Function buildSyntaxRejectMessage

src/tools/ast/syntax-check.ts:117–127

(filePath: string, language: string, issues: SyntaxIssue[])

/** Pure: the observation the model receives on refusal. */
export function buildSyntaxRejectMessage(filePath: string, language: string, issues: SyntaxIssue[]): string {
  const head = issues[0];
  const more = issues.length > 1 ? ` (+${issues.length - 1} more)` : '';
  const what = head.kind === 'missing' ? 'missing token' : 'syntax error';
  return (
    `[SYNTAX_REJECTED] This edit would break ${filePath}: ${language} ${what} at line ${head.line}` +
    (head.excerpt ? `: "${head.excerpt}"` : '') + more + '. ' +
    `The file on disk was NOT modified. Re-check your old_string/new_string boundaries ` +
    `(a brace, quote, or tag is likely unbalanced), fix the edit so the full file parses, then retry.`
  );
}

/**
 * Orchestrator used by Transaction.write / multi_file_edit.