diff --git a/.changeset/stupid-pears-help.md b/.changeset/stupid-pears-help.md
new file mode 100644
index 0000000..08f7a5d
--- /dev/null
+++ b/.changeset/stupid-pears-help.md
@@ -0,0 +1,5 @@
+---
+"roo-cline": patch
+---
+
+Hotfix
diff --git a/src/core/Cline.ts b/src/core/Cline.ts
index 218c0e8..0970e04 100644
--- a/src/core/Cline.ts
+++ b/src/core/Cline.ts
@@ -807,7 +807,9 @@ export class Cline {
 			}
 		}
 
-		const stream = this.api.createMessage(systemPrompt, this.apiConversationHistory)
+		// Convert to Anthropic.MessageParam by spreading only the API-required properties
+		const cleanConversationHistory = this.apiConversationHistory.map(({ role, content }) => ({ role, content }))
+		const stream = this.api.createMessage(systemPrompt, cleanConversationHistory)
 		const iterator = stream[Symbol.asyncIterator]()
 
 		try {