Include truncated original tool call in error message

Author: jahooma

packages/agent-runtime/src/__tests__/tool-validation-error.test.ts

@@ -101,6 +101,8 @@ describe('tool validation error handling', () => {
     )
     expect(errorEvents.length).toBe(1)
     expect(errorEvents[0].message).toContain('Invalid parameters for spawn_agents')
+    expect(errorEvents[0].message).toContain('Original tool call input:')
+    expect(errorEvents[0].message).toContain('this should be an array not a string')
 
     // Verify hadToolCallError is true so the agent loop continues
     expect(result.hadToolCallError).toBe(true)

packages/agent-runtime/src/tools/tool-executor.ts

@@ -180,9 +180,13 @@ export async function executeToolCall<T extends ToolName>(
   }
 
   if ('error' in toolCall) {
+    const inputStr = JSON.stringify(input, null, 2)
+    const truncatedInput = inputStr.length > 500
+      ? inputStr.slice(0, 500) + '...(truncated)'
+      : inputStr
     onResponseChunk({
       type: 'error',
-      message: toolCall.error,
+      message: `${toolCall.error}\n\nOriginal tool call input:\n${truncatedInput}`,
     })
     logger.debug(
       { toolCall, error: toolCall.error },
@@ -487,9 +491,13 @@ export async function executeCustomToolCall(
   }
 
   if ('error' in toolCall) {
+    const inputStr = JSON.stringify(input, null, 2)
+    const truncatedInput = inputStr.length > 500
+      ? inputStr.slice(0, 500) + '...(truncated)'
+      : inputStr
     onResponseChunk({
       type: 'error',
-      message: toolCall.error,
+      message: `${toolCall.error}\n\nOriginal tool call input:\n${truncatedInput}`,
     })
     logger.debug(
       { toolCall, error: toolCall.error },