Which models get the simple system prompt is now decided locally, not by remote config.
tengu_velvet_cascade Not enough to sayNothing here resolved what this flag was doing on this version, so nothing here should be read as on or off.
This account: no value returned · anonymous baseline: no value returned · compiled default in v2.1.227: not a boolean we can read
These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.
tengu_velvet_tide Off in both readingsThe flag server returned off for the account this site reads and for the anonymous baseline. A reading of off cannot rule out a rollout these two readings sit outside of.
This account: off · anonymous baseline: off · compiled default in v2.1.227: on
These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.
Read once, for one account on one subscription tier, against v2.1.227. It isn't a statement about your account. What a flag value here can and cannot tell you
What's wrong with this entry?
The tengu_velvet_cascade remote config, a JSON object listing models that should use the simple system prompt, is gone from the build. The choice now rests on the per-model capability entry, the CLAUDE_CODE_SIMPLE_SYSTEM_PROMPT environment variable, and the existing tengu_velvet_tide escape hatch.
tengu_velvet_cascade
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
Related
Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.
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v2.1.219
Opus 5 gets an extra system-prompt instruction restricting AgentTool, workflows and deep-research
Both mention system prompt
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v2.1.219
Opus 5 carries an extra system-prompt block and suppresses subagent nudges
Both mention system prompt
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v2.1.229
Bash tool prompt always carries the full git commit instructions
Both mention system prompt