fix: change minItems from 2 to 1 for Anthropic API compatibility

daniel-lxs · daniel-lxs · commit 68e51639e1ce · 2026-01-08T15:11:37.000-05:00
The Anthropic API only supports minItems values of 0 or 1 for array types
in tool schemas. This fixes the 400 error when using ask_followup_question
with Anthropic models via OpenRouter.

Fixes ROO-420
diff --git a/src/core/prompts/tools/native-tools/ask_followup_question.ts b/src/core/prompts/tools/native-tools/ask_followup_question.ts
@@ -51,7 +51,7 @@ export default {
 						required: ["text", "mode"],
 						additionalProperties: false,
 					},
-					minItems: 2,
+					minItems: 1,
 					maxItems: 4,
 				},
 			},
