From e8aa2d0d6d5de8a0f90387ac234a0c92423c8bf9 Mon Sep 17 00:00:00 2001
From: Erica Pisani <pisani.erica@gmail.com>
Date: Wed, 8 Apr 2026 14:17:03 -0400
Subject: [PATCH] fix: Support 'args' key in response tool call argument
 extraction

Some frameworks (e.g. LangGraph Python) return tool calls with an
'args' key instead of 'arguments'. Add 'args' as a fallback in
checkResponseToolCalls so these tool calls are validated correctly.

Refs PY-2281
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 src/test-cases/checks.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/test-cases/checks.ts b/src/test-cases/checks.ts
index 31a835d..b360498 100644
--- a/src/test-cases/checks.ts
+++ b/src/test-cases/checks.ts
@@ -875,6 +875,7 @@ export function checkResponseToolCalls(
         let actualArgs: Record<string, unknown>;
         const argsRaw =
           foundCall.arguments ||
+          foundCall.args ||
           (foundCall.function as Record<string, unknown>)?.arguments;
 
         if (typeof argsRaw === "string") {