diff --git a/pyproject.toml b/pyproject.toml
index d2d4e14..3fa8d5c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,7 +16,7 @@ dependencies = [
     "pyyaml>=6.0",                      # config & tool-spec parsing
     "httpx>=0.27.0",                    # HTTP client; API embeddings
     "questionary>=2.0",                 # interactive `dsagt init` select/checkbox menus
-    "mcp>=1.0.0",                       # MCP server protocol
+    "mcp>=1.0.0,<2.0.0",               # MCP server protocol
     "mlflow==3.11.1",                  # trace store & observability
     # Knowledge base
     # torch 2.2.2 (latest available for Intel Mac) was compiled against NumPy 1.x