Agents: safeguard compaction summarization

src/config/config.test.ts

@@ -522,6 +522,7 @@ describe("config compaction settings", () => {
             agents: {
               defaults: {
                 compaction: {
+                  mode: "safeguard",
                   reserveTokensFloor: 12_345,
                   memoryFlush: {
                     enabled: false,
@@ -544,6 +545,7 @@ describe("config compaction settings", () => {
       const cfg = loadConfig();
 
       expect(cfg.agents?.defaults?.compaction?.reserveTokensFloor).toBe(12_345);
+      expect(cfg.agents?.defaults?.compaction?.mode).toBe("safeguard");
       expect(cfg.agents?.defaults?.compaction?.memoryFlush?.enabled).toBe(
         false,
       );

src/config/types.ts

@@ -1716,7 +1716,11 @@ export type AgentDefaultsConfig = {
   };
 };
 
+export type AgentCompactionMode = "default" | "safeguard";
+
 export type AgentCompactionConfig = {
+  /** Compaction summarization mode. */
+  mode?: AgentCompactionMode;
   /** Minimum reserve tokens enforced for Pi compaction (0 disables the floor). */
   reserveTokensFloor?: number;
   /** Pre-compaction memory flush (agentic turn). Default: enabled. */

src/config/zod-schema.ts

@@ -1210,6 +1210,7 @@ const AgentDefaultsSchema = z
       .optional(),
     compaction: z
       .object({
+        mode: z.union([z.literal("default"), z.literal("safeguard")]).optional(),
         reserveTokensFloor: z.number().int().nonnegative().optional(),
         memoryFlush: z
           .object({