{"record":{"id":"abbee9e06b8c19a2","repo":"FoundationAgents/OpenManus","slug":"failed-to-read-path-str-e","errorCode":null,"errorMessage":"Failed to read {path}: {str(e)}","messagePattern":"Failed to read (.+?): (.+?)","errorType":"exception","errorClass":"ToolError","httpStatus":null,"severity":"error","filePath":"app/tool/file_operators.py","lineNumber":52,"sourceCode":"\n    async def run_command(\n        self, cmd: str, timeout: Optional[float] = 120.0\n    ) -> Tuple[int, str, str]:\n        \"\"\"Run a shell command and return (return_code, stdout, stderr).\"\"\"\n        ...\n\n\nclass LocalFileOperator(FileOperator):\n    \"\"\"File operations implementation for local filesystem.\"\"\"\n\n    encoding: str = \"utf-8\"\n\n    async def read_file(self, path: PathLike) -> str:\n        \"\"\"Read content from a local file.\"\"\"\n        try:\n            return Path(path).read_text(encoding=self.encoding)\n        except Exception as e:\n            raise ToolError(f\"Failed to read {path}: {str(e)}\") from None\n\n    async def write_file(self, path: PathLike, content: str) -> None:\n        \"\"\"Write content to a local file.\"\"\"\n        try:\n            Path(path).write_text(content, encoding=self.encoding)\n        except Exception as e:\n            raise ToolError(f\"Failed to write to {path}: {str(e)}\") from None\n\n    async def is_directory(self, path: PathLike) -> bool:\n        \"\"\"Check if path points to a directory.\"\"\"\n        return Path(path).is_dir()\n\n    async def exists(self, path: PathLike) -> bool:\n        \"\"\"Check if path exists.\"\"\"\n        return Path(path).exists()\n\n    async def run_command(\n        self, cmd: str, timeout: Optional[float] = 120.0","sourceCodeStart":34,"sourceCodeEnd":70,"githubUrl":"https://github.com/FoundationAgents/OpenManus/blob/52a13f2a57d8c7f6737eefb02ccf569594d44273/app/tool/file_operators.py#L34-L70","documentation":"LocalFileOperator.read_file wraps any exception from Path.read_text(encoding='utf-8') in a ToolError with the path and cause. Typical underlying causes: FileNotFoundError (no such file), IsADirectoryError, PermissionError, and UnicodeDecodeError when the file is binary or in another encoding — the operator hardcodes utf-8.","triggerScenarios":"Reading a path that was never created by a previous step; reading a directory path; reading files on a read-only mount without permission; reading CSV/Excel artifacts saved as non-UTF-8 (e.g. latin-1 exports) or binary formats.","commonSituations":"Agent assumes an output file exists after a step that silently failed; workspace mounted with restrictive permissions; user-supplied files in legacy encodings.","solutions":["Check existence first: await operator.exists(path) (and is_directory) before read_file, and give a clear message when missing.","For encoding failures shown in '{e}', re-save the file as UTF-8 or subclass/extend the operator with the right encoding.","Verify the producing step succeeded before reading its output (exit code / output check), so you never read a file that was never written.","Catch ToolError at the agent layer and feed the message back so the next action corrects the path."],"exampleFix":"# before\ntext = await file_op.read_file(\"/workspace/out/report.txt\")\n\n# after\npath = \"/workspace/out/report.txt\"\nif not await file_op.exists(path):\n    raise ToolError(f\"{path} not found; did the previous step finish?\")\ntext = await file_op.read_file(path)","handlingStrategy":"try-catch","validationCode":"if not await file_op.exists(path):\n    raise ToolError(f'{path} does not exist')\nif await file_op.is_directory(path):\n    raise ToolError(f'{path} is a directory, not a file')","typeGuard":null,"tryCatchPattern":"try:\n    text = await file_op.read_file(path)\nexcept ToolError as e:\n    msg = str(e)\n    if 'No such file' in msg:\n        ...  # regenerate or correct path\n    elif 'codec' in msg or 'UnicodeDecode' in msg:\n        ...  # binary/non-utf8 file — read bytes or fix encoding\n    else:\n        raise","preventionTips":["Check exists()/is_directory() before read_file.","Confirm the producing step succeeded before reading its output.","Remember the operator hardcodes utf-8 — convert non-UTF-8 inputs upstream."],"tags":["filesystem","encoding","file-read","tool-error"],"backgroundTag":null,"analyzedSha":"52a13f2a57d8c7f6737eefb02ccf569594d44273","analyzedAt":"2026-08-15T02:33:49.993Z","schemaVersion":2},"datasetVersion":"2026-08-15T17:31:12.345Z"}