diff --git a/lib/messages/prune.ts b/lib/messages/prune.ts
index cb0ba18..fc97aee 100644
--- a/lib/messages/prune.ts
+++ b/lib/messages/prune.ts
@@ -24,6 +24,9 @@ const buildPrunableToolsList = (
         if (config.strategies.pruneTool.protectedTools.includes(toolParameterEntry.tool)) {
             return
         }
+        if (toolParameterEntry.compacted) {
+            return
+        }
         const numericId = toolIdList.indexOf(toolCallId)
         const paramKey = extractParameterKey(toolParameterEntry.tool, toolParameterEntry.parameters)
         const description = paramKey ? `${toolParameterEntry.tool}, ${paramKey}` : toolParameterEntry.tool
diff --git a/lib/state/tool-cache.ts b/lib/state/tool-cache.ts
index 854aaaa..3325367 100644
--- a/lib/state/tool-cache.ts
+++ b/lib/state/tool-cache.ts
@@ -31,6 +31,7 @@ export async function syncToolCache(
                         parameters: part.state?.input ?? {},
                         status: part.state.status as ToolStatus | undefined,
                         error: part.state.status === "error" ? part.state.error : undefined,
+                        compacted: part.state.status === "completed" && !!part.state.time.compacted,
                     }
                 )
 
diff --git a/lib/state/types.ts b/lib/state/types.ts
index 89fc8e7..e1b92a7 100644
--- a/lib/state/types.ts
+++ b/lib/state/types.ts
@@ -12,6 +12,7 @@ export interface ToolParameterEntry {
     parameters: any
     status?: ToolStatus
     error?: string
+    compacted?: boolean
 }
 
 export interface SessionStats {