CLAUDE_CODE_CONFIG_LOCK_WAIT_MS
A Claude Code environment variable, read out of the shipped bundle. It has been in the build since v2.1.318, including the newest one read.
If adding or removing an MCP server can't save the config, the error now blames a lock and suggests CLAUDE_CODE_CONFIG_LOCK_WAIT_MS=60000
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.318.
In the changelogs
2Releases whose published page names CLAUDE_CODE_CONFIG_LOCK_WAIT_MS.
-
v2.1.318
MCP config write errors now suggest waiting longer for a locked file
If adding or removing an MCP server can't save the config, the error now blames a lock and suggests CLAUDE_CODE_CONFIG_LOCK_WAIT_MS=60000
found in this entry's text, named in this entry
-
v2.1.318
Protection against losing
~/.claude.jsonnow applies to everyoneClaude Code now always guards your config file when it reads as missing, and
CLAUDE_CODE_CONFIG_LOCK_WAIT_MSsets how long some saves wait for the lockfound in this entry's text
First cited
2The earliest release whose published evidence quoted CLAUDE_CODE_CONFIG_LOCK_WAIT_MS 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
1Build by build
1One 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.