feat(core): Isolate and cleanup truncated tool outputs (#17594)

packages/core/src/utils/fileUtils.ts

@@ -566,6 +566,8 @@ ${processedLines.join('\n')}`;
 /**
  * Saves tool output to a temporary file for later retrieval.
  */
+export const TOOL_OUTPUT_DIR = 'tool_output';
+
 export async function saveTruncatedToolOutput(
   content: string,
   toolName: string,
@@ -578,8 +580,10 @@ export async function saveTruncatedToolOutput(
     .replace(/[^a-z0-9]/gi, '_')
     .toLowerCase();
   const fileName = `${safeToolName}_${safeId}.txt`;
-  const outputFile = path.join(projectTempDir, fileName);
+  const toolOutputDir = path.join(projectTempDir, TOOL_OUTPUT_DIR);
+  const outputFile = path.join(toolOutputDir, fileName);
 
+  await fsPromises.mkdir(toolOutputDir, { recursive: true });
   await fsPromises.writeFile(outputFile, content);
 
   const lines = content.split('\n');