Add-ons: Path Precision Tools — Corner Tool and Slide Anchor

Path Precision Tools gains two tools, kept out of the toolbars (All Tools
drawer and Object › Plug-ins › Path Precision Tools, no shortcuts):

- Corner Tool (cornerTool): editable corners on any path through the
  existing Live Corners. Hover shows an eligible anchor, a click cuts a
  corner with the tool's radius and kind, a drag sizes it (Shift: whole
  values), a corner's marker selects it and loads its values, resizes it
  and removes it at 0 or on a double-click; a corner never grows past
  what fits; an Alt-marquee cuts every eligible anchor inside.
- Corners section in the Anchor Inspector: radius, kind, selected count,
  Apply to Selected Anchors.
- Slide Anchor Along Path (slideAnchor): a drag runs an anchor along its
  curve, the neighbouring segments refitted by the keep-shape kernel;
  Shift snaps where the tangent is a multiple of 45° from the constrain
  angle.
- Commands addon.pathtools.cornerSet, cornerRemove and slideAnchor, one
  undo step each, params validated and covered by the command sweep.
- Cursor stand-ins, catalog rows in every language, docs and tests.

docs/mcp.md

@@ -5789,9 +5789,9 @@ type and evening out horizontal scales are not there yet.
 Path Precision Tools is a built-in add-on for exact anchor and path work: its commands are `addon.pathtools.*`, and in
 the desktop app it lives in Object › Plug-ins › Path Precision Tools, in its Anchor Inspector panel
 (`window.panel {panel: "anchorInspector"}`), in its Parametric Shape panel (`window.panel {panel: "parametricShape"}`)
-and in four tools that the toolbars don't show until they are added from the All Tools drawer (or chosen with
-`tool.select`): `anchorEraserBrush`, `extendPath`, `measureInspect` and `parametricShape`. None has a shortcut. Each edit
-is one undo step, and an edit that changes nothing makes no step.
+and in six tools that the toolbars don't show until they are added from the All Tools drawer (or chosen with
+`tool.select`): `anchorEraserBrush`, `extendPath`, `measureInspect`, `parametricShape`, `cornerTool` and `slideAnchor`.
+None has a shortcut. Each edit is one undo step, and an edit that changes nothing makes no step.
 
 Tools:
 
@@ -5814,6 +5814,19 @@ Tools:
   gear's tooth height, an arrow's head, a cross's bar, a heart's notch, a bubble's tail tip); each drag runs
   `addon.pathtools.shape.set`. A double-click on the canvas places a shape with the last settings. Options
   (`tool.setOption`, or the panel with no shape selected) are the next shape's numbers, as the commands take them.
+- **Corner Tool** (`cornerTool`, or the UI command `addon.pathtools.cornerTool`, which also shows the Anchor Inspector
+  panel with its Corners section): edits the app's Live Corners on any path, selected or not. Over an anchor where two
+  sides meet at an angle the anchor shows; a click runs `addon.pathtools.cornerSet` with the tool's `radius` (pt, 10)
+  and `kind` (`round`, `invertedRound` or `chamfer`), and a drag from it sizes the corner (Shift: whole values of the
+  ruler's unit; no larger than fits). A cut corner shows a marker at the centre of its cut: a click selects the corner
+  and loads its radius and kind into the tool, a drag resizes it (to 0 it goes), a double-click removes it. An Alt-drag
+  cuts corners on every anchor in the marquee, replacing those there; a plain marquee selects the corners inside (Shift
+  toggles), and a click away deselects. The panel section sets `radius` and `kind`, counts the selected corners and has
+  Apply to Selected Anchors.
+- **Slide Anchor Along Path** (`slideAnchor`): a drag on an anchor runs `addon.pathtools.slideAnchor`, previewed while
+  dragging: the anchor runs along the curve it sits on, as far as just short of its neighbours, and the two segments
+  beside it are refitted. Shift snaps to where the path's tangent is at a multiple of 45° from the Constrain Angle. Ends
+  of open paths don't slide.
 
 Commands:
 
@@ -5846,6 +5859,19 @@ Commands:
 - `addon.pathtools.crossings {cut?, selfCrossings?, ids?}` adds anchors where the selected paths cross one another (and
   where each crosses itself, with `selfCrossings`), or with `cut` also cuts them there: a path of one subpath becomes a
   path per piece. Paths that meet at a shared anchor don't cross there; at most 10,000 segments at once.
+- `addon.pathtools.cornerSet {ids?, anchors?, items?, radius, kind?}` cuts live corners, the ones Direct Selection's
+  corner widgets and the Corners dialog edit, as one undo step. `ids` (default: the selection) are the paths and
+  `anchors` the anchor indices of each path's outline with no corners cut; without `anchors`, a path's direct-selected
+  anchors, or all of them. `items: [{id, anchors?}…]` gives each path its own instead. Only anchors where two sides meet
+  at an angle take a corner: smooth anchors and open ends are skipped, and it is an error if none is left. `radius` is
+  0 to 1,000,000 pt, drawn no larger than fits; `kind` is `round`, `invertedRound` or `chamfer` (default: each corner's
+  own). → `{ids, corners}`.
+- `addon.pathtools.cornerRemove {ids?, anchors?, items?}` makes those corners sharp again, as one undo step; a plain path
+  with none left is plain again. → `{ids, corners}`.
+- `addon.pathtools.slideAnchor {id, subpath?, anchor, t}` moves an anchor along its path, the segments beside it refitted
+  so the outline stays (the anchor count and index stay). `t`, -0.98 to 0.98, says where: positive, a curve parameter on
+  the segment after the anchor; negative, back from the end of the one before. An anchor at a sharp corner loses it, as
+  the corner isn't on the way. → `{id, strayed}`, how far the outline moved in points.
 - `addon.pathtools.shape.create {center, kind?, width?, height?, rotation?, count?, a?, b?, radius?}` draws a parametric
   shape with the current paint, selected. `kind`: `rectangle`, `ellipse`, `polygon` (default), `star`, `ring`, `arrow`,
   `cross`, `heart`, `gear` or `bubble` (a speech bubble). `width` and `height` are 0.01 to 16,384 pt (100);

docs/target-app-parity.md

@@ -1,6 +1,6 @@
 # Parity with Adobe Illustrator
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-31 · **Change:** minor (Artwork Cleanup add-on: text tools; scores unchanged) · **Target:** Adobe Illustrator 2026 (30.x; public release notes through 30.7, August 2026)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-31 · **Change:** minor (Path Precision Tools add-on: Corner Tool and Slide Anchor Along Path; scores unchanged) · **Target:** Adobe Illustrator 2026 (30.x; public release notes through 30.7, August 2026)
 
 ## Feature submission evidence
 
@@ -1263,6 +1263,19 @@ stored data), `cmd::addons::pathtools::tests` in `vectorcraft-engine` (each comm
 anchor edits and transforms, the SVG export filter, the tool's gestures), `addons::pathtools::tests` in
 `vectorcraft-ui-egui` (submenu and panel) and `command_sweep`.
 
+The add-on's Corner Tool (2026-10-31) edits the Live Corners every path already keeps (no second corner store): hover
+shows an anchor that can take a corner, a click cuts one with the tool's radius and kind (round, inverted, chamfer), a
+drag sizes it (Shift: whole values), a cut corner's marker selects it and loads its values, resizes it, and removes it
+at 0 or on a double-click, a corner never grows past what fits, and an Alt-marquee cuts every eligible anchor inside. A
+Corners section in the Anchor Inspector sets the radius and kind, counts the selected corners and applies to them.
+Slide Anchor Along Path drags an anchor along its curve, the two segments beside it refitted by the keep-shape kernel
+(Shift: where the tangent is a multiple of 45°). Commands `addon.pathtools.cornerSet`, `cornerRemove` and `slideAnchor`,
+each one undo step; `vectorcraft_pathops::addons::pathtools::slide_anchor`. Tests: `addons::pathtools` in
+`vectorcraft-pathops` (the outline stays within 0.05 pt on a circle, straight runs, ends, stops), `addons::corner_tool`
+and `addons::slide_anchor` in `vectorcraft-tools`, `cmd::addons::pathtools::tests` in `vectorcraft-engine` (each command
+one undo step, bad params refused, the tools' gestures), `addons::pathtools::tests` in `vectorcraft-ui-egui` (submenu,
+panel section), `edit_toolbar::tests` and `command_sweep`.
+
 ## Smart Pen add-on (2026-10-30)
 
 A VectorCraft addition, not an Illustrator feature, so no area score moves. Object › Plug-ins › Smart Pen selects the
@@ -1311,6 +1324,7 @@ add-on.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-31 | minor | Path Precision Tools add-on: the Corner Tool and Slide Anchor Along Path; evidence added; scores unchanged. |
 | 2026-10-30 | minor | File formats: `.ai`/EPS editing-data fidelity from an audit of a user's files: All Caps and Small Caps (#4708); placed files at their box's corner, kept where they draw closer to the page (#4664, #4723, #4742); pages cropped to the art, with `UserUnit` (#4658, #4727); gradient mesh corners with handle weights of 0 and the state written after a mesh (#4738, #4744, #4748); type on a path spaced as the file lays it out (#4743); synthetic regressions in `crates/eps`; evidence added; scores unchanged. |
 | 2026-10-31 | minor | Artwork Cleanup add-on (a VectorCraft addition): text tools; evidence added; scores unchanged. |
 | 2026-10-30 | minor | Color Effects add-on: live Duotone (one to four inks, spot tones kept) and Print Ink Fixes; scores and estimates unchanged |

docs/ui-parity.md

@@ -1,6 +1,6 @@
 # UI and interaction parity
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-31 · **Change:** minor (Artwork Cleanup add-on: text tools; scores unchanged) · **Target:** Adobe Illustrator 2026 (30.x)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-31 · **Change:** minor (Path Precision Tools add-on: Corner Tool and Slide Anchor Along Path; scores unchanged) · **Target:** Adobe Illustrator 2026 (30.x)
 
 ## Feature submission evidence
 
@@ -326,7 +326,7 @@ next unit in the order a right-click on a ruler lists them, from Feet back to Po
 | Tabs panel: a stop drags from where the press landed, a stop just added included | done | #1458 |
 | Outline view keeps template layers in Preview, dimmed | done | #1486; a picture placed to be traced stays visible under the outlines |
 | Smart Pen add-on (VectorCraft addition): Object › Plug-ins › Smart Pen selects the Smart Pen Tool, which the All Tools drawer lists under its own heading but neither toolbar shows as shipped (no shortcut), and opens the Smart Pen panel (next segment straight or curved; Remove Points Keep Shape, Make Smooth, Make Corner, Retract Handles, Close or Join). The tool draws (click: straight or curved segment, a curve after a straight one tangent; drag: smooth anchor, Alt breaks the handle, Shift 45°, Space moves it; Tab switches a segment; rubber band; close, join, continue) and edits without switching tools (click selects a point, drag moves it, Alt-click removes it keeping the shape, Shift+Alt-click deletes it, double-click toggles smooth/corner; handle drags with Shift and Alt; segment drags reshape, Alt-click adds a point) | done | `addon.pen.*`, `crates/tools/src/addons/smart_pen.rs`, `crates/ui-egui/src/addons/pen.rs` and their tests; not an Illustrator feature, so it is not scored |
-| Path Precision Tools add-on (VectorCraft addition): Object › Plug-ins › Path Precision Tools selects its four tools (Anchor Eraser Brush, Extend Path, Measure & Inspect, Parametric Shape), which the All Tools drawer lists under their own heading but neither toolbar shows as shipped, opens the Anchor Inspector panel (the selected anchor's X/Y and handle lengths and angles as fields; Make Smooth, Make Corner, Equalize Handles, Remove Points Keep Shape, Add Points, the three ways to close) and the Parametric Shape panel (kind, count, W/H, rotation, the kind's own values and corner radius of the selected parametric shape, or of the tool's next one), and runs Add Points at / Split at Crossings and Convert to Parametric Shape; the Parametric Shape Tool draws ten re-editable kinds from the centre (↑/↓ and ←/→ change their numbers while dragging) and edits a selected one with handles; a double-click on the brush or Extend Path tool opens its options | done | `addon.pathtools.*`, `crates/tools/src/addons/`, `crates/ui-egui/src/addons/pathtools.rs`, `crates/ui-egui/src/addons/pathtools/shape.rs` and their tests; not an Illustrator feature, so it is not scored |
+| Path Precision Tools add-on (VectorCraft addition): Object › Plug-ins › Path Precision Tools selects its six tools (Anchor Eraser Brush, Extend Path, Measure & Inspect, Parametric Shape, Corner Tool, Slide Anchor Along Path), which the All Tools drawer lists under their own heading but neither toolbar shows as shipped, opens the Anchor Inspector panel (the selected anchor's X/Y and handle lengths and angles as fields; Make Smooth, Make Corner, Equalize Handles, Remove Points Keep Shape, Add Points, the three ways to close) and the Parametric Shape panel (kind, count, W/H, rotation, the kind's own values and corner radius of the selected parametric shape, or of the tool's next one), and runs Add Points at / Split at Crossings and Convert to Parametric Shape; the Parametric Shape Tool draws ten re-editable kinds from the centre (↑/↓ and ←/→ change their numbers while dragging) and edits a selected one with handles; the Corner Tool cuts editable corners on any path (hover shows the anchor, a click uses its radius and kind, a drag sizes the corner, Shift whole values; a corner's marker selects it and loads its values, drags to resize, to 0 or double-clicked removes it; never past what fits; Alt-marquee cuts every anchor inside) with a Corners section in the Anchor Inspector (radius, kind, selected count, Apply to Selected Anchors); Slide Anchor Along Path drags an anchor along its curve with the segments beside it refitted, Shift snapping where the tangent is a multiple of 45°; a double-click on the brush or Extend Path tool opens its options | done | `addon.pathtools.*`, `crates/tools/src/addons/`, `crates/ui-egui/src/addons/pathtools.rs`, `crates/ui-egui/src/addons/pathtools/` and their tests; not an Illustrator feature, so it is not scored |
 | Smart Pen add-on (VectorCraft addition): Object › Plug-ins › Smart Pen selects the Smart Pen Tool, which the All Tools drawer lists under its own heading but neither toolbar shows as shipped (no shortcut), and opens the Smart Pen panel (next segment straight or curved; Remove Points Keep Shape, Make Smooth, Make Corner, Retract Handles, Close or Join). The tool draws (click: straight or curved segment, a curve after a straight one tangent; drag: smooth anchor, Alt breaks the handle, Shift 45°, Space moves it; Tab switches a segment; rubber band; close, join, continue) and edits without switching tools (click selects a point, drag moves it, Alt-click removes it keeping the shape, Shift+Alt-click deletes it, double-click toggles smooth/corner; handle drags with Shift and Alt; segment drags reshape, Alt-click adds a point); an Alt-drag away from paths selects the points inside a marquee | done | `addon.pen.*`, `crates/tools/src/addons/smart_pen.rs`, `crates/ui-egui/src/addons/pen.rs` and their tests; not an Illustrator feature, so it is not scored |
 | Path Precision Tools add-on (VectorCraft addition): Object › Plug-ins › Path Precision Tools selects its three tools (Anchor Eraser Brush, Extend Path, Measure & Inspect), which the All Tools drawer lists under their own heading but neither toolbar shows as shipped, opens the Anchor Inspector panel (the selected anchor's X/Y and handle lengths and angles as fields; Make Smooth, Make Corner, Equalize Handles, Remove Points Keep Shape, Add Points, the three ways to close) and runs Add Points at / Split at Crossings; a double-click on the brush or Extend Path tool opens its options | done | `addon.pathtools.*`, `crates/tools/src/addons/`, `crates/ui-egui/src/addons/pathtools.rs` and their tests; not an Illustrator feature, so it is not scored |
 | Artwork Cleanup add-on (VectorCraft addition): Object › Plug-ins › Artwork Cleanup opens its panel, which checks the selection or the document for 16 kinds of issue, lists them with counts, and shows or fixes the picked rows or all of them, each fix one undo step; Simplify Anchors (Keep Shape), Rejoin Path Pieces and Deep Ungroup open their options first | done | `addon.cleanup.*`, `crates/ui-egui/src/addons/cleanup.rs` and its tests; not an Illustrator feature, so it is not scored |
@@ -372,6 +372,7 @@ separate. Scores and hours unchanged. [Behavior and command details](development
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-31 | minor | Path Precision Tools add-on: the Corner Tool (editable corners, panel section) and Slide Anchor Along Path; scores and estimates unchanged |
 | 2026-10-31 | minor | Artwork Cleanup add-on (a VectorCraft addition): its text tools in the panel and Object › Plug-ins › Artwork Cleanup; scores and estimates unchanged |
 | 2026-10-30 | minor | Color Effects add-on: live Duotone (one to four inks, spot tones kept) and Print Ink Fixes; scores and estimates unchanged |
 | 2026-10-30 | minor | Color Effects add-on: live Vector Halftone; scores and estimates unchanged |