From e00d646f2813133dc11418cd03e023d4c3bbba5b Mon Sep 17 00:00:00 2001
From: Kujtim Hoxha <kujtimii.h@gmail.com>
Date: Wed, 27 Aug 2025 09:56:08 -0400
Subject: [PATCH] chore: small fix for anthropic tool choice

---
 providers/anthropic.go | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/providers/anthropic.go b/providers/anthropic.go
index 3e296ea2b0f54c7fcc60a7120c6c328c47fa60dd..2fce44147c0069304d57114225d9753e89757a6f 100644
--- a/providers/anthropic.go
+++ b/providers/anthropic.go
@@ -374,6 +374,14 @@ func toAnthropicTools(tools []ai.Tool, toolChoice *ai.ToolChoice, disableParalle
 		})
 	}
 	if toolChoice == nil {
+		if disableParallelToolCalls {
+			anthropicToolChoice = &anthropic.ToolChoiceUnionParam{
+				OfAuto: &anthropic.ToolChoiceAutoParam{
+					Type:                   "auto",
+					DisableParallelToolUse: param.NewOpt(disableParallelToolCalls),
+				},
+			}
+		}
 		return
 	}
 
@@ -392,6 +400,8 @@ func toAnthropicTools(tools []ai.Tool, toolChoice *ai.ToolChoice, disableParalle
 				DisableParallelToolUse: param.NewOpt(disableParallelToolCalls),
 			},
 		}
+	case ai.ToolChoiceNone:
+		return
 	default:
 		anthropicToolChoice = &anthropic.ToolChoiceUnionParam{
 			OfTool: &anthropic.ToolChoiceToolParam{