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Claude Code's Auto Mode is quietly steering the model away from Read/Edit/Write and toward shell commands
A user pasted the Auto Mode system-reminder verbatim, which instructs the model to read files with cat, head and sed -n, search with grep and find, and edit with sed and heredocs, falling back to the built-in tools only when Bash cannot do the job. An Anthropic employee replied in a personal capacity that the likely reason is token cost: Edit requires the full block and full replacement, and fails and retries when the match is not unique, whereas command-line work is something the model has seen far more of. Neither the change nor its rationale appears in release notes.
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