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fix(ai/prompts): give HTTP 401 a real error message #893

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Merged
turnipdabeets merged 2 commits into from
Aug 24, 2026
Merged

fix(ai/prompts): give HTTP 401 a real error message #893

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6ececcb
fix(ai/prompts): give HTTP 401 a real error message
posthog[bot] Aug 24, 2026
bcff710
fix(ai/prompts): separate key type from param name in 401 message
posthog[bot] Aug 24, 2026
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10 changes: 10 additions & 0 deletions posthog/ai/prompts.py
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Original file line number Diff line number Diff line change
Expand Up @@ -532,6 +532,16 @@ def _fetch_prompt_from_api(
if response.status_code == 404:
raise Exception(f"[PostHog Prompts] {prompt_title} not found")

if response.status_code == 401:
raise Exception(
f"[PostHog Prompts] Authentication failed for {prompt_reference}. "
"The key may be missing, expired, or the wrong type. Prompt fetches "
"require a personal API key (starts with 'phx_'); a project secret "
"key is not accepted. Pass this key as personal_api_key when you "
"construct Prompts directly, or as secret_key when you configure the "
"PostHog client."
)

if response.status_code == 403:
raise Exception(
f"[PostHog Prompts] Access denied for {prompt_reference}. "
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16 changes: 16 additions & 0 deletions posthog/test/ai/test_prompts.py
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Original file line number Diff line number Diff line change
Expand Up @@ -402,6 +402,22 @@ def test_handle_403_response(self, mock_get_session):
'Access denied for prompt "restricted-prompt"', str(context.exception)
)

@patch("posthog.ai.prompts._get_session")
def test_handle_401_response(self, mock_get_session):
"""Should explain the likely auth causes on a 401 response."""
mock_get = mock_get_session.return_value.get
mock_get.return_value = MockResponse(status_code=401, ok=False)

posthog = self.create_mock_posthog()
prompts = Prompts(posthog)

with self.assertRaises(Exception) as context:
prompts.get("restricted-prompt", with_metadata=False)

message = str(context.exception)
self.assertIn('Authentication failed for prompt "restricted-prompt"', message)
self.assertIn("personal API key", message)

def test_throw_when_no_personal_api_key_configured(self):
"""Should throw when no personal_api_key is configured."""
posthog = self.create_mock_posthog(personal_api_key=None)
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