diff --git a/crates/workshop-rs/src/catalog/data/catalog.json b/crates/workshop-rs/src/catalog/data/catalog.json
index 608b93f7..2b5a7e8b 100644
--- a/crates/workshop-rs/src/catalog/data/catalog.json
+++ b/crates/workshop-rs/src/catalog/data/catalog.json
@@ -366,7 +366,7 @@
         "name"
       ],
       "paramTypes": [
-        "Player|Array",
+        "Player|Array|EntityId",
         "String"
       ],
       "params": [
@@ -1987,10 +1987,7 @@
       "paramCoercions": [
         null,
         null,
-        {
-          "falseAsNumber": true,
-          "trueAsNumber": true
-        },
+        null,
         {
           "nullVectorAsNull": true
         },
@@ -2008,7 +2005,7 @@
       "paramTypes": [
         "Hero|Array",
         "Team",
-        "Number",
+        "Number|Boolean",
         "Vector",
         "Vector"
       ],
@@ -5256,7 +5253,7 @@
       ]
     }
   ],
-  "digest": "d25c1099ed1f23b50612406ea7ff767ba785117a36794f1c45c4d01cd4e0ce29",
+  "digest": "29346860dce77a49f75ad9b4e5f230f91460f2b4c391e2c6fff26e082ac29bdd",
   "enums": [
     {
       "domain": "Impulse",
@@ -12361,7 +12358,7 @@
         "array"
       ],
       "paramTypes": [
-        "Array"
+        "Array|EntityId"
       ],
       "params": [
         "Array"
@@ -12393,7 +12390,7 @@
       "paramTypes": [
         "String|Array",
         "String|Array",
-        "String|Array"
+        "String|Array|EntityId"
       ],
       "params": [
         "String",
@@ -12423,7 +12420,7 @@
       "paramTypes": [
         "String",
         "Number",
-        "Number"
+        "Number|Boolean"
       ],
       "params": [
         "String",
@@ -12442,16 +12439,14 @@
         {
           "emptyArrayAsString": true
         },
-        {
-          "emptyArrayAsString": true
-        }
+        null
       ],
       "paramNames": [
         "string",
         "separator"
       ],
       "paramTypes": [
-        "String|Array",
+        "String|Array|EntityId",
         "String|Array"
       ],
       "params": [
diff --git a/crates/workshop-rs/tests/contextual_semantics.rs b/crates/workshop-rs/tests/contextual_semantics.rs
index f56a34be..d7cbe2d1 100644
--- a/crates/workshop-rs/tests/contextual_semantics.rs
+++ b/crates/workshop-rs/tests/contextual_semantics.rs
@@ -99,6 +99,19 @@ fn one_sided_contextual_aliases_reject_the_other_boolean() {
     assert!(format!("{error:?}").contains("semantic type"));
 }
 
+#[test]
+fn entity_ids_and_boolean_string_slice_counts_match_workshop_contract() {
+    let setup = program(
+        "Create Dummy Bot(All Heroes, Team 1, False, Null, Null); Start Forcing Dummy Bot Name(Last Created Entity, Custom String(\"x\"));",
+    );
+    validate_program(&setup);
+
+    let derived = program(
+        "Set Global Variable(probe, String Slice(String Replace(Custom String(\"x\"), String Split(Custom String(\"x\"), Empty Array), First Of(Last Created Entity)), 126, True)); Set Global Variable(parts, String Split(First Of(Last Created Entity), Empty Array));",
+    );
+    validate_program(&derived);
+}
+
 #[test]
 fn wait_until_keeps_numeric_exception_without_global_truthiness() {
     let numeric = program("Wait Until(1, 2);");
diff --git a/crates/workshop-rs/tests/identity.rs b/crates/workshop-rs/tests/identity.rs
index e4bf6aa2..feb33dea 100644
--- a/crates/workshop-rs/tests/identity.rs
+++ b/crates/workshop-rs/tests/identity.rs
@@ -12,7 +12,7 @@ use workshop_rs::catalog::{Catalog, Locale};
 /// (`workshop-catalog-gen build`) recomputes it and the pin is updated
 /// deliberately together with the data.
 const PINNED_CATALOG_DIGEST: &str =
-    "d25c1099ed1f23b50612406ea7ff767ba785117a36794f1c45c4d01cd4e0ce29";
+    "29346860dce77a49f75ad9b4e5f230f91460f2b4c391e2c6fff26e082ac29bdd";
 
 #[test]
 fn committed_catalog_digest_is_pinned() {
diff --git a/crates/workshop-rs/tests/language_conformance.rs b/crates/workshop-rs/tests/language_conformance.rs
index 303ac491..3c041e46 100644
--- a/crates/workshop-rs/tests/language_conformance.rs
+++ b/crates/workshop-rs/tests/language_conformance.rs
@@ -727,9 +727,13 @@ fn sample_argument(catalog: &Catalog, parameter_type: &str) -> String {
         "Boolean" => "True".to_string(),
         "Number" | "Number|Boolean" | "Boolean|Number" | "Boolean|Number|Vector" => "1".to_string(),
         "Vector" | "Vector|Player" | "Vector|Player|Array" => "Vector(0, 0, 0)".to_string(),
-        "String" | "String|Array" | "Object|String" => "Custom String(\"probe\")".to_string(),
-        "Array" => "All Players(All Teams)".to_string(),
-        "Player" | "Player|Array" | "Player|EntityId" => "Event Player".to_string(),
+        "String" | "String|Array" | "String|Array|EntityId" | "Object|String" => {
+            "Custom String(\"probe\")".to_string()
+        }
+        "Array" | "Array|EntityId" => "All Players(All Teams)".to_string(),
+        "Player" | "Player|Array" | "Player|Array|EntityId" | "Player|EntityId" => {
+            "Event Player".to_string()
+        }
         "Object" | "Object|Array" | "Boolean|Number|Object|Array" => "Event Player".to_string(),
         "Hero|Array" => "D.Va".to_string(),
         "Operation" => "Add".to_string(),
diff --git a/docs/language-support/actions.md b/docs/language-support/actions.md
index b9c1c81d..af666666 100644
--- a/docs/language-support/actions.md
+++ b/docs/language-support/actions.md
@@ -25,7 +25,7 @@ This document inventories the canonical Workshop actions supported by `workshop-
 | `Communicate` | ✅ Supported | Parameters: (Object: Player|Array, Comms: Comms). |
 | `Continue` | ✅ Supported | No parameters. |
 | `Create Beam Effect` | ✅ Supported | Parameters: (VisibleTo: Player|Array, Type: Beam, StartPosition: Vector, EndPosition: Vector, Color: Color, Reevaluation: EffectReeval). |
-| `Create Dummy Bot` | ✅ Supported | Parameters: (Hero: Hero|Array, Team: Team, Slot: Number, Position: Vector, Direction: Vector). |
+| `Create Dummy Bot` | ✅ Supported | Parameters: (Hero: Hero|Array, Team: Team, Slot: Number|Boolean, Position: Vector, Direction: Vector). |
 | `Create Effect` | ✅ Supported | Parameters: (VisibleTo: Player|Array, Type: Effect, Color: Color, Position: Vector|Player, Radius: Number, Reevaluation: EffectReeval). |
 | `Create HUD Text` | ✅ Supported | Parameters: (VisibleTo: Player|Array, Header: Object|String, Subheader: Object|String, Text: Object|String, Location: HudPosition, SortOrder: Number|Boolean, HeaderColor: Color, SubheaderColor: Color, TextColor: Color, Reevaluation: HudReeval, Spectators: SpecVisibility). |
 | `Create Homing Projectile` | ✅ Supported | Parameters: (Projectile: Projectile, Object: Player|Array, Position: Vector, Direction: Vector, Relativity: Relativity, ModifyHealth: ModifyHealth, Team: Team, Number: Number, Number: Number, Number: Number, DynamicEffect: DynamicEffect, DynamicEffect: DynamicEffect, Number: Number, Number: Number, Number: Number, Number: Number, Player: Player, Number: Number). |
@@ -176,7 +176,7 @@ This document inventories the canonical Workshop actions supported by `workshop-
 | `Start Damage Modification` | ✅ Supported | Parameters: (Object: Player|Array, Object: Player|Array, Number: Number, DamageReeval: DamageReeval). |
 | `Start Damage Over Time` | ✅ Supported | Parameters: (Object: Player|Array, Player: Player, Number: Number, Number: Number). |
 | `Start Facing` | ✅ Supported | Parameters: (Player: Player|Array, Direction: Vector, Turn Rate: Number, Relativity: Relativity, Reevaluation: FacingReeval). |
-| `Start Forcing Dummy Bot Name` | ✅ Supported | Parameters: (Object: Player|Array, String: String). |
+| `Start Forcing Dummy Bot Name` | ✅ Supported | Parameters: (Object: Player|Array|EntityId, String: String). |
 | `Start Forcing Player Outlines` | ✅ Supported | Parameters: (ViewedPlayers: Player|Array, ViewingPlayers: Player|Array, Visible: Boolean, Color: Color, Visibility: OutlineVisibility). |
 | `Start Forcing Player Position` | ✅ Supported | Parameters: (Player: Player, Position: Vector, Boolean: Boolean). |
 | `Start Forcing Player To Be Hero` | ✅ Supported | Parameters: (Object: Player|Array, Hero: Hero). |
diff --git a/docs/language-support/values.md b/docs/language-support/values.md
index e78e0e57..124cb714 100644
--- a/docs/language-support/values.md
+++ b/docs/language-support/values.md
@@ -80,7 +80,7 @@ This document inventories canonical Workshop values and expressions in `workshop
 | `Farthest Player From` | ✅ Supported | Returns: `Player`; Parameters: (Position: Vector, Team: Team). |
 | `False` | ✅ Supported | Returns: `BoolLiteral`. |
 | `Filtered Array` | ✅ Supported | Returns: `Array`; Parameters: (Array: Array, Condition: Boolean). |
-| `First Of` | ✅ Supported | Returns: `Object|Array`; Parameters: (Array: Array). |
+| `First Of` | ✅ Supported | Returns: `Object|Array`; Parameters: (Array: Array|EntityId). |
 | `Flag Position` | ✅ Supported | Returns: `Vector`; Parameters: (Team: Team). |
 | `Forward` | ✅ Supported | Returns: `Array`. |
 | `Game Mode` | ✅ Supported | Returns: `Gamemode`; Parameters: (Gamemode: Gamemode). |
@@ -232,9 +232,9 @@ This document inventories canonical Workshop values and expressions in `workshop
 | `String` | ✅ Supported | Returns: `String`; Parameters: (String: String, {0}: Object|Array, {1}: Object|Array, {2}: Object|Array). `Custom String` remains supported. |
 | `String Contains` | ✅ Supported | Returns: `Boolean`; Parameters: (String: String, String: String). |
 | `String Length` | ✅ Supported | Returns: `Number`; Parameters: (String: String). |
-| `String Replace` | ✅ Supported | Returns: `String`; Parameters: (String: String|Array, Search: String|Array, Replacement: String|Array). |
-| `String Slice` | ✅ Supported | Returns: `String`; Parameters: (String: String, Start Index: Number, Count: Number). |
-| `String Split` | ✅ Supported | Returns: `Array`; Parameters: (String: String|Array, Separator: String|Array). |
+| `String Replace` | ✅ Supported | Returns: `String`; Parameters: (String: String|Array, Search: String|Array, Replacement: String|Array|EntityId). |
+| `String Slice` | ✅ Supported | Returns: `String`; Parameters: (String: String, Start Index: Number, Count: Number|Boolean). |
+| `String Split` | ✅ Supported | Returns: `Array`; Parameters: (String: String|Array|EntityId, Separator: String|Array). |
 | `Subtract` | ✅ Supported | Returns: `Number|Vector`; Parameters: (a: Number|Boolean|Vector, b: Number|Boolean|Vector). |
 | `Tangent From Degrees` | ✅ Supported | Returns: `Number`; Parameters: (Number: Number). |
 | `Tangent From Radians` | ✅ Supported | Returns: `Number`; Parameters: (Number: Number). |