diff --git a/crates/opy-rs/src/compiler/tests/builtins.rs b/crates/opy-rs/src/compiler/tests/builtins.rs
index ce45d64a..02bf9070 100644
--- a/crates/opy-rs/src/compiler/tests/builtins.rs
+++ b/crates/opy-rs/src/compiler/tests/builtins.rs
@@ -305,6 +305,30 @@ rule "builtin surface":
     assert_eq!(artifact.emitted.matches("Create HUD Text").count(), 6);
 }
 
+#[test]
+fn start_hot_keyword_arguments_bind_like_positional_arguments() {
+    let source = include_str!("../../manifest/probes/start-hot-signature.opy");
+    let hir = crate::compile(source, "start-hot-signature.opy", Path::new("."))
+        .expect("pinned startHoT positional and keyword forms must resolve natively");
+    let artifact = Compiler::new()
+        .expect("released Workshop contract must load")
+        .compile_hir(&hir)
+        .expect("pinned startHoT positional and keyword forms must lower natively");
+
+    assert_eq!(artifact.wir.rules.len(), 2);
+    assert_eq!(artifact.wir.rules[0].actions.len(), 1);
+    assert_eq!(artifact.wir.rules[1].actions.len(), 1);
+    let mut positional = artifact.wir.clone();
+    positional.rules.truncate(1);
+    let mut keyword = artifact.wir;
+    keyword.rules.remove(0);
+    keyword.rules[0].name = positional.rules[0].name.clone();
+    assert!(
+        workshop_rs::roundtrip::equivalent(&positional, &keyword),
+        "keyword arguments must bind to the same Workshop arguments as positional calls"
+    );
+}
+
 #[test]
 fn stop_chasing_variable_dispatches_by_variable_kind() {
     let source = "globalvar g\nplayervar p\nrule \"r\":\n    @Event eachPlayer\n    stopChasingVariable(g)\n    stopChasingVariable(eventPlayer.p)\n";
diff --git a/crates/opy-rs/src/manifest/data/manifest.json b/crates/opy-rs/src/manifest/data/manifest.json
index ce577060..a1f08a43 100644
--- a/crates/opy-rs/src/manifest/data/manifest.json
+++ b/crates/opy-rs/src/manifest/data/manifest.json
@@ -983,7 +983,7 @@
     {
       "catalogId": "startHealingOverTime",
       "evidence": [
-        "builtin-surface"
+        "start-hot-signature"
       ],
       "id": "startHoT",
       "kind": "memberAction",
@@ -995,7 +995,7 @@
           "name": "duration"
         },
         {
-          "name": "healing"
+          "name": "healingPerSecond"
         }
       ],
       "receiver": "Player"
@@ -2993,26 +2993,6 @@
       "params": [],
       "receiver": "Player"
     },
-    {
-      "catalogId": "startHealingOverTime",
-      "evidence": [
-        "builtin-surface"
-      ],
-      "id": "startHoT",
-      "kind": "memberAction",
-      "params": [
-        {
-          "name": "healer"
-        },
-        {
-          "name": "rate"
-        },
-        {
-          "name": "duration"
-        }
-      ],
-      "receiver": "Player"
-    },
     {
       "catalogId": "isInSpawnRoom",
       "evidence": [
diff --git a/crates/opy-rs/src/manifest/probes/probes.json b/crates/opy-rs/src/manifest/probes/probes.json
index 358c3dbe..c6f150a8 100644
--- a/crates/opy-rs/src/manifest/probes/probes.json
+++ b/crates/opy-rs/src/manifest/probes/probes.json
@@ -358,6 +358,13 @@
       "sha256": "5b69c61321ca05c3a9fbc2c12d225dbce749b7a05d82ad1b2f11852f4d5ac208",
       "source": "missing-values.opy"
     },
+    {
+      "expect": "success",
+      "id": "start-hot-signature",
+      "outputSha256": "a9b80d7f57b61fdb490c15b63c635f7e5e6dd44658e9603ca630cc27b850a785",
+      "sha256": "399aa9fea314fec321d49b3cea47af7a5d8dfb84cd52b432325bf1130f38bdbe",
+      "source": "start-hot-signature.opy"
+    },
     {
       "expect": "success",
       "id": "missing-actions",
diff --git a/crates/opy-rs/src/manifest/probes/start-hot-signature.opy b/crates/opy-rs/src/manifest/probes/start-hot-signature.opy
new file mode 100644
index 00000000..42ae7a0b
--- /dev/null
+++ b/crates/opy-rs/src/manifest/probes/start-hot-signature.opy
@@ -0,0 +1,7 @@
+rule "startHoT positional signature":
+    @Event eachPlayer
+    eventPlayer.startHoT(null, 2, 3)
+
+rule "startHoT keyword signature":
+    @Event eachPlayer
+    eventPlayer.startHoT(healer=null, duration=2, healingPerSecond=3)