diff --git a/.dockerignore b/.dockerignore
index 0ec45acbf..e4d93ad6c 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -1,5 +1,6 @@
 prover/
 .git/
+.claude/
 contracts/node_modules/
 gas-oracle/app/target/
 node/build/
diff --git a/ops/devnet-morph/tests/test_devnet_config.py b/ops/devnet-morph/tests/test_devnet_config.py
index 1b88cc38c..836c75091 100644
--- a/ops/devnet-morph/tests/test_devnet_config.py
+++ b/ops/devnet-morph/tests/test_devnet_config.py
@@ -17,6 +17,10 @@ def test_root_dockerignore_excludes_generated_build_outputs(self):
             "gas-oracle/app/target/",
             "node/build/",
             "ops/docker/.devnet/",
+            # Claude Code keeps its worktrees here; on a machine that has used
+            # one, this is the single largest directory in the repo and every
+            # image build would ship it as build context.
+            ".claude/",
         ):
             self.assertIn(generated_path, dockerignore)