ultracode

A Claude Code settings key, read out of the shipped bundle. It was in the build from v2.1.154 and was gone by v2.1.284.

Releases whose published page names ultracode.

1. v2.1.299 14 Oct 2026
   /effort and /fast now work in agent view

   In agent view, /effort and /fast now take effect instead of telling you to attach to a session

   found in this entry's text

2. v2.1.284 28 Sep 2026
   SDK session state says whether ultracode was requested and whether it can run

   SDK session state adds ultracodeRequested and ultracodeAvailable, and ultracode is no longer described as tied to xhigh effort

   found in this entry's text

3. v2.1.282 24 Sep 2026
   Startup tip about dynamic workflows and ultracode removed

   The startup tip pointing users to dynamic workflows and the ultracode keyword no longer appears

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

4. v2.1.282 24 Sep 2026
   Shorter status label for the ultracode effort level

   The ultracode effort label now reads "ultracode · xhigh + workflows · /effort" and points to the /effort command

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

5. v2.1.280 22 Sep 2026
   Model picker now reads session/settings effort state

   The model picker now factors in session and settings effort levels when preselecting a model

   found in this entry's text

6. v2.1.271 14 Sep 2026
   New remote-control-plane commands: MCP reconnect/toggle, session titling/renaming, task stop/backgrounding, and flag settings

   Remote control connections can now reconnect/toggle MCP servers, rename sessions, stop tasks, and set effort/ultracode flags

   found in this entry's text

7. v2.1.268 10 Sep 2026
   Internal codename 'Ultracode' revealed for the workflow-keyword trigger setting

   The setting that lets the word 'ultracode' start a workflow is now labeled 'Ultracode keyword trigger' in settings

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

8. v2.1.263 6 Sep 2026
   Effort-switch dialog gains an "ultracode" awareness check

   An internal ultracode-mode check can now silently suppress the effort-switch nudge.

   found in this entry's text

9. v2.1.257 1 Sep 2026
   Ultracode effort now explicitly clears/holds the launch-effort pin

   Choosing ultracode effort now unpins the launch-effort lock or hard-stops, changing when the pin-blocked message appears.

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

10. v2.1.248 27 Aug 2026
    Reasoning effort levels and their aliases

    Reasoning effort accepts low through max, with med and ultracode as aliases.

    found in this entry's text

11. v2.1.234 17 Aug 2026
    Remote Control can read and change the session's effort level and ultracode

    A remote client driving your session can now see and change effort level and toggle ultracode.

    found in this entry's text

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.

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 settings key does. All settings keys.