BREAKING CHANGE(api): Migrate public API to ai-sdk v6 and refactor core agent architecture: replace class-based DualAgent/Driver/Guardian with a single runAgent function; introduce ts_tools factories for tools, a compactMessages compaction subpath, and truncateOutput utility; simplify ToolRegistry to return ToolSet and remove legacy BaseToolWrapper/tool classes; update package exports and dependencies and bump major version.

ts/smartagent.utils.truncation.ts

@@ -0,0 +1,39 @@
+// Truncation logic derived from opencode (MIT) — https://github.com/sst/opencode
+
+const MAX_LINES = 2000;
+const MAX_BYTES = 50 * 1024; // 50 KB
+
+export interface ITruncateResult {
+  content: string;
+  truncated: boolean;
+  /** Set when truncated: describes what was dropped */
+  notice?: string;
+}
+
+export function truncateOutput(
+  text: string,
+  options?: { maxLines?: number; maxBytes?: number },
+): ITruncateResult {
+  const maxLines = options?.maxLines ?? MAX_LINES;
+  const maxBytes = options?.maxBytes ?? MAX_BYTES;
+  const lines = text.split('\n');
+  const totalBytes = Buffer.byteLength(text, 'utf-8');
+
+  if (lines.length <= maxLines && totalBytes <= maxBytes) {
+    return { content: text, truncated: false };
+  }
+
+  const out: string[] = [];
+  let bytes = 0;
+  for (let i = 0; i < lines.length && i < maxLines; i++) {
+    const size = Buffer.byteLength(lines[i], 'utf-8') + (i > 0 ? 1 : 0);
+    if (bytes + size > maxBytes) break;
+    out.push(lines[i]);
+    bytes += size;
+  }
+
+  const kept = out.length;
+  const dropped = lines.length - kept;
+  const notice = `\n[Output truncated: showing ${kept}/${lines.length} lines. ${dropped} lines omitted.]`;
+  return { content: out.join('\n') + notice, truncated: true, notice };
+}