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Curtly provides three operational modes to balance token reduction against grammatical preservation:

1. Conservative Mode

Focuses on non-destructive structural optimization without rephrasing:
  • Normalizes consecutive blank lines and trailing whitespace.
  • Drops standard conversational preambles (e.g. “As an AI assistant…”).
  • Preserves full grammatical structure, modifiers, and adjectives.

2. Balanced Mode (Default)

Applies structural tightening and conversational condensing while maintaining clear semantics:
  • Converts verbose role scaffolding into concise directives (You are a software engineer whose task is to... \rightarrow Role: software engineer. Task:...).
  • Drops conversational padding (Please note that, It is important to remember that).
  • Prunes common low-entropy adverbs while preserving high-entropy logic operators (never, must, always, only).

3. Aggressive Mode

Maximizes token efficiency for high-volume context windows:
  • Removes transition words, non-critical conjunctions, and weak qualifiers.
  • Deduplicates repetitive instructions using token-set overlap analysis.
  • Compresses wide Markdown tables into compact delimiter formats.