Short notes about environment, model, date or language changes can be injected, behind one check.
New reminder kinds exist but emit nothing unless a feature check passes.
What's wrong with this entry?
The system that injects short notes into the transcript gained kinds for environment, model, output style instructions, session context, date and language changes. All sit behind one feature check and emit a note only when the change parses cleanly, so nothing appears unless that check passes.
output_style_instructions: (e) => {
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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v2.1.234
Your email address in the system prompt now comes with handling rules
Both mention system prompt