feat: add pre-compaction memory flush

src/agents/pi-embedded-runner.ts

@@ -73,7 +73,10 @@ import {
 import { normalizeModelCompat } from "./model-compat.js";
 import { ensureClawdbotModelsJson } from "./models-config.js";
 import type { MessagingToolSend } from "./pi-embedded-messaging.js";
-import { ensurePiCompactionReserveTokens } from "./pi-settings.js";
+import {
+  ensurePiCompactionReserveTokens,
+  resolveCompactionReserveTokensFloor,
+} from "./pi-settings.js";
 import { acquireSessionWriteLock } from "./session-write-lock.js";
 
 export type { MessagingToolSend } from "./pi-embedded-messaging.js";
@@ -1184,7 +1187,12 @@ export async function compactEmbeddedPiSession(params: {
             effectiveWorkspace,
             agentDir,
           );
-          ensurePiCompactionReserveTokens({ settingsManager });
+          ensurePiCompactionReserveTokens({
+            settingsManager,
+            minReserveTokens: resolveCompactionReserveTokensFloor(
+              params.config,
+            ),
+          });
           const additionalExtensionPaths = buildEmbeddedExtensionPaths({
             cfg: params.config,
             sessionManager,
@@ -1584,7 +1592,12 @@ export async function runEmbeddedPiAgent(params: {
             effectiveWorkspace,
             agentDir,
           );
-          ensurePiCompactionReserveTokens({ settingsManager });
+          ensurePiCompactionReserveTokens({
+            settingsManager,
+            minReserveTokens: resolveCompactionReserveTokensFloor(
+              params.config,
+            ),
+          });
           const additionalExtensionPaths = buildEmbeddedExtensionPaths({
             cfg: params.config,
             sessionManager,

src/agents/pi-settings.test.ts

@@ -3,6 +3,7 @@ import { describe, expect, it, vi } from "vitest";
 import {
   DEFAULT_PI_COMPACTION_RESERVE_TOKENS_FLOOR,
   ensurePiCompactionReserveTokens,
+  resolveCompactionReserveTokensFloor,
 } from "./pi-settings.js";
 
 describe("ensurePiCompactionReserveTokens", () => {
@@ -35,3 +36,24 @@ describe("ensurePiCompactionReserveTokens", () => {
     expect(settingsManager.applyOverrides).not.toHaveBeenCalled();
   });
 });
+
+describe("resolveCompactionReserveTokensFloor", () => {
+  it("returns the default when config is missing", () => {
+    expect(resolveCompactionReserveTokensFloor()).toBe(
+      DEFAULT_PI_COMPACTION_RESERVE_TOKENS_FLOOR,
+    );
+  });
+
+  it("accepts configured floors, including zero", () => {
+    expect(
+      resolveCompactionReserveTokensFloor({
+        agents: { defaults: { compaction: { reserveTokensFloor: 24_000 } } },
+      }),
+    ).toBe(24_000);
+    expect(
+      resolveCompactionReserveTokensFloor({
+        agents: { defaults: { compaction: { reserveTokensFloor: 0 } } },
+      }),
+    ).toBe(0);
+  });
+});

src/agents/pi-settings.ts

@@ -1,3 +1,5 @@
+import type { ClawdbotConfig } from "../config/config.js";
+
 export const DEFAULT_PI_COMPACTION_RESERVE_TOKENS_FLOOR = 20_000;
 
 type PiSettingsManagerLike = {
@@ -25,3 +27,13 @@ export function ensurePiCompactionReserveTokens(params: {
 
   return { didOverride: true, reserveTokens: minReserveTokens };
 }
+
+export function resolveCompactionReserveTokensFloor(
+  cfg?: ClawdbotConfig,
+): number {
+  const raw = cfg?.agents?.defaults?.compaction?.reserveTokensFloor;
+  if (typeof raw === "number" && Number.isFinite(raw) && raw >= 0) {
+    return Math.floor(raw);
+  }
+  return DEFAULT_PI_COMPACTION_RESERVE_TOKENS_FLOOR;
+}