diff --git a/.github/workflows/swift-tests.yml b/.github/workflows/swift-tests.yml
index 7e8c5b06..c1a8194e 100644
--- a/.github/workflows/swift-tests.yml
+++ b/.github/workflows/swift-tests.yml
@@ -145,3 +145,27 @@ jobs:
             ARCHS=arm64 \
             CODE_SIGNING_ALLOWED=NO \
             build
+
+  # Advisory only: SwiftLint reports style violations without ever failing the
+  # build. Runs in a pinned container (no Xcode plugin, no pbxproj changes) so
+  # it can never break the documented xcodebuild path or block a merge.
+  lint:
+    name: SwiftLint (advisory)
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    # This job runs a third-party container image, so give it the least
+    # privilege we can: a read-only token, and no credentials left in the
+    # checkout for the container to find.
+    permissions:
+      contents: read
+    container:
+      # Tag for readability, digest for immutability (tags can be repointed).
+      # Bump both together, deliberately — never a floating tag.
+      image: ghcr.io/realm/swiftlint:0.65.0@sha256:a482729f4b58741875af1566f23397f3f6db300372756fc31606d0a4527fab9e
+    continue-on-error: true
+    steps:
+      - uses: actions/checkout@v5
+        with:
+          persist-credentials: false
+      - name: Run SwiftLint
+        run: swiftlint lint --reporter github-actions-logging
diff --git a/.swiftlint.yml b/.swiftlint.yml
new file mode 100644
index 00000000..e35a75d0
--- /dev/null
+++ b/.swiftlint.yml
@@ -0,0 +1,33 @@
+# Build artifacts and generated sources; keeps local `swiftlint` runs clean
+# (CI checkouts are fresh, so this only matters in a working tree).
+excluded:
+  - .build
+  - .swiftpm
+  - .DerivedData
+  - DerivedData
+  - build
+  - localPackages/*/.build
+
+disabled_rules:
+  - line_length
+  - type_name
+  - identifier_name
+  - statement_position
+  - implicit_optional_initialization
+  - force_try
+  - vertical_whitespace
+  - for_where
+  - control_statement
+  - void_function_in_ternary
+  - redundant_discardable_let  # SwiftUI breaks without it
+  # To be enabled as we fix the issues
+  - trailing_whitespace
+  - cyclomatic_complexity
+  - function_body_length
+  - function_parameter_count
+  - type_body_length
+  - file_length
+  - large_tuple
+  - force_cast
+  - multiple_closures_with_trailing_closure
+  - nesting