diff --git a/sdk/guides/agent-stuck-detector.mdx b/sdk/guides/agent-stuck-detector.mdx
index 06846dc28..85d281e41 100644
--- a/sdk/guides/agent-stuck-detector.mdx
+++ b/sdk/guides/agent-stuck-detector.mdx
@@ -37,6 +37,7 @@ stuck status at any point using `conversation.stuck_detector.is_stuck()`.
 
 The stuck detector compares events based on their semantic content rather than object identity. For example:
 - **Actions** are compared by their tool name, action content, and thought (ignoring IDs and metrics)
+  - When a tool call fails validation and has no executable action, the detector also compares the retained argument strings. Different invalid arguments do not count as the same call merely because both actions are absent.
 - **Observations** are compared by their observation content and tool name
 - **Errors** are compared by their error messages
 - **Messages** are compared by their content and source