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_compaction/smartagent.compaction.ts

@@ -0,0 +1,51 @@
+import * as plugins from './plugins.js';
+
+const COMPACTION_PROMPT = `Provide a detailed prompt for continuing our conversation above.
+Focus on information that would be helpful for continuing the conversation, including what we did, what we're doing, which files we're working on, and what we're going to do next.
+The summary that you construct will be used so that another agent can read it and continue the work.
+
+When constructing the summary, try to stick to this template:
+---
+## Goal
+[What goal(s) is the user trying to accomplish?]
+
+## Instructions
+- [What important instructions did the user give you that are relevant]
+
+## Discoveries
+[What notable things were learned during this conversation that would be useful for the next agent to know]
+
+## Accomplished
+[What work has been completed, what work is still in progress, and what work is left?]
+
+## Relevant files / directories
+[A structured list of relevant files that have been read, edited, or created]
+---`;
+
+/**
+ * Compacts a message history into a summary.
+ * Pass this as the onContextOverflow handler in IAgentRunOptions.
+ *
+ * @param model    The same model used by runAgent, or a cheaper small model
+ * @param messages The full message history that overflowed
+ * @returns A minimal ModelMessage[] containing the summary as context
+ */
+export async function compactMessages(
+  model: plugins.LanguageModelV3,
+  messages: plugins.ModelMessage[],
+): Promise<plugins.ModelMessage[]> {
+  const result = await plugins.generateText({
+    model,
+    messages: [
+      ...messages,
+      { role: 'user', content: COMPACTION_PROMPT },
+    ],
+  });
+
+  return [
+    {
+      role: 'user',
+      content: `[Previous conversation summary]\n\n${result.text}\n\n[End of summary. Continue from here.]`,
+    },
+  ];
+}