diff --git a/pyproject.toml b/pyproject.toml
index b88664e8..9f984a45 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -76,10 +76,13 @@ format = { chain = [
 "lint" = { chain = [
   "check:ruff",
   "typecheck",
+  "check:importable",
 ]}
 "check:ruff" = "ruff check ."
 "fix:ruff" = "ruff check --fix ."
 
+"check:importable" = "python -c 'import anthropic'"
+
 typecheck = { chain = [
   "typecheck:pyright",
   "typecheck:mypy"