tengu_event_sampling_config
A Claude Code feature flag, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.
Default {}. A per-event sampling table for Claude Code's own analytics events, keyed by event name. When an event's entry has a numeric sample_rate between 0 and 1, a rate of 0 drops the event, a rate below 1 keeps it with that probability and adds sample_rate to the logged fields, and a rate of 1 logs it normally; a missing entry or an invalid rate also logs normally.
Not Anthropic's. Written by Claude Opus 5.5 from reading the v2.1.286 bundle, and it can be wrong.
In the changelogs
1Releases whose published page names tengu_event_sampling_config.
-
v2.0.54
Telemetry Event Sampling
gate cited by this entry, found in this entry's text
Gate readings
1| Release | Resolved | This account | Anonymous | Compiled default |
|---|---|---|---|---|
| v2.0.54 read on another version | Not enough to say | no value returned | no value returned | no gate table built for this version |
Two arms, because they disagree: this account is the one account this site reads and anonymous is a baseline with no identity attached. A reading says nothing about your account, and off cannot rule out a rollout both readings sit outside of. What these readings can and cannot show.
Flag server, over time
18| Read as | Reading | From | Until | Version installed |
|---|---|---|---|---|
| anonymous | {"tengu_api_after_normalize":{"sample_rate":0},"tengu_api_before_normalize":{"sample_rate":0},"tengu_api_cache_breakpoints":{"sample_rate":0.01},"tengu_plugin_name_collision":{"sample_rate":0.01},"tengu_query_after_attachments":{"sample_rate":0},"tengu_query_before_attachments":{"sample_rate":0},"tengu_session_file_read":{"sample_rate":0.01},"tengu_skill_file_changed":{"sample_rate":0},"tengu_sysprompt_block":{"sample_rate":0.01},"tengu_sysprompt_boundary_found":{"sample_rate":0.01},"tengu_sysprompt_missing_boundary_marker":{"sample_rate":0.01}} | 2026-10-17T05:30:04Z | 2026-10-22T06:25:04Z | v2.1.302 to v2.1.308 |
| this account | {"tengu_api_after_normalize":{"sample_rate":0},"tengu_api_before_normalize":{"sample_rate":0},"tengu_api_cache_breakpoints":{"sample_rate":0.01},"tengu_plugin_name_collision":{"sample_rate":0.01},"tengu_query_after_attachments":{"sample_rate":0},"tengu_query_before_attachments":{"sample_rate":0},"tengu_session_file_read":{"sample_rate":0.01},"tengu_skill_file_changed":{"sample_rate":0},"tengu_sysprompt_block":{"sample_rate":0.01},"tengu_sysprompt_boundary_found":{"sample_rate":0.01},"tengu_sysprompt_missing_boundary_marker":{"sample_rate":0.01}} | 2026-09-30T19:55:04Z | 2026-10-22T06:25:04Z | v2.1.286 to v2.1.308 |
| anonymous | no longer carried | 2026-10-17T05:25:57Z | 2026-10-17T05:25:57Z | v2.1.302 |
| anonymous | {"tengu_api_after_normalize":{"sample_rate":0},"tengu_api_before_normalize":{"sample_rate":0},"tengu_api_cache_breakpoints":{"sample_rate":0.01},"tengu_plugin_name_collision":{"sample_rate":0.01},"tengu_query_after_attachments":{"sample_rate":0},"tengu_query_before_attachments":{"sample_rate":0},"tengu_session_file_read":{"sample_rate":0.01},"tengu_skill_file_changed":{"sample_rate":0},"tengu_sysprompt_block":{"sample_rate":0.01},"tengu_sysprompt_boundary_found":{"sample_rate":0.01},"tengu_sysprompt_missing_boundary_marker":{"sample_rate":0.01}} | 2026-09-30T19:55:04Z | 2026-10-17T05:10:04Z | v2.1.286 to v2.1.302 |
| this account | {"tengu_plugin_name_collision":{"sample_rate":0.01},"tengu_session_file_read":{"sample_rate":0.01},"tengu_skill_file_changed":{"sample_rate":0}} | 2026-09-10T21:47:12Z | 2026-09-30T19:50:04Z | v2.1.268 to v2.1.286 |
| anonymous | {"tengu_plugin_name_collision":{"sample_rate":0.01},"tengu_session_file_read":{"sample_rate":0.01},"tengu_skill_file_changed":{"sample_rate":0}} | 2026-08-24T18:50:04Z | 2026-09-30T19:50:04Z | v2.1.233 to v2.1.286 |
| this account | no longer carried | 2026-09-10T21:46:45Z | 2026-09-10T21:46:45Z | v2.1.268 |
| this account | {"tengu_plugin_name_collision":{"sample_rate":0.01},"tengu_session_file_read":{"sample_rate":0.01},"tengu_skill_file_changed":{"sample_rate":0}} | 2026-09-08T20:36:15Z | 2026-09-10T17:40:05Z | v2.1.263 to v2.1.267 |
| this account | no longer carried | 2026-09-08T20:34:58Z | 2026-09-08T20:34:58Z | v2.1.265 |
| this account | {"tengu_plugin_name_collision":{"sample_rate":0.01},"tengu_session_file_read":{"sample_rate":0.01},"tengu_skill_file_changed":{"sample_rate":0}} | 2026-09-06T02:40:05Z | 2026-09-08T18:45:05Z | v2.1.261 to v2.1.263 |
| this account | no longer carried | 2026-09-06T02:36:19Z | 2026-09-06T02:36:19Z | v2.1.263 |
| this account | {"tengu_plugin_name_collision":{"sample_rate":0.01},"tengu_session_file_read":{"sample_rate":0.01},"tengu_skill_file_changed":{"sample_rate":0}} | 2026-08-24T19:25:04Z | 2026-09-06T01:55:04Z | v2.1.233 to v2.1.261 |
| this account | {"tengu_plugin_name_collision":{"sample_rate":0.01}} | 2026-08-22T15:20:04Z | 2026-08-24T18:50:04Z | v2.1.233 |
| anonymous | {"tengu_plugin_name_collision":{"sample_rate":0.01}} | 2026-08-22T15:05:05Z | 2026-08-24T17:40:05Z | v2.1.233 |
| this account | [] | 2026-08-14T22:10:05Z | 2026-08-22T15:05:05Z | v2.1.232 to v2.1.233 |
| anonymous | [] | 2026-08-19T04:25:04Z | 2026-08-22T15:00:06Z | v2.1.233 |
| anonymous | no longer carried | 2026-08-19T04:20:14Z | 2026-08-19T04:20:14Z | v2.1.233 |
| anonymous | [] | 2026-08-14T22:10:05Z | 2026-08-19T03:45:04Z | v2.1.232 to v2.1.233 |
One row per unbroken stretch of one reading, newest first, from snapshots taken every twenty-five minutes or so. No longer carried is not off: it means the flag server stopped returning the gate at all, which is what a retired experiment looks like. The version column is what was installed when the reading was taken, not what caused it.
First cited
0No release's published evidence quotes this name. The ledger indexes the Evidence lines of every changelog on this site, so this says nobody here has ever quoted it; it says nothing about how old the name is.
Presence across releases
0The miner has never read a build containing this name. It is here because a changelog entry of ours names it, which is evidence that it existed and not evidence of which releases carried it. The inventory starts at v2.1.138 and everything older than that was never mined.
Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the feature flag does. All feature flags.