claude resume (without --) silently starts new session instead of warning

Summary

Running claude resume (positional argument) instead of claude --resume (flag) silently starts a new session with the literal word "resume" as the prompt. The user loses all conversation history while filesystem context (cwd, git state) is re-captured fresh — making it look superficially like a resume until the missing thread is noticed.

Expected behavior

One of:

• Warn: Did you mean: claude --resume? and exit non-zero, OR
• Detect the common typo and treat it as --resume with a notice

Actual behavior

A brand-new session starts. No warning, no error. Prior conversation context is silently discarded.

Why it matters

• resume is a natural English word that users type as a positional arg by reflex
• The failure is silent and partially masked (filesystem context re-populates, so it _looks_ like a resume)
• By the time the user realizes their history is gone, the window to --resume back may be lost

Workaround

Shell alias: alias cresume='claude --resume'

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