diff --git a/crates/engine/src/cmd/addons/typetools.rs b/crates/engine/src/cmd/addons/typetools.rs
index 29ca6f6bf..320dce6b9 100644
--- a/crates/engine/src/cmd/addons/typetools.rs
+++ b/crates/engine/src/cmd/addons/typetools.rs
@@ -89,12 +89,6 @@ fn text_tweaker(s: &mut Session, p: &Value) -> Result<Value> {
     let mut rng = Rng::new(whole_or(p, "seed", 0, C)?);
     let skip = switch_or(p, "skipSpaces", true, C)?;
     let setup = s.doc()?.doc.setup.clone();
-    // A range given as anything but whole bytes is refused, not read as all of the text.
-    for k in ["start", "end"] {
-        if p.get(k).is_some_and(|v| !v.is_null() && v.as_u64().is_none()) {
-            return Err(bad(C, format!("`{k}` must be a whole number of bytes")));
-        }
-    }
     // At a caret, all of the object's text.
     let ranges = type_ranges(s, p, C, |text, _| Some((0, text.len())))?;
     // Each object's changed characters: (byte, its change), worked out before the edit.
diff --git a/crates/engine/src/cmd/addons/typetools/tests.rs b/crates/engine/src/cmd/addons/typetools/tests.rs
index fec04f9c6..6c56f6769 100644
--- a/crates/engine/src/cmd/addons/typetools/tests.rs
+++ b/crates/engine/src/cmd/addons/typetools/tests.rs
@@ -196,7 +196,7 @@ fn bad_params_are_refused_without_a_change() {
         json!({"ids": [999_999]}),
         json!({"id": id.0, "start": -1}),
         json!({"id": id.0, "start": 1, "end": 1.5}),
-        json!({"end": "2"}),
+        json!({"id": id.0, "end": "2"}),
     ] {
         assert!(s.execute(C, &p).is_err(), "{p}");
         assert_eq!(s.doc().unwrap().doc, before, "{p}");
diff --git a/docs/mcp.md b/docs/mcp.md
index e50412eb5..7c0499a06 100644
--- a/docs/mcp.md
+++ b/docs/mcp.md
@@ -1208,8 +1208,8 @@ and `amount` in `color.harmony`; `angle` in `paint.editGradient` and in the `gra
 swatch refuses a `tint` that is not a number with `` stop 0: `tint` must be a number ``.
 
 A byte offset must be a whole number of at least 0. `at` in `text.startList`, and `start` and `end` in
-`text.editRange`, `text.getRange`, `text.setRangeStyle` and the `type.step`, `type.size.*`, `type.resetTracking` and
-`type.resetHorizontalScale` commands given an `id`, refuse a negative or fractional number with
+`text.editRange`, `text.getRange`, `text.setRangeStyle` and the `type.step`, `type.size.*`, `type.resetTracking`,
+`type.resetHorizontalScale` and `addon.type.textTweaker` commands given an `id`, refuse a negative or fractional number with
 `` `at` must be a whole number ``, naming the key, and change nothing. `2.0` is read as `2`, and a null as the key left out.
 
 A step can use an earlier step's result, in `run` as in the `command_batch` tool. A parameter string that is exactly