METADATA_SERVER_DETECTIONA Claude Code environment variable, read out of the shipped bundle.
It has been in the build since v2.1.138, including the newest one read.
Controls how the bundled Google gcp-metadata library decides whether a GCE metadata server is available. The trimmed, lowercased value must be assume-present (treat it as present without a ping), none (treat it as absent), bios-only (use only the BIOS probe) or ping-only (skip straight to pinging); any other non-empty value throws a RangeError, and unset uses the default ping.
Not Anthropic's. Written by Claude Opus 5.5 from reading the v2.1.286 bundle, and it can be wrong.
First seen v2.1.138 9 May 2026
Last seen v2.1.309 22 Oct 2026
Builds 150 / 150 on this box, as of v2.1.309
Written about v2.1.202 first named in a changelog, 6 Jul 2026
v2.1.138 v2.1.309
In the changelogs
1
Releases whose published page names METADATA_SERVER_DETECTION.
v2.1.202 6 Jul 2026
First cited
1
The earliest release whose published evidence quoted METADATA_SERVER_DETECTION was v2.1.202 , 6 Jul 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.
Release Date The span that was quoted
v2.1.202 6 Jul 2026 METADATA_SERVER_DETECTION
Presence across releases
1
Builds How many Dates Reading
v2.1.138 – v2.1.309 150 builds 9 May 2026 → 22 Oct 2026 ◆ in the build
Build by build
150
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.
Build Date State The record behind it
v2.1.138 9 May 2026 · presentverdict: present v2.1.139 11 May 2026 · presentverdict: present v2.1.140 12 May 2026 · presentverdict: present v2.1.163 4 Jun 2026 · presentverdict: present v2.1.165 5 Jun 2026 · presentverdict: present v2.1.166 5 Jun 2026 · presentverdict: present v2.1.167 6 Jun 2026 · presentverdict: present v2.1.168 6 Jun 2026 · presentverdict: present v2.1.169 8 Jun 2026 · presentverdict: present v2.1.170 9 Jun 2026 · presentverdict: present v2.1.172 10 Jun 2026 · presentverdict: present v2.1.173 11 Jun 2026 · presentverdict: present v2.1.174 11 Jun 2026 · presentverdict: present v2.1.175 12 Jun 2026 · presentverdict: present v2.1.176 12 Jun 2026 · presentverdict: present v2.1.177 13 Jun 2026 · presentverdict: present v2.1.178 15 Jun 2026 · presentverdict: present v2.1.179 16 Jun 2026 · presentverdict: present v2.1.181 17 Jun 2026 · presentverdict: present v2.1.182 18 Jun 2026 · presentverdict: present v2.1.183 19 Jun 2026 · presentverdict: present v2.1.185 20 Jun 2026 · presentverdict: present v2.1.186 22 Jun 2026 · presentverdict: present v2.1.187 23 Jun 2026 · presentverdict: present v2.1.190 24 Jun 2026 · presentverdict: present v2.1.191 24 Jun 2026 · presentverdict: present v2.1.193 25 Jun 2026 · presentverdict: present v2.1.195 26 Jun 2026 · presentverdict: present v2.1.196 29 Jun 2026 · presentverdict: present v2.1.197 30 Jun 2026 · presentverdict: present v2.1.198 1 Jul 2026 · presentverdict: present v2.1.199 2 Jul 2026 · presentverdict: present v2.1.200 3 Jul 2026 · presentverdict: present v2.1.201 3 Jul 2026 · presentverdict: present v2.1.202 6 Jul 2026 · presentverdict: present v2.1.203 7 Jul 2026 · presentverdict: present v2.1.204 8 Jul 2026 · presentverdict: present v2.1.205 8 Jul 2026 · presentverdict: present v2.1.206 9 Jul 2026 · presentverdict: present v2.1.207 10 Jul 2026 · presentverdict: present v2.1.208 13 Jul 2026 · presentverdict: present v2.1.209 14 Jul 2026 · presentverdict: present v2.1.210 14 Jul 2026 · presentverdict: present v2.1.211 15 Jul 2026 · presentverdict: present v2.1.212 16 Jul 2026 · presentverdict: present v2.1.213 17 Jul 2026 · presentverdict: present v2.1.214 18 Jul 2026 · presentverdict: present v2.1.215 19 Jul 2026 · presentverdict: present v2.1.216 20 Jul 2026 · presentverdict: present v2.1.217 21 Jul 2026 · presentverdict: present v2.1.218 22 Jul 2026 · presentverdict: present v2.1.219 24 Jul 2026 · presentverdict: present v2.1.220 24 Jul 2026 · presentverdict: present v2.1.221 3 Aug 2026 · presentverdict: present v2.1.222 4 Aug 2026 · presentverdict: present v2.1.223 5 Aug 2026 · presentverdict: present v2.1.224 7 Aug 2026 · presentverdict: present v2.1.225 7 Aug 2026 · presentverdict: present v2.1.226 8 Aug 2026 · presentverdict: present v2.1.227 10 Aug 2026 · presentverdict: present v2.1.228 11 Aug 2026 · presentverdict: present v2.1.229 12 Aug 2026 · presentverdict: present v2.1.231 13 Aug 2026 · presentverdict: present v2.1.232 13 Aug 2026 · presentverdict: present v2.1.233 14 Aug 2026 · presentverdict: present v2.1.234 17 Aug 2026 · presentverdict: present v2.1.235 18 Aug 2026 · presentverdict: present v2.1.236 19 Aug 2026 · presentverdict: present v2.1.237 19 Aug 2026 · presentverdict: present v2.1.238 20 Aug 2026 · presentverdict: present v2.1.239 21 Aug 2026 · presentverdict: present v2.1.240 22 Aug 2026 · presentverdict: present v2.1.241 22 Aug 2026 · presentverdict: present v2.1.242 24 Aug 2026 · presentverdict: present v2.1.243 24 Aug 2026 · presentverdict: present v2.1.245 25 Aug 2026 · presentverdict: present v2.1.246 25 Aug 2026 · presentverdict: present v2.1.247 26 Aug 2026 · presentverdict: present v2.1.248 27 Aug 2026 · presentverdict: present v2.1.250 27 Aug 2026 · presentverdict: present v2.1.251 28 Aug 2026 · presentverdict: present v2.1.252 31 Aug 2026 · presentverdict: present v2.1.257 1 Sep 2026 · presentverdict: present v2.1.258 1 Sep 2026 · presentverdict: present v2.1.259 2 Sep 2026 · presentverdict: present v2.1.260 3 Sep 2026 · presentverdict: present v2.1.261 4 Sep 2026 · presentverdict: present v2.1.263 6 Sep 2026 · presentverdict: present v2.1.265 8 Sep 2026 · presentverdict: present v2.1.266 8 Sep 2026 · presentverdict: present v2.1.267 9 Sep 2026 · presentverdict: present v2.1.268 10 Sep 2026 · presentverdict: present v2.1.269 11 Sep 2026 · presentverdict: present v2.1.270 12 Sep 2026 · presentverdict: present v2.1.271 14 Sep 2026 · presentverdict: present v2.1.272 14 Sep 2026 · presentverdict: present v2.1.273 15 Sep 2026 · presentverdict: present v2.1.274 16 Sep 2026 · presentverdict: present v2.1.275 17 Sep 2026 · presentverdict: present v2.1.276 18 Sep 2026 · presentverdict: present v2.1.277 18 Sep 2026 · presentverdict: present v2.1.278 19 Sep 2026 · presentverdict: present v2.1.280 22 Sep 2026 · presentverdict: present v2.1.281 23 Sep 2026 · presentverdict: present v2.1.282 24 Sep 2026 · presentverdict: present v2.1.283 25 Sep 2026 · presentverdict: present v2.1.284 28 Sep 2026 · presentverdict: present v2.1.285 29 Sep 2026 · presentverdict: present v2.1.286 30 Sep 2026 · presentverdict: present v2.1.287 1 Oct 2026 · presentverdict: present v2.1.288 2 Oct 2026 · presentverdict: present v2.1.289 3 Oct 2026 · presentverdict: present v2.1.290 5 Oct 2026 · presentverdict: present v2.1.291 6 Oct 2026 · presentverdict: present v2.1.292 6 Oct 2026 · presentverdict: present v2.1.293 7 Oct 2026 · presentverdict: present v2.1.294 8 Oct 2026 · presentverdict: present v2.1.295 8 Oct 2026 · presentverdict: present v2.1.296 9 Oct 2026 · presentverdict: present v2.1.299 14 Oct 2026 · presentverdict: present v2.1.300 14 Oct 2026 · presentverdict: present v2.1.301 15 Oct 2026 · presentverdict: present v2.1.302 16 Oct 2026 · presentverdict: present v2.1.303 18 Oct 2026 · presentverdict: present v2.1.304 19 Oct 2026 · presentverdict: present v2.1.305 20 Oct 2026 · presentverdict: present v2.1.306 21 Oct 2026 · presentverdict: present v2.1.307 21 Oct 2026 · presentverdict: present v2.1.308 22 Oct 2026 · presentverdict: present v2.1.309 22 Oct 2026 · presentverdict: present
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 .
