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feat(canvas): admin UI for agent-authored markdown canvases with live updates (#300)
* feat(canvas): D.1 — author shortcode spike HTML Self-contained spike at spellbook/admin/frontend/spike/canvas-shortcode-spike.html implementing the design §12.3 harness: react-markdown@9 + remark-gfm@4 + rehype-raw@7 pulled via importmap from esm.sh. Defines Chart, Tabs, Tab shortcode components and a fixed markdown sample exercising: 1. <chart caption="multiline spec"> with multiline Vega-Lite JSON inside <tab title="Alpha"> inside <tabs>. 2. <chart> inside a GFM table cell. Verdict capture (D.2) and grammar lock (D.5) follow. * test(canvas): D.2 — spike verdict captured: PASS Ran the Phase 2 shortcode spike via Node 25.9.0 + react-dom/server.renderToStaticMarkup, exercising the same react-markdown@9.1.0 + remark-gfm@4.0.1 + rehype-raw@7.0.0 pipeline as the browser-side spike harness. All three design §12.5 criteria PASS: - <tabs> preserves <tab> children container semantics (no flattening) - multiline Vega-Lite JSON survives inside <chart> children verbatim - <chart> in a GFM table cell renders as case (a) without breaking the table Verdict: §9 grammar LOCKED as designed (children-content + attribute-content hybrid). Tracks A, B, C are unblocked pending the §9 annotation in D.5. * chore(canvas): D.4 — move spike to docs/spellbook-canvas-shortcode-spike/ Promotes the Phase 2 shortcode spike from the transient spellbook/admin/frontend/spike/ harness into a permanent reproducer under docs/spellbook-canvas-shortcode-spike/. Adds a README explaining how to re-run the spike from the browser (python3 -m http.server) and how to interpret the three pass/fail criteria from design §12.5. This keeps the spike artifact alive past Phase 3 freeze so future react-markdown / rehype-raw upgrades can be validated against the known-good baseline (per design §12.2). The spellbook/admin/frontend/spike/ directory is removed. * docs(canvas): D.5 — lock §9 shortcode grammar Phase 2 shortcode spike (Track D) verdict: PASS on all three §12.5 criteria. The §9 grammar — children-content for multiline JSON/DSL plus attribute-content for short props — is locked as designed. This commit adds an in-repo, version-controlled snapshot of the GRAMMAR LOCKED annotation that was applied to the (out-of-tree) design doc at: /Users/eek/.local/spellbook/docs/Users-eek-Development-spellbook/plans/2026-05-14-spellbook-canvas-design.md §9 Tracks A (Backend), B (Frontend), and C (Skill/Slash command) are UNBLOCKED. They may proceed against the §9.2 dispatch table as originally written; no fallback grammar pivot is needed. Reproducer: docs/spellbook-canvas-shortcode-spike/canvas-shortcode-spike.html Verdict transcript: docs/spellbook-canvas-shortcode-spike/spike-result.md * feat(canvas): A.1 — filesystem store with atomic writes Implements spellbook/canvas/store.py with CanvasMeta pydantic model, NAME_RE single-source regex, _max_page_bytes() env-read-at-call-time, atomic _atomic_write helper (tempfile + os.replace mirror of agent2agent precedent), path-traversal guard mirroring spellbook/admin/routes/memory.py, and the open/read/list/close/write surface required by A.3 and A.4. Test fixtures live in tests/canvas/conftest.py: canvas_tmp_root, mock_ctx, and event_subscriber (per design 14.2). The event_subscriber fixture monkeypatches event_bus.publish rather than subscribing through the bus, to avoid pytest-asyncio loop-affinity races on the per-subscriber asyncio.Queue. 44 tests pass; coverage on spellbook/canvas/store.py is 92% (target >=90). Threat-model paragraph appears in both __init__.py and store.py module docstrings (TRUSTED-LOCAL-AGENT). * chore(canvas): A.2 — add CANVAS subsystem to event bus Appends Subsystem.CANVAS = "canvas" to spellbook/admin/events.py so the canvas MCP tools (A.3) can publish canvas.opened / canvas.updated / canvas.closed events through the existing event_bus singleton. The frontend WebSocketContext dispatch (Track B) will key off this value. Test: tests/admin/test_events.py::test_canvas_subsystem_exists. Existing 13 event-bus tests remain green. * feat(canvas): A.3 — MCP tools (canvas_open/write/close/list) Adds spellbook/mcp/tools/canvas.py with four async @mcp.tool() functions following the memory.py precedent (decorator stack: @mcp.tool + @inject_recovery_context, dict returns, no raised exceptions for expected failures). Key design decisions baked into this implementation: - Event publishing uses await event_bus.publish wrapped in try/except logging WARN with exc_info=True (diverges from memory.py's silent except, per design 6.3 observability requirement). - URL construction reads HOST/PORT via spellbook.core.config.get_env so the canvas URL respects operator env overrides (mirrors spellbook/admin/cli.py and spellbook/mcp/server.py precedent). - canvas_store.NAME_RE is the single source of truth for name regex, used at the route boundary too (A.4). - Error catalog matches design 13: invalid_name, not_found, closed, page_too_large, invalid_content. queue_overflow stays reserved. Threat-model paragraphs from design 4.1 lines 196-200 and 4.2 lines 278-281 appear verbatim in canvas_open and canvas_write docstrings respectively (TRUSTED-LOCAL-AGENT, rehype-raw, session-takeover wording intact). Two regression tests assert the docstring content stays in place. 19 tests pass in tests/mcp/tools/test_canvas.py (the plan asked for 14 behavior tests + the threat-model and publish-failure resilience cases were added on top to lock in the security and observability contracts). Coverage on the new module exceeds 80% by inspection; pytest --cov with the dotted module path triggers a pre-existing beartype/fastmcp circular-import warning in this environment unrelated to the new code (the same warning fires against spellbook.mcp.tools.memory). * feat(canvas): A.4 — admin API routes for canvas listing and detail Adds spellbook/admin/routes/canvas.py with two read-only endpoints: - GET /api/canvas - sorted list, count, paginated client-side - GET /api/canvas/{name} - single canvas detail with markdown content Both routes share the existing require_admin_auth HMAC-cookie dep -- no new auth surface. Pydantic response models (CanvasListItem, CanvasListResponse, CanvasDetailResponse, CanvasErrorResponse) match design 5.1 verbatim. Per impl plan P2-8, the {name} route uses canvas_store.NAME_RE.match rather than re-declaring the pattern -- single source of truth so 3.3 changes propagate without route drift. Error envelope matches 13: invalid_name -> 400, not_found -> 404. Wired into spellbook/admin/app.py adjacent to the memory_routes include. 7 tests pass in tests/admin/routes/test_canvas.py covering: unauth list, unauth detail, empty list, populated sorted list, happy detail, invalid name, not found. * test(canvas): A.5 — end-to-end integration test Adds tests/integration/test_canvas_e2e.py exercising the full canvas loop end-to-end: canvas_open (MCP) -> canvas_write (MCP) -> event_bus.publish (canvas.opened, canvas.updated captured) -> GET /api/canvas/{name} returns the written content Conftest discovery decision (documented per impl plan A.5 step 1): the admin client + token mock fixtures live in tests/admin/conftest.py but pytest's sibling-conftest discovery does NOT auto-load them into tests/integration/. Rather than create a duplicate tests/integration/conftest.py, the e2e module assembles its own authed TestClient inline. This keeps tests/integration self- contained, with no implicit dependency on tests/admin/. The canvas_tmp_root, mock_ctx, event_subscriber fixtures from tests/canvas/conftest.py ARE imported explicitly (noqa: F401) since those are the canonical shared-fixture pattern per design 14.2. Two tests pass: the headline write -> event -> route round-trip plus a list+detail variant that confirms canvas_open visibility through GET /api/canvas as well. * docs(canvas): C.1 — add canvas skill (skills/canvas/SKILL.md) * docs(canvas): C.2 — add /canvas slash command * chore(canvas): B.1 — install frontend dependencies for canvas rendering Add react-markdown@9, remark-gfm@4, rehype-raw@7, mermaid@11, react-vega@8, vega-lite@6. Required for the §9 shortcode rendering pipeline (B.4-B.7). Side fixes (pre-existing broken build on the shipping branch): - tsconfig.json: add "ignoreDeprecations": "6.0" — typescript@^6.0.3 was failing tsc with TS5101 on the legacy baseUrl option. - src/vite-env.d.ts: add /// <reference types="vite/client" /> — main.tsx side-effect import of './styles/globals.css' was failing TS2882 without the vite/client ambient types. Install notes (operator heads-up): - User's global ~/.npmrc points at an expired StyleSeat CodeArtifact registry; install used --registry=https://registry.npmjs.org/ to bypass. - Pre-existing eslint peer-dep mismatch (eslint-plugin-react-hooks@7 vs eslint@10) required --legacy-peer-deps. Not a new conflict. * feat(canvas): B.2 — types and TanStack Query hooks for canvas Add `CanvasListItem`, `CanvasListResponse`, `CanvasDetail`, and `CanvasErrorResponse` to `api/types.ts` matching the Pydantic shapes returned by `spellbook/admin/routes/canvas.py` (design §5.1). Add `hooks/useCanvases.ts` exporting `useCanvasList()` and `useCanvas(name)`. Hooks key on `['canvas']` and `['canvas', name]` so the WebSocket layer (B.3) can invalidate them on `canvas.*` events. * feat(canvas): B.3 — WS canvas dispatch + dashboard invalidation Add `case 'canvas':` to the WebSocketContext subsystem switch. On every `CANVAS` event from the bus, invalidate three TanStack Query keys: - `['canvas']` (refresh CanvasList) - `['canvas', name]` (refresh the open CanvasDetail, when payload carries the canvas name) - `['dashboard']` (refresh top-line counts, matching every other case in this switch — see lines 34-58) The triple-invalidation is per impl plan P2-4: without `['dashboard']`, the home page counters drift when a canvas is opened/closed/written. * feat(canvas): B.4 — simple shortcodes (Callout, Tabs, Choice, Approve) Implement the four non-lazy shortcode components per §9.2 / §9.5: - `Callout` — `<aside>` with type-driven left-border color (note/tip/ warning/danger) and optional title. Markdown children pass through. - `Tabs` + `Tab` — tabbed-panel container. `Tabs` iterates `Children`, selects every `Tab` child, renders a tab bar plus the active tab's body via `useState`. Both exports live in `Tabs.tsx`. - `Choice` — v2-reserved disabled preview. Parses `options` as JSON; on parse failure renders an empty radiogroup. "Reserved for v2" badge. - `Approve` — v2-reserved disabled preview with two disabled buttons and a "Reserved for v2" badge. All four carry `data-testid` attributes used by B.7's `render.test.tsx`. No tests in this commit — render dispatch is covered by B.7. * feat(canvas): B.5 — Diagram shortcode with lazy Mermaid + ErrorBoundary - `extractText.ts`: shared helper that walks `react-markdown` children and concatenates string content. Mirrors the validated helper from the §12 spike (children-content grammar, locked 2026-05-14). - `MermaidImpl.tsx`: default-exported component that initializes `mermaid` once, calls `mermaid.render(uniqueId, source)`, and injects the resulting SVG via `dangerouslySetInnerHTML`. Render errors render inline. Initialized with `securityLevel: 'strict'` and `theme: 'dark'`. - `Diagram.tsx`: wraps `MermaidImpl` in `Suspense` + `ErrorBoundary`, loads it via `lazy(() => import('./MermaidImpl'))` so `mermaid` (~700 KB minified) lives in its own Vite chunk and stays out of the initial admin bundle. Per-shortcode error isolation per §8.3. Diagram is not yet wired into `CanvasRender` — that lands in B.7, where the lazy-split is observable in the build output. * feat(canvas): B.6 — Chart shortcode with lazy react-vega + ErrorBoundary - `ChartImpl.tsx`: default-exported component using `react-vega`'s `VegaLite` (actions=false). Receives an already-parsed spec object. - `Chart.tsx`: wraps `ChartImpl` in `Suspense` + `ErrorBoundary` and loads it via `lazy(() => import('./ChartImpl'))`. JSON parsing happens in `Chart` so empty/invalid specs render an inline error (`<pre>`) before the lazy chunk is fetched. Per-shortcode error isolation (§8.3) is intact: - JSON parse error → inline `<pre>` with parser message - Vega render error → caught by `ErrorBoundary` Side fix to B.1's install: re-pin to the impl plan versions (react-vega@^7, vega-lite@^5) and add `vega@^6` + `vega-embed@^6` as explicit deps to satisfy react-vega@7's peer requirement. react-vega@8 (npm latest) drops the `VegaLite` named export and requires a different hook-based API; sticking to the plan's pinned majors avoids drift. Chart is wired into `CanvasRender` in B.7; the code-split is observable in the build output then. * feat(canvas): B.7 — CanvasRender dispatch pipeline + tests (8 PASS) - `canvas/render.tsx`: `CanvasRender({ content })` wraps `ReactMarkdown` with `remarkPlugins=[remarkGfm]`, `rehypePlugins=[rehypeRaw]`, and a components-prop dispatch map covering all seven locked §9 shortcodes: chart, diagram, callout, tabs, tab, choice, approve. - `canvas/__tests__/render.test.tsx`: 8 vitest cases (TDD, fail-then- pass). Lazy `MermaidImpl` / `ChartImpl` are mocked via `vi.mock` so the dispatch table can be verified without evaluating the heavy chunks. Coverage matches impl plan acceptance: 1. plain markdown heading 2. <callout type="warning"> 3. <tabs>+<tab> (active panel rendered) 4. <tab> standalone (named export) 5. <choice> v2-disabled preview 6. <approve> v2-disabled preview 7. <diagram> → lazy MermaidImpl (Suspense resolves to mock) 8. <chart> → lazy ChartImpl (JSON spec parsed in Chart) Trust boundary doc: comment in render.tsx restates §10 trusted-local- agent (rehype-raw executes raw <script>; do not pass unsanitized external content into a canvas). * feat(canvas): B.8 — CanvasList and CanvasDetail pages - `CanvasList.tsx`: list page mirroring `MemoryBrowser` per OQ-1. Renders a table (name link, title, last_updated, status badge), an empty state ("No canvases yet…"), and a retry-on-error block. Backed by `useCanvasList()`. - `CanvasDetail.tsx`: detail page bound to `/canvas/:name`. Backed by `useCanvas(name)`. Renders four states: loading (LoadingSpinner), not-found / error ("Canvas not found" + back link), closed banner above content, and the happy path (title + metadata + CanvasRender). - `__tests__/CanvasList.test.tsx`: 5 vitest cases (mocks `useCanvasList`): populated rows with /canvas/<name> links; closed badge; empty state; loading state; error + retry button. - `__tests__/CanvasDetail.test.tsx`: 5 vitest cases (mocks `useCanvas`, plus the lazy chunks `MermaidImpl` / `ChartImpl`): loading; 404 with back link; closed banner; CanvasRender markdown heading; CanvasRender shortcode dispatch (callout). * feat(canvas): B.9 — register canvas routes and sidebar nav link - `App.tsx`: register `<Route path="/canvas">` → `CanvasList` and `<Route path="/canvas/:name">` → `CanvasDetail`. Both wrapped in the existing top-level `<ErrorBoundary>`. Router basename is `/admin`, so real URLs are `/admin/canvas` and `/admin/canvas/<name>`. - `Sidebar.tsx`: append `{ to: '/canvas', label: '// CANVAS' }` to `navItems` between `/memory` and `/security` (per OQ-1, mirroring MemoryBrowser's adjacency). - `Sidebar.test.tsx`: add two assertions — a /canvas href check and an ordering check confirming `// CANVAS` sits between `// MEMORY` and `// SECURITY`. - `spellbook/admin/static/*`: rebuilt static assets. Vite emits `MermaidImpl-*.js` and `ChartImpl-*.js` as separate chunks plus ~30 mermaid-internal sub-chunks (sequence/flow/c4/gantt/etc.). Verified: `mermaid` and `vega` strings do NOT appear in `index-*.js`, only in `MermaidImpl-*.js` / `ChartImpl-*.js`. Full frontend test suite: 267/267 passing. * test(canvas): fix CanvasList green mirage — exercise real useCanvasList * test(canvas): fix CanvasDetail green mirage — exercise real useCanvas * test(canvas): add WS canvas dispatch coverage (B.3 mirage fix) * test(canvas): use globalThis instead of global for tsc strict mode * fix(canvas): build canvas root with os.path.join for native separators `_resolve_canvas_root()` returned `os.path.expanduser("~/.local/spellbook/canvas")`, which on Windows produces a mixed-separator path (`C:\Users\X/.local/spellbook/canvas`). The OS accepts it, but downstream string-suffix / `os.sep`-based checks break on the inconsistent separators — including `test_default_canvas_root_is_under_home`, which was the sole failure on `python-tests (windows-latest)`. Construct the path with `os.path.join(os.path.expanduser("~"), ".local", "spellbook", "canvas")` so every component uses the platform-native separator. The path-traversal guard in `_canvas_dir` already uses `os.path.realpath` + `os.sep`, so consistent separators make that check robust on Windows too. * test(canvas): deterministic timestamps + CHANGELOG entry for canvas Addresses two Momus review findings on PR #300. BOT-A2 (Medium): Add a CHANGELOG.md `[Unreleased]` entry describing the canvas feature (MCP tools, filesystem store, admin routes, event-bus subsystem, React UI, live updates, threat model, MVP scope). BOT-A3 (Low): Replace `time.sleep(0.01)` calls in `test_list_canvases_sorted_by_last_updated_desc` with explicit `datetime`-based timestamps. The previous version relied on wall-clock spacing between `open_canvas` calls separating `last_updated` timestamps by at least one millisecond; on slow CI runners this was a flake risk. Now both canvases' `last_updated` is written explicitly via `write_meta`, with a one-second gap, so the assertion is timing-independent. * chore(ci): retrigger workflows for prior commit (no diff) * fix(canvas): tolerate malformed SPELLBOOK_CANVAS_MAX_PAGE_BYTES Addresses BOT-B1 (Low) from the Momus review of PR #300. `_max_page_bytes()` called `int(os.environ.get(...))` directly, so a non-integer or non-positive value would propagate as an opaque `ValueError` through every `canvas_write` call. A single typo in operator config would break the entire feature. Behavior change: a malformed env var is now logged at WARNING and the function falls back to the 1 MB default. Three unit tests cover the non-integer, non-positive, and unset paths. * fix(canvas): doc/test mock accuracy + Tabs identification dead code Addresses BOT-C1, BOT-C2, BOT-C3 from the Momus review of PR #300. All three are non-blocking (verdict was APPROVE) but cheap to fix. BOT-C1 (Low) — `CanvasDetail.test.tsx`: mock data used `page: 'page.md'`, but MVP only emits `page: 'index.md'` (per `_max_pages` / `pages/index.md` contract). Aligning the mock keeps the test exercising realistic data. BOT-C2 (Low) — `skills/canvas/SKILL.md` documented the bus event as `canvas.written` in two places, but the implementation emits `canvas.updated`. Both references updated; no other `canvas.written` references found in the tree. BOT-C3 (Nit) — `Tabs.tsx` had a redundant identity check: `el.type === Tab || (typeof el.type !== 'string' && el.type === Tab)`. The second clause is implied by the first, so collapse to a single `el.type !== Tab` guard and refresh the comment. * docs: add worktree-switching note to AGENTS.md Use install.py to switch active worktree; symlink shortcut alone misses per-platform MCP registrations and produces a stale /mcp panel. --------- Co-authored-by: elijahr <153711+elijahr@users.noreply.github.com>
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AGENTS.md

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When a pre-commit hook fails, it often generates or modifies files. Stage those files (`git add`) and commit again.
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## Switching Between Worktrees
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To switch which worktree the installed spellbook runs from, always run `uv run install.py` from the target worktree. Don't just re-point `~/.local/spellbook/source` — the symlink shortcut updates the daemon's code path but misses per-platform MCP registrations (`claude mcp add`, OpenCode, Codex, Forge), so `/mcp` ends up missing `spellbook` or showing a stale tool list. `install.py` is idempotent; run it.
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## Architecture Notes
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- The MCP server (`spellbook/`) runs as a persistent daemon, not inline with the CLI

CHANGELOG.md

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### Added
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- **Canvas — admin UI for agent-authored markdown pages with live updates.**
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A new `/admin/canvas` section displays Markdown pages an agent writes to
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`~/.local/spellbook/canvas/<name>/`, with diagrams (Mermaid) and charts
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(Vega-Lite) rendered inline via curated shortcodes, updated live over the
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existing admin WebSocket.
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- Four MCP tools (`canvas_open`, `canvas_write`, `canvas_close`,
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`canvas_list`) let any agent session open and update named canvases
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from a terminal. Errors return structured codes (`invalid_name`,
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`page_too_large`, `not_found`, `closed`).
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- Filesystem store with atomic writes (tempfile + `os.replace`), name
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validation, path-traversal guard, and configurable max page size
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(1 MB default via `SPELLBOOK_CANVAS_MAX_PAGE_BYTES`).
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- Admin REST routes behind `require_admin_auth`: `GET /api/canvas`
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(list) and `GET /api/canvas/{name}` (detail).
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- New `CANVAS` event-bus subsystem with `canvas.opened` /
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`canvas.updated` / `canvas.closed` events.
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- React `/admin/canvas` list and `/admin/canvas/<name>` detail pages,
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Markdown rendered via `react-markdown` + `remark-gfm` + `rehype-raw`,
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with six curated shortcodes (`<chart>`, `<diagram>`, `<callout>`,
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`<tabs>`/`<tab>`, `<choice>`, `<approve>`). Mermaid + Vega-Lite are
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lazy-loaded out of the initial bundle.
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- Live update: WebSocket `canvas` subsystem invalidates `['canvas']`,
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`['canvas', name]`, and `['dashboard']` query caches.
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- `/canvas` slash command + `skills/canvas/SKILL.md` for agent-facing
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guidance.
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- Threat model: trusted-local-agent only. `rehype-raw` is an explicit
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escape hatch; agents MUST NOT render unsanitized external content.
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The constraint is documented in the MCP tool docstrings, SKILL.md,
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and slash-command doc.
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- One-way only in MVP (agent writes, browser reads). Multi-page
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canvases, two-way inbox / form submission, page history, full-text
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search, and RJSF form rendering are reserved for v2.
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- **Develop skill Phase 4 guardrail hardening.** Bans phrases like "TDD mode"
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and "or read SKILL.md" that signal subagents to inline behavior instead of
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invoking the Skill tool; mandates a "Launching skill:" check in subagent

commands/canvas.md

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---
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description: Open, write to, list, or close a canvas — a live-updating presentation surface served at /admin/canvas/<name>.
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---
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# /canvas <subcommand> [args]
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`/canvas` is a thin slash-command shell over the canvas MCP tools. The
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heavy lifting — guidance on when to use a canvas, the shortcode grammar,
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and the threat model — lives in `skills/canvas/SKILL.md`. Read that skill
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when the operator asks you to put substantive content on a canvas.
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Subcommands:
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- `open <name>` — open or attach to a named canvas. Returns the URL.
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- `close <name>` — mark a canvas as closed (files are not deleted).
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- `list` — list all known canvases (open and closed).
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- `write` is intentionally NOT a slash command. Agents call `canvas_write`
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directly via MCP, passing the full markdown body each time.
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## Routing
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| Input | Action |
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|---|---|
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| `/canvas open <name>` | Invoke MCP tool `canvas_open(name=<name>)`. Surface the returned `url` to the operator. |
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| `/canvas close <name>` | Invoke MCP tool `canvas_close(name=<name>)`. |
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| `/canvas list` | Invoke MCP tool `canvas_list()` and render the result as a table. |
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If the user passes no subcommand or an unknown one, print this usage and
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exit. Do not guess at intent; ask the operator which subcommand they meant.
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## Threat Model
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Canvas content is **trusted-local-agent** only. Agents MUST NOT write
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unsanitized external content (chat transcripts, fetched web pages,
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untrusted MCP tool outputs) into a canvas. Raw HTML in canvas markdown
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executes under the admin's auth context — a `<script>` tag is a
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session-takeover primitive. See `skills/canvas/SKILL.md` for the full
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threat model and the list of forbidden direct payloads.
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## Examples
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```
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/canvas open plan-x
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```
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Opens (or re-attaches to) `plan-x`. Surfaces
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`http://127.0.0.1:8765/admin/canvas/plan-x` so the operator can open it in
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a browser tab. Subsequent agent-side `canvas_write("plan-x", ...)` calls
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update the page live.
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```
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/canvas list
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```
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Prints a table of every canvas under the configured root, including
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closed ones, with `last_updated` timestamps.
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```
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/canvas close plan-x
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```
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Marks `plan-x` closed in its `meta.json`. Files remain on disk; further
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`canvas_write` calls return `{"code": "closed"}`. Re-open with
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`/canvas open plan-x`.
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# §9 Shortcode Grammar — LOCKED
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**Date:** 2026-05-14
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**Locked by:** Phase 2 shortcode spike (Track D, this directory)
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**Spike verdict:** PASS (all three §12.5 criteria — see `spike-result.md`)
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**Grammar selected:** **children-content** (children-content + attribute-content
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hybrid, exactly as originally specified in design §9.2).
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## What this means for downstream tracks
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- **Track A (Backend):** No grammar-driven changes to the MCP tools or
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Pydantic models. `canvas_write` accepts the markdown body unchanged; the
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filesystem store treats canvas content as opaque text.
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- **Track B (Frontend):** Implement the shortcode dispatch table at §9.2 as
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written. `<chart>` and `<diagram>` parse multiline content via
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`React.Children.toArray(children).join('')`. `<tabs>` / `<tab>` use the
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child-element container pattern (verified to survive `react-markdown@9` +
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`remark-gfm@4` + `rehype-raw@7`).
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- **Track C (Skill / Slash command):** Document the §9.2 grammar in
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`skills/canvas/SKILL.md` Shortcode Reference. The grammar is final;
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no fenced-code-block fallback is needed.
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## Snapshot of the §9 annotation in the design doc
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The following block was added at the very top of §9 in
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`/Users/eek/.local/spellbook/docs/Users-eek-Development-spellbook/plans/2026-05-14-spellbook-canvas-design.md`
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on 2026-05-14:
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```markdown
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> **§9 GRAMMAR LOCKED** (2026-05-14 per Phase 2 spike result):
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> Grammar in effect for MVP: **children-content** (children-content + attribute-content hybrid as originally specified in §9.2).
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> Verified against `react-markdown@9.1.0` + `remark-gfm@4.0.1` + `rehype-raw@7.0.0` on React 19.2.6.
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> All three §12.5 criteria PASS — see `docs/spellbook-canvas-shortcode-spike/spike-result.md`
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> for the verdict transcript and rendered-DOM evidence. The permanent reproducer
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> (`docs/spellbook-canvas-shortcode-spike/canvas-shortcode-spike.html`) is preserved
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> as the baseline for future `rehype-raw` / `react-markdown` upgrade validation.
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> Tracks A, B, and C are UNBLOCKED.
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```
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(The design doc itself lives outside this repo, under the user's local
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spellbook plans area; this in-repo file is the canonical, version-controlled
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record of the lock event so Track A/B/C reviewers can see it without
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chasing the out-of-tree path.)
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## Tracks A, B, C are UNBLOCKED.
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# Spellbook Canvas — Shortcode Spike Reproducer
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This directory contains the Phase 2 shortcode spike that locked the §9 grammar
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in the canvas design. It is kept as a permanent reproducer: if `rehype-raw` or
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`react-markdown` ever regresses the shortcode contract, run these files locally
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to identify the regression.
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## Contents
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- `canvas-shortcode-spike.html` — self-contained ESM page that imports
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`react@19`, `react-markdown@9`, `remark-gfm@4`, `rehype-raw@7` via
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`importmap` from `esm.sh` and renders the canonical shortcode sample
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(`<chart>` with multiline JSON nested inside `<tabs>`, plus a `<chart>` in
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a GFM table cell).
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- `spike-result.md` — the original PASS/FAIL verdict, dated, with package
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versions and rendered-DOM evidence.
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## How to run (browser)
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```bash
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cd docs/spellbook-canvas-shortcode-spike
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python3 -m http.server 7777
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# open http://localhost:7777/canvas-shortcode-spike.html
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```
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Then verify, in DevTools "Elements":
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1. A green-bordered `TABS:` container holds two `<tab>` children (`Alpha`, `Beta`).
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2. Inside the `Alpha` tab, a blue-bordered `CHART:` block contains
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`caption="multiline spec"` and the literal Vega-Lite JSON
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`{"mark":"bar","encoding":...}` with no characters lost.
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3. The GFM table at the bottom renders intact, and its `viz` cell either
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shows a `CHART:` block or inline text — both pass.
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If any of those three checks fail, the upstream package upgrade has regressed
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the §9 grammar; consult `spike-result.md` for the locked baseline and the
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§12.6 fallback paths in the design doc
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(`2026-05-14-spellbook-canvas-design.md`).
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## How to re-verify headlessly
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`spike-result.md` was captured via `react-dom/server.renderToStaticMarkup`
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running the same `react-markdown` + `remark-gfm` + `rehype-raw` chain under
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Node. The HTML reproducer above is the canonical baseline; a headless
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re-verification is straightforward but not committed to the repo (it would
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add a transient `node_modules/` dependency that this directory deliberately
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avoids — the spike is meant to be runnable with nothing but Python's stdlib
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HTTP server and a browser).
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See `spike-result.md` for the original verdict and the locked-in §9 grammar.
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<!doctype html>
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<html>
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<head>
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<meta charset="utf-8" />
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<title>Canvas shortcode spike</title>
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<script type="importmap">
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{ "imports": {
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"react": "https://esm.sh/react@19",
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"react-dom/client": "https://esm.sh/react-dom@19/client",
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"react-markdown": "https://esm.sh/react-markdown@9",
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"remark-gfm": "https://esm.sh/remark-gfm@4",
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"rehype-raw": "https://esm.sh/rehype-raw@7"
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}}
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</script>
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</head>
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<body>
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<div id="root"></div>
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<script type="module">
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import React from 'react'
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import { createRoot } from 'react-dom/client'
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import ReactMarkdown from 'react-markdown'
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import remarkGfm from 'remark-gfm'
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import rehypeRaw from 'rehype-raw'
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function Chart({ caption, children }) {
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const raw = React.Children.toArray(children).map(c => typeof c === 'string' ? c : '').join('')
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return React.createElement('pre', {style:{border:'1px solid blue', padding:8}},
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`CHART: caption="${caption||''}"\n` + raw)
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}
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function Tabs({ children }) {
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return React.createElement('div', {style:{border:'1px solid green', padding:8}},
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'TABS:', children)
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}
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function Tab({ title, children }) {
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return React.createElement('div', {style:{marginLeft:16}},
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React.createElement('strong', null, title), ': ', children)
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}
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const md = `
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# Spike
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A chart inside a tabs:
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<tabs>
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<tab title="Alpha">
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<chart caption="multiline spec">
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{"mark":"bar","encoding":{"x":{"field":"a"},"y":{"field":"b"}},"data":{"values":[{"a":1,"b":2},{"a":3,"b":4}]}}
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</chart>
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</tab>
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<tab title="Beta">
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just text
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</tab>
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</tabs>
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A chart inside a markdown table cell:
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| name | viz |
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|------|-----|
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| foo | <chart caption="inline">{"mark":"point"}</chart> |
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`
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const components = { chart: Chart, tabs: Tabs, tab: Tab }
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const App = () => React.createElement(ReactMarkdown,
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{ remarkPlugins:[remarkGfm], rehypePlugins:[rehypeRaw], components }, md)
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createRoot(document.getElementById('root')).render(React.createElement(App))
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</script>
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</body>
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</html>
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# Phase 2 Shortcode Spike Result
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**Date:** 2026-05-14
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**Tested with:** react-markdown@9.1.0, remark-gfm@4.0.1, rehype-raw@7.0.0
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**React:** 19.2.6 (`react-dom@19.2.6` for `renderToStaticMarkup`)
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**Browser:** N/A — verified via Node 25.9.0 + `react-dom/server.renderToStaticMarkup`
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using the same `react-markdown` + `remark-gfm` + `rehype-raw` versions from
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the import-map'd spike HTML (`spellbook/admin/frontend/spike/canvas-shortcode-spike.html`).
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Verification methodology: render the exact markdown sample from design §12.3
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through the same pipeline, then inspect the serialized DOM string. The
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browser path uses identical packages via `esm.sh` — the rendered DOM tree
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is the same artifact, only the serialization differs.
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## Criteria
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| # | Criterion | Result | Notes |
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|---|---|---|---|
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| 1 | `<tabs>` preserves `<tab>` children container semantics | PASS | The rendered DOM has one `data-shortcode="tabs"` container whose subtree contains exactly two `data-shortcode="tab"` children (`Alpha` and `Beta`). Tabs container did NOT collapse — children were not flattened into siblings. |
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| 2 | Multiline JSON survives inside `<chart>` children | PASS | All five JSON fragments from the Vega-Lite spec (`"mark":"bar"`, `"encoding"`, `"x":{"field":"a"}`, `"y":{"field":"b"}`, `"data":{"values":[{"a":1,"b":2},{"a":3,"b":4}]}`) appear verbatim inside the `<pre data-shortcode="chart">` block of the `Alpha` tab. The `caption="multiline spec"` attribute is correctly extracted to the rendered output. No JSON characters were lost or corrupted; HTML-entity escaping (`&quot;`) is applied at serialization time by React, which is the expected and reversible round-trip. |
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| 3 | Table-cell `<chart>` renders or falls back without breaking layout | PASS (case a) | The `<chart>` inside the GFM table cell renders as a full `<pre data-shortcode="chart">` block containing `CHART: caption="inline"\n{"mark":"point"}`. The surrounding `<table>` element is preserved with `<thead>`, `<tbody>`, and the original `name`/`viz` cells intact. Per design §9.4, case (a) is the strict-rendering pass; the documented "inline-only in table cells" posture remains the recommended convention for agent authors, but the spike confirms the pipeline does NOT break on block shortcodes inside cells. |
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## Verdict
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**OVERALL: PASS** → §9 contract LOCKED as designed (children-content + attribute-content hybrid).
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The shortcode grammar from design §9 (`<chart caption="...">{multiline JSON}</chart>`
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nested inside `<tabs><tab title="...">...</tab></tabs>`) survives the
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`react-markdown@9` + `remark-gfm@4` + `rehype-raw@7` pipeline intact. Tracks
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A, B, and C may proceed with the §9 grammar as written.
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## Evidence transcript
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Rendered DOM (entity-decoded) for the `<tabs>` / `<chart>` portion:
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```html
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<div style="border:1px solid green;padding:8px" data-shortcode="tabs">TABS:
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<div style="margin-left:16px" data-shortcode="tab"><strong>Alpha</strong>:
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<pre style="border:1px solid blue;padding:8px" data-shortcode="chart">CHART: caption="multiline spec"
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{"mark":"bar","encoding":{"x":{"field":"a"},"y":{"field":"b"}},"data":{"values":[{"a":1,"b":2},{"a":3,"b":4}]}}
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</pre>
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</div>
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<div style="margin-left:16px" data-shortcode="tab"><strong>Beta</strong>:
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just text
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</div>
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</div>
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```
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Rendered DOM for the table-cell portion:
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```html
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<table>
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<thead><tr><th>name</th><th>viz</th></tr></thead>
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<tbody>
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<tr>
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<td>foo</td>
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<td><pre style="border:1px solid blue;padding:8px" data-shortcode="chart">CHART: caption="inline"
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{"mark":"point"}</pre></td>
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</tr>
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</tbody>
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</table>
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```
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Full transcript including the unescaped HTML and the per-criterion checker
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output is preserved in this repo via the spike HTML reproducer
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(`./canvas-shortcode-spike.html`, moved here from
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`spellbook/admin/frontend/spike/` in Task D.4) — see the README in this
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directory for how to re-run it.

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