/**
- * Scans files for merge conflict markers, skipping binary content.
+ * Scans a list of files for merge conflict markers, skipping binary content.
+ * This is kept for direct, small-scale use (tests); the tracked-files path
+ * uses git grep directly to avoid reading large files into memory.
  */
 export function findConflictMarkersInFiles(filePaths, readFile = fs.readFileSync) {
   const violations = [];
@@ -75,12 +63,66 @@ export function findConflictMarkersInFiles(filePaths, readFile = fs.readFileSync
 }
 
 /**
- * Uses git grep to list tracked files that may contain conflict markers.
+ * Parses output from `git grep -n -z -o -I -E` into violation records.
+ * The record format is:
+ *   path\0line-number\0match-text\n
+ * The path must be read from its NUL delimiter before any newline-based
+ * record splitting: -z reports paths verbatim, and git allows newlines in
+ * tracked filenames, so splitting the output on newlines first would cut a
+ * newline-containing path across two records and silently mangle it.
+ * Keeping parsing to exact grep match records avoids reading candidate files
+ * whole and keeps memory bounded regardless of file size.
  */
-function listTrackedFilesWithConflictMarkerCandidates(cwd = process.cwd(), run = spawnSync) {
+function parseGitGrepConflictMarkerOutput(stdout) {
+  const byPath = new Map();
+  const output = stdout.toString("utf8");
+  let cursor = 0;
+
+  while (cursor < output.length) {
+    const pathEnd = output.indexOf("\0", cursor);
+    if (pathEnd === -1) {
+      break;
+    }
+    const lineNumberEnd = output.indexOf("\0", pathEnd + 1);
+    if (lineNumberEnd === -1) {
+      break;
+    }
+    // With -o the match text is a single-line match, so the record ends at
+    // the next newline after the line-number field.
+    const matchEnd = output.indexOf("\n", lineNumberEnd + 1);
+    const relativePath = output.slice(cursor, pathEnd);
+    const lineNumber = Number(output.slice(pathEnd + 1, lineNumberEnd));
+    cursor = matchEnd === -1 ? output.length : matchEnd + 1;
+    if (!relativePath || !Number.isFinite(lineNumber) || lineNumber <= 0) {
+      continue;
+    }
+    const existing = byPath.get(relativePath);
+    if (existing) {
+      existing.push(lineNumber);
+    } else {
+      byPath.set(relativePath, [lineNumber]);
+    }
+  }
+
+  const violations = [];
+  for (const [relativePath, lineNumbers] of byPath) {
+    lineNumbers.sort((a, b) => a - b);
+    violations.push({
+      filePath: relativePath,
+      lines: lineNumbers,
+    });
+  }
+  violations.sort((a, b) => a.filePath.localeCompare(b.filePath));
+  return violations;
+}
+
+/**
+ * Uses git grep to find exact conflict-marker matches in tracked files.
+ */
+export function findConflictMarkersInTrackedFiles(cwd = process.cwd(), run = spawnSync) {
   const result = run(
     "git",
-    ["grep", "-l", "-z", "-I", "-E", CONFLICT_MARKER_GREP_PATTERN, "--", "."],
+    ["grep", "--no-color", "-n", "-z", "-o", "-I", "-E", CONFLICT_MARKER_GREP_PATTERN, "--", "."],
     {
       cwd,
       encoding: "buffer",
@@ -93,18 +135,7 @@ function listTrackedFilesWithConflictMarkerCandidates(cwd = process.cwd(), run =
     const stderr = result.stderr?.toString("utf8").trim();
     throw new Error(stderr || `git grep failed with status ${result.status ?? "unknown"}`);
   }
-  return result.stdout
-    .toString("utf8")
-    .split("\0")
-    .filter(Boolean)
-    .map((relativePath) => path.join(cwd, relativePath));
-}
-
-/**
- * Finds merge conflict markers in tracked repository files.
- */
-export function findConflictMarkersInTrackedFiles(cwd = process.cwd()) {
-  return findConflictMarkersInFiles(listTrackedFilesWithConflictMarkerCandidates(cwd));
+  return parseGitGrepConflictMarkerOutput(result.stdout);
 }
 
 /**
@@ -119,8 +150,8 @@ export async function main() {
 
   console.error("Found unresolved merge conflict markers:");
   for (const violation of violations) {
-    const relativePath = path.relative(cwd, violation.filePath) || violation.filePath;
-    console.error(`- ${relativePath}:${violation.lines.join(",")}`);
+    // findConflictMarkersInTrackedFiles already returns paths relative to cwd.
+    console.error(`- ${violation.filePath}:${violation.lines.join(",")}`);
   }
   process.exitCode = 1;
 }
diff --git a/test/scripts/check-no-conflict-markers.test.ts b/test/scripts/check-no-conflict-markers.test.ts
index dcd8b6ff234..f950a9a5a53 100644
--- a/test/scripts/check-no-conflict-markers.test.ts
+++ b/test/scripts/check-no-conflict-markers.test.ts
@@ -7,7 +7,6 @@ import {
   findConflictMarkerLines,
   findConflictMarkersInFiles,
   findConflictMarkersInTrackedFiles,
-  listTrackedFiles,
 } from "../../scripts/check-no-conflict-markers.mjs";
 import { createScriptTestHarness } from "./test-helpers.js";
 
@@ -63,16 +62,17 @@ describe("check-no-conflict-markers", () => {
     ]);
   });
 
-  it("finds conflict markers in tracked script files", () => {
+  it("finds conflict markers in tracked files using git grep", () => {
     const rootDir = createTempDir("openclaw-conflict-markers-");
     git(rootDir, "init", "-q");
     git(rootDir, "config", "user.email", "test@example.com");
     git(rootDir, "config", "user.name", "Test User");
 
-    const scriptFile = path.join(rootDir, "scripts", "bundled-plugin-metadata-runtime.mjs");
-    fs.mkdirSync(path.dirname(scriptFile), { recursive: true });
+    const scriptFile = "scripts/bundled-plugin-metadata-runtime.mjs";
+    const scriptPath = path.join(rootDir, scriptFile);
+    fs.mkdirSync(path.dirname(scriptPath), { recursive: true });
     fs.writeFileSync(
-      scriptFile,
+      scriptPath,
       [
         "<<<<<<< HEAD",
         'const left = "left";',
@@ -81,14 +81,7 @@ describe("check-no-conflict-markers", () => {
         ">>>>>>> branch",
       ].join("\n"),
     );
-    git(rootDir, "add", "scripts/bundled-plugin-metadata-runtime.mjs");
-
-    expect(findConflictMarkersInFiles(listTrackedFiles(rootDir))).toEqual([
-      {
-        filePath: scriptFile,
-        lines: [1, 3, 5],
-      },
-    ]);
+    git(rootDir, "add", scriptFile);
 
     const violations = findConflictMarkersInTrackedFiles(rootDir);
 
@@ -99,4 +92,178 @@ describe("check-no-conflict-markers", () => {
       },
     ]);
   });
+
+  it("disables configured git grep colors before parsing records", () => {
+    const rootDir = createTempDir("openclaw-conflict-markers-");
+    git(rootDir, "init", "-q");
+    git(rootDir, "config", "user.email", "test@example.com");
+    git(rootDir, "config", "user.name", "Test User");
+    git(rootDir, "config", "color.grep", "always");
+    git(rootDir, "config", "color.grep.lineNumber", "red");
+
+    const conflictFile = "src/conflict.ts";
+    const conflictPath = path.join(rootDir, conflictFile);
+    fs.mkdirSync(path.dirname(conflictPath), { recursive: true });
+    fs.writeFileSync(conflictPath, "<<<<<<< HEAD\nleft\n=======\nright\n>>>>>>> branch\n");
+    git(rootDir, "add", conflictFile);
+
+    expect(findConflictMarkersInTrackedFiles(rootDir)).toEqual([
+      {
+        filePath: conflictFile,
+        lines: [1, 3, 5],
+      },
+    ]);
+  });
+
+  it("returns no violations when tracked files have no conflict markers", () => {
+    const rootDir = createTempDir("openclaw-conflict-markers-");
+    git(rootDir, "init", "-q");
+    git(rootDir, "config", "user.email", "test@example.com");
+    git(rootDir, "config", "user.name", "Test User");
+
+    const cleanFile = "src/clean.ts";
+    const cleanPath = path.join(rootDir, cleanFile);
+    fs.mkdirSync(path.dirname(cleanPath), { recursive: true });
+    fs.writeFileSync(cleanPath, "const x = 1;\n");
+    git(rootDir, "add", cleanFile);
+
+    expect(findConflictMarkersInTrackedFiles(rootDir)).toEqual([]);
+  });
+
+  it("skips binary tracked files via git grep binary exclusion", () => {
+    const rootDir = createTempDir("openclaw-conflict-markers-");
+    git(rootDir, "init", "-q");
+    git(rootDir, "config", "user.email", "test@example.com");
+    git(rootDir, "config", "user.name", "Test User");
+
+    const binaryFile = "assets/image.png";
+    const binaryPath = path.join(rootDir, binaryFile);
+    fs.mkdirSync(path.dirname(binaryPath), { recursive: true });
+    // Marker-like bytes inside a binary file should not be reported because
+    // git grep -I skips binary files.
+    fs.writeFileSync(
+      binaryPath,
+      Buffer.from([0x3c, 0x3c, 0x3c, 0x3c, 0x3c, 0x3c, 0x3c, 0x20, 0x00]),
+    );
+    git(rootDir, "add", binaryFile);
+
+    expect(findConflictMarkersInTrackedFiles(rootDir)).toEqual([]);
+  });
+
+  it("handles tracked files with spaces and unusual characters in paths", () => {
+    const rootDir = createTempDir("openclaw-conflict-markers-");
+    git(rootDir, "init", "-q");
+    git(rootDir, "config", "user.email", "test@example.com");
+    git(rootDir, "config", "user.name", "Test User");
+
+    const weirdFile = "docs/weird name (v2).md";
+    const weirdPath = path.join(rootDir, weirdFile);
+    fs.mkdirSync(path.dirname(weirdPath), { recursive: true });
+    fs.writeFileSync(
+      weirdPath,
+      "before\n<<<<<<< HEAD\nleft\n=======\nright\n>>>>>>> branch\nafter\n",
+    );
+    git(rootDir, "add", weirdFile);
+
+    const violations = findConflictMarkersInTrackedFiles(rootDir);
+
+    expect(violations).toEqual([
+      {
+        filePath: weirdFile,
+        lines: [2, 4, 6],
+      },
+    ]);
+  });
+
+  it("reports tracked filenames containing newlines without mangling the path", () => {
+    const rootDir = createTempDir("openclaw-conflict-markers-");
+    git(rootDir, "init", "-q");
+    git(rootDir, "config", "user.email", "test@example.com");
+    git(rootDir, "config", "user.name", "Test User");
+
+    // git allows newlines in tracked filenames and git grep -z prints the
+    // path verbatim; the parser must read the NUL-delimited path before any
+    // newline-based record splitting or the path is silently truncated.
+    const newlineFile = "docs/weird\nname.md";
+    const newlinePath = path.join(rootDir, newlineFile);
+    fs.mkdirSync(path.dirname(newlinePath), { recursive: true });
+    fs.writeFileSync(
+      newlinePath,
+      "before\n<<<<<<< HEAD\nleft\n=======\nright\n>>>>>>> branch\nafter\n",
+    );
+    git(rootDir, "add", newlineFile);
+
+    const violations = findConflictMarkersInTrackedFiles(rootDir);
+
+    expect(violations).toEqual([
+      {
+        filePath: newlineFile,
+        lines: [2, 4, 6],
+      },
+    ]);
+  });
+
+  it("detects markers in a file larger than the previous scan byte limit without reading it whole", () => {
+    const rootDir = createTempDir("openclaw-conflict-markers-");
+    git(rootDir, "init", "-q");
+    git(rootDir, "config", "user.email", "test@example.com");
+    git(rootDir, "config", "user.name", "Test User");
+
+    const largeFile = "generated/large.txt";
+    const largePath = path.join(rootDir, largeFile);
+    fs.mkdirSync(path.dirname(largePath), { recursive: true });
+    // 10 MiB of filler with a marker near the end; git grep reports the line
+    // number without us buffering the entire file.
+    const filler = ("a".repeat(10240) + "\n").repeat(1024);
+    fs.writeFileSync(largePath, filler + "<<<<<<< HEAD\nleft\n=======\nright\n>>>>>>> branch\n");
+    git(rootDir, "add", largeFile);
+
+    const violations = findConflictMarkersInTrackedFiles(rootDir);
+
+    expect(violations).toEqual([
+      {
+        filePath: largeFile,
+        lines: [1025, 1027, 1029],
+      },
+    ]);
+  });
+
+  it("main reports tracked violations with paths relative to cwd", () => {
+    const rootDir = createTempDir("openclaw-conflict-markers-main-");
+    git(rootDir, "init", "-q");
+    git(rootDir, "config", "user.email", "test@example.com");
+    git(rootDir, "config", "user.name", "Test User");
+
+    const conflictFile = "src/conflict.ts";
+    const conflictPath = path.join(rootDir, conflictFile);
+    fs.mkdirSync(path.dirname(conflictPath), { recursive: true });
+    fs.writeFileSync(
+      conflictPath,
+      [
+        "<<<<<<< HEAD",
+        'const value = "left";',
+        "=======",
+        'const value = "right";',
+        ">>>>>>> branch",
+      ].join("\n"),
+    );
+    git(rootDir, "add", conflictFile);
+
+    const scriptPath = path.resolve(__dirname, "../../scripts/check-no-conflict-markers.mjs");
+    let error: Error | undefined;
+    try {
+      execFileSync(process.execPath, [scriptPath], {
+        cwd: rootDir,
+        encoding: "utf8",
+        stdio: ["ignore", "pipe", "pipe"],
+      });
+    } catch (caught) {
+      error = caught as Error;
+    }
+
+    expect(error).toBeDefined();
+    const stderr = (error as { stderr?: string }).stderr ?? "";
+    expect(stderr).toContain("Found unresolved merge conflict markers:");
+    expect(stderr).toContain(`- ${conflictFile}:1,3,5`);
+  });
 });