{"record":{"id":"6da5c4f0b5dafb40","repo":"Fosowl/agenticSeek","slug":"anthropic-response-is-empty","errorCode":null,"errorMessage":"Anthropic response is empty.","messagePattern":"Anthropic response is empty\\.","errorType":"exception","errorClass":"Exception","httpStatus":null,"severity":"error","filePath":"sources/llm_provider.py","lineNumber":275,"sourceCode":"        client = Anthropic(api_key=self.api_key)\n        system_message = None\n        messages = []\n        for message in history:\n            clean_message = {'role': message['role'], 'content': message['content']}\n            if message['role'] == 'system':\n                system_message = message['content']\n            else:\n                messages.append(clean_message)\n\n        try:\n            response = client.messages.create(\n                model=self.model,\n                max_tokens=1024,\n                messages=messages,\n                system=system_message\n            )\n            if response is None:\n                raise Exception(\"Anthropic response is empty.\")\n            thought = response.content[0].text\n            if verbose:\n                print(thought)\n            return thought\n        except Exception as e:\n            raise Exception(f\"Anthropic API error: {str(e)}\") from e\n\n    def google_fn(self, history, verbose=False):\n        \"\"\"\n        Use google gemini to generate text.\n        \"\"\"\n        base_url = self.server_ip\n        if self.is_local:\n            raise Exception(\"Google Gemini is not available for local use. Change config.ini\")\n\n        client = OpenAI(api_key=self.api_key, base_url=\"https://generativelanguage.googleapis.com/v1beta/openai/\")\n        try:\n            response = client.chat.completions.create(","sourceCodeStart":257,"sourceCodeEnd":293,"githubUrl":"https://github.com/Fosowl/agenticSeek/blob/ae57a2357745a9706cb12d0fd76d954c84d166fa/sources/llm_provider.py#L257-L293","documentation":"Raised in anthropic_fn (sources/llm_provider.py:275) when client.messages.create() returns None instead of an Anthropic Message object. The library checks for None before accessing response.content[0].text and raises 'Anthropic response is empty.' to avoid a TypeError on the None response. Like the OpenAI path, it is immediately re-wrapped by the handler at line 281, so callers see 'Anthropic API error: Anthropic response is empty.'","triggerScenarios":"client.messages.create(model=self.model, max_tokens=1024, messages=messages, system=system_message) returns None — most plausible with a proxy/gateway or non-standard base URL returning an empty 200 body, or an SDK/server deserialization mismatch. Note this is the only non-message role filtering path: system messages are extracted into system_message before the call.","commonSituations":"Corporate proxy or API gateway intercepting requests and returning empty bodies; monkeypatched or outdated anthropic SDK returning None on error instead of raising; response stubs/mocks returning None in tests wired to real code; hitting a wrong base_url that responds 200 with empty content.","solutions":["Confirm the raw API works: curl https://api.anthropic.com/v1/messages with your key, model, and messages and inspect the JSON body.","Check for proxies/gateways (HTTP_PROXY/HTTPS_PROXY, corporate middleboxes) that may return empty 200 responses; bypass them or fix their config.","Upgrade the anthropic Python SDK so errors raise properly and responses deserialize correctly instead of yielding None.","Verify the model name is a valid Anthropic model (e.g. claude-sonnet-4-20250514) and the API key is valid.","If the error came from test code, fix the mock to return a realistic Message object rather than None."],"exampleFix":"// before (test stub)\nclient.messages.create = lambda **kw: None\n\n// after\nclient.messages.create = lambda **kw: SimpleNamespace(content=[SimpleNamespace(text='stub reply')])","handlingStrategy":"type-guard","validationCode":"import os, httpx\n\ndef assert_anthropic_ready(api_key=None, model=\"claude-sonnet-4-20250514\"):\n    key = api_key or os.environ.get(\"ANTHROPIC_API_KEY\")\n    if not key:\n        raise RuntimeError(\"ANTHROPIC_API_KEY is not set\")\n    r = httpx.post(\n        \"https://api.anthropic.com/v1/messages\",\n        headers={\"x-api-key\": key, \"anthropic-version\": \"2023-06-01\"},\n        json={\"model\": model, \"max_tokens\": 1, \"messages\": [{\"role\": \"user\", \"content\": \"hi\"}]},\n        timeout=10,\n    )\n    if r.status_code == 401:\n        raise RuntimeError(\"Anthropic API key is invalid\")\n    if not r.content.strip():\n        raise RuntimeError(\"Anthropic endpoint returned an empty body (check proxies)\")\n    r.raise_for_status()","typeGuard":"def is_valid_anthropic_message(response) -> bool:\n    \"\"\"True only if the response has accessible content[0].text.\"\"\"\n    if response is None:\n        return False\n    content = getattr(response, \"content\", None)\n    if not content:\n        return False\n    return isinstance(getattr(content[0], \"text\", None), str)\n\n# usage\nif not is_valid_anthropic_message(response):\n    raise RuntimeError(\"Anthropic response is empty or malformed.\")","tryCatchPattern":"import time\n\ndef anthropic_fn_with_retry(provider, history, retries=3):\n    try:\n        return provider.anthropic_fn(history)\n    except Exception as e:\n        cause = e.__cause__\n        if \"response is empty\" in str(e).lower():\n            raise RuntimeError(\n                \"Anthropic returned an empty response; check proxies/gateway \"\n                \"and anthropic SDK version.\"\n            ) from cause\n        if \"429\" in str(e) or \"overloaded\" in str(e).lower():\n            time.sleep(2 ** retries)\n            return provider.anthropic_fn(history)\n        raise","preventionTips":["Never stub API responses with None in tests — use objects shaped like real Anthropic Messages.","Keep the anthropic SDK upgraded so errors raise as typed exceptions instead of returning None.","Audit HTTP(S)_PROXY settings and corporate gateways that might return empty 200 bodies.","Guard response.content[0].text access with a type/emptiness check.","Validate the key and model with a minimal real request before running longer pipelines."],"tags":["anthropic","empty-response","api","response-validation","proxy"],"backgroundTag":"empty-api-response","analyzedSha":"ae57a2357745a9706cb12d0fd76d954c84d166fa","analyzedAt":"2026-08-30T02:49:05.834Z","schemaVersion":2},"datasetVersion":"2026-08-30T03:17:51.788Z"}