diff --git a/run-tests/README.md b/run-tests/README.md
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+# Run Tests
+
+Language-agnostic composite action that executes a project's test suite with optional setup and failure-artifact upload. Designed for Forgejo Actions (works on GitHub Actions too).
+
+## Inputs
+
+| Input | Required | Default | Description |
+|---|---|---|---|
+| `command` | yes | — | Test command to execute (multiline allowed) |
+| `setup` | no | `""` | Setup commands run before tests (install deps, build, etc.) |
+| `working-directory` | no | `.` | Directory to run setup and command in |
+| `shell` | no | `bash` | Shell for setup and command |
+| `artifacts-path` | no | `""` | Glob of paths to upload on failure. Empty disables upload. |
+| `artifacts-name` | no | `test-artifacts` | Name of the uploaded artifact bundle |
+
+## Behavior
+
+1. Runs `setup` if provided. Non-zero exit fails the job immediately.
+2. Runs `command`. Exit code is captured but not yet propagated.
+3. If `command` failed and `artifacts-path` is set, uploads matching files.
+4. Re-exits with failure if `command` failed.
+
+This ordering ensures artifacts are always uploaded on failure, even though the job ultimately fails.
+
+## Usage
+
+### Node.js
+
+```yaml
+name: PR Tests
+on: [pull_request]
+jobs:
+  test:
+    runs-on: docker
+    steps:
+      - uses: https://code.forgejo.org/actions/checkout@v4
+      - uses: https://bitfreedom.net/code/apunkt/actions/run-tests@v1
+        with:
+          setup: npm ci
+          command: npm test
+          artifacts-path: |
+            coverage/**
+            junit.xml
+```
+
+### Python (pytest)
+
+```yaml
+- uses: https://bitfreedom.net/code/apunkt/actions/run-tests@v1
+  with:
+    setup: |
+      python -m pip install --upgrade pip
+      pip install -e .[test]
+    command: pytest --junitxml=report.xml
+    artifacts-path: report.xml
+```
+
+### Rust
+
+```yaml
+- uses: https://bitfreedom.net/code/apunkt/actions/run-tests@v1
+  with:
+    command: cargo test --all
+```
+
+### Multi-line command
+
+```yaml
+- uses: https://bitfreedom.net/code/apunkt/actions/run-tests@v1
+  with:
+    command: |
+      make lint
+      make test
+      make integration-test
+```
+
+## Making it a merge gate
+
+This action alone does not block merges. To enforce passing tests before merge on Forgejo:
+
+1. Repo → **Settings → Branches → Protected Branches**
+2. Add a rule for `main` (or your default branch)
+3. Enable **Require status checks to pass before merging**
+4. Add the workflow job name (e.g. `test`) to the required checks list
+
+After the workflow has run at least once on a PR, the check name will appear in the dropdown.
+
+## Notes
+
+- Forgejo runners often use the `docker` label rather than `ubuntu-latest`. Adjust `runs-on` per your runner setup.
+- Action references must use full URLs on Forgejo (`https://code.forgejo.org/actions/checkout@v4`), unlike GitHub where `actions/checkout@v4` is shorthand.
+- The failure-artifact upload uses [`forgejo/upload-artifact`](https://code.forgejo.org/forgejo/upload-artifact), which is API-compatible with `actions/upload-artifact` and works on both Forgejo and GitHub.
diff --git a/run-tests/action.yml b/run-tests/action.yml
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+name: Run Tests
+description: Runs a project's test suite with optional setup and failure-artifact upload. Language-agnostic.
+
+inputs:
+  command:
+    description: Test command to execute (multiline allowed)
+    required: true
+  setup:
+    description: Setup commands to run before tests (install deps, build, etc.)
+    required: false
+    default: ""
+  working-directory:
+    description: Directory to run setup and command in
+    required: false
+    default: "."
+  shell:
+    description: Shell to use for setup and command
+    required: false
+    default: bash
+  artifacts-path:
+    description: Glob of paths to upload on failure (test reports, logs). Empty disables upload.
+    required: false
+    default: ""
+  artifacts-name:
+    description: Name of the uploaded artifact bundle
+    required: false
+    default: test-artifacts
+
+runs:
+  using: composite
+  steps:
+    - name: Setup
+      if: inputs.setup != ''
+      shell: ${{ inputs.shell }}
+      working-directory: ${{ inputs.working-directory }}
+      run: ${{ inputs.setup }}
+
+    - name: Run tests
+      id: tests
+      shell: ${{ inputs.shell }}
+      working-directory: ${{ inputs.working-directory }}
+      run: ${{ inputs.command }}
+      continue-on-error: true
+
+    - name: Upload failure artifacts
+      if: inputs.artifacts-path != '' && steps.tests.outcome == 'failure'
+      uses: https://code.forgejo.org/forgejo/upload-artifact@v4
+      with:
+        name: ${{ inputs.artifacts-name }}
+        path: ${{ inputs.artifacts-path }}
+        if-no-files-found: ignore
+
+    - name: Propagate failure
+      if: steps.tests.outcome == 'failure'
+      shell: bash
+      run: exit 1