Loom in PR descriptions — when it's worth it

You've just finished a feature, squashed a tricky bug, or refactored a critical component. Now comes the moment of truth: the pull request. You've crafted your code, pushed it up, and it's time to write that all-important description. For many of us, this is where the real work begins – translating complex changes into something digestible for your reviewers.

Sometimes, a well-written text description, coupled with a clear diff, is all you need. But then there are those PRs, the ones that make you wish you could just show your reviewer what you've done. This is where tools like Loom, or any screen recording software, can enter the picture. Embedding a video in your PR description can feel like a superpower, but like any superpower, it comes with caveats. So, when is it truly worth the effort, and when should you stick to good old text?

The PR Description Dilemma

A good pull request description is a cornerstone of effective code review. It's your chance to provide context, explain the "why" behind your changes, outline a test plan, and flag potential risks. A poorly written description can lead to endless back-and-forth comments, misunderstandings, and a slower review cycle.

While tools like Pullscribe excel at generating comprehensive textual PR descriptions, complete with summaries, test plans, and risk assessments, there are certain scenarios where text alone falls short. This is particularly true when dealing with visual changes, intricate user flows, or complex interactions that are difficult to articulate in words. This is where a quick screen recording can sometimes save hours of explanation.

Why Loom Can Be Powerful

Visual communication often triumphs over text, especially when you're trying to convey dynamic processes or user experiences. Here's why a well-placed Loom can be incredibly effective:

• Clarity and Conciseness: A 60-second video can sometimes explain more than a dozen paragraphs of text, especially for UI changes.
• Demonstrating Interaction: Showing how a user interacts with a new feature, or how different parts of a system respond to an action, is far more effective than static screenshots or written steps.
• Reducing Back-and-Forth: Reviewers can see exactly what you're talking about, reducing the need for clarifying questions like "What happens if I click X?" or "Can you show me the flow for Y?".
• Faster Review Cycles: When reviewers grasp the changes quickly, they can provide feedback and approve the PR faster.

However, the key is "well-placed." Not every PR benefits from a video, and overusing them can introduce its own set of problems.

When to Definitely Consider a Loom

Let's get concrete. Here are the scenarios where adding a Loom to your PR description is often a wise investment of your time:

1. UI/UX Changes and New Features

This is the most obvious use case. If your PR involves any front-end changes that alter the user interface, introduce new components, or modify existing user flows, a video is invaluable.

Example 1: A New User Settings Modal

Imagine you've implemented a new modal dialog for user settings that allows users to update their profile picture, change their email, and configure notification preferences. Describing every animation, validation error, and interaction flow in text would be tedious and likely incomplete.

• How a Loom helps: Record yourself opening the modal, navigating through the tabs, trying to save with invalid input (showing validation errors), successfully saving, and perhaps even showing the "before" and "after" if it's a redesign. You can narrate your actions, pointing out specific UI elements, accessibility considerations, or design choices.
• What to show:
  • How to access the new UI (e.g., clicking a specific button).
  • The complete interaction flow (e.g., opening, filling fields, submitting, closing).
  • Any new animations or transitions.
  • Validation states and error messages.
  • Responsiveness on different screen sizes (if applicable and brief).

2. Complex Backend Interactions with Visible Side Effects

Sometimes, your backend changes have subtle but crucial visible effects, or they involve a cascade of events across multiple services that are hard to grasp without seeing them in action.

Example 2: A New Data Synchronization Service

Let's say you've built a new service that pulls data from an external API, processes it, stores it in a database, and then pushes updates to a real-time dashboard via a WebSocket connection. The PR might involve changes across several microservices, a Kafka topic, and a frontend component.

• How a Loom helps: You can demonstrate the entire flow.
  • Start by showing a curl command or a Postman request triggering the initial data ingestion.
  • Then, switch to your terminal to show kubectl logs -f my-data-processor-service to confirm the processing.
  • Briefly show the data appearing in a database client (e.g., psql or mongo).
  • Finally, switch to the dashboard in your browser and show the real-time update as the data flows through.
  • Narration is key here: Explain each step, highlight the specific service logs, and connect the dots for your reviewer. This helps them understand the distributed nature of the change and verify that each component is working as expected.

3. Reproducing Hard-to-Describe Bugs or Edge Cases

Some bugs are notoriously difficult to reproduce or explain in text. They might involve specific timing, user input sequences, or race conditions.

• How a Loom helps: Record the exact steps you take to trigger the bug. This is invaluable for reviewers trying to understand and verify the fix.
• What to show:
  • The precise sequence of actions leading to the bug.
  • The erroneous behavior itself (e.g., a UI flicker, incorrect data, an unresponsive element).
  • If the PR fixes the bug, you can also include a "before" (showing the bug) and "after" (showing it fixed) in the same Loom.

When to Think Twice (and Why Not to Overdo It)

While powerful, Loom isn't a silver bullet. There are many situations where a video is overkill, and can even hinder the review process.

• Simple Code Changes:
  • Refactors: Pure code refactoring, dependency upgrades, minor bug fixes with no visible impact, or changes to backend business logic usually don't need a video. The code diff, unit tests, and a good textual explanation are sufficient.
  • Configuration Updates: Changing environment variables, build scripts, or infrastructure-as-code often requires no visual aid.
• Performance Overhead:
  • For you: Recording, editing, uploading, and embedding a video takes time. If the benefit doesn't outweigh this cost, don't do it.
  • For reviewers: Watching a video, especially a long or poorly edited one, can be slower than skimming text or inspecting the diff. Not everyone has the time or context to watch a video for every PR.
• Accessibility Concerns:
  • Not all reviewers can watch videos. They might be in a noisy environment, on a slow internet connection, or have visual impairments.
  • Always provide a text summary even when including a video. Never rely solely on the video to convey critical information.
• Maintenance Burden:
  • Videos can become outdated quickly. If the UI changes or the underlying logic evolves, the video in an old PR description might no longer be accurate, leading to confusion if someone references it later. Text is generally easier to update or clarify.
  • Videos are harder to search for specific information compared to text.

Best Practices for Effective Loom Usage

If you decide a Loom is warranted, follow these tips to make it truly effective:

1. Keep it Concise: Aim for 30 seconds to 2 minutes for most PRs. If it's longer, consider breaking it into multiple, focused videos or editing more aggressively. Reviewers appreciate brevity.
2. Narrate Clearly: Speak slowly and clearly. Explain what you're doing, why you're doing it, and what the expected outcome is. Point out specific elements or changes.
3. Focus on the Diff: Only show what's relevant to the PR. Don't take reviewers on a tour of your entire application unless it's directly pertinent to the changes.
4. Provide Context (Text is Still King): A Loom should augment your PR description, not replace it. Always include a clear summary, test plan, and risk callouts in text. Use the video to illustrate specific points mentioned in the text. For example, "See the new user flow in action [Loom link]" is much better than just a link.
5. **Link Prominently