Claude Code's Monitor tool writes copy in full Opus style, even on Sonnet
firasd · x · 2026-11-14
A developer noticed Claude Code's Monitor tool emits distinctly Opus-flavored boilerplate when a watch times out: "Re-arm it if you still need the watch — and widen the filter if silence was unexpected." Joking that "Opus is everywhere," he learned the line isn't from the driving model at all — it's harness boilerplate that ships with the Monitor tool regardless of which model runs it. The session was actually on Sonnet 5.5, whose model clarified the text was "evidently written by a model with strong opinions about em-dashes." A fun glimpse at how tool copy in agent harnesses is decoupled from the underlying model.
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