/effort
A Claude Code slash command, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.
Set the effort level: low to xhigh, max, ultracode, or auto; status prints it. max and ultracode are session-only; the ultracode key persists. Run it while Claude is responding and, once you confirm the cache warning, if Claude Code shows one, Claude Code applies the new level to the next request in that turn. Before v2.1.242, Claude Code decided from a feature flag it fetched from Anthropic whether to run the command mid-turn or queue it until the turn finished, and always queued it in a session that doesn't fetch feature flags, such as on a third-party provider. Works in -p
Anthropic's own wording. Read off Commands, captured 2026-09-28.
In the changelogs
26Releases whose published page names /effort.
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v2.1.305
Usage reports can carry recommendations and a fix that sends commands for you
The usage report format now allows a list of recommended changes and a fix that sends messages,
/effortfirst, on your behalffound in this entry's text, named in this entry
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v2.1.299
/effortand/fastnow work in agent viewIn agent view,
/effortand/fastnow take effect instead of telling you to attach to a sessionfound in this entry's text, named in this entry
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v2.1.299
Usage breakdown gives advice on four more cost drivers
The usage breakdown now flags max effort, workflows, always-on context over 40k tokens and tool results over 10k tokens, with advice
found in this entry's text
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v2.1.290
Remote Control users can run /effort, /model, /rename and /usage while Claude is working
Someone connected through Remote Control can now run
/effort,/model,/renameand/usagestraight away while Claude is mid-replyfound in this entry's text, named in this entry
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v2.1.290
Usage data for /effort now records the previous level and route
When you run /effort, the usage data Claude Code sends now also records the level you changed from and the route taken
found in this entry's text
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v2.1.290
/code-review mediumnow runs the high-effort recipe on most modelsOn every model without its own
/code-reviewrow, Opus 5.5 included,mediumnow runs the eight-angle high recipe instead of a single pass.high,xhighand Opus 5 are unchanged.found in this entry's text
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v2.1.284
/effortno longer starts on ultracode when you open itThe
/effortpicker no longer jumps to ultracode as its first selection when ultracode is onfound in this entry's text, named in this entry
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v2.1.284
Ultracode is now an on/off switch that works with any effort level
Ultracode is no longer an effort level that forces xhigh; you turn it on or off with
/effort ultracode onorofffound in this entry's text
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v2.1.282
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
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v2.1.280
New "max effort" mode with /effort command
A new "max effort" mode appears with a footer hint pointing to the /effort command
found in this entry's text, named in this entry
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v2.1.280
Max-effort reminder UI, gated off by default
A new reminder can appear in the status line when effort is set to max, pointing you to /effort to change it
found in this entry's text, named in this entry
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v2.1.277
update_settings tool can now target more than localSettings, including userSettings.effortLevel
The internal update_settings tool can now write userSettings.effortLevel, not just localSettings
found in this entry's text
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v2.1.267
Effort computation now factors in turnEffort from permission layers
Claude Code's effort-level calculation now also factors in an extra turnEffort value derived from active permission layers
found in this entry's text
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v2.1.267
Per-model "maxEffortLevel" cap now enforced client-side across settings
maxEffortLevel now combines a global cap with per-model overrides across all settings files and clamps any explicit effort request
found in this entry's text
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v2.1.251
Organization default effort level is now shown
/effort now tells you when your organization set the default effort level.
named in this entry, found in this entry's text
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v2.1.195
Effort Levels Now Enforced Per-Organization
found in this entry's text
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v2.1.136
Broader
/effort maxDocumentationfound in this entry's text
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v2.1.126
/effortselections are now persisted to user settingsfound in this entry's text
- v2.1.126
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v2.1.124
Effort command no longer error-spams
found in this entry's text
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v2.1.116
Updated Opus 4.7 Welcome Message
found in this entry's text
- v2.1.111
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v2.1.111
New "xhigh" Effort Level
found in this entry's text
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v2.1.111
Interactive Effort Level Selector
found in this entry's text
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v2.1.91
Rate Limit Reduction Suggestions [Gradual Rollout]
found in this entry's text
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v2.1.76
/effortSlash Commandfound in this entry's text
First cited
2The earliest release whose published evidence quoted /effort was v2.1.282, 24 Sep 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
0The miner has never read a build containing this name. It is here because a changelog entry of ours names it, which is evidence that it existed and not evidence of which releases carried it. The inventory starts at v2.1.138 and everything older than that was never mined.
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 slash command does. All slash commands.