diff --git a/.clj-kondo/config.edn b/.clj-kondo/config.edn
index 0f1dbbd..9529527 100644
--- a/.clj-kondo/config.edn
+++ b/.clj-kondo/config.edn
@@ -1 +1 @@
-{:config-dirs ["org.suskalo/coffi"]}
+{:config-paths ["org.suskalo/coffi"]}
diff --git a/.clj-kondo/org.suskalo/coffi/coffi/hooks.clj b/.clj-kondo/org.suskalo/coffi/coffi/hooks.clj
deleted file mode 120000
index ec39996..0000000
--- a/.clj-kondo/org.suskalo/coffi/coffi/hooks.clj
+++ /dev/null
@@ -1 +0,0 @@
-../../../../resources/clj-kondo.exports/org.suskalo/coffi/coffi/hooks.clj
\ No newline at end of file
diff --git a/.clj-kondo/org.suskalo/coffi/hooks/coffi.clj b/.clj-kondo/org.suskalo/coffi/hooks/coffi.clj
new file mode 120000
index 0000000..e2437de
--- /dev/null
+++ b/.clj-kondo/org.suskalo/coffi/hooks/coffi.clj
@@ -0,0 +1 @@
+../../../../resources/clj-kondo.exports/org.suskalo/coffi/hooks/coffi.clj
\ No newline at end of file
diff --git a/resources/clj-kondo.exports/org.suskalo/coffi/coffi/hooks.clj b/resources/clj-kondo.exports/org.suskalo/coffi/coffi/hooks.clj
deleted file mode 100644
index ffab6be..0000000
--- a/resources/clj-kondo.exports/org.suskalo/coffi/coffi/hooks.clj
+++ /dev/null
@@ -1,9 +0,0 @@
-(ns ^:no-doc coffi.hooks
-  (:require
-   [clj-kondo.hooks-api :as api]))
-
-(defn defcfn
-  [{:keys [node]}]
-  (let [[] (rest (:children node))]
-    ;; TODO(Joshua): Add an implementation of this macro's hook
-    ))
diff --git a/resources/clj-kondo.exports/org.suskalo/coffi/config.edn b/resources/clj-kondo.exports/org.suskalo/coffi/config.edn
index 3cd09b1..a1224fe 100644
--- a/resources/clj-kondo.exports/org.suskalo/coffi/config.edn
+++ b/resources/clj-kondo.exports/org.suskalo/coffi/config.edn
@@ -1 +1,2 @@
-{:hooks {:analyze-call {coffi.ffi/defcfn coffi.hooks/defcfn}}}
+{:hooks {:analyze-call {coffi.ffi/defcfn hooks.coffi/defcfn}}
+ :linters {:coffi.ffi/invalid-syntax {:level :error}}}
diff --git a/resources/clj-kondo.exports/org.suskalo/coffi/hooks/coffi.clj b/resources/clj-kondo.exports/org.suskalo/coffi/hooks/coffi.clj
new file mode 100644
index 0000000..e161722
--- /dev/null
+++ b/resources/clj-kondo.exports/org.suskalo/coffi/hooks/coffi.clj
@@ -0,0 +1,81 @@
+(ns ^:no-doc hooks.coffi
+  (:require
+   [clj-kondo.hooks-api :as api]))
+
+(defn validate-type
+  [node]
+  (when-not (or (qualified-keyword? (api/sexpr node))
+                (and (api/vector-node? node)
+                     (qualified-keyword? (api/sexpr (first (:children node))))))
+    (api/reg-finding!
+     {:row (:row (meta node))
+      :col (:col (meta node))
+      :message "A type must be a qualified keyword or a vector with one as the first element."
+      :type :coffi.ffi/invalid-syntax})))
+
+(defn defcfn
+  [{:keys [node]}]
+  (try
+    (let [[var-name-node & more] (rest (:children node))
+          [docstring-node & more] (if (and (api/string-node? (first more))
+                                           (not (api/vector-node? (second more))))
+                                    more
+                                    (cons nil more))
+          [attr-map-node & more] (if (api/map-node? (first more))
+                                   more
+                                   (cons nil more))
+          [symbol-node native-arglist-node return-type-node & more] more
+          _ (when-not (or (and (api/token-node? symbol-node)
+                               (simple-symbol? (api/sexpr symbol-node)))
+                          (api/string-node? symbol-node))
+              (api/reg-finding! {:row (:row (meta symbol-node))
+                                 :col (:col (meta symbol-node))
+                                 :message "Native symbol must be a string or symbol."
+                                 :type :coffi.ffi/invalid-syntax}))
+          _ (run! validate-type (cons return-type-node (:children native-arglist-node)))
+          wrapper-nodes (when (seq more)
+                          {:native-fn (first more)
+                           :fn-tail (rest more)})
+          _ (when (and (:native-fn wrapper-nodes)
+                       (empty? (:fn-tail wrapper-nodes)))
+              (api/reg-finding!
+               {:row (:row (meta node))
+                :col (:col (meta node))
+                :message "A defcfn with a native-fn must have a function body."
+                :type :coffi.ffi/invalid-syntax}))
+          arglist-vec (api/vector-node
+                       (mapv api/token-node
+                             (repeatedly (count (:children native-arglist-node))
+                                         #(gensym "arg"))))
+          fn-body (if wrapper-nodes
+                    (:fn-tail wrapper-nodes)
+                    (list
+                     arglist-vec
+                     arglist-vec))
+          defn-node (api/list-node
+                     (list*
+                      (api/token-node 'defn)
+                      var-name-node
+                      (concat
+                       (filter some? [docstring-node attr-map-node])
+                       fn-body)))
+          let-node (api/list-node
+                    (list
+                     (api/token-node 'let)
+                     (api/vector-node
+                      (cond->> nil
+                        wrapper-nodes (concat [(:native-fn wrapper-nodes)
+                                               (api/list-node
+                                                (list
+                                                 (api/token-node 'fn)
+                                                 arglist-vec
+                                                 arglist-vec))])
+                        :always vec))
+                     defn-node))]
+      {:node let-node})
+    (catch Exception _
+      (api/reg-finding!
+       {:row (:row (meta node))
+        :col (:col (meta node))
+        :message "Invalid syntax"
+        :type :coffi.ffi/invalid-syntax}))))