diff --git a/.devcontainer/backend/requirements.txt b/.devcontainer/backend/requirements.txt
index 78131981..f98b167e 100644
--- a/.devcontainer/backend/requirements.txt
+++ b/.devcontainer/backend/requirements.txt
@@ -29,3 +29,8 @@ moto[s3,sqs]==5.0.28  # mock_aws (moto 5.x) for S3/SQS in orchestration tests
 black==26.1.0
 boto3-stubs
 openai
+# Type checking — strict pyright gate (CLAUDE.md). The pip `pyright` wrapper uses
+# the container's Node. pandas-stubs lets pandas-typed modules check cleanly
+# (CLAUDE.md: add pandas-stubs when introducing pandas to a module).
+pyright==1.1.411
+pandas-stubs