diff --git a/ROADMAP.md b/ROADMAP.md
index 1490139e..2fbf8256 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -127,7 +127,7 @@ Ranked; detail in [docs/roadmap.md](docs/roadmap.md) and [docs/gaps.md](docs/gap
 
 | Date | What landed |
 |---|---|
-| 2026-10-11 | Effect › Brush Strokes: Accented Edges, Angled Strokes, Crosshatch, Dark Strokes, Ink Outlines, Spatter, Sprayed Strokes, Sumi-e (G2). Command parameters from agents and files checked before anything changes (paint, place, cuts, dashes, crop, asset ids, anchors, paths, distort; #984–#999); command dialogs keep whole numbers whole, so Create Object Mosaic takes the tiles typed (#1000); stepper arrows take Shift (×10) and Ctrl/Cmd (÷10) like the arrow keys (#991). Exports and Rasterize supersample Art Optimized edges, so shapes meeting edge to edge leave no seam (#983). Character and paragraph styles take leading, kerning, mojikumi and the other attributes left out at their defaults (#1001). Drawing, typing and pasting with no layer shown and unlocked is refused instead of adding art to a hidden or locked layer (#1002). MCP `add_text` gives type on or in a path the colour asked for (#1003). MCP `screenshot` of a connected app renders the artboard asked for (#1004). `vectorcraft-cli run` ends quietly when its reader closes early (#1005). Select › All on Active Artboard selects on the artboard made active, not always the first (#1006). Reverse Gradient keeps off-centre midpoints, mirrored (#1007). A polar grid with no radial dividers draws none (#1008). Use Precise Cursors also covers the Pen's join pointer (#1009). SVGs with one absolute and one unitless root side import at their size, unstretched (#1010). DXF US survey inches, yards and miles open at their size and name (#1011). A file placed into a document with no other links follows its first change even while the app sits idle (#1031). PDF import keeps the style a font name says when the file doesn't embed the font (#1023). Shift selects ruler guides and art together, and Delete removes both (#1022). Open filled paths are hit by their fill on every side, the rotate cursor bows around the corner it is at, the flip icons match their flips, the Color Picker previews on the selection, and Properties › Transform reaches Scale Corners and Scale Strokes & Effects (#1036). Offset Path and the other booleans finish on outlines where the sweep used to loop until memory ran out (linesweeper 0.5, #1028). Floating panel groups stack into sets that move together, collapse to their tabs and dock as extra dock columns that scroll (#1020). Ruler guides live on layers: listed in the Layers panel, shown, hidden, locked, duplicated, merged and deleted with their layer, and moved between layers (#1021). A `.ai` whose editing data uses global process colours (`Xk`/`XK`) or pattern fills keeps its sublayers: the colours come in as global swatches at their tint, the patterns as pattern swatches (#1025). A `.ai` in PostScript form opens through its layers, read from the program itself, also when it names the prolog defining its operators without including it, as Rhino and other CAD apps write it (#1027). A fill or stroke chosen while the Type tool has characters selected colours just those characters (#1063). Scaled type shows its scaled font size, leading, baseline shift and horizontal scale in the Character panel, and a size typed there is the size you get (#1034). Character panel menu › Proportional Metrics sets Japanese and Chinese full-width glyphs on the font's proportional widths in horizontal type (#966). Align, Distribute, Move, Arrange, Lock, Hide, Ungroup and other Object commands that would change nothing no longer record an undo step or mark the document changed (#1060). Spot colours defined in Lab open with their Lab values from `.ai` and PDF files, instead of as wrong RGB colours or their CMYK equivalents (#1032). Build scripts leave a generated source they wouldn't change untouched, so the next build doesn't compile most of the workspace again where file times lose their sub-second part (#1051). A fill colour recolours the gradient mesh point last clicked with the Mesh tool or Direct Selection, and a Mesh tool click on a mesh's point selects that mesh (#1052). The All Tools drawer stays two tools wide instead of filling a wide window (#1054). Text Wrap's Make, Release and Options refuse a list of object ids with a malformed or unknown id instead of skipping it (#1055). A freeform gradient line with a malformed point index is refused instead of being shortened to the indices that are valid (#1056). The Corners dialog (`ui.corners`) refuses a malformed object id or a listed anchor that isn't a corner instead of editing the selection or the other corners (#1057). New View refuses a centre that isn't exactly [x, y] and a rotation that isn't a number, instead of trimming the one and saving the other as 0° (#1058). The command sweeps try junk scale, spacing and artboard values too, which they had skipped since before those bugs were fixed (#1059). EPS and PostScript `arc` and `arcn` with huge angles no longer hang the import, and an arc whose angles are whole turns apart is empty, as the PostScript reference defines it (#1062). Align and Distribute Spacing keep the key object still also when it is inside a selected group or compound path (#1074). A `.ai` whose layers can't be read yet still opens with its artboards where they were (in a grid, say), not in a row (#1068). Layer Options (`ui.layerOptions`) refuses a malformed or unknown row id instead of skipping it or opening on the highlighted rows (#1077). Shaper scribbles given a list of object ids refuse a malformed or unknown id instead of skipping it and editing the shapes that remain (#1078). Delete Width Point (`stroke.widthPoint.remove`) refuses a list of indices with a malformed entry instead of deleting the points that remain, and no longer wraps a huge index round on the web (#1079). Preferences' checkboxes have an outline when the pointer isn't over them, in every interface brightness, as the app's other dialogs' checkboxes do (#1080). The last plain checkboxes (Properties panel snapping and Scale Strokes & Effects, Revolve, Save options, Export for Screens, Variables, plug-in forms) keep a visible box at rest in every theme too (#885). Setting or copying a width point with a malformed index is refused instead of adding a new point or wrapping a huge index round (follow-up to #1079). An Illustrator EPS opened through its layers keeps its own page size and the red outline of text stacked over a dark one, as 0.8.0 did (#1102). The macOS DMG is built so the app in it passes `codesign --verify --strict --deep`, and the release checks that it does (#1085). Swatch and graphic style libraries, Libraries panel files, presets and plug-ins dropped on the window open as File › Open opens them instead of being placed on the canvas (#1083). A key object needs another selected object outside it: a change that leaves one object selected lets the key go, and one selected object aligns to the artboard whatever Align To says (#1088). Align to Artboard aligns to the active artboard, and actions play their Align to Artboard, All on Active Artboard and Paste in Place, in Front and in Back steps on the artboard active when they play (#1105). Align refuses a call with neither direction, and Align, Distribute, Reflect and Shear refuse a direction, axis, target or bounds they don't take instead of falling back to a default (#1106). `object.setProps` deselects the objects it hides or locks, the key object included, as the Layers panel's eye and lock do (#1107). Align, Distribute and Distribute Spacing move pattern tiles with the art when General › Transform Pattern Tiles is on (#1108). Object › Lock › All Artwork Above and Object › Hide › All Artwork Above deselect the selected objects they lock or hide, the key object included (#1109). Save Swatch Library's `count` is the number of swatches the file holds: `.gpl` and `.ase` hold solid colors only, and CSS leaves freeform gradients out (#1110). In a rotated view (Rotate View), an artboard's name stays at its own top-left corner (#1095). Ctrl+Shift+L, C, R, J and F align or justify the paragraphs of the selected type, or those the Type tool's selection touches (#1111). On macOS, file dialogs are sheets on the document window, so resizing one no longer crashes the app; while one is open the menus, Quit and Close wait, and its answer goes to the document that asked (#867). Shape Builder merges regions that crossing lines cut along the lines' own edges, so a strip merged across a grid of lines is one outline with no seams left inside (#1081). Proportional Metrics also works in vertical type: upright glyphs take the font's proportional heights (`vpal`), and Line-end Punctuation Half Width takes nothing more off the punctuation it re-spaced (#1082). Plug-in whole-number parameters keep their exact value however large, and stay in the range the manifest gives (#1091). PDF and `.ai` import keeps type spaced glyph by glyph (character tightening, optical kerning) with each glyph in its place, giving each character its own tracking when the file's font is installed, and CJK punctuation closed up by its proportional width continues its line (#1101). Direct Selection: pressing an anchor of a path selected whole keeps all its anchors selected, so the drag moves them all; Alt-dragging by an anchor copies the whole path, held by that anchor, which snaps onto other anchors and onto the original the copy leaves behind; Alt pressed or released during the drag turns the copy on and off, as with the Selection tool, whose copies snap to their original too, and the undo step is named Copy or Move for what the drag did (#1104). The toolbar's Fill/Stroke proxy and Color, Gradient and None buttons grow in two columns, where the three drawing modes sit side by side (#1129). An image copied in a browser that puts its `<img>` markup on the clipboard as text pastes as the picture, not the markup (#1089). `file.place` of an SVG with `crop: "crop"` frames and clips it by its viewBox, so art drawn on a shared canvas keeps its place and scale (#788). While a star is dragged, Ctrl/Cmd keeps its inner radius as the outer one grows and Alt keeps its shoulders straight (#812). Edit Toolbar opens the All Tools drawer beside the toolbar, dims the tools already in it, and adds, removes and moves tools by drag and drop while it is open (#1018). The Selection tool's arrow is black and Direct Selection's white in every theme, as users know them: in the dark themes they looked swapped. The font menu keeps its highlight on the same font when the list changes under it (a family's styles listed above it, fonts that finish loading, a favourite unstarred), and ends the live preview when that font leaves the list (#1116). The Windows installer has a Shortcuts page with a ticked "Create a desktop shortcut" box, and a silent install adds the shortcut unless `INSTALLDESKTOPSHORTCUT=""` is passed (#1128). Image Trace's Noise merges specks until none under its size is left beside another colour, so a higher Noise never gives more paths (#1130). `cargo clippy -D warnings` passes for the wasm32 web build (#1132). Gradient stops with opacity blend colour and opacity apart on the canvas, as Illustrator and the PDF and SVG exports do: a transparent stop's colour still tints the fade (#1142). An SVG mask whose art is all hidden imports as an empty opacity mask, so its object stays hidden as browsers draw it (#1143). Shift-click with the Artboard tool, or in the Artboards panel, selects several artboards, which then move, duplicate (Alt-drag) and delete together (#1139). A shape far beyond any page (from a malformed file) is left undrawn instead of making the renderer abort the app. Live Corners round corners where curved segments meet too, trimming each curve to what the cut leaves of it (#1144). Effect › Distort & Transform › Zig Zag's dialog has sliders for Size and Ridges per segment, and Relative / Absolute and Smooth / Corner as radio buttons (#1133). Object › Path › Offset Path opens on the offset, joins and miter limit it was last applied with (#1152). A marquee selects only the objects whose paths it touches: one drawn over a background, in Preview or Outline, no longer selects the background too (#1103). On Linux, Preferences › Performance › Linux Display Server › X11 (XWayland) opens the window through XWayland on a Wayland session, where files dropped from a file manager arrive (#1151). A selected gradient mesh shows its mesh lines and points with the Selection and Direct Selection tools too, not only with the Mesh tool (#1111). |
+| 2026-10-11 | Effect › Brush Strokes: Accented Edges, Angled Strokes, Crosshatch, Dark Strokes, Ink Outlines, Spatter, Sprayed Strokes, Sumi-e (G2). Command parameters from agents and files checked before anything changes (paint, place, cuts, dashes, crop, asset ids, anchors, paths, distort; #984–#999); command dialogs keep whole numbers whole, so Create Object Mosaic takes the tiles typed (#1000); stepper arrows take Shift (×10) and Ctrl/Cmd (÷10) like the arrow keys (#991). Exports and Rasterize supersample Art Optimized edges, so shapes meeting edge to edge leave no seam (#983). Character and paragraph styles take leading, kerning, mojikumi and the other attributes left out at their defaults (#1001). Drawing, typing and pasting with no layer shown and unlocked is refused instead of adding art to a hidden or locked layer (#1002). MCP `add_text` gives type on or in a path the colour asked for (#1003). MCP `screenshot` of a connected app renders the artboard asked for (#1004). `vectorcraft-cli run` ends quietly when its reader closes early (#1005). Select › All on Active Artboard selects on the artboard made active, not always the first (#1006). Reverse Gradient keeps off-centre midpoints, mirrored (#1007). A polar grid with no radial dividers draws none (#1008). Use Precise Cursors also covers the Pen's join pointer (#1009). SVGs with one absolute and one unitless root side import at their size, unstretched (#1010). DXF US survey inches, yards and miles open at their size and name (#1011). A file placed into a document with no other links follows its first change even while the app sits idle (#1031). PDF import keeps the style a font name says when the file doesn't embed the font (#1023). Shift selects ruler guides and art together, and Delete removes both (#1022). Open filled paths are hit by their fill on every side, the rotate cursor bows around the corner it is at, the flip icons match their flips, the Color Picker previews on the selection, and Properties › Transform reaches Scale Corners and Scale Strokes & Effects (#1036). Offset Path and the other booleans finish on outlines where the sweep used to loop until memory ran out (linesweeper 0.5, #1028). Floating panel groups stack into sets that move together, collapse to their tabs and dock as extra dock columns that scroll (#1020). Ruler guides live on layers: listed in the Layers panel, shown, hidden, locked, duplicated, merged and deleted with their layer, and moved between layers (#1021). A `.ai` whose editing data uses global process colours (`Xk`/`XK`) or pattern fills keeps its sublayers: the colours come in as global swatches at their tint, the patterns as pattern swatches (#1025). A `.ai` in PostScript form opens through its layers, read from the program itself, also when it names the prolog defining its operators without including it, as Rhino and other CAD apps write it (#1027). A fill or stroke chosen while the Type tool has characters selected colours just those characters (#1063). Scaled type shows its scaled font size, leading, baseline shift and horizontal scale in the Character panel, and a size typed there is the size you get (#1034). Character panel menu › Proportional Metrics sets Japanese and Chinese full-width glyphs on the font's proportional widths in horizontal type (#966). Align, Distribute, Move, Arrange, Lock, Hide, Ungroup and other Object commands that would change nothing no longer record an undo step or mark the document changed (#1060). Spot colours defined in Lab open with their Lab values from `.ai` and PDF files, instead of as wrong RGB colours or their CMYK equivalents (#1032). Build scripts leave a generated source they wouldn't change untouched, so the next build doesn't compile most of the workspace again where file times lose their sub-second part (#1051). A fill colour recolours the gradient mesh point last clicked with the Mesh tool or Direct Selection, and a Mesh tool click on a mesh's point selects that mesh (#1052). The All Tools drawer stays two tools wide instead of filling a wide window (#1054). Text Wrap's Make, Release and Options refuse a list of object ids with a malformed or unknown id instead of skipping it (#1055). A freeform gradient line with a malformed point index is refused instead of being shortened to the indices that are valid (#1056). The Corners dialog (`ui.corners`) refuses a malformed object id or a listed anchor that isn't a corner instead of editing the selection or the other corners (#1057). New View refuses a centre that isn't exactly [x, y] and a rotation that isn't a number, instead of trimming the one and saving the other as 0° (#1058). The command sweeps try junk scale, spacing and artboard values too, which they had skipped since before those bugs were fixed (#1059). EPS and PostScript `arc` and `arcn` with huge angles no longer hang the import, and an arc whose angles are whole turns apart is empty, as the PostScript reference defines it (#1062). Align and Distribute Spacing keep the key object still also when it is inside a selected group or compound path (#1074). A `.ai` whose layers can't be read yet still opens with its artboards where they were (in a grid, say), not in a row (#1068). Layer Options (`ui.layerOptions`) refuses a malformed or unknown row id instead of skipping it or opening on the highlighted rows (#1077). Shaper scribbles given a list of object ids refuse a malformed or unknown id instead of skipping it and editing the shapes that remain (#1078). Delete Width Point (`stroke.widthPoint.remove`) refuses a list of indices with a malformed entry instead of deleting the points that remain, and no longer wraps a huge index round on the web (#1079). Preferences' checkboxes have an outline when the pointer isn't over them, in every interface brightness, as the app's other dialogs' checkboxes do (#1080). The last plain checkboxes (Properties panel snapping and Scale Strokes & Effects, Revolve, Save options, Export for Screens, Variables, plug-in forms) keep a visible box at rest in every theme too (#885). Setting or copying a width point with a malformed index is refused instead of adding a new point or wrapping a huge index round (follow-up to #1079). An Illustrator EPS opened through its layers keeps its own page size and the red outline of text stacked over a dark one, as 0.8.0 did (#1102). The macOS DMG is built so the app in it passes `codesign --verify --strict --deep`, and the release checks that it does (#1085). Swatch and graphic style libraries, Libraries panel files, presets and plug-ins dropped on the window open as File › Open opens them instead of being placed on the canvas (#1083). A key object needs another selected object outside it: a change that leaves one object selected lets the key go, and one selected object aligns to the artboard whatever Align To says (#1088). Align to Artboard aligns to the active artboard, and actions play their Align to Artboard, All on Active Artboard and Paste in Place, in Front and in Back steps on the artboard active when they play (#1105). Align refuses a call with neither direction, and Align, Distribute, Reflect and Shear refuse a direction, axis, target or bounds they don't take instead of falling back to a default (#1106). `object.setProps` deselects the objects it hides or locks, the key object included, as the Layers panel's eye and lock do (#1107). Align, Distribute and Distribute Spacing move pattern tiles with the art when General › Transform Pattern Tiles is on (#1108). Object › Lock › All Artwork Above and Object › Hide › All Artwork Above deselect the selected objects they lock or hide, the key object included (#1109). Save Swatch Library's `count` is the number of swatches the file holds: `.gpl` and `.ase` hold solid colors only, and CSS leaves freeform gradients out (#1110). In a rotated view (Rotate View), an artboard's name stays at its own top-left corner (#1095). Ctrl+Shift+L, C, R, J and F align or justify the paragraphs of the selected type, or those the Type tool's selection touches (#1111). On macOS, file dialogs are sheets on the document window, so resizing one no longer crashes the app; while one is open the menus, Quit and Close wait, and its answer goes to the document that asked (#867). Shape Builder merges regions that crossing lines cut along the lines' own edges, so a strip merged across a grid of lines is one outline with no seams left inside (#1081). Proportional Metrics also works in vertical type: upright glyphs take the font's proportional heights (`vpal`), and Line-end Punctuation Half Width takes nothing more off the punctuation it re-spaced (#1082). Plug-in whole-number parameters keep their exact value however large, and stay in the range the manifest gives (#1091). PDF and `.ai` import keeps type spaced glyph by glyph (character tightening, optical kerning) with each glyph in its place, giving each character its own tracking when the file's font is installed, and CJK punctuation closed up by its proportional width continues its line (#1101). Direct Selection: pressing an anchor of a path selected whole keeps all its anchors selected, so the drag moves them all; Alt-dragging by an anchor copies the whole path, held by that anchor, which snaps onto other anchors and onto the original the copy leaves behind; Alt pressed or released during the drag turns the copy on and off, as with the Selection tool, whose copies snap to their original too, and the undo step is named Copy or Move for what the drag did (#1104). The toolbar's Fill/Stroke proxy and Color, Gradient and None buttons grow in two columns, where the three drawing modes sit side by side (#1129). An image copied in a browser that puts its `<img>` markup on the clipboard as text pastes as the picture, not the markup (#1089). `file.place` of an SVG with `crop: "crop"` frames and clips it by its viewBox, so art drawn on a shared canvas keeps its place and scale (#788). While a star is dragged, Ctrl/Cmd keeps its inner radius as the outer one grows and Alt keeps its shoulders straight (#812). Edit Toolbar opens the All Tools drawer beside the toolbar, dims the tools already in it, and adds, removes and moves tools by drag and drop while it is open (#1018). The Selection tool's arrow is black and Direct Selection's white in every theme, as users know them: in the dark themes they looked swapped. The font menu keeps its highlight on the same font when the list changes under it (a family's styles listed above it, fonts that finish loading, a favourite unstarred), and ends the live preview when that font leaves the list (#1116). The Windows installer has a Shortcuts page with a ticked "Create a desktop shortcut" box, and a silent install adds the shortcut unless `INSTALLDESKTOPSHORTCUT=""` is passed (#1128). Image Trace's Noise merges specks until none under its size is left beside another colour, so a higher Noise never gives more paths (#1130). `cargo clippy -D warnings` passes for the wasm32 web build (#1132). Gradient stops with opacity blend colour and opacity apart on the canvas, as Illustrator and the PDF and SVG exports do: a transparent stop's colour still tints the fade (#1142). An SVG mask whose art is all hidden imports as an empty opacity mask, so its object stays hidden as browsers draw it (#1143). Shift-click with the Artboard tool, or in the Artboards panel, selects several artboards, which then move, duplicate (Alt-drag) and delete together (#1139). A shape far beyond any page (from a malformed file) is left undrawn instead of making the renderer abort the app. Live Corners round corners where curved segments meet too, trimming each curve to what the cut leaves of it (#1144). Effect › Distort & Transform › Zig Zag's dialog has sliders for Size and Ridges per segment, and Relative / Absolute and Smooth / Corner as radio buttons (#1133). Object › Path › Offset Path opens on the offset, joins and miter limit it was last applied with (#1152). A marquee selects only the objects whose paths it touches: one drawn over a background, in Preview or Outline, no longer selects the background too (#1103). On Linux, Preferences › Performance › Linux Display Server › X11 (XWayland) opens the window through XWayland on a Wayland session, where files dropped from a file manager arrive (#1151). A selected gradient mesh shows its mesh lines and points with the Selection and Direct Selection tools too, not only with the Mesh tool (#1111). A blend's spine bends: the Anchor Point tool drags any of its segments into a curve, straight ones too, and Direct Selection reshapes its curved segments (`object.blend.spine.reshapeSegment`, #1111). |
 | 2026-10-10 | Initial live Revolve (Effect › 3D and Materials, #846, #605), in its own `three-d` crate. Progress docs re-measured and restructured to the craftrules standard (this page, `docs/target-app-parity.md`, `gaps.md`, `ui-parity.md`, the format, hardware, localization, effects and type checklists). Same day: v0.8.0; Effect › Distort, Pixelate and Texture filters (13); German interface; Variables (data merge); Graph Type value axes and tick marks; restart when the first frame never reaches the screen (#964) |
 | 2026-10-09 | Radial Blur, Smart Blur, Unsharp Mask (gap 2 begins); 340 commits, the busiest day |
 | 2026-10-08 | v0.5.0–v0.7.0; community contributions: Pen and shape-tool modifiers, Layers, Artboards, Japanese composition, Hebrew/Arabic type, interface languages, saved selections |
diff --git a/crates/engine/src/cmd/draw2.rs b/crates/engine/src/cmd/draw2.rs
index 16188609..27bfbd77 100644
--- a/crates/engine/src/cmd/draw2.rs
+++ b/crates/engine/src/cmd/draw2.rs
@@ -825,20 +825,9 @@ fn reshape_segment(s: &mut Session, p: &Value) -> Result<Value> {
     s.edit("Reshape", |d, _| {
         let path = path_mut(d, id)?;
         let sp = path.subpaths.get_mut(si).ok_or_else(|| EngineError::Other("no such subpath".into()))?;
-        if seg >= sp.segment_count() {
+        if !sp.bend_segment(seg, t, dv) {
             return Err(EngineError::Other("no such segment".into()));
         }
-        let n = sp.anchors.len();
-        // Moving both inner control points by v moves B(t) by 3t(1-t)·v. A smooth anchor stays
-        // smooth: its other handle turns with the moved one.
-        let v = dv / (3.0 * t * (1.0 - t));
-        let (i0, i1) = (seg % n, (seg + 1) % n);
-        if let Some(a) = sp.anchors.get_mut(i0) {
-            a.set_handle(true, a.h_out + v, false);
-        }
-        if let Some(b) = sp.anchors.get_mut(i1) {
-            b.set_handle(false, b.h_in + v, false);
-        }
         Ok(())
     })?;
     ok()
diff --git a/crates/engine/src/cmd/live.rs b/crates/engine/src/cmd/live.rs
index baa0ffb7..70797f5e 100644
--- a/crates/engine/src/cmd/live.rs
+++ b/crates/engine/src/cmd/live.rs
@@ -14,7 +14,7 @@ use vectorcraft_doc::live::{
     PreserveShape, Spine,
 };
 use vectorcraft_doc::{Appearance, Document, Node, NodeId, NodeKind, Selection};
-use vectorcraft_geom::{Affine, PathData, Point};
+use vectorcraft_geom::{Affine, PathData, Point, Vec2};
 
 use super::edit::selected_roots;
 use super::expand::gradient_sampler;
@@ -95,6 +95,15 @@ pub fn specs() -> Vec<CommandSpec> {
             has_doc,
             spine_move_anchor
         ),
+        cmd!(
+            "object.blend.spine.reshapeSegment",
+            "Reshape Spine Segment",
+            [],
+            None,
+            "{id? (default: the selected blend), segment: index, t: 0..1, dx, dy} bend a segment of the blend's spine so its point at t moves by (dx, dy), as path.reshapeSegment bends a path's: a straight spine turns into a curve (#1111)",
+            has_doc,
+            spine_reshape_segment
+        ),
         cmd!(
             "object.blend.spine.addAnchor",
             "Add Spine Point",
@@ -640,6 +649,18 @@ fn spine_move_anchor(s: &mut Session, p: &Value) -> Result<Value> {
     ok()
 }
 
+fn spine_reshape_segment(s: &mut Session, p: &Value) -> Result<Value> {
+    const C: &str = "object.blend.spine.reshapeSegment";
+    let seg = index_param(p, "segment", C)?;
+    let t = f64_or(p, "t", 0.5).clamp(0.05, 0.95);
+    let dv = Vec2::new(f64_or(p, "dx", 0.0), f64_or(p, "dy", 0.0));
+    if !(t.is_finite() && dv.x.is_finite() && dv.y.is_finite() && dv.hypot() < 1e9) {
+        return Err(bad(C, "t, dx and dy must be finite"));
+    }
+    edit_spine(s, p, C, "Reshape Spine", |sp, _, _| if sp.bend_segment(seg, t, dv) { Ok(()) } else { Err(bad(C, "no such spine segment")) })?;
+    ok()
+}
+
 fn spine_add_anchor(s: &mut Session, p: &Value) -> Result<Value> {
     const C: &str = "object.blend.spine.addAnchor";
     let q = finite_point(p, C)?;
diff --git a/crates/engine/src/tests_blendspine.rs b/crates/engine/src/tests_blendspine.rs
index 30c4504e..ab9fc831 100644
--- a/crates/engine/src/tests_blendspine.rs
+++ b/crates/engine/src/tests_blendspine.rs
@@ -187,3 +187,20 @@ fn key_anchors_round_trip() {
     let old: BlendSpec = serde_json::from_value(json!({"spine": {"subpaths": []}})).unwrap();
     assert!(old.key_anchors.is_empty());
 }
+
+/// #1111: a straight spine's segment bends into a curve, its middle moving where it's dragged, and
+/// the steps follow it; junk segments and deltas are refused.
+#[test]
+fn a_straight_spine_segment_bends_into_a_curve() {
+    let mut s = session();
+    let (_, _, g) = blend(&mut s);
+    s.execute("object.blend.spine.reshapeSegment", &json!({"segment": 0, "t": 0.5, "dx": 0, "dy": 40})).unwrap();
+    let spine = spec(&s, g).spine.unwrap();
+    let seg = spine.subpaths[0].segment(0);
+    use vectorcraft_geom::kurbo::ParamCurve;
+    assert!(seg.eval(0.5).distance(Point::new(55.0, 45.0)) < 1e-9, "{seg:?}");
+    assert!(center(&steps(&s, g)[1]).y > 20.0, "the step follows the curve");
+    for bad in [json!({"segment": 1, "dy": 10}), json!({"segment": 0, "dx": f64::MAX, "dy": f64::MAX}), json!({"segment": -1})] {
+        assert!(s.execute("object.blend.spine.reshapeSegment", &bad).is_err(), "{bad}");
+    }
+}
diff --git a/crates/engine/tests/command_sweep.rs b/crates/engine/tests/command_sweep.rs
index ce528852..4bfd1152 100644
--- a/crates/engine/tests/command_sweep.rs
+++ b/crates/engine/tests/command_sweep.rs
@@ -367,6 +367,7 @@ fn structured_junk() {
         ("object.blend.options", json!({"spacing": "distance", "value": -1e308, "orientation": 5})),
         ("object.blend.spine.moveAnchor", json!({"id": 2, "anchor": u64::MAX, "x": 1e308, "y": -1e308, "handle": "sideways"})),
         ("object.blend.spine.addAnchor", json!({"id": u64::MAX, "x": 0, "y": 0})),
+        ("object.blend.spine.reshapeSegment", json!({"id": 2, "segment": u64::MAX, "t": f64::NAN, "dx": 1e308, "dy": -1e308})),
         ("object.blend.spine.removeAnchor", json!({"anchor": -1})),
         ("object.puppetWarp", json!({"rest": true, "pins": [], "moved": []})),
         ("object.puppetWarp", json!({"rest": true, "pins": [[1e308, 0]], "moved": [[0, 0]], "expand": -5})),
diff --git a/crates/geom/src/path.rs b/crates/geom/src/path.rs
index b8304347..4fd37352 100644
--- a/crates/geom/src/path.rs
+++ b/crates/geom/src/path.rs
@@ -252,6 +252,24 @@ impl SubPath {
             _ => a,
         }
     }
+    /// Bend segment `seg` so its point at `t` moves by `dv`: both inner control points move by
+    /// dv / 3t(1-t), since B(t) moves by 3t(1-t) times that. A smooth anchor stays smooth: its other
+    /// handle turns with the moved one. False when there is no such segment.
+    pub fn bend_segment(&mut self, seg: usize, t: f64, dv: kurbo::Vec2) -> bool {
+        let n = self.anchors.len();
+        if seg >= self.segment_count() || n == 0 {
+            return false;
+        }
+        let v = dv / (3.0 * t * (1.0 - t));
+        if let Some(a) = self.anchors.get_mut(seg % n) {
+            a.set_handle(true, a.h_out + v, false);
+        }
+        if let Some(b) = self.anchors.get_mut((seg + 1) % n) {
+            b.set_handle(false, b.h_in + v, false);
+        }
+        true
+    }
+
     /// Split segment `seg` at parameter `t`, inserting a new anchor. Returns the new anchor index.
     pub fn insert_anchor(&mut self, seg: usize, t: f64) -> usize {
         let n = self.anchors.len();
diff --git a/crates/tools/src/direct.rs b/crates/tools/src/direct.rs
index 5b72592d..b897b38c 100644
--- a/crates/tools/src/direct.rs
+++ b/crates/tools/src/direct.rs
@@ -90,6 +90,15 @@ enum State {
         start: Point,
         began: bool,
     },
+    /// Dragging a curved segment of a selected blend's spine: it follows the pointer
+    /// (`object.blend.spine.reshapeSegment`, #1111).
+    SpineSegment {
+        id: NodeId,
+        seg: usize,
+        t: f64,
+        start: Point,
+        began: bool,
+    },
     /// Dragging a handle of the clicked spine point.
     SpineHandle {
         id: NodeId,
@@ -170,6 +179,15 @@ fn hit_spine_point(cx: &ToolContext, p: Point, tol: f64) -> Option<(NodeId, usiz
     })
 }
 
+/// The segment of a selected blend's spine passing within `tol` of `p`: (blend, segment, t, whether
+/// it is straight).
+pub(crate) fn hit_spine_segment(cx: &ToolContext, p: Point, tol: f64) -> Option<(NodeId, usize, f64, bool)> {
+    spines(cx).into_iter().filter(|(id, _)| cx.selection.contains(*id)).find_map(|(id, path)| {
+        let (si, seg, t, _, dist) = path.nearest(p)?;
+        (dist <= tol).then(|| (id, seg, t, path.subpaths.get(si).is_some_and(|sp| sp.segment_is_line(seg))))
+    })
+}
+
 /// The spine point `sel` and whether `p` is on its outgoing handle's end (`Some(true)`) or its
 /// incoming one's.
 fn hit_spine_handle(cx: &ToolContext, sel: (NodeId, usize), p: Point, tol: f64) -> Option<bool> {
@@ -402,6 +420,11 @@ impl Tool for DirectSelectionTool {
                 if let Some((id, anchors)) = hit_frame_edge(cx, p, tol) {
                     return self.press_type_area(cx, id, anchors, p, ev.mods.shift);
                 }
+                // A curved segment of a selected blend's spine reshapes, as a path's does.
+                if let Some((id, seg, t, false)) = hit_spine_segment(cx, p, tol) {
+                    self.state = State::SpineSegment { id, seg, t, start: p, began: false };
+                    return vec![];
+                }
                 if let Some(out) = self.guide.press(cx, ev) {
                     self.state = State::Idle;
                     return out;
@@ -546,6 +569,22 @@ impl Tool for DirectSelectionTool {
                 out.push(Action::Preview("object.blend.spine.moveAnchor".into(), json!({"id": id.0, "anchor": anchor, "x": q.x, "y": q.y})));
                 out
             }
+            (PointerKind::Drag, State::SpineSegment { id, seg, t, start, began }) => {
+                let mut out = vec![];
+                if !began {
+                    if p.distance(start) < cx.tol(3.0) {
+                        return out;
+                    }
+                    out.push(Action::Begin("Reshape Spine".into()));
+                    self.state = State::SpineSegment { id, seg, t, start, began: true };
+                }
+                let d = p - start;
+                out.push(Action::Preview(
+                    "object.blend.spine.reshapeSegment".into(),
+                    json!({"id": id.0, "segment": seg, "t": t, "dx": d.x, "dy": d.y}),
+                ));
+                out
+            }
             (PointerKind::Drag, State::SpineHandle { id, anchor, out }) => vec![Action::Preview(
                 "object.blend.spine.moveAnchor".into(),
                 json!({"id": id.0, "anchor": anchor, "handle": if out {"out"} else {"in"}, "x": p.x, "y": p.y, "independent": ev.mods.alt}),
@@ -583,6 +622,7 @@ impl Tool for DirectSelectionTool {
                 | State::MoveObject { began, .. }
                 | State::Segment { began, .. }
                 | State::SpinePoint { began, .. }
+                | State::SpineSegment { began, .. }
                 | State::TypeArea { began, .. },
             ) => {
                 self.state = State::Idle;
@@ -814,6 +854,45 @@ mod tests {
         assert!(t.overlays(&cx).iter().any(|o| matches!(o, Overlay::Anchor { filled: true, .. })), "the clicked point shows");
     }
 
+    /// #1111: the Anchor Point tool bends a selected blend's straight spine; Direct Selection
+    /// reshapes a curved spine segment and leaves a straight one alone, as it does a path's.
+    #[test]
+    fn spine_segments_bend_with_the_anchor_point_tool_and_direct_selection() {
+        let (mut d, g, _) = blend_doc();
+        let mut s = Selection::default();
+        s.set([g]);
+        let p = paint();
+        let drag = |t: &mut dyn crate::Tool, cx: &ToolContext| {
+            t.pointer(cx, &PointerEvent::new(PointerKind::Down, 160.0, 311.0));
+            let a = t.pointer(cx, &PointerEvent::new(PointerKind::Drag, 160.0, 351.0));
+            t.pointer(cx, &PointerEvent::new(PointerKind::Up, 160.0, 351.0));
+            a
+        };
+        let straight = cx(&d, &s, &p);
+        let a = drag(crate::create("anchorPoint").as_mut(), &straight);
+        assert!(
+            matches!(a.last(), Some(Action::Preview(c, v)) if c == "object.blend.spine.reshapeSegment" && v["id"] == g.0 && v["segment"] == 0 && v["dy"] == 40.0),
+            "{a:?}"
+        );
+        let a = drag(&mut DirectSelectionTool::new(false), &straight);
+        assert!(!a.iter().any(|x| matches!(x, Action::Preview(c, _) if c == "object.blend.spine.reshapeSegment")), "straight: {a:?}");
+        // The spine bent upward: Direct Selection takes it from where it passes.
+        let mut sp = vectorcraft_geom::SubPath::polyline(&[Point::new(110.0, 310.0), Point::new(210.0, 310.0)], false);
+        sp.bend_segment(0, 0.5, vectorcraft_geom::Vec2::new(0.0, 20.0));
+        let Some(NodeKind::Blend { spec, .. }) = d.node_mut(g).map(|n| &mut n.kind) else { panic!("blend") };
+        (spec.spine, spec.key_anchors) = (Some(PathData::single(sp)), vec![0, 1]);
+        let mut t = DirectSelectionTool::new(false);
+        let curved = cx(&d, &s, &p);
+        t.pointer(&curved, &PointerEvent::new(PointerKind::Down, 160.0, 330.0));
+        let a = t.pointer(&curved, &PointerEvent::new(PointerKind::Drag, 160.0, 345.0));
+        assert_eq!(a[0], Action::Begin("Reshape Spine".into()));
+        assert!(
+            matches!(&a[1], Action::Preview(c, v) if c == "object.blend.spine.reshapeSegment" && v["segment"] == 0 && v["dx"] == 0.0 && v["dy"] == 15.0),
+            "{a:?}"
+        );
+        assert_eq!(t.pointer(&curved, &PointerEvent::new(PointerKind::Up, 160.0, 345.0)), vec![Action::Commit]);
+    }
+
     #[test]
     fn direct_and_group_selection_pick_blend_keys() {
         let (d, g, k1) = blend_doc();
diff --git a/crates/tools/src/draw2/anchor.rs b/crates/tools/src/draw2/anchor.rs
index 53bf528f..0e6cba65 100644
--- a/crates/tools/src/draw2/anchor.rs
+++ b/crates/tools/src/draw2/anchor.rs
@@ -4,7 +4,7 @@
 //! Delete: click an anchor to remove it, re-fitting the neighbouring curve (Alt = add).
 //! Anchor Point: click a smooth anchor → corner; drag an anchor → pull out smooth handles; drag a
 //! handle → move it independently (Shift: at 45° steps round its anchor); drag a segment → reshape
-//! the curve.
+//! the curve, a selected blend's spine's too, straight or curved (#1111).
 //! Scissors: click a path to split it there.
 
 use serde_json::json;
@@ -19,9 +19,30 @@ use crate::{Action, Cursor, Mods, Overlay, PointerEvent, PointerKind, Tool, Tool
 #[derive(Clone, Copy, Debug)]
 enum State {
     Idle,
-    Convert { id: NodeId, si: usize, ai: usize, start: Point, began: bool },
-    Handle { id: NodeId, si: usize, ai: usize, out: bool, began: bool },
-    Reshape { id: NodeId, si: usize, seg: usize, t: f64, start: Point, began: bool },
+    Convert {
+        id: NodeId,
+        si: usize,
+        ai: usize,
+        start: Point,
+        began: bool,
+    },
+    Handle {
+        id: NodeId,
+        si: usize,
+        ai: usize,
+        out: bool,
+        began: bool,
+    },
+    /// Bending a segment: a path's, or (`spine`) a selected blend's spine's.
+    Reshape {
+        id: NodeId,
+        si: usize,
+        seg: usize,
+        t: f64,
+        start: Point,
+        began: bool,
+        spine: bool,
+    },
 }
 
 pub struct AnchorTool {
@@ -94,7 +115,9 @@ impl Tool for AnchorTool {
                 } else if let Some((id, si, ai)) = hit_anchor(cx, p, point) {
                     self.state = State::Convert { id, si, ai, start: p, began: false };
                 } else if let Some((id, si, seg, t)) = hit_segment(cx, p, tol) {
-                    self.state = State::Reshape { id, si, seg, t, start: p, began: false };
+                    self.state = State::Reshape { id, si, seg, t, start: p, began: false, spine: false };
+                } else if let Some((id, seg, t, _)) = crate::direct::hit_spine_segment(cx, p, tol) {
+                    self.state = State::Reshape { id, si: 0, seg, t, start: p, began: false, spine: true };
                 }
                 vec![]
             }
@@ -128,6 +151,10 @@ impl Tool for AnchorTool {
                             json!({"id": id.0, "subpath": si, "anchor": ai, "which": if out { "out" } else { "in" }, "x": q.x, "y": q.y, "independent": true}),
                         )
                     }
+                    State::Reshape { id, seg, t, start, spine: true, .. } => Action::Preview(
+                        "object.blend.spine.reshapeSegment".into(),
+                        json!({"id": id.0, "segment": seg, "t": t, "dx": p.x - start.x, "dy": p.y - start.y}),
+                    ),
                     State::Reshape { id, si, seg, t, start, .. } => Action::Preview(
                         "path.reshapeSegment".into(),
                         json!({"id": id.0, "subpath": si, "segment": seg, "t": t, "dx": p.x - start.x, "dy": p.y - start.y}),
diff --git a/crates/ui-egui/src/i18n/de.tsv b/crates/ui-egui/src/i18n/de.tsv
index 4a650d90..b226dc0f 100644
--- a/crates/ui-egui/src/i18n/de.tsv
+++ b/crates/ui-egui/src/i18n/de.tsv
@@ -1545,6 +1545,7 @@
 	Move Rows	Zeilen verschieben
 	Move Slices	Slices verschieben
 	Move Spine Point	Achsenpunkt verschieben
+	Reshape Spine Segment	Achsensegment umformen
 	Move Swatch	Farbfeld verschieben
 	Move Up	Nach oben verschieben
 	Move…	Verschieben…
diff --git a/crates/ui-egui/src/i18n/es.tsv b/crates/ui-egui/src/i18n/es.tsv
index 67cbde5f..11b1c425 100644
--- a/crates/ui-egui/src/i18n/es.tsv
+++ b/crates/ui-egui/src/i18n/es.tsv
@@ -1563,6 +1563,7 @@
 	Move Rows	Mover filas
 	Move Slices	Mover sectores
 	Move Spine Point	Mover punto del eje
+	Reshape Spine Segment	Remodelar segmento del eje
 	Move Swatch	Mover muestra
 	Move Up	Subir
 	Move…	Mover…
diff --git a/crates/ui-egui/src/i18n/fr.tsv b/crates/ui-egui/src/i18n/fr.tsv
index 0b6067e7..f3248750 100644
--- a/crates/ui-egui/src/i18n/fr.tsv
+++ b/crates/ui-egui/src/i18n/fr.tsv
@@ -1562,6 +1562,7 @@
 	Move Rows	Déplacer les lignes
 	Move Slices	Déplacer les tranches
 	Move Spine Point	Déplacer le point de la dorsale
+	Reshape Spine Segment	Modeler le segment de la dorsale
 	Move Swatch	Déplacer la nuance
 	Move Up	Monter
 	Move…	Déplacer…
diff --git a/crates/ui-egui/src/i18n/it.tsv b/crates/ui-egui/src/i18n/it.tsv
index 249513a5..493dbc71 100644
--- a/crates/ui-egui/src/i18n/it.tsv
+++ b/crates/ui-egui/src/i18n/it.tsv
@@ -1563,6 +1563,7 @@
 	Move Rows	Sposta righe
 	Move Slices	Sposta sezioni
 	Move Spine Point	Sposta punto dorsale
+	Reshape Spine Segment	Rimodella segmento della dorsale
 	Move Swatch	Sposta campione
 	Move Up	Sposta su
 	Move…	Sposta…
diff --git a/crates/ui-egui/src/i18n/ja.tsv b/crates/ui-egui/src/i18n/ja.tsv
index 00c4aef4..8cc2c606 100644
--- a/crates/ui-egui/src/i18n/ja.tsv
+++ b/crates/ui-egui/src/i18n/ja.tsv
@@ -1697,6 +1697,7 @@
 	Move Rows	行を移動
 	Move Slices	スライスを移動
 	Move Spine Point	スパインポイントを移動
+	Reshape Spine Segment	スパインセグメントをシェイプ変形
 	Move Swatch	スウォッチを移動
 	Move Up	上へ移動
 	Move in Perspective	遠近で移動
diff --git a/crates/ui-egui/src/i18n/pt-br.tsv b/crates/ui-egui/src/i18n/pt-br.tsv
index 59469824..5eb1e67c 100644
--- a/crates/ui-egui/src/i18n/pt-br.tsv
+++ b/crates/ui-egui/src/i18n/pt-br.tsv
@@ -1334,6 +1334,7 @@
 	Move Plane to Match Object	Mover Plano para Corresponder ao Objeto
 	Move Slices	Mover Fatias
 	Move Spine Point	Mover Ponto de Coluna
+	Reshape Spine Segment	Remodelar Segmento da Coluna
 	Move Swatch	Mover Amostra
 	Move Up	Mover para Cima
 	Move in Perspective	Mover em Perspectiva
diff --git a/crates/ui-egui/src/i18n/ru.tsv b/crates/ui-egui/src/i18n/ru.tsv
index e593550b..452c41cf 100644
--- a/crates/ui-egui/src/i18n/ru.tsv
+++ b/crates/ui-egui/src/i18n/ru.tsv
@@ -1561,6 +1561,7 @@
 	Move Rows	Переместить строки
 	Move Slices	Переместить фрагменты
 	Move Spine Point	Переместить точку остова
+	Reshape Spine Segment	Изменить форму сегмента остова
 	Move Swatch	Переместить образец
 	Move Up	Переместить вверх
 	Move…	Переместить…
diff --git a/crates/ui-egui/src/i18n/uk.tsv b/crates/ui-egui/src/i18n/uk.tsv
index 3051a88f..c5eb785f 100644
--- a/crates/ui-egui/src/i18n/uk.tsv
+++ b/crates/ui-egui/src/i18n/uk.tsv
@@ -1557,6 +1557,7 @@
 	Move Rows	Перемістити рядки
 	Move Slices	Перемістити фрагменти
 	Move Spine Point	Перемістити точку осі
+	Reshape Spine Segment	Змінити форму сегмента осі
 	Move Swatch	Перемістити зразок
 	Move Up	Перемістити вгору
 	Move…	Перемістити…
diff --git a/crates/ui-egui/src/i18n/zh-hans.tsv b/crates/ui-egui/src/i18n/zh-hans.tsv
index 55c6feef..5e557590 100644
--- a/crates/ui-egui/src/i18n/zh-hans.tsv
+++ b/crates/ui-egui/src/i18n/zh-hans.tsv
@@ -1494,6 +1494,7 @@
 	Move Plane to Match Object	移动平面以符合对象
 	Move Slices	移动切片
 	Move Spine Point	移动脊线点
+	Reshape Spine Segment	整形脊线线段
 	Move Swatch	移动色板
 	Move Up	上移
 	Move…	移动…
diff --git a/crates/ui-egui/src/i18n/zh-hant.tsv b/crates/ui-egui/src/i18n/zh-hant.tsv
index 87683136..7489337c 100644
--- a/crates/ui-egui/src/i18n/zh-hant.tsv
+++ b/crates/ui-egui/src/i18n/zh-hant.tsv
@@ -1538,6 +1538,7 @@
 	Move Rows	移動列
 	Move Slices	移動切片
 	Move Spine Point	移動脊線點
+	Reshape Spine Segment	改變脊線線段外框
 	Move Swatch	移動色票
 	Move Up	上移
 	Move…	移動…
diff --git a/docs/control-protocol.md b/docs/control-protocol.md
index 3c564457..ae74a8dc 100644
--- a/docs/control-protocol.md
+++ b/docs/control-protocol.md
@@ -692,7 +692,9 @@ new blends start with. The Blend tool (`ui.tool.select {tool: "blend"}`): `ui.po
 another, blends them; down on an anchor point blends from that point; each further object clicked joins the blend.
 A selected blend shows its spine. With Direct Selection (`directSelection`) a `ui.pointer` drag from a spine point
 moves it (`object.blend.spine.moveAnchor`, one undo step) and, once a point is clicked, from one of its handles
-reshapes the curve; Direct and Group Selection pick a blend's key objects. With the Pen tool a click on a selected
+reshapes the curve, and a drag on a curved spine segment bends it (`object.blend.spine.reshapeSegment`); the Anchor
+Point tool (`anchorPoint`) bends any segment of a selected blend's spine, straight ones too. Direct and Group Selection
+pick a blend's key objects. With the Pen tool a click on a selected
 blend's spine adds a point (on a point no key sits on, deletes it).
 
 Perspective grid view options: View → Perspective Grid lists Show/Hide Grid, Show/Hide Rulers, Snap to Grid
diff --git a/docs/mcp.md b/docs/mcp.md
index 8b48eed2..d399b352 100644
--- a/docs/mcp.md
+++ b/docs/mcp.md
@@ -3077,8 +3077,9 @@ among the objects takes the others in as more key objects, keeping its options,
 A blend's spine is the straight lines between its key centres until it is edited. `object.blend.info` lists it
 (`spine.anchors`, `keyAnchors`: the point each key sits on). `object.blend.spine.addAnchor {x, y}` adds a point where
 the spine passes nearest, `object.blend.spine.moveAnchor {anchor, x, y}` moves a point (a key on it moves along; with
-`handle: "in" | "out"` it places that handle) and `object.blend.spine.removeAnchor {anchor}` deletes a point no key
-sits on; the first edit turns the spine into a path. Moving a key moves its end of the spine. Release
+`handle: "in" | "out"` it places that handle), `object.blend.spine.reshapeSegment {segment, t, dx, dy}` bends a segment
+so its point at `t` moves by (dx, dy), turning a straight spine into a curve, and `object.blend.spine.removeAnchor
+{anchor}` deletes a point no key sits on; the first edit turns the spine into a path. Moving a key moves its end of the spine. Release
 (`object.blend.release`) leaves the spine as a path that paints nothing (`spines` in the result):
 
 ```json