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Build the canvas application pipeline - #3823

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k11kirky wants to merge 13 commits into
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posthog-code/canvas-application-build-plan
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Build the canvas application pipeline#3823
k11kirky wants to merge 13 commits into
mainfrom
posthog-code/canvas-application-build-plan

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@k11kirky

@k11kirkyk11kirky commented Jul 26, 2026•
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Why

Canvases need to support arbitrary client-side browser applications while keeping generation safe, reproducible, and available to every task.

Changes

  • Add one browser-application contract for React, Quill, HTML, Three.js, D3, ECharts, workers, WebAssembly, and bounded binary assets.
  • Add deterministic local validation, manifest-enforced runtime capabilities, and signed immutable cloud artifact rendering with legacy fallback.
  • Make canvas skills and complete or diff-aware guarded publishing available to every task.
  • Document storage, concurrency, retention, migration, security limits, and the future path toward hosted micro-app backends.

The cloud persistence and authoritative build worker are implemented in PostHog/posthog#73727.

Test plan

  • Shared, core, UI, builder, plugin, and runtime-capability test suites
  • Typechecks for shared, core, workspace-server, host-router, and UI packages
  • Host-boundary validation, Biome, dependency policy, worker, asset, and WebAssembly fixtures

Created with PostHog Code

@k11kirky
docs: plan canvas application build pipeline
f1d1679
Generated-By: PostHog Code
Task-Id: f2d133f0-a9e6-4a16-8ecd-fc0a20bab2c3
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trunk-ioBot commented Jul 26, 2026

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  • To merge this pull request, check the box to the left or comment /trunk merge below.

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@k11kirky
docs: unify canvas application source model
c3e67fe
Generated-By: PostHog Code
Task-Id: f2d133f0-a9e6-4a16-8ecd-fc0a20bab2c3
@k11kirky
docs: make canvas build plan self-contained
ee8b652
Generated-By: PostHog Code
Task-Id: f2d133f0-a9e6-4a16-8ecd-fc0a20bab2c3
@k11kirky
docs: define canvas source and artifact storage
e2a1f06
Generated-By: PostHog Code
Task-Id: f2d133f0-a9e6-4a16-8ecd-fc0a20bab2c3
@k11kirky
docs: resolve canvas build policy decisions
aac8b1f
Generated-By: PostHog Code
Task-Id: f2d133f0-a9e6-4a16-8ecd-fc0a20bab2c3
@k11kirky
docs: define canvas run history and capabilities
ff234ed
Generated-By: PostHog Code
Task-Id: f2d133f0-a9e6-4a16-8ecd-fc0a20bab2c3
@k11kirky
feat(canvas): add application build contracts and service
ce0142b
Generated-By: PostHog Code
Task-Id: f2d133f0-a9e6-4a16-8ecd-fc0a20bab2c3
@github-actions

github-actionsBot commented Jul 26, 2026•
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React Doctor found no issues in the changed files. 🎉

Reviewed by React Doctor for commit 1b1c81d.

@k11kirky
feat(canvas): enforce artifact runtime capabilities
78f85ee
Generated-By: PostHog Code
Task-Id: f2d133f0-a9e6-4a16-8ecd-fc0a20bab2c3
@k11kirky
feat(canvas): add application persistence and task integration
575b053
Generated-By: PostHog Code
Task-Id: f2d133f0-a9e6-4a16-8ecd-fc0a20bab2c3
@k11kirky
fix(canvas): satisfy shared export ordering
649d211
Generated-By: PostHog Code
Task-Id: f2d133f0-a9e6-4a16-8ecd-fc0a20bab2c3
@k11kirkyk11kirky mentioned this pull request Jul 26, 2026
Closed
2 tasks
k11kirky added a commit to PostHog/posthog that referenced this pull request Jul 26, 2026
@k11kirky
feat(canvas): typed canvas source tools and bundled authoring skills
250c6b8
Phase 1 of the canvas application build pipeline plan (PostHog/code#3823):
- Canvas source-project API on the desktop file system: list/create canvases,
read the source project + current version, validate a candidate project
(structured diagnostics), and publish guarded by
expected_current_version_id. A compatibility adapter presents legacy
meta.code canvases as a synthetic web project and reduces valid projects
back to the single-file storage, so this ships before the build service
with no storage changes.
- MCP tools (desktop-file-system-canvas-*) so any authorized local or cloud
task can author canvases without the canvas composer's embedded prompt.
- Five bundled skills extracted from the canvas authoring contract:
building-canvases, building-react-quill-canvases, building-html-canvases,
querying-canvas-data, validating-and-publishing-canvases.
Generated-By: PostHog Code
Task-Id: 9e9a7b3c-f90d-4867-aa0d-b9acc83e26e1
@k11kirkyk11kirky mentioned this pull request Jul 26, 2026
Closed
2 tasks
@k11kirky
feat(canvas): connect universal application publishing
6b2081b
Route canvas generation through shared skills and validation, expose cloud validation through the typed API, align source contracts with backend responses, and harden local builds against undeclared dependencies and unsafe HTML.
Generated-By: PostHog Code
Task-Id: f2d133f0-a9e6-4a16-8ecd-fc0a20bab2c3
@k11kirkyk11kirky changed the title Plan the canvas application build pipelineBuild the canvas application pipelineJul 26, 2026
This was referenced Jul 26, 2026
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@k11kirky
Merge branch 'main' into posthog-code/canvas-application-build-plan
cb010e1
Generated-By: PostHog Code
Task-Id: f2d133f0-a9e6-4a16-8ecd-fc0a20bab2c3
@k11kirky
feat(canvas): complete browser application runtime
1b1c81d
Generated-By: PostHog Code
Task-Id: f2d133f0-a9e6-4a16-8ecd-fc0a20bab2c3
This was referenced Jul 26, 2026
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@k11kirkyPostHog

k11kirky commented Jul 27, 2026

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Superseded by the phased canvas build pipeline: #3824 → #3825 → #3826 → #3827 → #3834 → #3835. The continuation phases retain the stacked contracts and add authoritative artifact rendering plus advanced assets and workers.

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@k11kirky