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Sweep 22 Sep 2026 · 17:19Z Build v2.1.280 501 read Stable v2.1.267 Latest v2.1.280 Next v2.1.280 Feeds RSS JSON llms.txt Unofficial
Claude Code v2.1.277 ·

SDK schema-violation telemetry now samples from a variable rate constant

SDK's outbound message schema-check sampling now uses a renamed rate variable

TierUnder the hoodhow much it should matter to you
Useful1my rating, 1 to 5
Signal0worth watching, 1 to 5
AreaSDKwhat it touches
KindInternal Changesin v2.1.277,
Under the hood

SDK's outbound message schema-check sampling now uses a renamed rate variable

What

The SDK's internal check that occasionally validates outbound messages against a schema (and reports mismatches via the tengu_sdk_schema_violation telemetry event) still decides randomly whether to run, but now reads its sampling rate from a renamed internal variable, and some of its supporting schema/parsing helper functions were renamed.

Why

This looks like an internal refactor rather than a behavior change readers would notice.

How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtWhether the sampling rate value itself changed, or only the variable's name, isn't stated; the gate `tengu_sdk_schema_violation` hasn't been…

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