diff --git a/packages/core/third_party/@mcp-b/webmcp-types/BUILD.bazel b/packages/core/third_party/@mcp-b/webmcp-types/BUILD.bazel
index 7c8b81f55d5..6c5ab54932b 100644
--- a/packages/core/third_party/@mcp-b/webmcp-types/BUILD.bazel
+++ b/packages/core/third_party/@mcp-b/webmcp-types/BUILD.bazel
@@ -11,11 +11,9 @@ genrule(
     cmd = """
         readonly SRC_DIR="$(location //packages/core:node_modules/@mcp-b/webmcp-types/dir)"
         mkdir -p "$$(dirname "$(location dist/common.d.ts)")"
-        cp "$${SRC_DIR}/dist/common.d.ts" "$(location dist/common.d.ts)"
         # Rewrite bare imports of @modelcontextprotocol/server to use the vendored relative path
-        sed -i 's|@modelcontextprotocol/server|../../../@modelcontextprotocol/server/index.js|g' "$(location dist/common.d.ts)" || true
-        cp "$${SRC_DIR}/dist/json-schema.d.ts" "$(location dist/json-schema.d.ts)"
-        sed -i 's|@modelcontextprotocol/server|../../../@modelcontextprotocol/server/index.js|g' "$(location dist/json-schema.d.ts)" || true
+        sed 's|@modelcontextprotocol/server|../../../@modelcontextprotocol/server/index.js|g' "$${SRC_DIR}/dist/common.d.ts" > "$(location dist/common.d.ts)"
+        sed 's|@modelcontextprotocol/server|../../../@modelcontextprotocol/server/index.js|g' "$${SRC_DIR}/dist/json-schema.d.ts" > "$(location dist/json-schema.d.ts)"
         cp "$${SRC_DIR}/LICENSE" "$(location LICENSE)"
     """,
 )