feat(channels): add the structured Activity view (4/4) by puemos · Pull Request #3815 · PostHog/code

puemos · 2026-07-25T14:58:27Z

Problem

The task thread has no structured place for lifecycle history, durable artifacts, and human comments.

Changes

Add Timeline, Artifacts, and Comments tabs to the flag-gated task panel.
Collect pull requests, canvases, plans, and Slack context across task runs.
Preserve selected historical pull requests when opening review.
Leave the flag-off Thread experience unchanged.

This is PR 4 of the stack, based on #3814. It completes the flag-on Spaces + Activity experience.

How did you test this?

pnpm --filter @posthog/core test -- src/canvas/runArtifactSchemas.test.ts
Three focused UI suites covering artifacts, selected PR navigation, and the shared Thread panel (13 tests)
pnpm typecheck in packages/ui

Automatic notifications

Publish to changelog?
Alert Sales and Marketing teams?

Created with PostHog Code

github-actions · 2026-07-25T14:58:56Z

React Doctor found 1 issue in 1 file · 1 warning.

1 warning

src/features/canvas/components/ActivityTimeline.tsx

⚠️ src/features/canvas/components/ActivityTimeline.tsx:160 Repeated property access in a loop js-cache-property-access

_{Reviewed by React Doctor for commit 1dbd099.}

puemos · 2026-07-25T15:02:50Z

This stack of pull requests is managed by Graphite. Learn more about stacking.

trunk-io · 2026-07-27T13:08:03Z

😎 Merged directly without going through the merge queue, as the queue was empty and the PR was up to date with the target branch - details.

veria-ai · 2026-07-27T13:11:30Z

PR overview

All previously flagged issues have been addressed. No open security concerns remain on this pull request.

Security review

No open security issues remain on this pull request.

Fixed/addressed: 1 · PR risk: 0/10

posthog · 2026-07-27T18:50:17Z

✅ Visual changes approved by @puemos — baseline updated in 5048498.

View this run in PostHog

12 removed.

k11kirky · 2026-07-28T07:25:49Z

 ) {
  const cloudRunState = useCloudRunState(taskId, task);
-  const { prUrl, effectiveBranch, repo, isRunActive } = cloudRunState;
+  const prUrl = prUrlOverride ?? cloudRunState.prUrl;


When this switches to a historical PR, usePrChangedFiles retains the previous query data via placeholderData, and changedFiles also falls back to cloudRunState.fallbackFiles whenever the selected PR has not returned files yet. As a result, the review can render the latest/previous PR files while prUrl already names the historical PR; actions such as comments then target the new PR URL with the wrong diff visible. Please keep the historical selection loading until its own files resolve and do not use latest-run fallbacks for an explicit override.

puemos · 2026-07-28T08:32:51Z

Merge activity

Jul 28, 8:32 AM UTC: A user started a stack merge that includes this pull request via Graphite.
Jul 28, 8:52 AM UTC: Graphite couldn't merge this pull request because a downstack PR refactor(canvas): share thread and PR artifact logic (1/4) #3812 failed to merge.

Replace the flag-gated task thread with Timeline, Artifacts, and Comments views. Include multi-run artifacts and selected historical pull request review while leaving flag-off behavior unchanged. Generated-By: PostHog Code Task-Id: 6190e713-9b80-43d9-a05c-5e3b1ecdf297

The Activity panel's header was padding-sized (~41px) while the pane to its left — TabbedPanel's tab bar — is a fixed 32px row, so the two bottom borders never lined up. The panel also stacked a title row on top of a tabs row where the left pane has a single strip. Give ActivityPanel its own 32px header carrying the tabs directly: no separate "Activity" title row, the tab list fills the row so the line indicator lands on the bottom border, and the window controls sit right-aligned. Matches TabbedPanel and ReviewToolbar, which share the same height and border token. The shared ThreadPanelHeader is now the legacy panel's alone, so it stays exactly as it was — flag-off chrome is unchanged. Generated-By: PostHog Code Task-Id: 8ccf3555-2c68-4dbb-8b9f-1a96fd85d95a

Starring a channel is already reachable from the sidebar back row's hover star and the channel list's context menu, so the header's copy was a third affordance for the same action sitting next to the channel name chip. Generated-By: PostHog Code Task-Id: 8ccf3555-2c68-4dbb-8b9f-1a96fd85d95a

The pane read the run artifact manifest and then dropped everything on `type === "plan"` — a type nothing in the product has ever written. The only deliverable type agents actually produce is `output`, via the `upload_artifact` tool, so the manifest branch was unreachable and files handed back by a run never appeared. Verified against a live run's manifest: 6 `output`, 2 `user_attachment`, zero `plan`. The `plan` row was speculative — down to a bare-UUID fallback for names that never arrive — so it goes rather than shipping a UI affordance for data that doesn't exist. It can come back with a producer. Same inversion is why the conversation's Files box showed these while the pane said "No artifacts yet": it filters to `output`, the exact complement. - `parseRunPlans` becomes `parseRunArtifacts(raw, types)`, and reads the `size`/`content_type`/`uploaded_at` the rows need. - Re-uploads collapse to the newest per name: agents revise a deliverable and upload it again, and keeping every copy buries the current one under its own drafts. - `formatFileSize` moves out of CloudArtifactDownloads so both surfaces format sizes the same way. Generated-By: PostHog Code Task-Id: 8d187d00-0633-4706-8443-f79130b65f9f

The rows already use the same FileIcon the chat's file list does, so markdown resolves to the markdown icon and HTML to the HTML one. Lock that in — the row it replaced hardcoded a single clipboard glyph, and nothing else would catch a regression back to a generic icon. Generated-By: PostHog Code Task-Id: 8d187d00-0633-4706-8443-f79130b65f9f

This was referenced Jul 25, 2026

feat(channels): channel spaces and a structured task Activity view #3784

Closed

refactor(canvas): share thread and PR artifact logic (1/4) #3812

Merged

feat(channels): add scoped channel foundations (2/4) #3813

Merged

puemos mentioned this pull request Jul 25, 2026

feat(channels): add the flag-gated spaces layout (3/4) #3814

Merged

2 tasks

puemos force-pushed the posthog-code/channels-stack-3-spaces-ui branch from b5a9f27 to 7098f03 Compare July 25, 2026 15:10

puemos force-pushed the posthog-code/channels-stack-4-activity-view branch from 5903d4d to 99fdf5c Compare July 25, 2026 15:10

puemos force-pushed the posthog-code/channels-stack-3-spaces-ui branch from 7098f03 to 54ec82c Compare July 26, 2026 11:14

puemos force-pushed the posthog-code/channels-stack-4-activity-view branch 3 times, most recently from 1bdb330 to 4c2e2fb Compare July 26, 2026 12:40

puemos marked this pull request as ready for review July 27, 2026 07:07

puemos added the reviewhog ($$$) Reviews pull requests before humans do label Jul 27, 2026 — with Graphite App

puemos requested a review from k11kirky July 27, 2026 07:08

puemos self-assigned this Jul 27, 2026

puemos changed the title ~~feat(channels): add the structured Activity view~~ feat(channels): add the structured Activity view (4/4) Jul 27, 2026

puemos changed the base branch from posthog-code/channels-stack-3-spaces-ui to posthog-code/channels-stack-2-scope-foundations July 27, 2026 08:23

puemos changed the base branch from posthog-code/channels-stack-2-scope-foundations to posthog-code/channels-stack-3-spaces-ui July 27, 2026 08:24

puemos changed the base branch from posthog-code/channels-stack-3-spaces-ui to posthog-code/channels-stack-2-scope-foundations July 27, 2026 08:24

puemos changed the base branch from posthog-code/channels-stack-2-scope-foundations to posthog-code/channels-stack-3-spaces-ui July 27, 2026 08:25

puemos force-pushed the posthog-code/channels-stack-4-activity-view branch 2 times, most recently from 0d48de6 to b517013 Compare July 27, 2026 08:51

puemos requested a review from a team July 27, 2026 13:05

puemos force-pushed the posthog-code/channels-stack-4-activity-view branch from 3d8a6d7 to 8f2e076 Compare July 27, 2026 13:07

puemos changed the base branch from posthog-code/channels-stack-3-spaces-ui to main July 27, 2026 13:08

veria-ai Bot reviewed Jul 27, 2026

View reviewed changes

Comment thread packages/ui/src/features/sessions/components/ArtifactPreview.tsx

puemos force-pushed the posthog-code/channels-stack-4-activity-view branch from dbdbb67 to c8452c4 Compare July 27, 2026 17:59

puemos changed the base branch from main to posthog-code/channels-stack-3-spaces-ui July 27, 2026 18:02

puemos force-pushed the posthog-code/channels-stack-3-spaces-ui branch from 8a9e6f2 to 8bda314 Compare July 27, 2026 18:45

puemos force-pushed the posthog-code/channels-stack-4-activity-view branch from fa1742a to 2a1cd89 Compare July 27, 2026 18:45

k11kirky reviewed Jul 28, 2026

View reviewed changes

k11kirky approved these changes Jul 28, 2026

View reviewed changes

puemos added the Create Release This will trigger a new release label Jul 28, 2026

puemos force-pushed the posthog-code/channels-stack-3-spaces-ui branch from 8bda314 to 21c9bce Compare July 28, 2026 10:01

Base automatically changed from posthog-code/channels-stack-3-spaces-ui to main July 28, 2026 10:34

adamleithp mentioned this pull request Jul 28, 2026

feat(spaces): drive the sidebar list from the search box #3864

Merged

puemos added 5 commits July 28, 2026 12:39

puemos force-pushed the posthog-code/channels-stack-4-activity-view branch from 5048498 to 1dbd099 Compare July 28, 2026 10:39

trunk-io Bot merged commit f86beb3 into main Jul 28, 2026
33 checks passed

trunk-io Bot deleted the posthog-code/channels-stack-4-activity-view branch July 28, 2026 10:56

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feat(channels): add the structured Activity view (4/4) - #3815

feat(channels): add the structured Activity view (4/4)#3815
trunk-io[bot] merged 5 commits into
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posthog-code/channels-stack-4-activity-view

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puemos commented Jul 25, 2026

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