CLAUDE_CODE_SIMPLE

A 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.

Releases whose published page names CLAUDE_CODE_SIMPLE.

1. v2.1.295 8 Oct 2026
   New CLAUDE_CODE_RESTRICT_PERSONAL_CONFIG mode restricts your own Claude Code files

   Setting CLAUDE_CODE_RESTRICT_PERSONAL_CONFIG starts a session that restricts your own Claude Code files, alongside the other restricted modes

   found in this entry's text

2. v2.1.283 25 Sep 2026
   /context lists MCP server instructions as their own category

   The /context breakdown now shows how much of the context MCP server instructions take up, next to MCP tools

   found in this entry's text

3. v2.1.282 24 Sep 2026
   Internal change to how tool information is prepared for the model

   Claude Code now records message-format settings before preparing tool details, and reorders attachments in bare or CLAUDE_CODE_SIMPLE mode

   found in this entry's text, named in this entry

4. v2.1.280 22 Sep 2026
   Builtin hooks-module capability manifests expanded

   Builtin plugin hook modules were granted access to more host calls, including two new environment variables

   found in this entry's text

5. v2.1.251 28 Aug 2026
   A stripped-down system prompt mode, off in this build

   A mode keeps the system prompt static and moves environment details into conversation reminders, off by default.

   found in this entry's text

6. v2.1.248 27 Aug 2026
   Retaining tool definitions across context loss and credential changes, off by default

   Tool definitions could survive context loss and credential changes, but both halves are off.

   found in this entry's text

7. v2.1.234 17 Aug 2026
   Built-in MCP server gains schema validation, cancellation, and an unreachable locked-down HTTP mode

   The MCP server you expose now validates tool arguments and aborts work when a client cancels.

   found in this entry's text

8. v2.1.233 14 Aug 2026
   Remaining-token countdown is now on by default

   Claude now gets a running count of tokens left by default, re-anchored on each of your prompts.

   found in this entry's text

9. v2.1.232 13 Aug 2026
   A built-in "web-fetch" subagent that takes over page fetching, off by default

   A built-in web-fetch agent can take over page fetching and summarise pages, off by default.

   found in this entry's text

10. v2.1.232 13 Aug 2026
    Web fetching can be routed through a built-in agent

    Fetches can be handed to a dedicated agent, but the server flag defaults off.

    named in this entry, found in this entry's text

11. v2.1.227 10 Aug 2026
    Coordinator agents told to hand blocked tools to a worker

    When a coordinator agent cannot use a tool, Claude is told to run it from a worker.

    named in this entry, found in this entry's text

12. v2.1.212 16 Jul 2026
    CLAUDE_CODE_SIMPLE Environment Variable

    found in this entry's text

13. v2.1.50 20 Feb 2026
    CLAUDE_CODE_SIMPLE Mode Improvements

    found in this entry's text

The earliest release whose published evidence quoted CLAUDE_CODE_SIMPLE was v2.1.50, 20 Feb 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.

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.