diff --git a/config/scripts/ci-unit-files.mjs b/config/scripts/ci-unit-files.mjs
index d2688470c4b..8802da83ed6 100644
--- a/config/scripts/ci-unit-files.mjs
+++ b/config/scripts/ci-unit-files.mjs
@@ -19,6 +19,7 @@ export const UNIT_SETUP_FILES = [
   'config/scripts/vitest-dom-setup.ts',
   'config/scripts/vitest-host-ports-setup.ts',
   'config/scripts/vitest-caller-identity-env-setup.ts',
+  'config/scripts/vitest-inherited-git-env-setup.ts',
   'config/scripts/vitest-orcad-feature-readiness-reset.ts'
 ]
 
diff --git a/config/scripts/vitest-inherited-git-env-setup.ts b/config/scripts/vitest-inherited-git-env-setup.ts
new file mode 100644
index 00000000000..6f42b4a1273
--- /dev/null
+++ b/config/scripts/vitest-inherited-git-env-setup.ts
@@ -0,0 +1,14 @@
+// A hook's repo-locating Git env would aim real-Git suites at the outer repo; keep GIT_EXEC_PATH and config, which the compat lane sets.
+for (const name of [
+  'GIT_DIR',
+  'GIT_WORK_TREE',
+  'GIT_INDEX_FILE',
+  'GIT_COMMON_DIR',
+  'GIT_OBJECT_DIRECTORY',
+  'GIT_ALTERNATE_OBJECT_DIRECTORIES',
+  'GIT_NAMESPACE',
+  'GIT_PREFIX',
+  'GIT_QUARANTINE_PATH'
+]) {
+  delete process.env[name]
+}
diff --git a/config/tsconfig.node.json b/config/tsconfig.node.json
index 061c6f89f81..cd833e90c0a 100644
--- a/config/tsconfig.node.json
+++ b/config/tsconfig.node.json
@@ -6,6 +6,7 @@
     "./build-plugins/**/*",
     "./scripts/vitest-host-ports-setup.ts",
     "./scripts/vitest-caller-identity-env-setup.ts",
+    "./scripts/vitest-inherited-git-env-setup.ts",
     "./scripts/vitest-real-agent-home-write-guard.ts",
     "./scripts/vitest-bun-node-builtins.ts",
     "./scripts/vitest-dom-setup.ts",