A Claude Code environment variable, read out of the shipped bundle.
It has been in the build since v2.1.216, including the newest one read.
Read by the agent proxy setup in a remote session (CLAUDE_CODE_REMOTE truthy and CCR_AGENT_PROXY_ENABLED set), which removes it from the environment before those checks. With CCR_AGENT_PROXY_RELAY_MODE=selective and no AGENT_PROXY_URL, it is a comma-separated host list: those hosts go through the proxy relay and unlisted hosts use normal networking. An empty or unparsable list logs a warning and falls back to tunnelling all traffic.
Not Anthropic's. Written by Claude Opus 5.5 from reading the v2.1.286 bundle, and it can be wrong.
First seen v2.1.216 20 Jul 2026
Last seen v2.1.308 22 Oct 2026
Builds81 / 149on this box, as of v2.1.308
Written about v2.1.216 first named in a changelog, 20 Jul 2026
v2.1.216in the build not in the build never minedv2.1.308
In the changelogs
1
Releases whose published page names CCR_AGENT_PROXY_INCLUDE_HOSTS.
No 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
1
BuildsHow manyDatesReading
v2.1.216 – v2.1.30881 builds20 Jul 2026 → 22 Oct 2026 ◆in the build
Build by build
81
One 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.
