feat: enable adaptive context pruning by default

src/config/config.test.ts

@@ -269,7 +269,7 @@ describe("config identity defaults", () => {
     });
   });
 
-  it("does not synthesize agent/session when absent", async () => {
+  it("does not synthesize session when absent", async () => {
     await withTempHome(async (home) => {
       const configDir = path.join(home, ".clawdbot");
       await fs.mkdir(configDir, { recursive: true });
@@ -295,7 +295,7 @@ describe("config identity defaults", () => {
       expect(cfg.routing?.groupChat?.mentionPatterns).toEqual([
         "\\b@?Samantha\\b",
       ]);
-      expect(cfg.agent).toBeUndefined();
+      expect(cfg.agent?.contextPruning?.mode).toBe("adaptive");
       expect(cfg.session).toBeUndefined();
     });
   });
@@ -327,6 +327,48 @@ describe("config identity defaults", () => {
   });
 });
 
+describe("config pruning defaults", () => {
+  it("defaults contextPruning mode to adaptive", async () => {
+    await withTempHome(async (home) => {
+      const configDir = path.join(home, ".clawdbot");
+      await fs.mkdir(configDir, { recursive: true });
+      await fs.writeFile(
+        path.join(configDir, "clawdbot.json"),
+        JSON.stringify({ agent: {} }, null, 2),
+        "utf-8",
+      );
+
+      vi.resetModules();
+      const { loadConfig } = await import("./config.js");
+      const cfg = loadConfig();
+
+      expect(cfg.agent?.contextPruning?.mode).toBe("adaptive");
+    });
+  });
+
+  it("does not override explicit contextPruning mode", async () => {
+    await withTempHome(async (home) => {
+      const configDir = path.join(home, ".clawdbot");
+      await fs.mkdir(configDir, { recursive: true });
+      await fs.writeFile(
+        path.join(configDir, "clawdbot.json"),
+        JSON.stringify(
+          { agent: { contextPruning: { mode: "off" } } },
+          null,
+          2,
+        ),
+        "utf-8",
+      );
+
+      vi.resetModules();
+      const { loadConfig } = await import("./config.js");
+      const cfg = loadConfig();
+
+      expect(cfg.agent?.contextPruning?.mode).toBe("off");
+    });
+  });
+});
+
 describe("config discord", () => {
   let previousHome: string | undefined;
 

src/config/defaults.ts

@@ -161,6 +161,25 @@ export function applyLoggingDefaults(cfg: ClawdbotConfig): ClawdbotConfig {
   };
 }
 
+export function applyContextPruningDefaults(
+  cfg: ClawdbotConfig,
+): ClawdbotConfig {
+  const agent = cfg.agent;
+  const contextPruning = agent?.contextPruning;
+  if (contextPruning?.mode) return cfg;
+
+  return {
+    ...cfg,
+    agent: {
+      ...agent,
+      contextPruning: {
+        ...contextPruning,
+        mode: "adaptive",
+      },
+    },
+  };
+}
+
 export function resetSessionDefaultsWarningForTests() {
   defaultWarnState = { warned: false };
 }

src/config/io.ts

@@ -17,6 +17,7 @@ import {
   applyLoggingDefaults,
   applyMessageDefaults,
   applyModelDefaults,
+  applyContextPruningDefaults,
   applySessionDefaults,
   applyTalkApiKey,
 } from "./defaults.js";
@@ -135,10 +136,12 @@ export function createConfigIO(overrides: ConfigIoDeps = {}) {
         return {};
       }
       const cfg = applyModelDefaults(
-        applySessionDefaults(
-          applyLoggingDefaults(
-            applyMessageDefaults(
-              applyIdentityDefaults(validated.data as ClawdbotConfig),
+        applyContextPruningDefaults(
+          applySessionDefaults(
+            applyLoggingDefaults(
+              applyMessageDefaults(
+                applyIdentityDefaults(validated.data as ClawdbotConfig),
+              ),
             ),
           ),
         ),
@@ -182,7 +185,11 @@ export function createConfigIO(overrides: ConfigIoDeps = {}) {
     const exists = deps.fs.existsSync(configPath);
     if (!exists) {
       const config = applyTalkApiKey(
-        applyModelDefaults(applySessionDefaults(applyMessageDefaults({}))),
+        applyModelDefaults(
+          applyContextPruningDefaults(
+            applySessionDefaults(applyMessageDefaults({})),
+          ),
+        ),
       );
       const legacyIssues: LegacyConfigIssue[] = [];
       return {