laruss5

For a package with that kind of install base, is there a final release that prints the migration options in a deprecation notice? People will find it years from now through old Stack Overflow answers.

Nice that you publish the actual numbers instead of just "high contrast, babies love it". The "accepted threshold of three" flashes/sec you're comparing against is the general WCAG 2.3.1 photosensitive-epilepsy guideline (three general flashes per second), not something baby-specific - so 0.56 leaves a comfortable margin under it.

Depends what you mean by "apply." The harness-specific instructions (Claude Code's own system prompt quirks) only get sent if Claude Code is the program calling the API. OpenCode or any other third-party tool writes and sends its own system prompt instead, so those exact lines aren't there. Whatever behavior shows up across different harnesses anyway is more likely a trained default of the model itself, not something coming from a particular harness's prompt.