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adds changelog for new default env vars in workers builds #22988

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merged 4 commits into from
Jun 11, 2025
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adds changelog for new default env vars in workers builds #22988

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f8160d7
adds changelog for new default env vars in workers builds
korinne Jun 10, 2025
faf0f7f
mentions that this is a previous Pages feature
korinne Jun 10, 2025
bfac0a9
updates title
korinne Jun 10, 2025
3e8d189
Update src/content/changelog/workers/2025-06-10-default-env-vars.mdx
korinne Jun 10, 2025
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25 changes: 25 additions & 0 deletions src/content/changelog/workers/2025-06-10-default-env-vars.mdx
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---
title: Default system environment variables in Workers Builds
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@irvinebroque irvinebroque Jun 10, 2025

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not sure I would consider these "default system environment variables" if they are variables related to the git commit/branch?

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@korinne korinne Jun 10, 2025

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Updated the title! We do call them "system environment variables" in the docs, but agreed, not super accurate.

description: Workers Builds now injects default environment variables
products:
- workers
date: 2025-06-10T01:00:00Z
---

[Workers Builds](/workers/ci-cd/builds/) connects your Worker to a [Git repository](/workers/ci-cd/builds/git-integration/), and automates building and deploying your code on each pushed change.

To make CI/CD pipelines even more flexible, Workers Builds now automatically injects [default system environment variables](/workers/ci-cd/builds/configuration/#environment-variable) into your build process. You can use these variables to customize your build process based on the deployment context, such as the branch or commit.
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@windsurf-bot windsurf-bot bot Jun 10, 2025

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There's a broken link in line 11. The anchor should be '#environment-variables' (plural) instead of '#environment-variable' (singular) to match the correct anchor used in line 25.

Suggested change
To make CI/CD pipelines even more flexible, Workers Builds now automatically injects [default system environment variables](/workers/ci-cd/builds/configuration/#environment-variable) into your build process. You can use these variables to customize your build process based on the deployment context, such as the branch or commit.
To make CI/CD pipelines even more flexible, Workers Builds now automatically injects [default system environment variables](/workers/ci-cd/builds/configuration/#environment-variables) into your build process. You can use these variables to customize your build process based on the deployment context, such as the branch or commit.


The following system environment variables are injected by default:

| Environment Variable | Injected value | Example use-case |
| ----------------------- | ------------------------------- | --------------------------------------------------------------------------------------- |
| `CI` | `true` | Changing build behavior when run on CI versus locally |
| `WORKERS_CI` | `1` | Changing build behavior when run on Workers Builds versus locally |
| `WORKERS_CI_BUILD_UUID` | `<build-uuid-of-current-build>` | Passing the Build UUID along to custom workflows |
| `WORKERS_CI_COMMIT_SHA` | `<sha1-hash-of-current-commit>` | Passing current commit ID to error reporting, for example, Sentry |
| `WORKERS_CI_BRANCH` | `<branch-name-from-push-event` | Customizing build based on branch, for example, disabling debug logging on `production` |

You can override these default values and add your own custom environment variables by navigating to **your Worker** > **Settings** > **Environment variables**.

Learn more in the [Build configuration documentation](/workers/ci-cd/builds/configuration/#environment-variables).
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