diff --git a/.github/workflows/conformance.yml b/.github/workflows/conformance.yml
new file mode 100644
index 0000000..32e16ad
--- /dev/null
+++ b/.github/workflows/conformance.yml
@@ -0,0 +1,26 @@
+name: Conformance
+
+# Canonical YAML test-suite conformance: parse-level, value-level, and the canonical
+# event-stream gate. The corpus is fetched, not vendored, so this job fetches it and then
+# runs the opt-in conformance tests as a gate. The event gate's recorded-gap set fails the
+# build on any regression or any silently-closed gap. One concern, one badge.
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  conformance:
+    name: Conformance
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v6
+      - name: Fetch the canonical yaml-test-suite
+        run: bash scripts/fetch-yaml-test-suite.sh
+      - name: Run conformance gates
+        run: PUREYAML_RUN_YAML_TEST_SUITE=1 swift test --filter Conformance
diff --git a/README.md b/README.md
index 0a58169..c373a6c 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,7 @@
 [![Linux](https://github.com/mihaelamj/PureYAML/actions/workflows/linux.yml/badge.svg?branch=main)](https://github.com/mihaelamj/PureYAML/actions/workflows/linux.yml)
 [![Windows](https://github.com/mihaelamj/PureYAML/actions/workflows/windows.yml/badge.svg?branch=main)](https://github.com/mihaelamj/PureYAML/actions/workflows/windows.yml)
 [![WASM](https://github.com/mihaelamj/PureYAML/actions/workflows/wasm.yml/badge.svg?branch=main)](https://github.com/mihaelamj/PureYAML/actions/workflows/wasm.yml)
+[![Conformance](https://github.com/mihaelamj/PureYAML/actions/workflows/conformance.yml/badge.svg?branch=main)](https://github.com/mihaelamj/PureYAML/actions/workflows/conformance.yml)
 [![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](LICENSE)
 
 PureYAML is a dependency-free YAML package written entirely in Swift.