diff --git a/src/agents/pi-tool-definition-adapter.ts b/src/agents/pi-tool-definition-adapter.ts
index f42aecc416..6b97690393 100644
--- a/src/agents/pi-tool-definition-adapter.ts
+++ b/src/agents/pi-tool-definition-adapter.ts
@@ -40,9 +40,9 @@ export function toToolDefinitions(tools: AnyAgentTool[]): ToolDefinition[] {
       execute: async (
         toolCallId,
         params,
+        signal: AbortSignal | undefined,
         onUpdate: AgentToolUpdateCallback<unknown> | undefined,
         _ctx,
-        signal: AbortSignal | undefined,
       ): Promise<AgentToolResult<unknown>> => {
         try {
           return await tool.execute(toolCallId, params, signal, onUpdate);
@@ -91,9 +91,9 @@ export function toClientToolDefinitions(
       execute: async (
         toolCallId,
         params,
+        _signal: AbortSignal | undefined,
         _onUpdate: AgentToolUpdateCallback<unknown> | undefined,
         _ctx,
-        _signal: AbortSignal | undefined,
       ): Promise<AgentToolResult<unknown>> => {
         const outcome = await runBeforeToolCallHook({
           toolName: func.name,