diff --git a/.agents/skills/do-web-doc-resolver/scripts/routing.py b/.agents/skills/do-web-doc-resolver/scripts/routing.py
index 13667102..50f7383d 100644
--- a/.agents/skills/do-web-doc-resolver/scripts/routing.py
+++ b/.agents/skills/do-web-doc-resolver/scripts/routing.py
@@ -233,7 +233,7 @@ def plan_provider_order(
             ]
     else:
         # DuckDuckGo deprioritized due to instability (Alert 2026-04-20)
-        # Serper deprioritized due to instability (Alert 2026-07-20)
+        # Serper deprioritized due to instability (Alert 2026-07-20 / Alert 2026-08-20)
         base = ["exa_mcp", "exa", "tavily", "mistral_websearch", "duckduckgo", "serper"]
 
     skip_providers = skip_providers or set()
diff --git a/agents-docs/ISSUES.md b/agents-docs/ISSUES.md
index 9235fd31..ee138087 100644
--- a/agents-docs/ISSUES.md
+++ b/agents-docs/ISSUES.md
@@ -35,3 +35,10 @@
 - **Issue**: Status code 403: {"message":"Unauthorized.","statusCode":403}
 - **Action Taken**: Deprioritized serper in the routing logic.
 - **Status**: Monitoring for stability.
+
+## Provider Alert: serper unstable
+
+- **Date**: 2026-08-20
+- **Issue**: Status code 403: {"message":"Unauthorized.","statusCode":403}
+- **Action Taken**: Deprioritized serper in the routing logic.
+- **Status**: Monitoring for stability.
diff --git a/scripts/routing.py b/scripts/routing.py
index 13667102..50f7383d 100644
--- a/scripts/routing.py
+++ b/scripts/routing.py
@@ -233,7 +233,7 @@ def plan_provider_order(
             ]
     else:
         # DuckDuckGo deprioritized due to instability (Alert 2026-04-20)
-        # Serper deprioritized due to instability (Alert 2026-07-20)
+        # Serper deprioritized due to instability (Alert 2026-07-20 / Alert 2026-08-20)
         base = ["exa_mcp", "exa", "tavily", "mistral_websearch", "duckduckgo", "serper"]
 
     skip_providers = skip_providers or set()