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Sweep 06 Nov 2026 · 01:32Z Build v2.1.319 537 read Stable v2.1.311 Latest v2.1.318 Next v2.1.319 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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What has changed since

An entry is only as true as the day it was written.

Flags move on the server after a release ships. Anthropic's own notes land days later and their documentation later still. Sometimes an entry turns out to be wrong and gets corrected by hand. All of that is recorded against the entry it happened to, and this is the whole of it in the order it happened.

Nothing here replaces an entry. Every line links to the page its release published, still saying what that release said, because a correction is added and dated rather than swapped in.

Events22,540dated, and never edited afterwards
Newestthe last time anything moved
Flag readings moved17,188a reading is one sample, for one account
Documentation arrived5,242a docs edit touched an entry's names
WhenEntryWhat happened
v2.1.265retries Documentation arrivedAnthropic's documentation has since written up retries, on List Events.
the line in the docs

The model is currently overloaded. Emitted after automatic retries are exhausted.
v2.1.265retries Documentation arrivedAnthropic's documentation has since written up retries, on List Events.
the line in the docs

The model is currently overloaded. Emitted after automatic retries are exhausted.
v2.1.229onError Documentation arrivedAnthropic's documentation has since written up onError, on List Events.
the line in the docs

- `BetaManagedAgentsSessionErrorEvent object`
v2.1.267Client Documentation arrivedAnthropic's documentation has since written up Client, on List Events.
the line in the docs

The judgement's grounds in registry-bound terms, for client branching and audit rather than end-user display. Open registry; currently "indeterminate" (no judgement was reached). Clients must tolerate values outside this set.
v2.1.267surface Documentation arrivedAnthropic's documentation has since written up surface, on List Events.
the line in the docs

When set, this event was cross-posted from a subagent's thread to surface its custom tool use on the primary thread's stream. Empty on the thread's own events. Echo this on a `user.custom_tool_result` event to route the result back.
v2.1.267surface Documentation arrivedAnthropic's documentation has since written up surface, on List Events.
the line in the docs

When set, this event was cross-posted from a subagent's thread to surface its custom tool use on the primary thread's stream. Empty on the thread's own events. Echo this on a `user.custom_tool_result` event to route the result back.
v2.1.257action Documentation arrivedAnthropic's documentation has since written up action, on List Events.
the line in the docs

The id of the `agent.tool_use` or `agent.mcp_tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list#beta_managed_agents_s…
v2.1.234stop_reason Documentation arrivedAnthropic's documentation has since written up stop_reason, on List Events.
the line in the docs

The id of the `agent.tool_use` or `agent.mcp_tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list#beta_managed_agents_s…
v2.1.260Input Documentation arrivedAnthropic's documentation has since written up Input, on Create Session.
the line in the docs

- `input_schema: BetaManagedAgentsCustomToolInputSchema`
v2.1.247wait Documentation arrivedAnthropic's documentation has since written up wait, on Create Session.
the line in the docs

A custom tool that is executed by the API client rather than the agent. When the agent calls this tool, an `agent.custom_tool_use` event is emitted and the session goes idle, waiting for the client to provide the result via a `user.custom_…
v2.1.224tengu_woven_harbor Flag reading movedThe flag server now returns off for tengu_woven_harbor, read as this account.
v2.1.234tengu_workflows_enabled Flag reading movedThe flag server now returns on for tengu_workflows_enabled, read as this account.
v2.1.234tengu_workflows_enabled Flag reading movedThe flag server now returns on for tengu_workflows_enabled, read as this account.
v2.1.248tengu_wise_star Flag reading movedThe flag server now returns on for tengu_wise_star, read as this account.
v2.1.246tengu_windows_credman Flag reading movedThe flag server now returns off for tengu_windows_credman, read as this account.
v2.1.246tengu_windows_credman Flag reading movedThe flag server now returns off for tengu_windows_credman, read as this account.
v2.1.239tengu_windows_credman Flag reading movedThe flag server now returns off for tengu_windows_credman, read as this account.
v2.1.247tengu_willow_tern Flag reading movedThe flag server now returns off for tengu_willow_tern, read as this account.
v2.1.247tengu_willow_tern Flag reading movedThe flag server now returns off for tengu_willow_tern, read as this account.
v2.1.110tengu_willow_mode Flag reading movedThe flag server now returns "hint_v2" for tengu_willow_mode, read as this account.
v2.1.228tengu_willow_crate Flag reading movedThe flag server now returns off for tengu_willow_crate, read as this account.
v2.1.228tengu_willow_crate Flag reading movedThe flag server now returns off for tengu_willow_crate, read as this account.
v2.1.228tengu_willow_crate Flag reading movedThe flag server now returns off for tengu_willow_crate, read as this account.
v2.1.207tengu_walnut_spire Flag reading movedThe flag server now returns off for tengu_walnut_spire, read as this account.
v2.1.235tengu_walnut_spire Flag reading movedThe flag server now returns off for tengu_walnut_spire, read as this account.
v2.1.233tengu_walnut_spire Flag reading movedThe flag server now returns off for tengu_walnut_spire, read as this account.
v2.1.233tengu_walnut_spire Flag reading movedThe flag server now returns off for tengu_walnut_spire, read as this account.
v2.1.233tengu_walnut_spire Flag reading movedThe flag server now returns off for tengu_walnut_spire, read as this account.
v2.1.248tengu_violin_wood Flag reading movedThe flag server now returns off for tengu_violin_wood, read as this account.
v2.1.248tengu_violin_wood Flag reading movedThe flag server now returns off for tengu_violin_wood, read as this account.
v2.1.248tengu_violin_wood Flag reading movedThe flag server now returns off for tengu_violin_wood, read as this account.
v2.1.248tengu_violin_wood Flag reading movedThe flag server now returns off for tengu_violin_wood, read as this account.
v2.1.247tengu_violin_wood Flag reading movedThe flag server now returns off for tengu_violin_wood, read as this account.
v2.1.247tengu_violin_wood Flag reading movedThe flag server now returns off for tengu_violin_wood, read as this account.
v2.1.247tengu_violin_wood Flag reading movedThe flag server now returns off for tengu_violin_wood, read as this account.
v2.1.247tengu_violin_wood Flag reading movedThe flag server now returns off for tengu_violin_wood, read as this account.
v2.1.247tengu_violin_wood Flag reading movedThe flag server now returns off for tengu_violin_wood, read as this account.
v2.1.247tengu_violin_wood Flag reading movedThe flag server now returns off for tengu_violin_wood, read as this account.
v2.1.239tengu_violin_wood Flag reading movedThe flag server now returns off for tengu_violin_wood, read as this account.
v2.1.239tengu_violin_wood Flag reading movedThe flag server now returns off for tengu_violin_wood, read as this account.
v2.1.239tengu_violin_wood Flag reading movedThe flag server now returns off for tengu_violin_wood, read as this account.
v2.1.239tengu_violin_wood Flag reading movedThe flag server now returns off for tengu_violin_wood, read as this account.
v2.1.239tengu_violin_wood Flag reading movedThe flag server now returns off for tengu_violin_wood, read as this account.
v2.1.239tengu_violin_wood Flag reading movedThe flag server now returns off for tengu_violin_wood, read as this account.
v2.1.239tengu_violin_wood Flag reading movedThe flag server now returns off for tengu_violin_wood, read as this account.
v2.1.235tengu_violin_wood Flag reading movedThe flag server now returns off for tengu_violin_wood, read as this account.
v2.1.235tengu_violin_wood Flag reading movedThe flag server now returns off for tengu_violin_wood, read as this account.
v2.1.232tengu_violin_wood Flag reading movedThe flag server now returns off for tengu_violin_wood, read as this account.
v2.1.228tengu_violin_wood Flag reading movedThe flag server now returns off for tengu_violin_wood, read as this account.
v2.1.228tengu_violin_wood Flag reading movedThe flag server now returns off for tengu_violin_wood, read as this account.
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