diff --git a/lib/task-managers/github.ts b/lib/task-managers/github.ts
index 704e4af..a648497 100644
--- a/lib/task-managers/github.ts
+++ b/lib/task-managers/github.ts
@@ -224,6 +224,37 @@ export class GitHubProvider implements TaskManager {
     }
   }
 
+  async getMergedMRUrl(issueId: number): Promise<string | null> {
+    try {
+      const raw = await this.gh([
+        "pr", "list",
+        "--state", "merged",
+        "--json", "number,title,body,url,mergedAt",
+        "--limit", "20",
+      ]);
+      const prs = JSON.parse(raw) as Array<{
+        number: number;
+        title: string;
+        body: string;
+        url: string;
+        mergedAt: string;
+      }>;
+      
+      const pattern = `#${issueId}`;
+      
+      // Find the most recently merged PR that references this issue
+      // PRs are returned in reverse chronological order by default
+      const matchingPr = prs.find(
+        (pr) =>
+          pr.title.includes(pattern) || (pr.body ?? "").includes(pattern),
+      );
+      
+      return matchingPr?.url ?? null;
+    } catch {
+      return null;
+    }
+  }
+
   async addComment(issueId: number, body: string): Promise<void> {
     // Write body to temp file to preserve newlines
     const tempFile = join(tmpdir(), `devclaw-comment-${Date.now()}.md`);
diff --git a/lib/task-managers/gitlab.ts b/lib/task-managers/gitlab.ts
index 6d9ee44..93e6ab6 100644
--- a/lib/task-managers/gitlab.ts
+++ b/lib/task-managers/gitlab.ts
@@ -187,6 +187,38 @@ export class GitLabProvider implements TaskManager {
     }
   }
 
+  async getMergedMRUrl(issueId: number): Promise<string | null> {
+    try {
+      const raw = await this.glab([
+        "mr", "list", "--output", "json", "--state", "merged",
+      ]);
+      const mrs = JSON.parse(raw) as Array<{
+        iid: number;
+        title: string;
+        description: string;
+        web_url: string;
+        merged_at: string;
+      }>;
+      
+      const pattern = `#${issueId}`;
+      
+      // Find the most recently merged MR that references this issue
+      // Sort by merged_at to get the most recent first
+      const matchingMr = mrs
+        .filter(
+          (mr) =>
+            mr.title.includes(pattern) || (mr.description ?? "").includes(pattern),
+        )
+        .sort((a, b) => 
+          new Date(b.merged_at).getTime() - new Date(a.merged_at).getTime()
+        )[0];
+      
+      return matchingMr?.web_url ?? null;
+    } catch {
+      return null;
+    }
+  }
+
   async addComment(issueId: number, body: string): Promise<void> {
     // Write body to temp file to preserve newlines
     const tempFile = join(tmpdir(), `devclaw-comment-${Date.now()}.md`);
diff --git a/lib/task-managers/task-manager.ts b/lib/task-managers/task-manager.ts
index 8b4195f..e23de47 100644
--- a/lib/task-managers/task-manager.ts
+++ b/lib/task-managers/task-manager.ts
@@ -75,6 +75,9 @@ export interface TaskManager {
   /** Check if any merged MR/PR exists for a specific issue. */
   hasMergedMR(issueId: number): Promise<boolean>;
 
+  /** Get the URL of the most recently merged MR/PR for a specific issue. Returns null if not found. */
+  getMergedMRUrl(issueId: number): Promise<string | null>;
+
   /** Add a comment to an issue. */
   addComment(issueId: number, body: string): Promise<void>;
 
diff --git a/lib/tools/task-complete.ts b/lib/tools/task-complete.ts
index 7465901..2801a46 100644
--- a/lib/tools/task-complete.ts
+++ b/lib/tools/task-complete.ts
@@ -57,6 +57,10 @@ export function createTaskCompleteTool(api: OpenClawPluginApi) {
           type: "string",
           description: "Brief summary for group announcement",
         },
+        prUrl: {
+          type: "string",
+          description: "Pull Request or Merge Request URL (optional, auto-detected if not provided)",
+        },
       },
     },
 
@@ -65,6 +69,7 @@ export function createTaskCompleteTool(api: OpenClawPluginApi) {
       const result = params.result as "done" | "pass" | "fail" | "refine" | "blocked";
       const groupId = params.projectGroupId as string;
       const summary = params.summary as string | undefined;
+      let prUrl = params.prUrl as string | undefined;
       const workspaceDir = ctx.workspaceDir;
 
       if (!workspaceDir) {
@@ -133,11 +138,34 @@ export function createTaskCompleteTool(api: OpenClawPluginApi) {
           output.gitPull = `warning: ${(err as Error).message}`;
         }
 
+        // Auto-detect PR/MR URL if not provided
+        if (!prUrl) {
+          try {
+            prUrl = await provider.getMergedMRUrl(issueId) ?? undefined;
+          } catch (err) {
+            // Ignore errors in PR URL detection
+          }
+        }
+
         await deactivateWorker(workspaceDir, groupId, "dev");
         await provider.transitionLabel(issueId, "Doing", "To Test");
 
         output.labelTransition = "Doing → To Test";
-        output.announcement = `✅ DEV done #${issueId}${summary ? ` — ${summary}` : ""}. Moved to QA queue.`;
+        
+        // Build announcement with PR URL if available
+        let announcement = `✅ DEV done #${issueId}`;
+        if (summary) {
+          announcement += ` — ${summary}`;
+        }
+        if (prUrl) {
+          announcement += `\n🔗 PR: ${prUrl}`;
+        }
+        announcement += `. Moved to QA queue.`;
+        
+        output.announcement = announcement;
+        if (prUrl) {
+          output.prUrl = prUrl;
+        }
 
         if (project.autoChain) {
           try {