diff --git a/.lintrunner.toml b/.lintrunner.toml
index 75608704110..4289239e46c 100644
--- a/.lintrunner.toml
+++ b/.lintrunner.toml
@@ -109,16 +109,106 @@ is_formatter = true
 [[linter]]
 code = 'CPPCHECK'
 include_patterns = [
-    'backends/arm/**/*.cpp',
-    'backends/arm/**/*.h',
-    'backends/arm/**/*.hpp',
-    'backends/cortex_m/**/*.cpp',
-    'backends/cortex_m/**/*.h',
-    'examples/arm/**/*.cpp',
-    'examples/arm/**/*.h',
-    'examples/arm/**/*.hpp',
+    '**/*.cpp',
+    '**/*.h',
+    '**/*.hpp',
 ]
 exclude_patterns = [
+    # Third-party and vendored code.
+    'third-party/**',
+    'third_party/**',
+    '**/third-party/**',
+    '**/third_party/**',
+
+    # Mirrored sources under src/ (Python package layout). Prefer linting canonical paths.
+    'src/executorch/**',
+    # PyTorch compatibility code kept in sync with upstream.
+    'runtime/core/portable_type/c10/**',
+
+    # Generated sources, templates, and codegen tooling to onboard separately.
+    'codegen/templates/**',
+    'codegen/tools/selective_build.cpp',
+    'exir/_serialize/**',
+
+    # Backend-owned code to onboard separately.
+    'backends/aoti/**',
+    'backends/apple/**',
+    'backends/cadence/**',
+    'backends/cuda/**',
+    'backends/mediatek/**',
+    'backends/mlx/**',
+    'backends/nxp/**',
+    'backends/openvino/**',
+    'backends/qualcomm/**',
+    'backends/samsung/**',
+    'backends/test/**',
+    'backends/vulkan/**',
+    'backends/webgpu/**',
+    'backends/xnnpack/**',
+
+    # Backend-owned examples to onboard with those backends.
+    'examples/demo-apps/**',
+    'examples/mediatek/**',
+    'examples/nxp/**',
+    'examples/qualcomm/**',
+    'examples/samsung/**',
+
+    # Other examples to onboard separately.
+    'examples/devtools/**',
+    'examples/llm_manual/**',
+    'examples/models/**',
+    'examples/portable/**',
+    'examples/raspberry_pi/**',
+
+    # EXIR and devtools areas to onboard separately.
+    'devtools/bundled_program/**',
+    'devtools/etdump/**',
+    'exir/backend/test/**',
+    'exir/tests/**',
+    'exir/verification/**',
+
+    # Extension areas to onboard incrementally.
+    'extension/android/**',
+    'extension/apple/**',
+    'extension/asr/runner/transducer_runner.h',
+    'extension/aten_util/**',
+    'extension/benchmark/apple/**',
+    'extension/data_loader/**',
+    'extension/evalue_util/**',
+    'extension/flat_tensor/**',
+    'extension/kernel_util/make_boxed_from_unboxed_functor.h',
+    'extension/kernel_util/test/**',
+    'extension/llm/**',
+    'extension/memory_allocator/**',
+    'extension/module/**',
+    'extension/named_data_map/**',
+    'extension/pybindings/**',
+    'extension/pytree/**',
+    'extension/runner_util/**',
+    'extension/tensor/**',
+    'extension/testing_util/**',
+    'extension/threadpool/**',
+    'extension/training/**',
+    'extension/wasm/**',
+
+    # Kernel areas to onboard separately.
+    'kernels/aten/**',
+    'kernels/optimized/**',
+    'kernels/portable/**',
+    'kernels/prim_ops/**',
+    'kernels/quantized/**',
+    'kernels/test/**',
+
+    # Runtime areas to onboard incrementally.
+    'runtime/backend/**',
+    'runtime/core/**',
+    'runtime/executor/**',
+    'runtime/kernel/**',
+    'runtime/platform/**',
+
+    # Top-level test and platform integration areas.
+    'test/**',
+    'zephyr/**',
 ]
 command = [
     'python',