diff --git a/pyproject.toml b/pyproject.toml
index 0a846ca1..b26422c2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -129,6 +129,27 @@ banned-module-level-imports = [
 required-imports = ["from __future__ import annotations"]
 
 [tool.pyright]
+# Expand nested coverage incrementally. The remaining parser directories have
+# existing diagnostics that need format-specific type review before enabling
+# them; listing clean modules here keeps CI useful without globally suppressing
+# the existing type-checking debt.
 include = [
     "dpdata/*.py",
+    "dpdata/formats/openmx/**/*.py",
+    "dpdata/formats/pwmat/**/*.py",
+    "dpdata/formats/pymatgen/**/*.py",
+    "dpdata/formats/siesta/**/*.py",
+    "dpdata/md/msd.py",
+    "dpdata/md/pbc.py",
+    "dpdata/plugins/cp2k.py",
+    "dpdata/plugins/fhi_aims.py",
+    "dpdata/plugins/gromacs.py",
+    "dpdata/plugins/list.py",
+    "dpdata/plugins/lmdb.py",
+    "dpdata/plugins/openmx.py",
+    "dpdata/plugins/orca.py",
+    "dpdata/plugins/psi4.py",
+    "dpdata/plugins/qe.py",
+    "dpdata/plugins/rdkit.py",
+    "dpdata/plugins/siesta.py",
 ]