{"record":{"id":"bbd2768eec8265f5","repo":"BerriAI/litellm","slug":"invalid-model-format-expected-format-model-bedr","errorCode":null,"errorMessage":"Invalid model format. Expected format: 'model=bedrock/agentcore/arn:aws:bedrock-agentcore:region:account:runtime/runtime_id'","messagePattern":"Invalid model format\\. Expected format: 'model=bedrock/agentcore/arn:aws:bedrock-agentcore:region:account:runtime/runtime_id'","errorType":"validation","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"litellm/llms/bedrock/chat/agentcore/transformation.py","lineNumber":163,"sourceCode":"            headers=headers,\n            optional_params=optional_params,\n            request_data=request_data,\n            api_base=api_base,\n            model=model,\n            stream=stream,\n            fake_stream=fake_stream,\n            api_key=api_key,\n        )\n\n    def _get_agent_runtime_arn(self, model: str) -> str:\n        \"\"\"\n        Extract ARN from model string\n        model = \"agentcore/arn:aws:bedrock-agentcore:us-west-2:888602223428:runtime/hosted_agent_r9jvp-3ySZuRHjLC\"\n        returns: \"arn:aws:bedrock-agentcore:us-west-2:888602223428:runtime/hosted_agent_r9jvp-3ySZuRHjLC\"\n        \"\"\"\n        parts: Final = model.split(\"/\", 1)\n        if len(parts) != 2 or parts[0] != \"agentcore\":\n            raise ValueError(\n                \"Invalid model format. Expected format: 'model=bedrock/agentcore/arn:aws:bedrock-agentcore:region:account:runtime/runtime_id'\"\n            )\n        return parts[1]\n\n    def _extract_region_from_arn(self, arn: str) -> str:\n        \"\"\"\n        Extract region from ARN\n        arn:aws:bedrock-agentcore:us-west-2:888602223428:runtime/hosted_agent_r9jvp-3ySZuRHjLC\n        returns: us-west-2\n        \"\"\"\n        parts: Final = arn.split(\":\")\n        if len(parts) >= 4:\n            return parts[3]\n        raise ValueError(f\"Invalid ARN format: {arn}\")\n\n    def _get_runtime_session_id(self, optional_params: dict) -> str:\n        \"\"\"\n        Get or generate runtime session ID (must be 33+ chars)","sourceCodeStart":145,"sourceCodeEnd":181,"githubUrl":"https://github.com/BerriAI/litellm/blob/6c2dcb801bf2b75c18f1bb24140e7cf57465cc4d/litellm/llms/bedrock/chat/agentcore/transformation.py#L145-L181","documentation":"Error \"Invalid model format. Expected format: 'model=bedrock/agentcore/arn:aws:bedrock-agentcore:region:account:runtime/runtime_id'\" thrown in BerriAI/litellm.","triggerScenarios":"Thrown at litellm/llms/bedrock/chat/agentcore/transformation.py:163 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Use model format 'bedrock/agentcore/arn:aws:bedrock-agentcore:region:account:runtime/runtime_id'."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"6c2dcb801bf2b75c18f1bb24140e7cf57465cc4d","analyzedAt":"2026-08-15T07:12:03.035Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}