diff --git a/packages/claude-code-plugin/.npmignore b/packages/claude-code-plugin/.npmignore
new file mode 100644
index 00000000..1d3003ec
--- /dev/null
+++ b/packages/claude-code-plugin/.npmignore
@@ -0,0 +1,14 @@
+# Build/Dev artifacts
+dist/
+src/
+coverage/
+*.tsbuildinfo
+
+# Python cache
+__pycache__/
+*.pyc
+*.pyo
+.pytest_cache/
+
+# Note: hooks/ test/runtime exclusions are in hooks/.npmignore
+# (root .npmignore cannot override package.json "files" field)
diff --git a/packages/claude-code-plugin/hooks/.npmignore b/packages/claude-code-plugin/hooks/.npmignore
new file mode 100644
index 00000000..9152130f
--- /dev/null
+++ b/packages/claude-code-plugin/hooks/.npmignore
@@ -0,0 +1,13 @@
+# Runtime artifacts
+.omc/
+
+# Test files
+test_*.py
+tests/
+lib/test_*.py
+
+# Python cache
+__pycache__/
+*.pyc
+*.pyo
+.pytest_cache/