CLAUDE_ARTIFACT_HOST_GRANT
A Claude Code environment variable, read out of the shipped bundle. It has been in the build since v2.1.271, including the newest one read.
MCP tool access can now be restricted by a host-issued grant token via CLAUDE_ARTIFACT_HOST_GRANT
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.271.
In the changelogs
3Releases whose published page names CLAUDE_ARTIFACT_HOST_GRANT.
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v2.1.271
MCP tool access can be scoped by a host-issued grant token
MCP tool access can now be restricted by a host-issued grant token via CLAUDE_ARTIFACT_HOST_GRANT
found in this entry's text, named in this entry
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v2.1.271
Artifact publish now refuses to silently carry forward local-server capabilities beyond this computer's grant
Publishing an artifact now blocks if it would silently carry over local-server capabilities beyond this computer's grant
found in this entry's text, named in this entry
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v2.1.271
Artifact publish now checks a local host-server grant before declaring host: servers
Publishing an artifact with local MCP servers now checks a host-app grant and can drop or block servers it doesn't cover
found in this entry's text, named in this entry
First cited
1The earliest release whose published evidence quoted CLAUDE_ARTIFACT_HOST_GRANT was v2.1.271, 14 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
1Build by build
45One 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 environment variable does. All environment variables.