fix(discord): Apply historyLimit to channel/group sessions to prevent compaction bypass (openclaw#11356) thanks @shadril238

Verified:
- pnpm build
- pnpm check
- pnpm test (ran; one unrelated existing failure in models forward-compat test)
- pnpm vitest src/agents/pi-embedded-runner.history-limit-from-session-key.test.ts

Co-authored-by: shadril238 <63901551+shadril238@users.noreply.github.com>
Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>

CHANGELOG.md

@@ -17,6 +17,7 @@ Docs: https://docs.openclaw.ai
 - CLI: lazily load outbound provider dependencies and remove forced success-path exits so commands terminate naturally without killing intentional long-running foreground actions. (#12906) Thanks @DrCrinkle.
 - Clawdock: avoid Zsh readonly variable collisions in helper scripts. (#15501) Thanks @nkelner.
 - Discord: route autoThread replies to existing threads instead of the root channel. (#8302) Thanks @gavinbmoore, @thewilloftheshadow.
+- Discord/Agents: apply channel/group `historyLimit` during embedded-runner history compaction to prevent long-running channel sessions from bypassing truncation and overflowing context windows. (#11224) Thanks @shadril238.
 - Agents/Image tool: cap image-analysis completion `maxTokens` by model capability (`min(4096, model.maxTokens)`) to avoid over-limit provider failures while still preventing truncation. (#11770) Thanks @detecti1.
 - TUI/Streaming: preserve richer streamed assistant text when final payload drops pre-tool-call text blocks, while keeping non-empty final payload authoritative for plain-text updates. (#15452) Thanks @TsekaLuk.
 - Inbound/Web UI: preserve literal `\n` sequences when normalizing inbound text so Windows paths like `C:\\Work\\nxxx\\README.md` are not corrupted. (#11547) Thanks @mcaxtr.

src/agents/pi-embedded-runner.get-dm-history-limit-from-session-key.returns-undefined-sessionkey-is-undefined.e2e.test.ts

@@ -143,14 +143,23 @@ describe("getDmHistoryLimitFromSessionKey", () => {
       9,
     );
   });
-  it("returns undefined for non-dm session kinds", () => {
+  it("returns historyLimit for channel session kinds when configured", () => {
     const config = {
       channels: {
-        telegram: { dmHistoryLimit: 15 },
-        slack: { dmHistoryLimit: 10 },
+        slack: { historyLimit: 10, dmHistoryLimit: 15 },
+        discord: { historyLimit: 8 },
       },
     } as OpenClawConfig;
-    expect(getDmHistoryLimitFromSessionKey("agent:beta:slack:channel:c1", config)).toBeUndefined();
+    expect(getDmHistoryLimitFromSessionKey("agent:beta:slack:channel:c1", config)).toBe(10);
+    expect(getDmHistoryLimitFromSessionKey("discord:channel:123456", config)).toBe(8);
+  });
+  it("returns undefined for non-dm/channel/group session kinds", () => {
+    const config = {
+      channels: {
+        telegram: { dmHistoryLimit: 15, historyLimit: 10 },
+      },
+    } as OpenClawConfig;
+    // "slash" is not dm, channel, or group
     expect(getDmHistoryLimitFromSessionKey("telegram:slash:123", config)).toBeUndefined();
   });
   it("returns undefined for unknown provider", () => {
@@ -228,6 +237,46 @@ describe("getDmHistoryLimitFromSessionKey", () => {
     } as OpenClawConfig;
     expect(getDmHistoryLimitFromSessionKey("telegram:dm:123", config)).toBe(5);
   });
+  it("returns historyLimit for channel sessions for all providers", () => {
+    const providers = [
+      "telegram",
+      "whatsapp",
+      "discord",
+      "slack",
+      "signal",
+      "imessage",
+      "msteams",
+      "nextcloud-talk",
+    ] as const;
+
+    for (const provider of providers) {
+      const config = {
+        channels: { [provider]: { historyLimit: 12 } },
+      } as OpenClawConfig;
+      expect(getDmHistoryLimitFromSessionKey(`${provider}:channel:123`, config)).toBe(12);
+      expect(getDmHistoryLimitFromSessionKey(`agent:main:${provider}:channel:456`, config)).toBe(
+        12,
+      );
+    }
+  });
+  it("returns historyLimit for group sessions", () => {
+    const config = {
+      channels: {
+        discord: { historyLimit: 15 },
+        slack: { historyLimit: 10 },
+      },
+    } as OpenClawConfig;
+    expect(getDmHistoryLimitFromSessionKey("discord:group:123", config)).toBe(15);
+    expect(getDmHistoryLimitFromSessionKey("agent:main:slack:group:abc", config)).toBe(10);
+  });
+  it("returns undefined for channel sessions when historyLimit is not configured", () => {
+    const config = {
+      channels: {
+        discord: { dmHistoryLimit: 10 }, // only dmHistoryLimit, no historyLimit
+      },
+    } as OpenClawConfig;
+    expect(getDmHistoryLimitFromSessionKey("discord:channel:123", config)).toBeUndefined();
+  });
 
   describe("backward compatibility", () => {
     it("accepts both legacy :dm: and new :direct: session keys", () => {

src/agents/pi-embedded-runner.history-limit-from-session-key.test.ts

@@ -0,0 +1,31 @@
+import { describe, expect, it } from "vitest";
+import type { OpenClawConfig } from "../config/config.js";
+import { getDmHistoryLimitFromSessionKey } from "./pi-embedded-runner.js";
+
+describe("getDmHistoryLimitFromSessionKey", () => {
+  it("keeps backward compatibility for dm/direct session kinds", () => {
+    const config = {
+      channels: { telegram: { dmHistoryLimit: 10 } },
+    } as OpenClawConfig;
+
+    expect(getDmHistoryLimitFromSessionKey("telegram:dm:123", config)).toBe(10);
+    expect(getDmHistoryLimitFromSessionKey("telegram:direct:123", config)).toBe(10);
+  });
+
+  it("returns historyLimit for channel and group session kinds", () => {
+    const config = {
+      channels: { discord: { historyLimit: 12, dmHistoryLimit: 5 } },
+    } as OpenClawConfig;
+
+    expect(getDmHistoryLimitFromSessionKey("discord:channel:123", config)).toBe(12);
+    expect(getDmHistoryLimitFromSessionKey("discord:group:456", config)).toBe(12);
+  });
+
+  it("returns undefined for unsupported session kinds", () => {
+    const config = {
+      channels: { discord: { historyLimit: 12, dmHistoryLimit: 5 } },
+    } as OpenClawConfig;
+
+    expect(getDmHistoryLimitFromSessionKey("discord:slash:123", config)).toBeUndefined();
+  });
+});

src/agents/pi-embedded-runner.ts

@@ -5,6 +5,7 @@ export { applyExtraParamsToAgent, resolveExtraParams } from "./pi-embedded-runne
 export { applyGoogleTurnOrderingFix } from "./pi-embedded-runner/google.js";
 export {
   getDmHistoryLimitFromSessionKey,
+  getHistoryLimitFromSessionKey,
   limitHistoryTurns,
 } from "./pi-embedded-runner/history.js";
 export { resolveEmbeddedSessionLane } from "./pi-embedded-runner/lanes.js";

src/agents/pi-embedded-runner/history.ts

@@ -38,8 +38,9 @@ export function limitHistoryTurns(
 /**
  * Extract provider + user ID from a session key and look up dmHistoryLimit.
  * Supports per-DM overrides and provider defaults.
+ * For channel/group sessions, uses historyLimit from provider config.
  */
-export function getDmHistoryLimitFromSessionKey(
+export function getHistoryLimitFromSessionKey(
   sessionKey: string | undefined,
   config: OpenClawConfig | undefined,
 ): number | undefined {
@@ -58,32 +59,17 @@ export function getDmHistoryLimitFromSessionKey(
   const kind = providerParts[1]?.toLowerCase();
   const userIdRaw = providerParts.slice(2).join(":");
   const userId = stripThreadSuffix(userIdRaw);
-  // Accept both "direct" (new) and "dm" (legacy) for backward compat
-  if (kind !== "direct" && kind !== "dm") {
-    return undefined;
-  }
-
-  const getLimit = (
-    providerConfig:
-      | {
-          dmHistoryLimit?: number;
-          dms?: Record<string, { historyLimit?: number }>;
-        }
-      | undefined,
-  ): number | undefined => {
-    if (!providerConfig) {
-      return undefined;
-    }
-    if (userId && providerConfig.dms?.[userId]?.historyLimit !== undefined) {
-      return providerConfig.dms[userId].historyLimit;
-    }
-    return providerConfig.dmHistoryLimit;
-  };
 
   const resolveProviderConfig = (
     cfg: OpenClawConfig | undefined,
     providerId: string,
-  ): { dmHistoryLimit?: number; dms?: Record<string, { historyLimit?: number }> } | undefined => {
+  ):
+    | {
+        historyLimit?: number;
+        dmHistoryLimit?: number;
+        dms?: Record<string, { historyLimit?: number }>;
+      }
+    | undefined => {
     const channels = cfg?.channels;
     if (!channels || typeof channels !== "object") {
       return undefined;
@@ -92,8 +78,38 @@ export function getDmHistoryLimitFromSessionKey(
     if (!entry || typeof entry !== "object" || Array.isArray(entry)) {
       return undefined;
     }
-    return entry as { dmHistoryLimit?: number; dms?: Record<string, { historyLimit?: number }> };
+    return entry as {
+      historyLimit?: number;
+      dmHistoryLimit?: number;
+      dms?: Record<string, { historyLimit?: number }>;
+    };
   };
 
-  return getLimit(resolveProviderConfig(config, provider));
+  const providerConfig = resolveProviderConfig(config, provider);
+  if (!providerConfig) {
+    return undefined;
+  }
+
+  // For DM sessions: per-DM override -> dmHistoryLimit.
+  // Accept both "direct" (new) and "dm" (legacy) for backward compat.
+  if (kind === "dm" || kind === "direct") {
+    if (userId && providerConfig.dms?.[userId]?.historyLimit !== undefined) {
+      return providerConfig.dms[userId].historyLimit;
+    }
+    return providerConfig.dmHistoryLimit;
+  }
+
+  // For channel/group sessions: use historyLimit from provider config
+  // This prevents context overflow in long-running channel sessions
+  if (kind === "channel" || kind === "group") {
+    return providerConfig.historyLimit;
+  }
+
+  return undefined;
 }
+
+/**
+ * @deprecated Use getHistoryLimitFromSessionKey instead.
+ * Alias for backward compatibility.
+ */
+export const getDmHistoryLimitFromSessionKey = getHistoryLimitFromSessionKey;