diff --git a/.claude/hooks/track-edits.sh b/.claude/hooks/track-edits.sh
index 758db1328..f73652e8f 100644
--- a/.claude/hooks/track-edits.sh
+++ b/.claude/hooks/track-edits.sh
@@ -23,8 +23,27 @@ if [ -z "$FILE_PATH" ]; then
   exit 0
 fi
 
-# Use git worktree root so each worktree session has its own edit log
-PROJECT_DIR=$(git rev-parse --show-toplevel 2>/dev/null) || PROJECT_DIR="${CLAUDE_PROJECT_DIR:-.}"
+# Resolve the git worktree that actually owns the edited file, rather than
+# the hook process's own ambient cwd. Edit/Write tool calls carry only an
+# absolute file_path with no associated "current directory" state, so the
+# hook's ambient cwd is not guaranteed to match the worktree the file lives
+# in (see issue #1838) — this mirrors the `-C "$WORK_DIR"` pattern
+# guard-git.sh already uses on the read side of this same check.
+#
+# Walk up to the nearest existing ancestor directory first: Write can target
+# a not-yet-created nested directory, and `git -C` requires an existing path.
+SEARCH_DIR=$(dirname -- "$FILE_PATH")
+while [ ! -d "$SEARCH_DIR" ] && [ "$SEARCH_DIR" != "/" ] && [ -n "$SEARCH_DIR" ]; do
+  SEARCH_DIR=$(dirname -- "$SEARCH_DIR")
+done
+
+PROJECT_DIR=""
+if [ -n "$SEARCH_DIR" ] && [ -d "$SEARCH_DIR" ]; then
+  PROJECT_DIR=$(git -C "$SEARCH_DIR" rev-parse --show-toplevel 2>/dev/null) || true
+fi
+if [ -z "$PROJECT_DIR" ]; then
+  PROJECT_DIR=$(git rev-parse --show-toplevel 2>/dev/null) || PROJECT_DIR="${CLAUDE_PROJECT_DIR:-.}"
+fi
 LOG_FILE="$PROJECT_DIR/.claude/session-edits.log"
 
 # Normalize to relative path with forward slashes
diff --git a/docs/examples/claude-code-hooks/track-edits.sh b/docs/examples/claude-code-hooks/track-edits.sh
index 758db1328..f73652e8f 100644
--- a/docs/examples/claude-code-hooks/track-edits.sh
+++ b/docs/examples/claude-code-hooks/track-edits.sh
@@ -23,8 +23,27 @@ if [ -z "$FILE_PATH" ]; then
   exit 0
 fi
 
-# Use git worktree root so each worktree session has its own edit log
-PROJECT_DIR=$(git rev-parse --show-toplevel 2>/dev/null) || PROJECT_DIR="${CLAUDE_PROJECT_DIR:-.}"
+# Resolve the git worktree that actually owns the edited file, rather than
+# the hook process's own ambient cwd. Edit/Write tool calls carry only an
+# absolute file_path with no associated "current directory" state, so the
+# hook's ambient cwd is not guaranteed to match the worktree the file lives
+# in (see issue #1838) — this mirrors the `-C "$WORK_DIR"` pattern
+# guard-git.sh already uses on the read side of this same check.
+#
+# Walk up to the nearest existing ancestor directory first: Write can target
+# a not-yet-created nested directory, and `git -C` requires an existing path.
+SEARCH_DIR=$(dirname -- "$FILE_PATH")
+while [ ! -d "$SEARCH_DIR" ] && [ "$SEARCH_DIR" != "/" ] && [ -n "$SEARCH_DIR" ]; do
+  SEARCH_DIR=$(dirname -- "$SEARCH_DIR")
+done
+
+PROJECT_DIR=""
+if [ -n "$SEARCH_DIR" ] && [ -d "$SEARCH_DIR" ]; then
+  PROJECT_DIR=$(git -C "$SEARCH_DIR" rev-parse --show-toplevel 2>/dev/null) || true
+fi
+if [ -z "$PROJECT_DIR" ]; then
+  PROJECT_DIR=$(git rev-parse --show-toplevel 2>/dev/null) || PROJECT_DIR="${CLAUDE_PROJECT_DIR:-.}"
+fi
 LOG_FILE="$PROJECT_DIR/.claude/session-edits.log"
 
 # Normalize to relative path with forward slashes
diff --git a/tests/unit/hook-track-edits-worktree.test.ts b/tests/unit/hook-track-edits-worktree.test.ts
new file mode 100644
index 000000000..1be1b7ff2
--- /dev/null
+++ b/tests/unit/hook-track-edits-worktree.test.ts
@@ -0,0 +1,88 @@
+/**
+ * Regression guard for issue #1838: .claude/hooks/track-edits.sh (PostToolUse
+ * hook for Edit/Write) resolved PROJECT_DIR from the hook process's own
+ * ambient cwd (`git rev-parse --show-toplevel` with no `-C`). Edit/Write tool
+ * calls carry only an absolute `file_path` with no associated "current
+ * directory" state, so the hook's ambient cwd is not guaranteed to match the
+ * worktree that actually owns the edited file — especially in worktree
+ * sessions where the ambient cwd can lag behind interleaved Bash `cd` calls.
+ * When it doesn't match, the log entry lands in the wrong worktree's
+ * `.claude/session-edits.log` (or is silently dropped as a `..`-relative
+ * path), and guard-git.sh later blocks a legitimate commit claiming the file
+ * was "NOT edited in this session".
+ *
+ * The fix derives PROJECT_DIR from the edited file's own path
+ * (`git -C "<dir containing file_path>" rev-parse --show-toplevel`) instead
+ * of the ambient cwd — mirroring the `-C "$WORK_DIR"` pattern guard-git.sh
+ * already uses on the read side of this same check.
+ */
+import { execFileSync } from 'node:child_process';
+import fs from 'node:fs';
+import os from 'node:os';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { afterEach, beforeEach, describe, expect, it } from 'vitest';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const REPO_ROOT = path.resolve(__dirname, '..', '..');
+const HOOK_PATH = path.join(REPO_ROOT, '.claude', 'hooks', 'track-edits.sh');
+
+function initRepo(dir: string): void {
+  fs.mkdirSync(dir, { recursive: true });
+  execFileSync('git', ['init', '-q'], { cwd: dir });
+  execFileSync('git', ['config', 'user.email', 'test@example.com'], { cwd: dir });
+  execFileSync('git', ['config', 'user.name', 'Test'], { cwd: dir });
+}
+
+function runHook(filePath: string, cwd: string): void {
+  const toolInput = JSON.stringify({ tool_input: { file_path: filePath } });
+  execFileSync('bash', [HOOK_PATH], { cwd, input: toolInput });
+}
+
+describe("track-edits.sh resolves the log to the edited file's own worktree", () => {
+  let tmpRoot: string;
+
+  beforeEach(() => {
+    tmpRoot = fs.realpathSync(fs.mkdtempSync(path.join(os.tmpdir(), 'track-edits-test-')));
+  });
+
+  afterEach(() => {
+    fs.rmSync(tmpRoot, { recursive: true, force: true });
+  });
+
+  it('logs to the target worktree even when the hook process cwd is a different worktree', () => {
+    const ambientRepo = path.join(tmpRoot, 'ambient-repo');
+    const targetRepo = path.join(tmpRoot, 'target-worktree');
+    initRepo(ambientRepo);
+    initRepo(targetRepo);
+
+    const targetFile = path.join(targetRepo, 'src', 'thing.ts');
+    fs.mkdirSync(path.dirname(targetFile), { recursive: true });
+    fs.writeFileSync(targetFile, '// content\n');
+
+    // The hook process's ambient cwd is a DIFFERENT git worktree than the one
+    // that owns the edited file — this is the racy condition from #1838.
+    runHook(targetFile, ambientRepo);
+
+    const targetLog = path.join(targetRepo, '.claude', 'session-edits.log');
+    const ambientLog = path.join(ambientRepo, '.claude', 'session-edits.log');
+
+    expect(fs.existsSync(targetLog)).toBe(true);
+    expect(fs.readFileSync(targetLog, 'utf8')).toMatch(/ src\/thing\.ts$/m);
+    expect(fs.existsSync(ambientLog)).toBe(false);
+  });
+
+  it('walks up to the nearest existing ancestor when Write targets a not-yet-created nested directory', () => {
+    const targetRepo = path.join(tmpRoot, 'target-worktree-2');
+    initRepo(targetRepo);
+    // a/b/c does not exist yet — simulates the Write tool creating new nested dirs.
+    const nestedFile = path.join(targetRepo, 'a', 'b', 'c', 'new-file.ts');
+
+    // Ambient cwd is entirely outside any git repo.
+    runHook(nestedFile, tmpRoot);
+
+    const targetLog = path.join(targetRepo, '.claude', 'session-edits.log');
+    expect(fs.existsSync(targetLog)).toBe(true);
+    expect(fs.readFileSync(targetLog, 'utf8')).toMatch(/ a\/b\/c\/new-file\.ts$/m);
+  });
+});