@@ -101,10 +101,10 @@ export class AnthropicHandler extends BaseProvider implements SingleCompletionHa
 		if (modelId === "claude-fable-5-1") {
 			if (metadata?.tool_choice === undefined) {
 				toolChoice = undefined
-			} else if (convertedToolChoice?.type === "any" || convertedToolChoice?.type === "tool") {
+			} else if (metadata.tool_choice === "required" || typeof metadata.tool_choice === "object") {
 				toolChoice = {
 					type: "auto" as const,
-					disable_parallel_tool_use: convertedToolChoice.disable_parallel_tool_use,
+					disable_parallel_tool_use: metadata.parallelToolCalls === false,
 				}
 			}
 		}
Original file line number	Diff line number	Diff line change
`@@ -101,10 +101,10 @@ export class AnthropicHandler extends BaseProvider implements SingleCompletionHa`
`101`	`101`	`if (modelId === "claude-fable-5-1") {`
`102`	`102`	`if (metadata?.tool_choice === undefined) {`
`103`	`103`	`toolChoice = undefined`
`104`		`- } else if (convertedToolChoice?.type === "any" \|\| convertedToolChoice?.type === "tool") {`
	`104`	`+ } else if (metadata.tool_choice === "required" \|\| typeof metadata.tool_choice === "object") {`
`105`	`105`	`toolChoice = {`
`106`	`106`	`type: "auto" as const,`
`107`		`- disable_parallel_tool_use: convertedToolChoice.disable_parallel_tool_use,`
	`107`	`+ disable_parallel_tool_use: metadata.parallelToolCalls === false,`
`108`	`108`	`}`
`109`	`109`	`}`
`110`	`110`	`}`