feat: reuse PR-creator Devin session when addressing Cubic AI reviews (#26683)

* feat: prioritize PR-creator Devin session when addressing Cubic AI reviews

Co-Authored-By: anik@cal.com <adhabal2002@gmail.com>

* fix: always use PR-creator Devin session regardless of status

Co-Authored-By: anik@cal.com <adhabal2002@gmail.com>

* fix: use checkSessionStatus helper for both PR description and comment cases

Co-Authored-By: anik@cal.com <adhabal2002@gmail.com>

* Clarify comment about PR review session check

---------

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

.github/workflows/cubic-devin-review.yml

@@ -46,7 +46,7 @@ jobs:
             
             core.setOutput('has-prompt', 'true');
 
-      - name: Check for existing Devin session from PR comments
+      - name: Check for existing Devin session
         if: steps.extract-prompt.outputs.has-prompt == 'true'
         id: check-session
         uses: actions/github-script@v7
@@ -54,6 +54,41 @@ jobs:
           DEVIN_API_KEY: ${{ secrets.DEVIN_API_KEY }}
         with:
           script: |
+            async function checkSessionStatus(sessionId) {
+              const response = await fetch(`https://api.devin.ai/v1/sessions/${sessionId}`, {
+                headers: {
+                  'Authorization': `Bearer ${process.env.DEVIN_API_KEY}`,
+                  'Content-Type': 'application/json'
+                }
+              });
+              
+              if (!response.ok) {
+                console.log(`Failed to fetch session ${sessionId}: ${response.status}`);
+                return null;
+              }
+              
+              return await response.json();
+            }
+            
+            // If PR was created through Devin, always use that session
+            const prBody = context.payload.pull_request.body || '';
+            const prSessionMatch = prBody.match(/app\.devin\.ai\/sessions\/([a-f0-9-]+)/);
+            
+            if (prSessionMatch) {
+              const sessionId = prSessionMatch[1];
+              console.log(`PR was created by Devin session: ${sessionId}`);
+              
+              const session = await checkSessionStatus(sessionId);
+              if (session) {
+                console.log(`PR creator session status: ${session.status_enum}`);
+                core.exportVariable('EXISTING_SESSION_ID', sessionId);
+                core.exportVariable('SESSION_URL', `https://app.devin.ai/sessions/${sessionId}`);
+                core.setOutput('has-active-session', 'true');
+                return;
+              }
+            }
+            
+            // PR was not created through Devin - check for existing Devin session from PR comments
             const comments = await github.rest.issues.listComments({
               owner: context.repo.owner,
               repo: context.repo.repo,
@@ -79,20 +114,12 @@ jobs:
             
             console.log(`Found session ID from comment: ${sessionId}`);
             
-            const response = await fetch(`https://api.devin.ai/v1/sessions/${sessionId}`, {
-              headers: {
-                'Authorization': `Bearer ${process.env.DEVIN_API_KEY}`,
-                'Content-Type': 'application/json'
-              }
-            });
-            
-            if (!response.ok) {
-              console.log(`Failed to fetch session details: ${response.status}`);
+            const session = await checkSessionStatus(sessionId);
+            if (!session) {
               core.setOutput('has-active-session', 'false');
               return;
             }
             
-            const session = await response.json();
             const activeStatuses = ['working', 'blocked', 'resumed'];
             
             if (activeStatuses.includes(session.status_enum)) {