diff --git a/.changeset/patch-add-copilot-agent-setup-workflow.md b/.changeset/patch-add-copilot-agent-setup-workflow.md
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+---
+"gh-aw": patch
+---
+
+Add GitHub Copilot agent setup workflow
+
+Adds a `.github/workflows/copilot-setup-steps.yml` workflow file to configure the GitHub Copilot coding agent environment with preinstalled tools and dependencies. The workflow mirrors the setup steps from the CI workflow's build job, including Node.js, Go, JavaScript dependencies, development tools, and build step. This provides Copilot agents with a fully configured development environment and speeds up agent workflows.
diff --git a/.github/workflows/copilot-setup-steps.yml b/.github/workflows/copilot-setup-steps.yml
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+++ b/.github/workflows/copilot-setup-steps.yml
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+name: "Copilot Setup Steps"
+
+# Automatically run the setup steps when they are changed to allow for easy validation, and
+# allow manual testing through the repository's "Actions" tab
+on:
+  workflow_dispatch:
+  push:
+    paths:
+      - .github/workflows/copilot-setup-steps.yml
+  pull_request:
+    paths:
+      - .github/workflows/copilot-setup-steps.yml
+
+jobs:
+  # The job MUST be called `copilot-setup-steps` or it will not be picked up by Copilot.
+  copilot-setup-steps:
+    runs-on: ubuntu-latest
+
+    # Set the permissions to the lowest permissions possible needed for your steps.
+    # Copilot will be given its own token for its operations.
+    permissions:
+      # If you want to clone the repository as part of your setup steps, for example to install dependencies, you'll need the `contents: read` permission. If you don't clone the repository in your setup steps, Copilot will do this for you automatically after the steps complete.
+      contents: read
+
+    # You can define any steps you want, and they will run before the agent starts.
+    # If you do not check out your code, Copilot will do this for you.
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v5
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v5
+        with:
+          node-version: "24"
+          cache: npm
+          cache-dependency-path: pkg/workflow/js/package-lock.json
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+          cache: true
+
+      - name: Install JavaScript dependencies
+        run: npm ci
+        working-directory: ./pkg/workflow/js
+
+      - name: Install development dependencies
+        run: make deps-dev
+
+      - name: Build code
+        run: make build
+        continue-on-error: true