proactivityLevel
A Claude Code settings key, read out of the shipped bundle. It was in the build from v2.1.315 and was gone by v2.1.317.
Relaunching Claude Code keeps your proactivity level and permission context instead of resetting them.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.232.
In the changelogs
10Releases whose published page names proactivityLevel.
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v2.1.259
New --proactivity CLI flag (scaffolding only)
A --proactivity flag is accepted and threaded through session creation, but its value is discarded before it has any effect.
found in this entry's text, named in this entry
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v2.1.259
proactivityLevel plumbed through session/task creation
A proactivityLevel field now flows through session creation, agent launch, config parsing and telemetry, with no UI or semantics yet.
named in this entry, found in this entry's text
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v2.1.259
Background-forked sessions now inherit proactivityLevel
Backgrounding a session now carries the parent conversation's proactivity setting into the forked session.
named in this entry, found in this entry's text
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v2.1.259
New proactivityLevel parameter threaded into remote/teleport session creation
Remote session creation events accept a proactivityLevel field alongside permissionMode, ultraplan, title and thinking.
named in this entry, found in this entry's text
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v2.1.239
How proactive the session is set to be now feeds permission decisions
Permission and model routing decisions now also see how proactive the session is set to be.
found in this entry's text
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v2.1.233
API telemetry records the proactivity level
Query and result telemetry now carry a proactivity level field from your session.
found in this entry's text
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v2.1.233
Startup telemetry records proactivity level and screen-reader mode
Startup telemetry now records proactivity level and whether screen-reader mode is on.
found in this entry's text
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v2.1.233
Proactivity level wired into API request telemetry but never set
Request telemetry has a slot for a proactivity level, but it is always empty.
found in this entry's text
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v2.1.232
Proactivity level is carried across a restart
Relaunching Claude Code keeps your proactivity level and permission context instead of resetting them.
found in this entry's text
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v2.1.232
A proactivity level is threaded through sessions but does nothing yet
A proactivityLevel setting is passed around sessions but changes nothing about Claude's behaviour yet.
found in this entry's text
First cited
9The earliest release whose published evidence quoted proactivityLevel was v2.1.232, 13 Aug 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.
3 further spans in the ledger name it. The list above is the earliest first and stops at 6.
Presence across releases
2Build by build
7One row per release since the first build this name was read out of. Absent means the build was read and the name was not in it, never mined means no bundle for that release was ever archived, and a declared type or a default is only ever what that release's own bundle stated.
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 settings key does. All settings keys.