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Compose Preview Catalogs

io.github.yschimke/compose-preview · v3.147.0

Measured by MCP Station

Instruction-like text was found in ui_builder_guidelines_prompt. This is a pattern match, not a verdict. What we look for

Description written by the publisher, not verified

Browse, inspect and render Jetpack Compose Material 3 and Wear component catalogs.

Connect

claude mcp add --transport http compose-preview https://preview.coo.ee/mcp

{
  "mcpServers": {
    "compose-preview": {
      "url": "https://preview.coo.ee/mcp"
    }
  }
}

Tools as reported by the server

• request_access
  Ask a human for access to this server. Returns an approveUrl and a userCode: show BOTH to the person you are working with, ask them to open the link and check that the code on the page matches, then call poll_access. When the client supports URL elicitation, call poll_access with urlMode=true instea
• poll_access
  Collect the outcome of a request_access, proving possession of its deviceSecret. It HOLDS THE CALL OPEN and answers the moment the human decides — one call instead of a dozen, since each poll here costs a whole round trip through you. It waits 8 seconds by default; pass waitSeconds (up to 30) if you
• status
  Report readiness, the aggregate catalog set, and which host this is: `origin`, the canonical origin designs here are homed at, and `originAliases`, other hostnames that reach this same server.
• catalog_list_projects
  List every remote catalog with its stable id and preview count. Call this first: catalog_list_previews and catalog_list_data_products take one of these ids as 'catalog'.
• catalog_library
  Open the hosted preview catalog browser app. With no arguments it lists every catalog with its preview count only; pass projectId to list one catalog's previews. To find previews without the app, call catalog_list_projects, then catalog_list_previews with a catalog id. Also opens from the ChatGPT/Co
• ui_builder_open
  Open the UI Builder's design list: pick a design to see it as the editor draws it. Takes no arguments. Also opens from the ChatGPT/Codex sidebar, and a deep link to /design/<id> opens one design.
• catalog_list_previews
  List the Compose previews and published metadata of one hosted catalog. 'catalog' is required (ids from catalog_list_projects). Pass 'query' (a component name such as EdgeButton) to narrow by id or label; results are paged (100 by default, 'offset'/'limit' for more). This server holds published libr
• catalog_render_preview
  Render one preview. Like local compose-ai-tools, the default semantics observation is token-frugal; request observe=png for pixels, observe=svg for the compose/figma-svg vector export as SVG source, or observe=scroll-png / observe=scroll-svg for the full-page capture of a scrollable screen rather th
• catalog_render_matrix
  Render one preview across the cross-product of the given override axes in a single call, returning a hash/size observation per cell (observe=png adds the pixels). Prefer this over a catalog_render_preview per combination: the cells share one catalog lease and are reported together, so comparing axes
• catalog_list_devices
  List the `@Preview(device = ...)` ids this server's render lane recognises, with each one's dp size and density. The `device` override takes one of these ids; an unrecognised name renders the default frame rather than failing, so check here instead of guessing.
• catalog_diff_semantics
  Compare two previews' semantics by testTag: which tags are only in one side, which moved, and which changed occupancy count. Identity is the authored testTag, not a positional ref, so a tag that stops resolving is reported rather than silently retargeted at different pixels. Requires live grant scop
• catalog_history_list
  The render timeline for one preview: which versions of its rendered bytes exist, when each appeared, and whether the preview is unstable (re-renders differently on every publish) rather than genuinely changing. Where this server holds the timeline it is returned inline; where the catalog is publishe
• catalog_history_diff
  Compare two of a preview's recorded renders. Defaults to the two newest — did the last publish move this preview? A metadata comparison: the timeline's versions are already collapsed distinct renders, so whether the bytes changed is answered without fetching either image. Reports `unstable` so a dif
• catalog_history_read
  Fetch one historical render's pixels through this server, by `commit` or `blob` (a prefix is enough). Use when an agent cannot reach the delivery branch itself, or wants the bytes rather than the timeline.
• ui_builder_list_catalogs
  List the component catalogs a UI-builder design can pin to. Start here: a design's `catalogPin` must name a revision this server actually serves, and each catalog's `catalogPin` here is exactly that. By default a summary of what authoring needs, a few KB rather than the whole capability: per compone
• ui_builder_search_components
  Find catalog components by id, display name, Compose symbol, role or trait, e.g. `TextField`, `text field`, `OutlinedTextField`, `Button`, `Card`. Case, spaces, hyphens, underscores, slashes and camelCase are ignored, and the components the query names come first: an exact name, then a prefix, then
• ui_builder_list_designs
  List the UI-builder designs on this server, newest first, with the cursor to continue.
• ui_builder_get_design
  Read one design: its whole document — nodes, slots, properties, modifiers, state variables and catalog pin — plus the revision to quote as `baseRevision` when editing it. The catalog the design pins is left out unless `includeCatalog` is true: it is the same for every design on the pin, ui_builder_l
• ui_builder_preview_catalog_recovery
  Dry-run recovery of a design whose stored catalog pin no longer resolves. The server selects the exact currently served pin for the same catalog system and returns a CatalogUpgradePreviewV1 with changes, issues and the hashes required by a later `upgradeCatalog` mutation through ui_builder_apply. Th
• ui_builder_await_design
  Wait for somebody else to change a design and return what they changed, rather than asking again whether they have. Returns the moment a designer in the browser or another agent commits an edit, as the same update frame the browser's own live socket receives; returns a `timedOut` reply if nothing ha
• ui_builder_create_design
  Create a design, either from a whole `document` you supply or by copying an existing design named by `fromDesignId`. Copying is usually right: a document's `catalogPin` must match a catalog revision this server serves, and a copy carries one that does. A `document` whose `home` is an existing design
• ui_builder_apply
  Apply design mutations — insertNode, setProperty, deleteNode, moveNode and the rest of DesignMutationV1 — as one operation. `baseRevision` is the revision you read; the outcome reports conflicts or rejected edits. This is how an agent adds a scaffold, fills its slots and sets modifiers. Use `setStat
• ui_builder_move_design_home
  Move a design's canonical home between this server and a repository checkout. This changes real authoritative state: quote the exact `baseRevision` and current `sourceHome` from ui_builder_get_design, provide a stable `operationId`, and name the new `targetHome`. The old server record remains as a r
• ui_builder_replace_design_document
  Replace one stored design from a complete DesignDocumentV1 copy — the authoritative save-back and re-import operation. The document must name the same design and the same canonical home you read from ui_builder_get_design; `baseRevision` must still be current. The runtime validates the complete docu
• ui_builder_export
  Export a design. `compose` returns the Kotlin the generator writes, or — when the design holds something it cannot express — diagnostics naming each reason. This is the same gate the browser's code pane shows, so an agent and a designer get the same answer about the same design.
• ui_builder_validate
  Check a design without saving it: a whole `document`, a stored design by `designId`, or `operations` against a stored design exactly as ui_builder_apply would apply them. Runs the same checks the real call does — document shape, catalog pin, the catalog's own validation, the mutation reducer — and t
• ui_builder_put_asset
  Put a picture behind an `assetKey`, so an `asset/image` node naming that key draws it instead of a placeholder. Send the PNG, JPEG, GIF or WebP bytes base64-encoded in `imageBase64`; the server stores them by content digest and pins {mediaType, contentDigest, source: uploaded} into the design's `ass
• ui_builder_design_access
  Read who can open a design: its owner, and every actor it has been shared with, each with the role and the actions that grant carries. Only the owner may ask — this is the answer to "who else is in here" and to "what is the id I must name when sharing".
• ui_builder_share_design
  Share a design with somebody else, or take that sharing back. `actorId` is the other party's actor id as this server spells it — `github:<login>` for a signed-in person, `operator` for the token holder, `agent:<fingerprint>` for another agent's grant; ui_builder_design_access lists the ones a design
• ui_builder_get_links
  Read what a design is **for**: the `issue` it was drawn for, the `reference` frame in the design tool it reproduces, the `pr` that implemented it, the `thread` it is being discussed in, and the `previous` design it continues. Start a session on somebody else's design here — it is the brief, and it i
• ui_builder_set_links
  Say what a design is for. **Replaces the whole record**: send every link you want kept, and omit one to clear it — so read ui_builder_get_links first if you are adding to what is already there. `issue`, `reference`, `pr` and `thread` are absolute http or https URLs, at most 2 KB each; `previous` is
• ui_builder_rename_design
  Give a design a new title. The title is the one thing about a design nothing else could change: it is set at creation, shown in every listing and the editor, and not part of any mutation. Anybody who may write the design may rename it. The revision does not move — a title is not design content — so
• ui_builder_delete_design
  Delete a design: it moves to the trash with its history, access list, overlay and discussion, and is gone from every listing and tool until ui_builder_restore_design brings it back, which works until `restorableUntilEpochMillis` in the reply (a day). After that it is purged for good. Only the owner
• ui_builder_list_trash
  The designs in the trash that you could restore — ones you deleted, or ones you own — most recently deleted first, each with who deleted it and its `restorableUntilEpochMillis`. Use it to undo a ui_builder_delete_design you regret, or to check what a cleanup removed. Takes no arguments.
• ui_builder_restore_design
  Bring a deleted design back out of the trash exactly as it was: the same revision, history, access list, overlay and discussion. Allowed to whoever could have deleted it, until its `restorableUntilEpochMillis`; after that it is not found. The reply is the design's listing entry.
• ui_builder_list_comments
  Read the discussion on a design: every thread, where each is pinned — a markup stroke, a design node, or a point on the frame — whether it is resolved, and every reply under it. `sequence` rises on each change and is the cursor to quote to ui_builder_await_comments. Comments are kept beside the desi
• ui_builder_post_comment
  Say something on a design — a reply into `threadId`, or a new thread when it is omitted. Pin a new thread with `markId` (a stroke on the reference overlay), `nodeId` (a node in the design), or `x`/`y` in frame fractions, so the person reading it can see what you meant. The comment is attributed to y
• ui_builder_resolve_comment_thread
  Close a comment thread once it is answered, or reopen one by passing `resolved: false`. The resolution is attributed to you and is reversible.
• ui_builder_acknowledge_comment
  Say that you have read a comment thread — which is **not** the same as resolving it. Resolving claims the question is settled; acknowledging claims only that you have seen it, which is the honest thing to say while you are still working on what it asked for. Omit `threadId` to acknowledge the whole
• ui_builder_react_to_comment
  React to one comment with an emoji, or take the reaction back with `on: false`. The lightest thing you can say: 👀 on a comment you have just picked up, 👍 on a fix somebody made, where a reply would be noise in a thread a person has to read. `commentId` is the `id` of a comment inside a thread, from
• ui_builder_await_comments
  Wait for the discussion to move past `afterSequence` and return it, rather than polling for it. Returns as soon as anybody — a designer in the browser or another agent — posts, resolves or deletes; returns a `timedOut` reply if nothing happens within `waitSeconds`, which you answer by calling again
• ui_builder_render_native
  Compile a design and render it with real Compose on this host, rather than in the browser's Wasm canvas — the way to see what a design looks like on Android. Returns the first frame, the token the live frame stream is opened with, and the design node ids the render is tagged with, so `catalog_get_pr
• ui_builder_view
  See a design the way a person in the editor sees it: a PNG of the canvas with the overlays drawn on — the `selection` outline, the `reference` picture when one is attached, the discussion's `comments` pins, and the layout `bounds` — and beside it JSON with the revision, each visible node's id and bo
• ui_builder_check_design
  Check a design before you show it to anybody — one call instead of validate, view and an accessibility pass. Runs `schema` (document shape), `catalog` (the pinned catalog's validation, the mutation reducer and the Compose export gate — what ui_builder_validate runs) and `a11y`: controls with no labe
• ui_builder_guidelines_prompt
  Read the exact prompt a design-guidelines model is given for a design, before anybody spends a key on it: the rules for the design's platform (Android design guidance from developer.android.com, each with its source), the fixed system prompt, the user message with the design tree and Compose source,
• ui_builder_get_guidelines
  Read a design's latest design-guidelines result, whoever ran it — a person in the editor on their own key, ui_builder_check_design on this host's key, or an agent that recorded verdicts with ui_builder_record_guidelines. Returns the record (model, revision, rules asked, verdicts, `ranBy`), the findi
• ui_builder_record_guidelines
  Record your own model's verdicts on ui_builder_guidelines_prompt as the design's latest design-guidelines result, so the editor's Issues panel and other agents show them. Pass the `revision` and rule ids the prompt asked (`rules.asked[].id`), and one verdict per rule you answered: `pass`, `fail` or
• ui_builder_render_design_matrix
  See one design on several devices in ONE picture: a contact sheet with a captioned cell per device × theme × font scale, plus each cell's device, size and box on the sheet. Nothing is saved — the design's environment is swapped on a scratch copy for each cell. Name `devices` by preset (phone_small,
• ui_builder_record_decision
  Record a review verdict — `approve` or `reject` — on one revision of a design, with an optional note. Kept beside the design, like comments: it never moves the revision. Recorded as an agent's decision, so a person waiting with ui_builder_await_decision's default `from: "human"` is not answered by i
• ui_builder_await_decision
  Wait for somebody to approve or reject a design, rather than asking again whether they have. Returns as soon as a decision lands after `afterSequence` — by default only a person's (`from: "human"`), on any revision unless you name one — or a `timedOut` reply after `waitSeconds`. Every reply carries
• ui_builder_set_implementation
  Record the pull request that implements a design: its URL, its `status` (draft, open, merged, closed), the design `revision` it implements, and — once you have compared the PR's rendered previews with the design — `previewMatch` {status: match|mismatch|unknown, evidence: a URL to the comparison, not
• ui_builder_implementation_status
  Everything the code side needs to implement a design, in one call: the revision, its links (issue, reference, PR, thread), the implementation PR with its status and whether its previews were found to match, the latest verdict on this revision, and the Compose export with the generator's diagnostics.
• ui_builder_find_design_for_pr
  From a pull request back to the design(s) it implements: every design you can read whose implementation record or links name `pr`, with the implementation status and revision. Then call ui_builder_implementation_status for what the design expects.
• ui_builder_set_reference
  Attach the picture a design is being built against — a Figma frame, a screenshot of a shipped screen, a mock — as its reference overlay, or `clear` it. The same overlay the browser editor's Frame, density and reference panel shows, so a person opening the design sees what you attached. Kept beside t
• ui_builder_compare_reference
  Measure a design against its reference overlay (attach one with ui_builder_set_reference). Returns what the picture is against the frame and whether a pixel comparison means anything (`facts.pixelComparable` — a 328×56 dp crop stretched over a screen is not comparable until measured at its `actual`
• ui_builder_list_revisions
  A design's retained revisions, newest first: each one's number, who made it, when, the operation that produced it (`setProperty ×2, insertNode`, `undo`, `restored r3`) and its document digest. `retention` says how far back the history still reaches — older revisions are gone, and get, diff, restore
• ui_builder_diff_designs
  Compare two designs, or two retained revisions of one: nodes added, removed and moved, and properties, modifiers and other fields changed, each with its node id and path (`root/slot[index]/node`), plus changed document fields (title, environment, state). Works across a design and its fork. `b` defau
• ui_builder_restore_revision
  Make a retained revision the design's current content again, **forward**: it is committed as a new revision and nothing after it is lost, so a restore is undone by restoring again. `baseRevision` must be the current revision (a restore that raced an edit is refused as stale). `dryRun: true` writes n
• ui_builder_fork_design
  Make a new design from one revision of another — yours to edit, owned by you, with its parent recorded: the fork's `forkedFrom` (design, revision, document digest) and the parent's `forks` both show in ui_builder_get_links. A fork is not a branch: it never inherits the parent's canonical home and no
• ui_builder_branch_design
  Fork a design at a revision into a **branch** to explore an alternative, or to change it without trampling somebody editing it live. A branch is a design with its own id: edit it with ui_builder_apply, look at it with ui_builder_view or ui_builder_get_design, compare it with ui_builder_diff_designs,
• ui_builder_list_branches
  A design's branches, newest first: each one's id, name, owner, status (open, merged, archived), fork revision, head revision and the number of commands a merge would replay; for a merged one the parent revision it landed at, for an archived sibling the branch whose merge superseded it. Read access t
• ui_builder_merge_branch
  Replay a branch's edits onto its parent's current revision through the same reducer every edit goes through — all or nothing. The reply reports every command: `applied` with the revision it landed at and any `STALE_*` notice of what it overwrote, or `refused` with the rejection code that stopped the
• ui_builder_archive_branch
  Close a branch without merging it: it stays readable and listed, and can no longer be edited or merged. Needs write access to the parent, or to have made the branch.
• ui_builder_compare_branches
  Put a design's alternatives side by side in one call: the parent's head and each open branch (or the `branchIds` named) rendered into ONE picture — a short-lived signed https link, numbered by caption — plus, per branch, what it changes against the parent at its fork (counts and a few lines, as ui_b
• ui_builder_pick_branch
  Ask the person which alternative (open branch) of a design to keep, and return their choice. In ChatGPT or Codex it is a thumbnail picker, one option per branch; with plain form elicitation it is a single-choice form; otherwise — and in chat tools like Slack — it returns a numbered list and one pict
• catalog_list_data_products
  List the structured data-product kinds of one catalog, optionally one preview. Name the catalog with 'catalog' (ids from catalog_list_projects) or a preview 'uri'.
• catalog_get_preview_data
  Fetch the merged accessibility or annotation product for a preview. This lane requires live grant scope.
• list-all-documentation
  Storybook-MCP-compatible alias that lists every preview as a story.
• get-documentation-for-story
  Storybook-MCP-compatible preview metadata lookup.
• preview-stories
  Storybook-MCP-compatible rendering of one or more story ids. Requires live scope.

Repository · JSON · Text for agents · Registry updated 2026-10-22