stampThreadState
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.
Cron-triggered prompts can now stamp thread state onto the resulting agent turn
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.265.
In the changelogs
4Releases whose published page names stampThreadState.
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v2.1.265
Prompt submission can now stamp thread state on cron-fired agent turns
Cron-triggered prompts can now stamp thread state onto the resulting agent turn
found in this entry's text
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v2.1.265
Incoming user messages in Projects threads can be stamped with thread state
User messages in Projects threads can now be tagged with the thread's state
named in this entry, found in this entry's text
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v2.1.265
"thread_state" added as a recognized prefix-delta/context category
New "thread_state" category joins prefix_delta and diagnostics in context tracking, with a related stampThreadState flag
named in this entry, found in this entry's text
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v2.1.265
"thread_state" content-block type recognized in message/prefix-delta pipelines
Claude Code's context system now recognizes a new "thread_state" content type alongside prefix_delta and diagnostics
found in this entry's text
First cited
3The earliest release whose published evidence quoted stampThreadState was v2.1.265, 8 Sep 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.
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.