browser.visibility hides and shows sketches, bodies, construction geometry and origin items (items: ids or names, or a whole folder; visible: bool), so agents can hide helper sketches over MCP. What is hidden moved from the egui UI state into the engine session (view state: not saved, not an undo step); the desktop eye toggles and menus use it, headless renders and fit leave hidden items out, and document.inspect, sketch.inspect and ui.inspect report visibility. ui.set still accepts hiddenBodies, hiddenOrigin, hiddenSketches and shownSketches. Tests: helper sketches hide and show in the engine (hostile input changes nothing) and through MCP only

docs/control-protocol.md

@@ -21,8 +21,8 @@ Commands never open dialogs when run this way. `solvecraft-cli commands` prints
 
 | Method | Params | Notes |
 |---|---|---|
-| `ui.inspect` | — | UI state, viewport rect, camera, active tool/dialog, hover, renderer, timings, live preview (`active`, `busy`, `error`, `ms`, bodies it stands in for) |
-| `ui.set` | any `UiState` field (`tab`, `perspective`, `showGrid`, `hiddenBodies`, `dark`, …) | `dark: false` switches to the light theme |
+| `ui.inspect` | — | UI state, what is hidden (`visibility`: bodies, origin and construction items, sketches; set it with the `browser.visibility` command), viewport rect, camera, active tool/dialog, hover, renderer, timings, live preview (`active`, `busy`, `error`, `ms`, bodies it stands in for) |
+| `ui.set` | any `UiState` field (`tab`, `perspective`, `showGrid`, `dark`, …), and `hiddenBodies`, `hiddenOrigin`, `hiddenSketches`, `shownSketches` (whole lists; `browser.visibility` changes single items) | `dark: false` switches to the light theme |
 | `ui.view` | `view`: `front`, `back`, `top`, `bottom`, `left`, `right`, `iso`, `home`, `fit`; `animate` (bool, default false: snap) | |
 | `ui.start` | `command` | like a toolbar click: starts the sketch tool or dialog for the command |
 | `ui.click` | `x`, `y` (screen points), `button?`: left/right/middle, `shift?`, `ctrl?`, `double?` | real pointer input |

docs/mcp.md

@@ -51,7 +51,7 @@ Claude Desktop (`claude_desktop_config.json`), bridged to a running app:
 | `list_commands` | `filter?` | The command catalog: id, label, tab/panel, shortcut, parameter docs, enabled now. |
 | `execute` | `command`, `params?` | Run any command with JSON parameters (`list_commands` shows them). Failures leave the design unchanged. |
 | `batch` | `commands: [{command, params}]`, `rollback?` (default true) | Run steps in order, stop at the first error and undo the completed steps. The reply names the failing step (`failed.index`, `failed.command`, `failed.error`) and every result before it. |
-| `inspect_design` | `measure?` (default true), `sketches?` (default true) | Parameters, timeline (type, suppressed, rolled back, error, warning, timing), bodies (volume, area, centre of mass, bbox, face/edge/vertex counts), sketches (curves, points, constraints, profiles, DOF, solve status), selection, undo depth. |
+| `inspect_design` | `measure?` (default true), `sketches?` (default true) | Parameters, timeline (type, suppressed, rolled back, error, warning, timing), bodies (volume, area, centre of mass, bbox, face/edge/vertex counts, visible), sketches (curves, points, constraints, profiles, DOF, solve status, visible), selection, undo depth. Hide helper sketches, bodies or construction planes with `execute` `browser.visibility` (`{items, visible}` or `{folder, visible}`). |
 | `measure` | `body?` | Volume (mm³), area (mm²), centre of mass, bbox and topology counts per body, with totals. |
 | `body_topology` | `body` | Edges (index, midpoint, length, ends) and faces (index, area, centroid, normal). An edge midpoint is the `[x,y,z]` that picks that edge for fillet and chamfer. |
 | `set_parameter` | `name`, `value` (number or expression), `unit?`, `comment?` | Create or change a user parameter and recompute; reports features that now fail. |