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fix(web,mobile): new replies show overwritten local images - #23213
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An agent can overwrite a local image at the same path and embed it in a new reply. The new reply reused the cached signed URL from the earlier reply, so the browser showed the previous bytes until a reload. Key each reply's media-file URL by a client-only cache revision (the reply's message id). It is stripped before the RPC, so a new reply mints its own URL while the existing atom TTL bounds the cache. Fixes #15676 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Videos keep their existing URL caching; only image embeds get the per-reply revision, matching mobile and the expanded video dialog. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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ApprovabilityVerdict: Approved at Macroscope's review found this PR approvable — This is a contained web/mobile bug fix that gives each assistant reply its own client-side media URL cache revision while preserving the existing server asset contract and default callers. The accompanying fixture files are development-only reproduction tooling, with no product-default, schema, security, or deployment changes. You can add or adjust custom eligibility rules. Learn more. |
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| Check name | Status | Explanation |
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The title clearly identifies the web and mobile fix for stale local images in new replies. |
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The pull request description includes all required sections: Problem, Change, Scope and approval, and Verification. It explains the reproduction, implementation, linked issue, test results, screenshot… |
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The pull request description includes all required sections: Problem, Change, Scope and approval, and Verification. It explains the reproduction, implementation, linked issue, test results, screenshots, recordings, and known verification limits. The scope section references triage and required Julius review, but it does not include an explicit maintainer approval comment.
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Review comments at @scripts/fixtures/image-cache-proof.py:
- Around line 44-45: Update the backup handling around `c.backup` to preserve
the original pre-seed projection backup when the same database is seeded again.
Reuse the existing backup if present, or create a uniquely named backup for each
seed, rather than overwriting the first recovery copy.
- Line 22: Update the font selection in the fixture-generation flow so callers
can provide a font path and, when the Liberation Sans path is unavailable, fall
back to an available Pillow font instead of raising. Keep image generation
working for --images-only and projection seeding without requiring that fixed
system font.
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📒 Files selected for processing: 10
apps/mobile/src/features/threads/ThreadFeed.tsxapps/mobile/src/features/threads/ThreadMarkdownImage.tsxapps/mobile/src/state/assets.tsapps/web/src/assets/assetUrls.tsapps/web/src/components/ChatMarkdown.tsxapps/web/src/components/chat/ChatMarkdownMedia.tsxapps/web/src/components/chat/TimelineAssistantRows.tsxpackages/client-runtime/src/state/assets.tsscripts/fixtures/image-cache-proof.jsonscripts/fixtures/image-cache-proof.py
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Dismissing prior approval to re-evaluate f7082ec
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Fixed both verified fixture-helper findings in f7082ecebb: preserve the first pre-seed backup and add optional font selection with a Pillow fallback. Focused disposable-state checks confirmed repeated backup preservation, default/explicit/fallback font rendering, and a clear invalid-font error. Product rendering code is unchanged. |
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Problem
An agent overwrites a local image, embeds the same path in a later reply, and the new reply displays the previous bytes until reload. Reproduced on Linux in the real web app with Claude: the PNG on disk was green while the new reply still rendered red.
Change
Key local image asset URLs by assistant message ID in web and mobile, so a new reply requests a fresh URL while chunks of the same reply share one entry. Strip the client-only revision before asset RPC calls. Existing callers without a revision keep their behavior. This does not snapshot image history or refresh an image overwritten within one message.
Include the synthetic PNG/SVG fixture data and stopped-server projection seed helper required to rebuild the evidence. No server contract or persisted app data changes.
Scope and approval
Fixes #15676
GitCafe: https://git.cafe/pingdotgg/t3code/issues/15676
Triaged bug via the automated issue flow: #15676.
via-triage; requires Julius review for unavailable client surfaces. No auto-merge orlandlabel.Verification
vp test run packages/client-runtime/src/state/assets.test.ts apps/mobile/src/state/assets.test.ts packages/client-runtime/src/state/runtime.test.ts: 28 passed across three files after merging current main.tsc-rs --noEmitin client-runtime, web and mobile: passed (client-runtime emits existing suggestions).git diff --check: passed; lint reports existing mobile warnings.Provenance and rendering environment
/home/ubuntu/wt/issue-15676on web5817/backend13857 and base checkout/home/ubuntu/wt/issue-15676-baseon web7881/backend15921; base reflog starts at b5a226e at 23:57:15 UTC. Existing metadata has no embedded SHA: attribution is reconstructed from checkout/reflog, launch logs and capture timeline, not cryptographically stamped at capture.16px / 24px -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif(computed stack; installed face not recorded). Themes: lightoklch(0.992 0 0), darkoklch(0.145 0 none). UI clock frozen at 2026-10-22 00:00 UTC for matching relative labels; timing marks use performance time, not frozen UI Date.Paired endpoint index
diff0is whole-surface absolute RGB difference amplified ×8 (black means equal);diffTis a magenta mask where maximum absolute RGB channel delta is >16/255. No crop/mask excludes surrounding UI. Counts below are pixels, not percentages. Endpoint differences can include layout/scroll/caret differences and do not themselves prove timing.Narrow light uses
base-narrow-light-settled.png. The earlierbase-narrow-light-final.pngshows Thinking with no R5 and is not the decisive before endpoint. Existing final-pair statistics already name the settled file; the packaging pass independently checked the matching diffs against it.Before — narrow light, stale blue R5:
After — narrow light, fresh yellow R5:
Static boards and whole-surface comparisons
Static fixture comparisons
Board 0 shows upper PNG/inline/file-URL/tall fixtures; boards 1–4 overlap the lower SVG/fragment/missing/blocked/linked/direct-data section. Repeated lower boards are not additional independent cases. Narrow boards match exactly; wide boards differ by 0 or 17 pixels consistent with composer caret. This establishes visual parity of captured fixtures, not correctness of every URL/fragment branch. Authored-size and spaced/encoded supplemental fixture data exists but has no captured board.
Other initial/expanded pairs and all metadata are linked in the artifact catalog below. Expanded overwrite images differ intentionally (base blue/head yellow); static gallery boards use yellow source bytes on both builds.
Recordings: steps and times
Times below are recovered marks in seconds from recording start; encoded duration is measured from the actual MP4. Marks are approximate and can diverge from encoded time after transport stalls/static-frame handling. Raw recordings are untrimmed. The overwrite happens through the fixture command outside the browser, so a colored transition alone does not document disk bytes; the script, metadata, reply labels and endpoint samples support that sequence.
Review sheets were regenerated during packaging directly from the current final
*-recording.mp4files (sampled 0%, 35%, 70%, 95%; not edited recordings). Old*-contact.pngfiles are excluded from publication because one was stale. Sheets are sampling aids, not a claim that every intervening frame was inspected.Current recording review sheet 1
Current recording review sheet 2
Current recording review sheet 3
Current recording review sheet 4
Honest matrix result
Supplement after merge and fixture commit
The primary agent independently reported a real-app no-reload check at e76c41919d on a 1280×800 browser: four loaded yellow images stayed yellow after same-path overwrite to RGB(208,0,208); a new Claude reply rendered magenta. The prompt itself also embeds magenta, so six elements represent four old replies, a user prompt and a new assistant reply. This is a supplemental still/pixel transcript, not paired-base evidence or a recording and separate from the paired recordings.
Primary check transcript
Model and harness: Claude Opus 5.5 through the Claude harness (implementation); GPT-6.1-Sol through the Codex harness (triage, proof and PR), both models reviewed.
Evidence
Recordings, where an on-page overlay names the side, the SHA, the row and the elapsed time: before.mp4 · after.mp4
chart.pngassets.createUrlWebSocket frames before the reloadcacheRevisionin any frame. Payload is exactly{"resource":{"_tag":"media-file",threadId,path}}Colours are sampled RGB of each rendered image: BLUE (18,97,232), YELLOW (255,225,0). Readouts: before / after.
M2 endpoint, 1440×900 light. Before: reply 2 is stale BLUE.
After: reply 2 is YELLOW and reply 1 stays BLUE.
M2 endpoint, 390×844 dark: before / after
23d8d8ee7d697d1e0420c53b037dfa4e0e46b5a5d30d749238e9743804487ed7. Image helper: mkimg.py.http.ts,ChatMarkdownMedia.tsxandassetUrls.tsare identical between the two. ThefileRevisionthat main adds (#23106) is not read on the chat image path. Even with that change, main still shows the stale image.Verification log
cacheRevisionin the raw WebSocket logs. It confirmed the server SHAs, the driver sha256 and that all 21 upload URLs resolve, with the MP4s byte-identical to the local files.