{"record":{"id":"054ab50064994608","repo":"microsoft/semantic-kernel","slug":"error-while-registering-rest-function-plugin-name","errorCode":null,"errorMessage":"Error while registering Rest function {plugin_name}.{operation.id}: {ex}","messagePattern":"Error while registering Rest function (.+?)\\.(.+?): (.+?)","errorType":"exception","errorClass":"FunctionExecutionException","httpStatus":null,"severity":"error","filePath":"python/semantic_kernel/connectors/openapi_plugin/openapi_manager.py","lineNumber":106,"sourceCode":"        else None,\n    )\n\n    functions = []\n    for operation in operations.values():\n        try:\n            kernel_function = _create_function_from_operation(\n                openapi_runner,\n                operation,\n                plugin_name,\n                execution_parameters=execution_settings,\n                security=global_security_requirements,\n            )\n            functions.append(kernel_function)\n            operation.freeze()\n        except Exception as ex:\n            error_msg = f\"Error while registering Rest function {plugin_name}.{operation.id}: {ex}\"\n            logger.error(error_msg)\n            raise FunctionExecutionException(error_msg) from ex\n\n    return functions\n\n\n@experimental\ndef _create_function_from_operation(\n    runner: OpenApiRunner,\n    operation: RestApiOperation,\n    plugin_name: str | None = None,\n    execution_parameters: \"OpenAPIFunctionExecutionParameters | None\" = None,\n    document_uri: str | None = None,\n    security: list[RestApiSecurityRequirement] | None = None,\n) -> KernelFunctionFromMethod:\n    logger.info(f\"Registering OpenAPI operation: {plugin_name}.{operation.id}\")\n\n    rest_operation_params: list[RestApiParameter] = operation.get_parameters(\n        operation=operation,\n        add_payload_params_from_metadata=getattr(execution_parameters, \"enable_dynamic_payload\", True),","sourceCodeStart":88,"sourceCodeEnd":124,"githubUrl":"https://github.com/microsoft/semantic-kernel/blob/c028a0c7dc4f0814cdcbaba9d998f187a41197bf/python/semantic_kernel/connectors/openapi_plugin/openapi_manager.py#L88-L124","documentation":"A broad catch around `_create_function_from_operation(...)` and `operation.freeze()`: any exception while turning a parsed `RestApiOperation` into a `KernelFunction` is wrapped in `FunctionExecutionException` with the plugin name, operation id, and the original cause. The error is logged before being re-raised, so the inner exception text is available in logs.","triggerScenarios":"Any failure during per-operation function construction — e.g. a parameter schema that breaks `KernelParameterMetadata`, a payload build failure, a frozen-state mutation, or a freeze-time exception — surfaces here as a wrapped error. The `operation.id` in the message tells you which operation failed.","commonSituations":"A single malformed operation in an otherwise-valid spec; an operation whose schema uses constructs the plugin does not support; version skew between the spec and the connector; partial registration where some operations succeed before one fails.","solutions":["Read the `{ex}` portion / check logs (`logger.error`) to find the root cause — this error is only a wrapper.","Isolate the failing `operationId` from the message and inspect that operation in the spec.","Fix or remove the offending operation (correct its schema/parameters), then re-register.","Use operation include/exclude filters to skip the broken operation while it is being fixed."],"exampleFix":"# before: registration aborts with the wrapped message\nkernel.add_openapi_plugin(plugin_name=\"x\", openapi_document_path=\"/specs/x.yaml\")\n# -> 'Error while registering Rest function x.createUser: <root cause>'\n\n# after: exclude the broken op until fixed\nkernel.add_openapi_plugin(\n    plugin_name=\"x\",\n    openapi_document_path=\"/specs/x.yaml\",\n    execution_parameters=OpenAPIFunctionExecutionParameters(\n        exclude_operations=[\"createUser\"],\n    ),\n)","handlingStrategy":"try-catch","validationCode":"# validate each operation in the spec before registration\ndef validate_operations(spec) -> None:\n    for path, methods in spec.get(\"paths\", {}).items():\n        for method, details in methods.items():\n            assert \"operationId\" in details, f\"{method} {path} missing operationId\"\n            for p in details.get(\"parameters\", []):\n                assert p.get(\"in\"), f\"{method} {path} param {p.get('name')} missing 'in'\"\n                assert \"content\" not in p, f\"{method} {path} param {p.get('name')} uses 'content'\"\n\nvalidate_operations(spec)","typeGuard":null,"tryCatchPattern":"from semantic_kernel.exceptions import FunctionExecutionException\n\ntry:\n    functions = kernel.add_openapi_plugin(plugin_name=\"x\", openapi_parsed_spec=spec)\nexcept FunctionExecutionException as e:\n    msg = str(e)\n    if \"Error while registering Rest function\" in msg:\n        op_id = msg.split(\".\")[-1].strip(\": \")\n        logger.error(\"Failing operation likely: %s; root cause in logs\", op_id)\n    raise","preventionTips":["Read the inner `{ex}` to find the root cause before debugging.","Use include/exclude filters to isolate a single operation.","Lint specs in CI to catch schema issues early.","Keep plugin registration in a try/except with structured logging."],"tags":["openapi-plugin","registration","semantic-kernel"],"backgroundTag":null,"analyzedSha":"c028a0c7dc4f0814cdcbaba9d998f187a41197bf","analyzedAt":"2026-08-13T13:48:05.040Z","schemaVersion":2},"datasetVersion":"2026-08-13T14:17:21.547Z"}