diff --git a/.Rbuildignore b/.Rbuildignore
index 3feaccf9..3b45a736 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -25,3 +25,5 @@ vignettes/loo2-non-factorized_cache/*
 ^_pkgdown\.yml$
 ^pkgdown$
 ^touchstone$
+^[.]?air[.]toml$
+^\.vscode$
diff --git a/.github/workflows/format-suggest.yaml b/.github/workflows/format-suggest.yaml
new file mode 100644
index 00000000..af502100
--- /dev/null
+++ b/.github/workflows/format-suggest.yaml
@@ -0,0 +1,46 @@
+# Workflow derived from https://github.com/posit-dev/setup-air/tree/main/examples
+
+on:
+  # Using `pull_request_target` over `pull_request` for elevated `GITHUB_TOKEN`
+  # privileges, otherwise we can't set `pull-requests: write` when the pull
+  # request comes from a fork, which is our main use case (external contributors).
+  #
+  # `pull_request_target` runs in the context of the target branch (`main`, usually),
+  # rather than in the context of the pull request like `pull_request` does. Due
+  # to this, we must explicitly checkout `ref: ${{ github.event.pull_request.head.sha }}`.
+  # This is typically frowned upon by GitHub, as it exposes you to potentially running
+  # untrusted code in a context where you have elevated privileges, but they explicitly
+  # call out the use case of reformatting and committing back / commenting on the PR
+  # as a situation that should be safe (because we aren't actually running the untrusted
+  # code, we are just treating it as passive data).
+  # https://securitylab.github.com/resources/github-actions-preventing-pwn-requests/
+  pull_request_target:
+
+name: format-suggest.yaml
+
+jobs:
+  format-suggest:
+    name: format-suggest
+    runs-on: ubuntu-latest
+
+    permissions:
+      # Required to push suggestion comments to the PR
+      pull-requests: write
+
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+
+      - name: Install
+        uses: posit-dev/setup-air@v1
+
+      - name: Format
+        run: air format .
+
+      - name: Suggest
+        uses: reviewdog/action-suggester@v1
+        with:
+          level: error
+          fail_level: error
+          tool_name: air
diff --git a/.gitignore b/.gitignore
index 9c69942e..6af12f93 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,9 +10,6 @@ loo.Rproj
 .Rproj.user/
 .Rproj.user
 
-# vscode/positron/etc settings
-.vscode/*
-
 # produced vignettes
 vignettes/loo2-lfo_cache/*
 vignettes/loo2-non-factorizable_cache/*
diff --git a/.vscode/extensions.json b/.vscode/extensions.json
new file mode 100644
index 00000000..15a1ec90
--- /dev/null
+++ b/.vscode/extensions.json
@@ -0,0 +1,6 @@
+{
+    "recommendations": [
+        "Posit.air-vscode",
+        "etiennebacher.jarl-vscode"
+    ]
+}
diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 00000000..a9f69fe4
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,10 @@
+{
+    "[r]": {
+        "editor.formatOnSave": true,
+        "editor.defaultFormatter": "Posit.air-vscode"
+    },
+    "[quarto]": {
+        "editor.formatOnSave": true,
+        "editor.defaultFormatter": "quarto.quarto"
+    }
+}
diff --git a/air.toml b/air.toml
new file mode 100644
index 00000000..e69de29b