feat(llma): add $ai_tokens_source property to detect token value overrides#444
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andrewm4894 merged 5 commits intomasterfrom Feb 25, 2026
Merged
feat(llma): add $ai_tokens_source property to detect token value overrides#444andrewm4894 merged 5 commits intomasterfrom
andrewm4894 merged 5 commits intomasterfrom
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When users pass token properties (e.g. $ai_input_tokens) via
posthog_properties, these override the SDK-computed values. This new
$ai_tokens_source property ("sdk" or "passthrough") lets us distinguish
whether token values came from the SDK or were externally injected,
which is critical for diagnosing cost calculation discrepancies.
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posthog-python Compliance ReportDate: 2026-02-25 12:32:53 UTC ✅ All Tests Passed!29/29 tests passed Capture Tests✅ 29/29 tests passed View Details
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andrewm4894
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Adds "sdk" or "passthrough" to $ai_generation events to flag when token properties are externally overridden via posthogProperties. Mirrors the same change in posthog-python (PostHog/posthog-python#444).
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carlos-marchal-ph
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andrewm4894
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…des (#3147) Adds "sdk" or "passthrough" to $ai_generation events to flag when token properties are externally overridden via posthogProperties. Mirrors the same change in posthog-python (PostHog/posthog-python#444).
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Summary
$ai_tokens_sourceproperty ("sdk"or"passthrough") to all$ai_generationevents across sync, async, and streaming capture paths$ai_input_tokens,$ai_output_tokens,$ai_total_tokens, etc.) viaposthog_properties, the property is set to"passthrough"-- otherwise"sdk"Test plan
_get_tokens_sourcehelper (10 parameterized cases covering None, empty, unrelated, and each token key)"sdk"value