Add GitHub Action to auto-assign Devin PRs to requesting users

[devin-ai-integration]

Summary

Adds a GitHub Actions workflow that automatically assigns Devin-created PRs to the user who requested the Devin session. When Devin opens a PR, the workflow parses the "Requested by" field from the PR description and assigns the PR to that GitHub user.

Handles two formats Devin uses:

• Requested by: @username
• Requested by: Full Name (@username)

Review & Testing Checklist for Human

• Verify regex against actual PR bodies — spot-check a few recent Devin PRs to confirm the "Requested by" pattern matches. If Devin's description format varies (e.g. different whitespace, markdown formatting), the regex may silently fail to match.
• Confirm permissions are sufficient — the workflow needs issues: write to call addAssignees. Verify this works with the org's GitHub Actions permission settings (Settings > Actions > General > Workflow permissions).
• No error handling on the API call — if the extracted username is invalid or not a repo collaborator, the addAssignees call will throw. Consider whether a try/catch with a warning log is needed.

Test plan: After merging, trigger a new Devin session that creates a PR on this repo. Verify the workflow runs (check the Actions tab) and the PR gets assigned to the requesting user. Also verify it does not run on non-Devin PRs.

Notes

• The same workflow is being added to elementary-internal, elementary, and dbt-data-reliability in parallel PRs.
• Link to Devin run: https://app.devin.ai/sessions/b9c4ec80086244d9a0e2f2c440b2363e
• Requested by: @haritamar

Summary by CodeRabbit

• Chores
  • Implemented automated PR assignment for the Devin AI integration bot
  • Automatically routes pull requests to the appropriate user based on request information, improving workflow efficiency

[devin-ai-integration]

🤖 Devin AI Engineer

I'll be helping with this pull request! Here's what you should know:

✅ I will automatically:

• Address comments on this PR. Add '(aside)' to your comment to have me ignore it.
• Look at CI failures and help fix them

Note: I can only respond to comments from users who have write access to this repository.

⚙️ Control Options:

• Disable automatic comment and CI monitoring

[github-actions]

👋 @devin-ai-integration[bot]
Thank you for raising your pull request.
Please make sure to add tests and document all user-facing changes.
You can do this by editing the docs files in this pull request.

[coderabbitai]

📝 Walkthrough

Walkthrough

A GitHub Actions workflow is introduced to automatically assign pull requests opened by the Devin AI integration bot. The workflow extracts a requesting user from the PR body using regex pattern matching and assigns that user to the PR, with logging for both successful and failed assignment attempts.

Changes

Cohort / File(s)	Summary
GitHub Actions Workflow .github/workflows/assign-devin-prs.yml	New workflow that triggers on PRs opened by devin-ai-integration[bot], parses PR body with regex to extract a requesting user (@mention or parentheses format), and assigns that user to the PR via GitHub REST API with conditional logic and logging.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 A rabbit's rejoice, automation so fine,
Devin's PRs assigned in record time!
Regex hops through the body with glee,
Assigning the users, as quick as can be. ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately and specifically describes the main change: introducing a GitHub Action workflow to auto-assign Devin-bot-created PRs to requesting users.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch devin/1770891201-auto-assign-devin-prs

---

No actionable comments were generated in the recent review. 🎉

🧹 Recent nitpick comments

.github/workflows/assign-devin-prs.yml (2)

22-29: Guard addAssignees with error handling to avoid failing the workflow.

If the requester is invalid or not a collaborator, addAssignees will throw and fail the job, preventing any logging about the actual issue.

🔧 Suggested error handling

-            if (user) {
-              await github.rest.issues.addAssignees({
-                owner: context.repo.owner,
-                repo: context.repo.repo,
-                issue_number: context.issue.number,
-                assignees: [user]
-              });
-              console.log(`Assigned PR #${context.issue.number} to @${user}`);
-            } else {
-              console.log('Could not determine requesting user from PR description');
-            }
+            if (!user) {
+              console.log('Could not determine requesting user from PR description');
+              return;
+            }
+            try {
+              await github.rest.issues.addAssignees({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: context.issue.number,
+                assignees: [user]
+              });
+              console.log(`Assigned PR #${context.issue.number} to @${user}`);
+            } catch (err) {
+              console.warn(`Failed to assign PR #${context.issue.number} to @${user}: ${err?.message ?? err}`);
+            }

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20-21: Make the requester regex more tolerant of formatting/casing variations.

The current pattern is case-sensitive and can be brittle with extra whitespace. A looser, case-insensitive match will reduce false negatives.

🔍 Suggested regex tweak

-            const match = body.match(/Requested by[:\s]*(?:@(\w[\w-]*)|[\w][\w\s]*\(@(\w[\w-]*)\))/);
+            const match = body.match(/Requested by[:\s]*(?:@([\w-]+)|[^(\n]*\(@([\w-]+)\))/i);

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