fix(runner): avoid duplicate system prompt on new OpenClaw

index.ts

@@ -129,7 +129,7 @@ function sweepStaleCaches(): void {
 
 export default function register(api: OpenClawPluginApi) {
   pluginStartTimestamp = Date.now();
-  setPreferredEmbeddedAgentRuntime(api.runtime.agent);
+  setPreferredEmbeddedAgentRuntime(api.runtime.agent, (api.runtime as any)?.version);
   // Reset reporter singleton so config changes take effect on hot-reload.
   resetReporter();
   const _require = createRequire(import.meta.url);

package.json

@@ -34,14 +34,12 @@
   "files": [
     "dist/",
     "bin/",
-    "index.ts",
     "scripts/migrate-sqlite-to-tcvdb/dist/",
     "scripts/export-tencent-vdb/dist/",
     "scripts/read-local-memory/dist/",
     "scripts/memory-tencentdb-ctl.sh",
     "scripts/install_hermes_memory_tencentdb.sh",
     "scripts/README.memory-tencentdb-ctl.md",
-    "src/",
     "scripts/openclaw-after-tool-call-messages.patch.sh",
     "scripts/setup-offload.sh",
     "hermes-plugin/",

src/utils/clean-context-runner.test.ts

@@ -0,0 +1,20 @@
+import { describe, expect, it } from "vitest";
+
+import { shouldPassExtraSystemPrompt } from "./clean-context-runner.js";
+
+describe("shouldPassExtraSystemPrompt", () => {
+  it("keeps the legacy fallback when the OpenClaw version is unknown", () => {
+    expect(shouldPassExtraSystemPrompt(undefined)).toBe(true);
+    expect(shouldPassExtraSystemPrompt("unknown")).toBe(true);
+  });
+
+  it("keeps the fallback for OpenClaw versions before 2026.4.7", () => {
+    expect(shouldPassExtraSystemPrompt("2026.4.6")).toBe(true);
+  });
+
+  it("omits the fallback for OpenClaw versions that support systemPromptOverride", () => {
+    expect(shouldPassExtraSystemPrompt("2026.4.7")).toBe(false);
+    expect(shouldPassExtraSystemPrompt("2026.4.7-beta.1")).toBe(false);
+    expect(shouldPassExtraSystemPrompt("2026.5.20")).toBe(false);
+  });
+});

src/utils/clean-context-runner.ts

@@ -65,11 +65,34 @@ export interface EmbeddedAgentRuntimeLike {
 }
 
 let _preferredAgentRuntime: EmbeddedAgentRuntimeLike | undefined;
+let _preferredOpenClawVersion: unknown;
 
 export function setPreferredEmbeddedAgentRuntime(
   agentRuntime: EmbeddedAgentRuntimeLike | undefined,
+  openClawVersion?: unknown,
 ): void {
   _preferredAgentRuntime = agentRuntime;
+  _preferredOpenClawVersion = openClawVersion;
+}
+
+export function shouldPassExtraSystemPrompt(openClawVersion: unknown): boolean {
+  const parsed = parseVersionXYZ(openClawVersion);
+  if (!parsed) return true;
+  return compareVersionXYZ(parsed, [2026, 4, 7]) < 0;
+}
+
+function parseVersionXYZ(v: unknown): [number, number, number] | null {
+  if (typeof v !== "string") return null;
+  const m = v.match(/^(\d+)\.(\d+)\.(\d+)(?:[-.].*)?$/);
+  if (!m) return null;
+  return [Number(m[1]), Number(m[2]), Number(m[3])];
+}
+
+function compareVersionXYZ(
+  a: readonly [number, number, number],
+  b: readonly [number, number, number],
+): number {
+  return a[0] - b[0] || a[1] - b[1] || a[2] - b[2];
 }
 
 function resolveInjectedRunEmbeddedPiAgent(
@@ -439,12 +462,15 @@ export class CleanContextRunner {
 
       // Phase 2: Embedded agent run (LLM call + tool calls)
       const agentStartMs = Date.now();
-      // extraSystemPrompt: fallback for openclaw < 2026.4.7 which does not support
-      // config.agents.defaults.systemPromptOverride. On newer versions the
-      // override takes precedence and this becomes a no-op append.
+      // extraSystemPrompt is only needed for old OpenClaw builds that do not
+      // support config.agents.defaults.systemPromptOverride. Newer builds append
+      // it after the override, duplicating the full system prompt.
       const effectiveSystemPrompt =
         params.systemPrompt ||
         "You are a precise data extraction and generation assistant. Follow the user instructions exactly. Respond only with the requested output format.";
+      const extraSystemPrompt = shouldPassExtraSystemPrompt(_preferredOpenClawVersion)
+        ? effectiveSystemPrompt
+        : undefined;
       const result = await runEmbeddedPiAgent({
         sessionId,
         sessionFile,
@@ -460,7 +486,7 @@ export class CleanContextRunner {
         // Instead rely on cleanConfig.tools.allow to restrict the tool set
         // to a minimal read-only tool (when enableTools=false).
         disableTools: false,
-        extraSystemPrompt: effectiveSystemPrompt,
+        ...(extraSystemPrompt ? { extraSystemPrompt } : {}),
         streamParams: {
           maxTokens: params.maxTokens,
         },