attributionProject
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.
The claude.ai Project used for usage reports now comes from an environment variable, a setting or a managed default, and bad IDs are flagged
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.305.
In the changelogs
5Releases whose published page names attributionProject.
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v2.1.318
A /project command names the claude.ai Project for usage reports
A /project command lets a session name a claude.ai Project for usage reports, save it with --save, or remove it with clear
found in this entry's text
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v2.1.318
Claude Code names --settings when attributionProject is set there
When attributionProject comes from a --settings value, Claude Code now says "attributionProject in --settings" as its origin
named in this entry, found in this entry's text
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v2.1.318
Settings from a project now show as set with /project instead of --settings
When an attribution project is set, settings from that source are labelled "set with /project" instead of "--settings"
named in this entry, found in this entry's text
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v2.1.318
The attribution project setting now accepts IDs starting with chan_
The attributionProject setting's description now lists IDs starting with "chan_" alongside "claude_proj_" IDs and Project UUIDs
named in this entry, found in this entry's text
-
v2.1.305
How Claude Code picks the claude.ai Project for usage reports
The claude.ai Project used for usage reports now comes from an environment variable, a setting or a managed default, and bad IDs are flagged
found in this entry's text
First cited
1The earliest release whose published evidence quoted attributionProject was v2.1.318, 3 Nov 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.