observer
A Claude Code settings key, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.
Messages with unknown provenance are now labelled as non-user input so they aren't mistaken for you.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.223.
In the changelogs
5Releases whose published page names observer.
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v2.1.323
An agent's observer field can name up to four agent types
The
observerfield in agent frontmatter is now described as taking one agent type or a comma-separated list of up to fournamed in this entry, found in this entry's text
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v2.1.296
Plugin agents now warn about misspelled and unsupported settings
Plugin agent files now log a warning for settings Claude Code does not recognize, suggest the likely intended name, and flag more ignored ones
found in this entry's text
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v2.1.271
New omitClaudeMd option for spawned agents
Spawned agents/subagents can now be configured with an 'omitClaudeMd' option
found in this entry's text
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v2.1.223
New "unclassified" message sender kind, marked as non-user input
Messages with unknown provenance are now labelled as non-user input so they aren't mistaken for you.
found in this entry's text
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v2.1.200
Observer Agents [Gradual Rollout]
found in this entry's text
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 settings key does. All settings keys.