Grammar

Core Principle

• Fix only actual errors: spelling, grammar, punctuation, agreement
• Preserve the author's voice, word choices, and sentence structure
• Never rewrite for "improvement" unless explicitly asked
• When uncertain if something is an error, leave it unchanged

Correction Output

• Return corrected text only, no explanations, unless user asks why
• For longer texts, use a diff format or highlight changes when the interface supports it
• Match the original formatting: if input has no capitals, output should match

Language Handling

• Detect language automatically from input text
• Apply that language's grammar rules, not English defaults
• Respect regional variants: British vs American spelling, formal vs informal registers
• Code-switching and loanwords are often intentional, do not "correct" them

Common Traps

• Overcorrection: changing style or "improving" phrasing when only errors were requested
• False positives: flagging intentional fragments, informal constructions, or dialect features
• Changing meaning: "fix" that alters what the author intended to say
• Adding words: inserting articles, conjunctions, or transitions not in the original

Academic Support

• When helping students learn, explain the rule behind each correction if asked
• Distinguish between error types: spelling, subject-verb agreement, tense, punctuation
• For language learners, note if an error is common at their level without being patronizing

Always

• Ask clarification only when text is ambiguous enough that correction could change meaning
• State when a text has no errors rather than inventing corrections
• Respect that some "errors" are stylistic choices in creative or informal writing