* feat: author behaviours on main components
A main component or component set can behave as a Switch, Checkbox,
Slider, or Tabs, after Reka UI's primitives. The behaviour lives in
OpenPencil plugin data: boolean values bind to variant or boolean
properties with the values meaning on and off, a number keeps its own
range since Figma has no number property, and the control's
subcomponents bind to the component's slots. A Behaviour section in the
properties panel adds, binds, and removes it, each as one undo step,
and flags required bindings that are missing. The canvas-only layout's
pill becomes a component that preview will reuse.
* feat: preview instances with behaviours on the canvas
View > Preview (Cmd+Alt+Enter) puts the canvas in preview: a lone canvas
switches to the canvas-only layout with a Previewing pill, and a split
canvas previews on its own side. Clicking a Switch or Checkbox flips it,
dragging a Slider moves its thumb and range, and clicking a Tabs trigger
shows its panel. Preview keeps its state on copies of the instances it
touched, in a private graph with the document's ids, and the canvas
draws those copies in place of the originals, so the document, undo,
autosave, and collaborators never see it. Escape or the pill leaves
preview, Reset restores every control, and editing shortcuts, labels,
and outlines stay off while previewing.
* feat: translate behaviour and preview strings; cover preview with an e2e flow
* refactor(vue): reuse VariantDefinitionControl for behaviour property options
* refactor: split variant actions and preview interactions by domain
Variant authoring was one 706-line closure; it is now graph queries
(model), undo snapshots (history), property definition edits
(definitions), and the editor facade (index). Preview interactions move
into play/kinds, one module per control, registered by behaviour kind so
a new kind cannot ship without its contract and interaction. Behaviour
contracts are keyed by kind. In the Vue SDK, slot and variant authoring
controls get their own folders beside component-props and behaviour,
and the app's variant section joins slot/ and behaviour/.
* refactor: keep the behaviour model in scene-graph's plugin-data registry
Master now defines every OpenPencil plugin-data key in one typed registry
in scene-graph. The behaviour schema registers there as a field, and the
model and contracts move beside slots, exported from the package root;
the @open-pencil/core/behaviours subpath is gone.
* feat: interaction states and keyboard focus in preview
A behaviour can bind a variant property to the default, hover, pressed,
focus, and disabled states; binding it maps values named like those
states. Preview switches the instance's copy to the matching variant as
the pointer hovers, presses, and releases, keeps other values when the
set draws the combination and falls back to rest otherwise, and skips
disabled instances. Tab moves visible keyboard focus between controls,
Space, Enter, arrows, Home, and End use the focused one, and Escape
takes visible focus off before leaving preview. A Button kind covers
controls that only have states.
* feat: toggle, radio, group, progress, collapsible, and accordion behaviours
Radio group, toggle group, and accordion hold their items in a slot;
each item is an instance with its own behaviour, so a press inside the
slot goes to the group, which turns the pressed item on and the others
off through the item's own interaction. Progress shares the slider's
number handling through rangeControl, and a collapsible shows and hides
its content slot from its trigger, remembering its open state even
when no property draws it. Tabs and groups share arrow-key navigation.
* feat: text field, textarea, and number field behaviours
A behaviour value can now be text, bound to a text property, so
preview types into a copy of the field through the same property path
the editor uses. A bound Filled value switches to the placeholder
variant when the field empties. A number field keeps its own range,
shows its value through a text property, and steps from its increment
and decrement slots and the arrow keys. Text fields show focus from a
click, and the focused control receives every key; Option still types,
and only Cmd or Ctrl combinations stay shortcuts.
* fix: keep behaviour bindings when saving as .fig
Saving as .fig gives component properties new GUIDs, but behaviours
kept the old ids in their plugin data, so every binding read as missing
after reopening. The export now renames the ids behaviours bind with
the same GUIDs, on its own copy of the document.
* fix: let previewed controls resize layout imported from .fig
Layers from a .fig keep the sizes Figma computed, and auto layout
prefers them, so an opened collapsible or accordion item kept its
closed height in preview. When preview shows, hides, or retypes a
layer in a copy, it drops those sizes from the layer's copied ancestors
so auto layout sizes them again; untouched layers keep Figma's sizes.
* fix: publish behaviours and other plugin content with library assets
Every OpenPencil plugin-data field now declares its role: content that
exists only as plugin data (behaviours, OkHCL picks), format copies of
node fields written for files, or bookkeeping about where a document
or node came from. Library snapshots keep a node's content plugin data,
including other plugins' entries, and drop the rest; the asset hash
counts the same entries, so a behaviour-only change is offered as an
update while a .fig round trip still changes nothing.
* feat: name behaviour rows by meaning and create what they need
The Behaviour section named every main value "Value" under a "Values"
heading, and a component without matching properties left an empty
picker with no way forward. Rows are now named for the control (On,
Checked, Pressed, Text), rows the control needs or already uses come
first, and the optional rest folds under More options; a button keeps
its states in view. An empty row creates what it needs in one undo
step: a text layer and text property, Off and On variants on a set, or
a slot frame for a part. The missing chip names the row it means and
takes you there.
* fix(dom-css): position free layers, hug content, and round ellipses
HTML and Tailwind export stacked the layers of frames without auto
layout in block flow, wrote fixed pixel sizes for auto layout frames
set to Hug and for auto-sizing text, and drew ellipses as boxes. Layers
a parent does not lay out are now absolutely positioned at their
coordinates inside a relative frame, hugging axes are left to the
content, and ellipses get a 50% radius.
* feat: run preview as live Reka UI islands over the canvas
Preview simulated controls on the canvas: copies of instances, a
handler per kind, its own key routing, and append-only text. It now
runs them as real components. Each top-level layer that holds an
instance with a behaviour becomes an island: its layers are projected
to DOM through dom-css into a shadow root laid over the pane at its pan
and zoom, and each behaviour mounts its Reka UI primitives on its
layers, so text fields are real inputs and focus, keys, and layout are
the browser's. Core's resolvePlayState shows instances in a state on a
private graph, so the component's variants draw it, and controls are
keyed by layer path so a variant switch keeps their DOM. The canvas
leaves island layers to the islands, and the canvas play runtime and
its key routing are gone.
* fix: derive variant properties from Property=Value component names
figma.combineAsVariants and Combine as variants only derived variant
properties from slash-separated names, so components named as Figma
names variants, such as State=On, Size=Large, became a set with no
properties. Both now derive each named property and its values, after
the slash form.
* feat: script and tool access to behaviours by name
Behaviour contracts follow Reka UI's anatomy: tabs keep their triggers
in the list slot and their content panels in a panels slot, and a slot
of repeated parts names the Reka part of its children. A behaviour
spec names component properties and slots instead of ids and resolves
to the stored behaviour and back, with errors that list what the
component has.
Scripts get an `openpencil` global next to `figma`, in the Figma API's
style: setBehaviour, getBehaviour with bindValue, bindPart, states,
and missing, behaviourKinds, and createSlot. The eval tool, the CLI,
and app automation compile scripts through one compileScript, so the
CLI now returns the last expression as the others do. MCP and AI chat
get set_behaviour, get_behaviour, and create_slot.
* feat: write controls in design JSX with Reka UI's element names
`<Switch.Root modelValue="State">` renders a main component, or a set
when its children are variants, that behaves as a switch, and
`<Switch.Thumb>` the slot that draws its thumb, one slot across the
set's variants. Inputs become the text property of a field, tab
triggers and panels go in their List and Panels slots, and a group's
items are `<RadioGroup.Item of={…} />` instances in its Items slot.
JSX export writes components with behaviours the same way, so they
render back unchanged. The authoring reference documents controls, and
the codegen and chat prompts now include it verbatim instead of
dedenting its code examples.
* chore: format the CLI export test
* docs: document slots, behaviours, preview, and the openpencil API
The components guide covers slots, behaviours, and preview with its
shortcut; scripting covers the openpencil global and eval's last-
expression result; the MCP and AI chat pages list the new tools; the
features overview, README, and roadmap mention working controls. The
chat prompt says how to build a control, and the codegen prompt builds
components with behaviours on their Reka UI primitives.
* chore: format the eval CLI test
* docs: explain behaviours and preview islands, and guide the openpencil API
A development page explains the behaviour model, the four authoring
surfaces, how preview islands turn a control's state into live Reka UI
components, and how to add a kind; the architecture page links it. The
Core guide sets the rules for OpenPencilAPI: Figma-only `figma`,
OpenPencil features on `openpencil` in the same style, one
compileScript, names over ids, and docs with every member. Package
READMEs mention the openpencil global, PlayIslands, Reka-named JSX, and
the behaviour model. Design JSX's behaviour modules move into a
behaviours folder instead of a suffixed sibling.
* refactor: center pasted layers through translate
centerNodesAt repeated translate's loop, which test:dupes reports on
master too.
* fix: validate behaviour ranges and guess on and off by name
A number value now needs max above min and a positive step: the schema,
specs, and the panel reject a range a slider cannot step through. Binding
a variant property guesses on and off by value name, as specs do, and a
boolean property gets no on/off pair. Part bindings are read through
partBinding, a replaced document restarts preview from its designed
state, and the e2e preview shortcut uses ControlOrMeta.
* feat: make the Behaviour section say what to do next
A slider's range fields now carry inline Min, Max, Step, and Start labels.
States offers Add state variants, which adds a Default, Hover, Pressed,
Focus, and Disabled variant and binds them; Add Off and On variants and
Add state variants turn a lone main component into a component set first,
and a part's slot can be added to a set, in every variant under one slot
id. Rows that could do nothing are gone: no empty pickers and no hints to
combine variants by hand, and an unbound Disabled is left to the states.
A warning line names what is still needed and replaces the missing chip,
and the Switch's main value is called Checked.
* fix: keep each slot to one part and keep creating slots at hand
A slot draws one part, so the Behaviour section no longer offers a slot
another part uses, and specs (the openpencil API, tools, and JSX) reject
binding one slot to two parts. A part's picker keeps an action to add a
new slot in its footer, so adding the first slot no longer hides it for
the other parts.
* feat: name the call and list every problem in validation errors
Tool arguments were checked with v.parse, whose error names only the first problem and neither the tool nor the argument, so a model that sent a wrong create_shape call read 'Expected string but received 42'. Tool arguments in Core, which AI chat, MCP, the CLI, and WebMCP all reach, the automation bridge's file commands, design JSX component properties, and gradient stops now throw a heading that names the call followed by v.summarize, which lists each issue with its path. parseToolArgs is exported for the app's own parses of tool arguments.
* test(design-jsx): pass a deliberately wrong property value through the types
The test checks what a script sees for a non-string instance property, which the Instance types reject at compile time.
* docs: say that MCP clients get the MCP SDK's validation report
The MCP SDK validates tool arguments against the registered schema before OpenPencil's handler runs, so an MCP client already received every problem with its path and does not see parseToolArgs' message.
* build: typecheck the test suites
Tests were in no TypeScript program: no tsconfig included tests/** or
packages/*/tests/**, and bun strips types without checking them, so a
fixture could drop a required field and keep passing until something
read it.
@types/bun moves to the root because it was installed per package only,
and #cli-tests/* joins the paths the root config already carries.
* test: fix the type errors the test suites were hiding
Typechecking the tests turned up 1123 errors. Most were ordinary
strictness, but some were real: `NodeChange` bound to Figma's plugin
typings rather than the Kiwi codec in thirteen .fig tests,
materializeInstance was called with six arguments against five so the
blobs and source children were dropped, CanvasKit pixels were written
to a plain object that never reached WASM, and assertions were made
through accessors that do not exist, so they asserted nothing.
Fixtures that had quietly lost a required field now carry it, nullable
results are narrowed through the existing expectDefined helper rather
than assumed, and stand-ins for CanvasKit and the editor go through one
named helper instead of an unexplained cast at each site.
No test was deleted, skipped, or weakened, and no `any`, non-null
assertion, or ts-expect-error was introduced.
* docs: record what typechecking the tests established
Pins the app program's global types with an assertion rather than a
note, since an unpinned types list lets any root @types package decide
which platform src/** is judged against.
The two environment faults that look like code regressions — Vite's
dependency pre-bundle outliving a package rebuild, and heavy .fig
suites failing under load — go to the development docs, where an
explanation belongs.
* fix: align @types/bun and keep node types resolvable when extended
The root manifest declared a newer @types/bun than every package, which
check:monorepo rejects, and pinning the app program's types left them
unresolvable from a config that extends this one out of tree.
* fix: fail the test typecheck when the compiler itself fails
The gate matched diagnostics by substring, so a compiler or config
failure that named no test file printed a pass while having checked
nothing. Diagnostics are now split by whether they name a file: an
unscoped one is the run failing and stops the gate, a test file's is a
finding, and a source file's stays out by design.
Also drops the parameter planComponentConstruction never read, and
makes the inner-shadow verification script exit non-zero when it
renders no image instead of logging and succeeding.
* chore: merge master into tests-typecheck
* feat(app): record runtime errors in diagnostics with their stack
Uncaught errors and unhandled rejections only showed a toast, Vue component errors after boot only reached the console, and a failed chat kept just its error name, so a failure like WebKit's 'Attempting to define property on object that is not extensible.' left nothing to diagnose. They now record a runtime.error, and chat.failed its code, message, and stack. Messages and stacks are scrubbed of URL queries, key- and token-like strings, and home folder names and bounded; AI SDK and provider errors keep no message, since it can quote prompts or responses. Copied diagnostics start with the app version, shell, browser, and language.
* feat(app): label, filter, and page diagnostics events
Every row in Settings → Diagnostics read 'Technical event': the summary looked labels up under diagnostics-prefixed keys the messages do not have, and only a few event kinds had labels at all. Each event now has a specific label and a short detail, such as 'Tool: render · 162 ms', 'Model step · <model>', or an error's message, expands to its recorded fields and stack, and the list filters by level and category and grows a page at a time. The copy action passes the environment header, which moves out of the recorder so tooling that compiles it needs no build-time globals.
* test(app): stream a reasoning reply in WebKit without page errors
Errors such as WebKit's "not extensible" TypeError appear only in that engine, so run a streamed reasoning reply there and fail on any page or console error.
* fix(app): scrub queries on bare paths in diagnostic errors
Only URLs had their query removed, so a message like 'Failed to load /Designs/app.fig?token=…' kept the token.
* fix(app): count diagnostics recorded before Settings opens
The event count and size updated only on new events, so the panel showed 0 events beside a full list.
* feat(app): record failed AI tool calls as problems, with the stack of engine errors
A tool catches what it throws and returns only the message to the model, so diagnostics saw a failed tool as an info event without details. The adapter now passes the thrown value to the tool log. A failed call is a warning; a TypeError, ReferenceError, or RangeError, which comes from a bug in OpenPencil rather than a wrong call, is an error with its message and stack. Other tool errors keep only their name, since their messages quote layer names and arguments.
* fix(core): log tool calls that return an error as failed
Most tools report a failure by returning { error } rather than throwing, such as describe with an unknown node, so the tool log and diagnostics counted them as successful calls while the chat showed them failed.
* feat(app): scrub cloud keys, JWTs, private keys, URL credentials, and emails from diagnostics
The scrubber caught keys by shape only, so 20-character AWS access key IDs, user:pass@ in URLs, and emails reached the log, and a JWT's payload survived because its dots split it into short runs. It moves into its own module with rules grouped by what they protect. The added credential formats follow gitleaks; keys the shape rules already catch, such as GitHub, OpenAI, Anthropic, and Stripe ones, get no separate rule. No maintained browser library fits: secretlint needs Node built-ins and adds at least 23 KB gzipped, and the PII redactors miss tokens. The scrubber is 0.8 KB gzipped.
* refactor(app): name how a tool call is recorded and import diagnostics from its index
* fix(app): record demo document loads in diagnostics
The preparation event's schema listed its kinds, phases, cancel reasons, and failure codes by hand and lacked demo-load, so every demo load failed validation and was dropped. The schema now validates against the same lists the preparation types derive from.
* feat(app): label document preparation events in Settings diagnostics
Preparation events showed their raw name, editor.preparation.finished, because the summary had no label for them. They now read as their kind, such as Switch page, with the outcome and duration below. Event names are a typed union and the labels a map keyed by it, so recording a new event without a label fails type-checking; names stored by older versions still fall back to the raw name.
* fix(app): keep source paths and scrub provider stacks, auth headers, and spaced home folders
Review follow-up. A provider error's message was dropped but repeated on its stack's first line, so it is now removed there too. The long-run rule redacted source paths of 40 or more characters, losing the failing file; a run with slashes now loses only its key-like segments. The bare-path query rule cut optional chaining such as a.b?.c and now needs name= after the question mark. Authorization header values in any scheme, credential assignments such as api_key= or password:, and home folder names with spaces are now scrubbed.
* fix(app): suppress repeats of alternating runtime errors
Repeat suppression compared each error only with the previous one, so a loop alternating between two errors recorded every occurrence. Recent errors are now kept in a small bounded map.
* test(app): validate copied diagnostics and wait for the copy to finish
Master now rejects JSON.parse with a type assertion, so the copied report is read through a Valibot schema. The uncaught-error test read the clipboard before its copy finished and could see the previous test's report; it now waits for the confirmation, as the export test does.
* feat: write variables as a CSS token stylesheet
Copy a collection as CSS custom properties or a Tailwind v4 theme from the variables dialog, print it with openpencil tokens, and rebuild design_to_tokens on the same generator. Default modes go in :root or @theme, other modes override under their condition, and aliases are declared again in each mode scope so they follow it.
* fix: give modes that slug alike their own selector and variant
Two modes in one collection whose names reduce to the same slug, such as Dark and dark!, shared one default selector and Tailwind variant, so the later mode silently overrode the earlier one. Slugs are now numbered in mode order, as variable names already are.
* fix: validate parsed JSON at untrusted boundaries with Valibot
Clipboard HTML, library revisions from shared storage, MCP and automation
WebSocket messages, the MCP discovery file, sidecar output and AI/MCP tool
arguments were JSON.parse'd and cast to their expected types, so a
malformed payload reached the document or crashed paste. They now go
through v.pipe(v.string(), v.parseJson(), Schema), which reports bad JSON
and a wrong shape as the same validation failure.
The path_set tool rejects an invalid VectorNetwork and shares its parser
with create_vector. The CLI library catalog validates its files and runs
revisions through the same size, identity and content-hash checks as the
app; reading image bytes as index-keyed records also stops them coming
back empty. Hand-rolled typeof readers for plugin data, document metadata,
caches and preferences become schemas with their behaviour preserved, and
readCacheJSON takes a schema for its payload.
open-pencil/no-unvalidated-json-parse rejects type assertions on
JSON.parse results other than `as unknown` in src and packages/*/src.
* refactor: validate parsed JSON in tests and tooling
Extend open-pencil/no-unvalidated-json-parse beyond source: tests, helpers and repo tooling now parse JSON through Valibot schemas instead of asserting a type. The shared fixture reader returns a validated object; its old array annotation never matched the fixtures.
* fix: validate clipboard geometry bytes, library images and model catalogs
Clipboard geometry blobs and library image bytes must be bytes at contiguous indexes, so out-of-range or gapped values are rejected instead of silently becoming different geometry or images; serialized library nodes must carry source metadata. The models.dev and OpenRouter responses are validated like their cached copies, and activate-tab rejects a CDP frame it cannot read instead of hanging.
* refactor: extend the JSON validation lint to .json() results
no-unvalidated-json-parse now also rejects type assertions on Response, Bun.file and shell .json() results, the same unchecked parse in another form. MCP server tests read /health through a validated readHealth helper and discovery files through parseDiscoveryInfo; the remaining tooling reads its JSON through schemas.
* test: validate the RPC request body in the CLI app export test
* test: validate CLI JSON output in the tool and app command tests
* test: compare the malformed models.dev fallback with the curated list
* feat: check designs live with a Check panel and canvas issue markers
Design lint only ran from the CLI and AI tools, and its rules were too noisy
to show continuously: on a real imported page 786 of 888 layers had a
warning. The rules now report where a finding is actionable (a hardcoded
color only when a variable matches it, nesting only where the limit is
crossed, instance sublayers through their main component) and carry
structured data, and Recommended keeps warnings for likely problems.
The app checks the current page after edits settle. The Check tab groups
issues by rule with hover highlighting, reveal on click, and one-step
variable binding. Errors and warnings are marked on the canvas with
clustered markers that roll up to visible ancestors when zoomed out; markers
explain themselves on hover, open Check on click, and toggle with
View > Design issues.
* fix: keep the right panel and markers stable
The Check tab made the right-panel tab row overflow at common window widths,
so focusing the zoom menu scrolled the row and shifted the panel. Code and
AI tabs now drop their labels to screen readers when the row is narrow.
Touch target names are matched as whole words: "Rectangle" contained "cta"
and marked every rectangle. Markers also stay drawn during interactive edits
instead of blinking while a value is scrubbed.
* fix(ui): show right panel tab labels whenever they fit
* fix(ui): name the design check tab Lint and keep panel tabs consistent
The tab was an unlabelled icon between labelled Code and AI tabs. It is now
Lint, with the same icon and label anatomy as its neighbours, and its icon
takes the severity color instead of a count badge. All labelled tabs show
their labels when the row fits and drop them together when it does not.
* refactor(ui): build the Lint panel from shared components
Issue groups use AppCollapsible, actions use AppButton, and the severity
filters are a Reka toggle group with keyboard navigation. Issue rows no
longer nest a button inside a button. Panel state, visibility and the
focused-issue scroll live in useDesignCheckPanel, the rules menu is its own
component, and rule preferences change through preference actions.
Severity ordering reuses Core's ranking, detail numbers follow the app
language, and the check debounce uses useTimeoutFn.
* fix(lint): check the WCAG AA touch target size in the Recommended preset
Recommended flagged a 394 × 39 input because it required the 44 × 44 AAA size. It now checks the 24 × 24 AA minimum through a minSize option; Strict and Accessibility keep 44 × 44.
* feat(lint): fix design issues from rules, the Lint panel, the CLI, and agents
Rules attach fixes as data: a safe fix keeps the design as it looks (bind a
color to the variable it matches, round subpixel geometry that layout does
not own), a suggestion changes values (snap radius and spacing to the
scale, raise small text to the minimum). One Core applier re-validates
each fix against the current graph and merges changes per layer.
The Lint panel offers a fix per row and Fix all for safe fixes as one undo
step; openpencil lint --fix writes the fixed document; the lint and
lint_fix tools expose the same to MCP and AI chat.
The design-check spec's Close button is now 24 x 20: at 24 x 24 it passes
the WCAG AA touch target size that Recommended checks.
* feat(lint): pin issues outside the view to the canvas edge
Errors and warnings on layers outside the viewport had no marker, so a
check could report issues nobody could see. They are now pinned to the
canvas edge where a ray from the viewport center toward them leaves it,
with a chevron pointing their way; pins in one direction merge like
markers. Hovering lists them under the direction they lie in, and
clicking reveals and opens the most severe, nearest one.
Pins keep clear of UI floating over the canvas: the toolbar marks itself
with data-canvas-obstacle, and canvases report such rectangles to the
renderer through getOverlayObstacles each frame.
* feat(lint): mark layers with design issues in the Layers panel
Like an IDE marks files with problems and the folders holding them, a
layer with errors or warnings shows the most severe as an icon, and a
collapsed layer with issues inside it shows a dot in that color.
Suggestions stay in the Lint panel, as on the canvas, and the marks
follow the View → Design issues toggle.
* feat(lint): show issues per page and across the document
Loaded pages beyond the current one are now checked in the background,
one page at a time while the editor is idle, and checked again only when
an edit touches them; pages a large .fig file has not loaded are left
alone until opened rather than forced in. The page list shows each page's
errors and warnings like an IDE's problem count, and the Lint panel gains
a Document scope that lists every page's issues, tags the ones on other
pages, and switches to a row's page when it is opened.
* test(lint): use the core-tests alias and no comma operator in lint tests
Master now rejects ../../ imports and the comma operator in tests.
* refactor(app): create the Lint session with the editor store modules
The composition root passed its line budget once master added recent
pages; the Lint session belongs with the other per-editor services that
the modules factory creates and disposes.
* docs(changelog): keep master's latest Unreleased entries
AI SDK 7 has no 'media' tool output part; images are { type: 'file', mediaType, data: { type: 'data', data } }. After diff_visual, export_image, or any other image result, the next step's prompt failed validation with AI_InvalidPromptError and the chat run stopped. toModelOutput is now typed against the SDK's ToolResultPart output, and a test validates the resulting tool message with the SDK's own schema.
* feat(core): add visual diff and patch apply tools
diff_visual renders two nodes at one scale through the existing raster export, compares them with pixelmatch, and returns the diff PNG with the changed ratio and region in source-node coordinates. It takes export_image's scale and maxEdge inputs. FigmaAPI gains a CanvasKit-backed raster codec and a pageId export option, so the app and headless CLI decode pixels and render nodes off the current page.
diff_apply applies diff_create and diff_show patches through the Figma API, validates every node before changing any, and supports dryRun and force. diff_show now simulates changes on a detached copy with the same property code. One serializer and parser back all three. diffDocuments compares two documents page by page by name path.
Image tool results now reach models as media with their metadata as text, for any tool rather than export_image alone. diff_create, diff_jsx, and diff_visual join the default AI tool set, and the diff tools are no longer hidden from WebMCP.
* feat(ai): show what each AI edit changed in its tool call
Reviewing an AI run meant reading tool output or undoing steps to see
what moved. Each document-changing call now rebuilds its page before
and after from snapshots taken around it, and diffs each top-level
layer's JSX with jsdiff, the same patch diff_jsx returns, to find the
layers it changed. After the call returns, the changed region renders
in both states at one size and pixelmatch highlights the difference.
The tool card opens on a Changes view with a before/after slider, the
pixel highlight, and a CodeMirror merge view of the JSX. Records are
saved with the conversation next to attachments.
Calls snapshot their page individually instead of through one shared
variable, so concurrent calls in a step no longer overwrite each
other's undo state. Core gains graphFromPageSnapshot for rebuilding a
past page state, diffPageLayersJSX and jsxPatch (now shared with
diff_jsx), renderRegionToImage for rendering two states of one region
pixel for pixel, and comparePNGs on the raster codec. Settings > Chat >
Change previews sets the stored image size or turns images off.
* feat(cli): add diff commands and agent diff guidance
openpencil diff create, jsx, show, apply, and visual run the Core diff tools on a file or the running app; apply writes back with --write or --output like eval. diff files compares two documents page by page and exits 1 when they differ.
The chat prompt asks the agent to edit in place and to verify risky edits against a reference copy with diff_jsx, diff_create, and diff_visual. The skill, CLI reference, MCP tool table, and a new Comparing Designs page document the commands and tools.
* feat(ai): render tool calls as summarized, highlighted cards
Every tool call showed only a status and its output as a JSON string,
so render calls hid their JSX, export_image dumped base64, and long
runs filled the transcript with identical rows.
A call now shows a one-line summary read from its input and chips that
select and zoom to the layers it touched, switching to the run's page
when needed. Expanded, it shows the JSX or script it wrote and its
JSON input and output in a read-only CodeMirror view, and exported
images inline. Render calls can be expanded while their input streams,
so the JSX appears alongside the canvas preview. Consecutive calls
beyond three fold into one row that keeps the latest call visible.
CodeMirror loads with the first expanded call. The code theme gains a
monospace fallback because the editor font variable is not always
emitted.
* feat(ai): let the chat AI diff its run against the starting state
The diff tools compare two nodes, so checking an edit meant cloning a
reference first, which the agent rarely did. diff_changes compares the
current page, or one node under it, with the page as it was before the
run first edited it, in diff_create's patch format. The app keeps that
page snapshot per run and exposes it through FigmaAPI.changeBaseline;
MCP and WebMCP have no run, so the tool is offered only to the AI chat,
where it is enabled by default and the prompt asks for it before
reporting.
* feat(core): diff and patch node trees as JSX attributes
diff_create, diff_show, diff_apply, and diffDocuments used a hand-rolled
`key: value` property format that covered about fifteen properties,
matched children by name path, and could not see moves.
Nodes are now projected to the attributes the JSX export prints, and
jsondiffpatch matches children (by ID or by name path) and detects
moves. Patches list `-`/`+` attribute lines per node plus moved, added,
and removed children. diff_apply checks every hunk first, applies
attribute changes through the renderer's prop handling, and changes only
the fields an attribute moves, so IDs, instance links, and other state
survive. diff_show takes JSX attributes instead of a JSON props object.
design-jsx gains sceneNodeAttributes, parseJSXAttributes, and
jsxNodeFields for this, and the export round-trip property table is
shared so every case is also diffed and applied. `diff files` loads its
documents in order so node IDs, and so its patches, are deterministic.
* feat(ai): report diff_changes as a patch diff_apply can replay
diff_changes printed a unified diff of the JSX, which agents could read
but not apply. It now diffs the run's baseline against the live page
with the patch engine, matching nodes by ID, so a rename is a changed
name and the output replays on the starting state with diff_apply. The
chat's Changes view keeps the JSX line diff, which is for people.
* fix(core): keep diff_apply atomic and diff files honest about differences
- Added nodes render before anything else changes; if one fails, for
example on a missing component, the rendered ones are deleted and
nothing else is committed.
- A hunk with an attribute the renderer ignores fails instead of
reporting "unchanged".
- diffDocuments reports `changed` from page statuses, and a page only
one document has gets its status but no patch, since patches do not
add or remove pages. diff files uses it, so an added empty page no
longer reads as a match.
- diff files rejects a --page neither document has and a --depth that
is not a non-negative integer, exiting 2; diff_create's depth is
validated the same way.
* refactor(ai): drop the unused tool JSON slot and place the JSX summary comment
* refactor(ai): find a tool change's clipping region with jsdiff
clipChangedJSX scanned both JSX sources character by character for their common start and end. diffLines gives the unchanged lines before the first change and after the last; the app now declares the diff dependency Core already uses.
* feat(core): add visual diff and patch apply tools
diff_visual renders two nodes at one scale through the existing raster export, compares them with pixelmatch, and returns the diff PNG with the changed ratio and region in source-node coordinates. It takes export_image's scale and maxEdge inputs. FigmaAPI gains a CanvasKit-backed raster codec and a pageId export option, so the app and headless CLI decode pixels and render nodes off the current page.
diff_apply applies diff_create and diff_show patches through the Figma API, validates every node before changing any, and supports dryRun and force. diff_show now simulates changes on a detached copy with the same property code. One serializer and parser back all three. diffDocuments compares two documents page by page by name path.
Image tool results now reach models as media with their metadata as text, for any tool rather than export_image alone. diff_create, diff_jsx, and diff_visual join the default AI tool set, and the diff tools are no longer hidden from WebMCP.
* feat(cli): add diff commands and agent diff guidance
openpencil diff create, jsx, show, apply, and visual run the Core diff tools on a file or the running app; apply writes back with --write or --output like eval. diff files compares two documents page by page and exits 1 when they differ.
The chat prompt asks the agent to edit in place and to verify risky edits against a reference copy with diff_jsx, diff_create, and diff_visual. The skill, CLI reference, MCP tool table, and a new Comparing Designs page document the commands and tools.
* feat(core): diff and patch node trees as JSX attributes
diff_create, diff_show, diff_apply, and diffDocuments used a hand-rolled
`key: value` property format that covered about fifteen properties,
matched children by name path, and could not see moves.
Nodes are now projected to the attributes the JSX export prints, and
jsondiffpatch matches children (by ID or by name path) and detects
moves. Patches list `-`/`+` attribute lines per node plus moved, added,
and removed children. diff_apply checks every hunk first, applies
attribute changes through the renderer's prop handling, and changes only
the fields an attribute moves, so IDs, instance links, and other state
survive. diff_show takes JSX attributes instead of a JSON props object.
design-jsx gains sceneNodeAttributes, parseJSXAttributes, and
jsxNodeFields for this, and the export round-trip property table is
shared so every case is also diffed and applied. `diff files` loads its
documents in order so node IDs, and so its patches, are deterministic.
* fix(core): keep diff_apply atomic and diff files honest about differences
- Added nodes render before anything else changes; if one fails, for
example on a missing component, the rendered ones are deleted and
nothing else is committed.
- A hunk with an attribute the renderer ignores fails instead of
reporting "unchanged".
- diffDocuments reports `changed` from page statuses, and a page only
one document has gets its status but no patch, since patches do not
add or remove pages. diff files uses it, so an added empty page no
longer reads as a match.
- diff files rejects a --page neither document has and a --depth that
is not a non-negative integer, exiting 2; diff_create's depth is
validated the same way.
Danila Poyarkov