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The Lens skill made the agent call `screenshot` for every variant of every element, hold the returned path, resist a list of documented traps about not cropping or moving the file, and hand-run `shasum -a 256` to notice a capture that came back byte-identical because the variant never reached the screen. Every one of those inputs is already server-side: `propose_variant` takes the round's `udid` and is already describing that device at propose time to auto-capture the crop frame. `variant.previewImage` is now optional. Omitted, the tool screenshots the device at the same moment it captures the frame, dispatching the `screenshot` tool so the capture keeps its per-platform routing and its upright-on-rotated-Android handling. The device is the one passed on this call or, failing that, the round's; with neither and no `previewImage` the call is refused rather than staging a card with no preview. Every server capture is hashed, and a hash matching another variant of the same element is refused by name: that variant is not on screen, so the two cards would carry one thumbnail. The check is scoped to a single element because two elements of one screen legitimately share a capture, each card cropping it to its own frame.
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ChangesLens automatic preview capture
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to This change automates preview capture and groups proposals by normalized matchers. An outstanding formatting failure and the possibility of merging case-distinct matcher cards should be resolved before merge, because valid variant proposals may be rejected or attributed to the wrong card. Sequence Diagram(s)sequenceDiagram
participant Client
participant propose_variant
participant screenshot
participant VariantProposalStore
Client->>propose_variant: propose variant
propose_variant->>VariantProposalStore: resolve stored device
propose_variant->>screenshot: capture device screen
screenshot-->>propose_variant: preview image
propose_variant->>VariantProposalStore: validate preview hash
propose_variant->>VariantProposalStore: store proposal and frame
VariantProposalStore-->>Client: staged variant
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 44.44% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 9 functions across 4 files. (1 skipped: 1 unsupported.)
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🧪 Generate unit tests (beta)
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packages/tool-server/test/variant-proposals.test.tsParsing error: Unable to parse the specified 'tsconfig' file. Ensure it's correct and has valid syntax. packages/docs/tsconfig.json(2,14): error TS6053: File ' Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out. Comment |
…d-scope prose - propose_variant description + SKILL.md: the capture fails only when no udid was ever set, not "no udid this round" — the device carries across rounds. - Add a test that a screenshot failure propagates and stages nothing (the documented "screenshot cannot be taken" failure mode, previously untested). - Add a test that the duplicate guard runs across case/whitespace-divergent matchers for one element, pinning proposalKey normalization now reused by the guard.
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Inline comments:
In `@packages/skills/skills/argent-lens/SKILL.md`:
- Line 23: Update the udid guidance in the propose_variant instructions to
require passing udid when no device is stored or when switching devices; allow
omission when the stored device remains appropriate, including across rounds.
- Line 80: Update the code fence in the SKILL.md content to specify the text
language after its opening marker, preserving the fenced content unchanged.
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…curate
The check ran in `propose_variant` before `captureElementFrame`, which parks on
a real describe for up to CAPTURE_BUDGET_MS. Two proposes of one element
overlapping across that await both passed the check and both staged, so the
Lens showed the two identical thumbnails the guard exists to prevent. Comparing
inside `proposeVariant` puts the compare and the append in one synchronous step,
and drops the completed-round special case: `autoRollIfCompleted` has already
rolled the round away by then.
The refusal also named the wrong things. It interpolated the refused call's own
`element` rather than the card the twin sits on, so two elements sharing a
matcher — one card, by this store's own identity rule — were told about a card
that does not exist. And it asserted "is not on screen" even when the twin was
the same variant, where that is false and its remedy ("re-apply and propose
again") cannot change the capture; that case now says the variant is staged.
Prose: `udid` is sticky across rounds and now decides which device is captured,
so both the schema and the skill say to pass it rather than advertising the
carry-over. The byte-equality catch is described as the backstop it is - a
ticking status-bar clock defeats it - instead of as the "didn't apply / froze"
detector. `rules/argent.md` still routed agents through the removed screenshot
step.
`min(1)` admits " ", which was truthy enough to suppress the capture and then stored verbatim, so `/preview/variant-image` 404'd and the card rendered "No preview" with nothing pointing at the cause. Trimmed like the `udid` directly above it, so a blank value falls through to the capture path.
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[Diplomat, Fable 5.1]: One LOW finding left unfixed from the review swarm, filed rather than changed because the fix has a trade-off worth a second opinion. The confirmed HIGH/MEDIUM-class items (the check-then-act race on the duplicate guard, the misattributed and self-contradictory refusal messages, the stale-udid capture hazard) are fixed in 516e516 and d031544.
| // The tool, not `captureScreenshotUpright` directly: only the tool knows | ||
| // which platforms have no simulator-server backend (tvOS, Vega, Chromium), | ||
| // where resolving one hangs on its ready timeout. | ||
| const shot = await invokeSubTool<{ image: ArtifactHandle }>(registry, ctx, "screenshot", { |
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[Diplomat, Fable 5.1]: A failed capture leaves the round's device unrecorded, so a later udid-less propose is refused for having no device.
this.device is only assigned inside proposeVariant (variant-proposals.ts:487), which this throw never reaches. So the sequence propose(udid: SIM-1) → screenshot fails → propose() with no udid hits the !udid guard and refuses with "propose_variant has no device to capture the variant preview from", even though the agent did pass SIM-1 moments earlier and the skill's own contract says the device is remembered.
Trigger: any first propose of a session whose capture fails — simulator-server not yet ready, device still booting — followed by a propose that relies on the remembered device.
Not changed here because recording the device before the capture succeeds cuts both ways: it would also remember a mistyped or wrong udid and hand it to every later udid-less propose, turning a clear per-call refusal into a silently wrong capture device. Worth deciding deliberately rather than as part of this PR.
…t is meant Three corrections to the duplicate refusal, all from re-reading it against the UI it describes: Two element names sharing one matcher are one card, so the twin sits on a card the refused call never named. Blaming the device there sent the agent to re-apply a variant that was already on screen, which can never clear a matcher collision; that case now names both elements, the matcher they share, and the fix. A card is per element and holds every variant as a row, so a duplicate adds a row, never a card. And the tool description offered "re-apply the variant" as the single remedy, which the same-variant branch exists to contradict. `Variant.previewHash` still pointed at `findDuplicatePreview`, deleted when the comparison moved into `proposeVariant`. The skill's §5 example passed `udid` on one of three calls, modelling the carry-over the §2 rule now tells agents not to rely on, and §2 claimed distinct `element` values always make distinct cards, which the shared-matcher case falsifies. Tests: pin the twin's card and the `udid` trim, both of which survived mutation.
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Actionable comments posted: 2
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Inline comments:
In `@packages/skills/skills/argent-lens/SKILL.md`:
- Line 21: Update the propose_variant documentation to define card grouping by
the match matcher: calls with the same matcher accumulate variants even when
element names differ, while different match values create separate cards. Retain
the existing behavior for calls without match where applicable.
In `@packages/tool-server/src/utils/variant-proposals.ts`:
- Around line 295-296: Update proposalKey so case is preserved for exact matcher
types such as label, identifier, and role, while retaining lowercase
canonicalization only for matcher types with case-insensitive lookup semantics.
Keep trimming and the existing by/value key structure unchanged.
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The skill described grouping in terms of `element`, which is only true because
`match` defaults to `{ by: "text", value: element }`. Two calls sharing a matcher
are one card whatever their `element` says, and two matchers are two cards even
under one `element`.
Pin the matcher key against the resolver it has to agree with: `proposalKey`
compares case- and whitespace-insensitively because `normLabel` and the preview
UI's `vpNormLabel` do, for identifier/label/role alike. A stricter key would put
one on-screen element on two cards with both bubbles anchored to the same node,
and nothing caught that.
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Microoptimization, no need to burn time on Lens for now. |
What
propose_variantcaptures the variant preview itself.variant.previewImageis optional; omitted, the tool screenshots the device at the same moment it already describes it for the crop frame.Why
packages/skills/skills/argent-lens/SKILL.md§3 Step 2 mandated, per variant per element: callscreenshot, hold the returned path, do not crop / resize / re-encode / move the file, and hand-runshasum -a 256against the previous path to notice a capture that came back byte-identical because the variant never reached the screen.Both inputs of that work are already server-side.
propose_varianttakes the round'sudid, andcaptureElementFramealready describes that device at propose time to auto-capture the cropframe- so the tool is talking to the device at exactly the moment the screenshot is needed. Same class as #984 (auto-screenshot aftertv-remote,adb reversefolded intolaunch-app).Behaviour
variant.previewImageomitted - the tool captures the screen and uses it as the preview.variant.previewImagepassed - used verbatim, exactly as before. Not read, not hashed, so anhttp(s)URL ordata:URI keeps working, and an explicit path is never subject to the duplicate guard.params.udidif given, else the round's device (VariantProposalStore.getDevice()), which is how the schema already documentsudid("set it on the firstpropose_variantof a round; later calls may omit it"). The frame capture now resolves the device the same way, so a laterudid-less propose gets a frame too instead of silently getting none.previewImage- refused withInvalidToolInputError(HTTP 400) naming both ways out. It does not stage a card with no preview.Why the
screenshottool rather thancaptureScreenshotUprightdirectlyThe tool already routes per platform, and its own comment records why that matters: a tvOS udid classifies as iOS by shape, so declaring
simulatorServerReffor it spawns a backend that cannot drive it and hangs on the ready timeout. Vega and Chromium have no simulator-server path either. CallingcaptureScreenshotUprightfrom here would have re-introduced exactly that.invokeSubToolis the repo's existing nested-dispatch helper (run-sequence, flow-run, flow-add-step), so the child invocation keeps the outer AI-client/platform attribution.Duplicate captures: refusal, not a warning
A server capture is sha-256'd, stored on the variant, and compared against the other variants of the same element in the live round. A match is a refusal that names the colliding variant.
Refusal over a warning: the skill's own rule was already "Fix that before proposing, never propose anyway", and a warning buried in a non-blocking tool's result is exactly the thing an agent skips. The two false-positive shapes the task flagged are both designed out:
frame. So the comparison is scoped to one element. Across elements, identical is fine and nothing is reported.findDuplicatePreviewreturns null on a completed round, because the nextproposeVariantrolls it away and its variants are not the ones the new capture would sit beside. Without that, round 2's first capture of an unchanged screen would be refused against round 1's.Within one element, two byte-identical full-screen captures have no legitimate reading: nothing on the device changed, so one of the two variants is not on screen. The message says so and names the twin, and points at
variant.previewImagefor the documented case where the element cannot be on screen at propose time.Prose updated
packages/skills/skills/argent-lens/SKILL.md- §1 golden rule and overview, §2 params +udidparagraph, §3 Step 2 (the numbered loop drops from 6 steps to 5; the "screenshot straight through" +shasumstep is gone, and the crop/copy warning moves to thepreviewImageoverride paragraph where it still applies), §4 "Distinct screenshot per variant", §5 example.packages/docs/docs/features/lens.mdx- step 2/3 of "How a review round works".propose-variant.ts- thepreviewImageparam description and the tool description (which gains the failure modes it did not previously state).Tests
packages/tool-server/test/lens-auto-preview-capture.test.ts, 8 tests. They drive the real tool throughregistry.invokeToolagainst a stubscreenshottool, soinvokeSubTooldispatch is exercised rather than mocked away. The store is a module singleton whosedevicedeliberately outlivesreset(), so each test takes a fresh module graph.Mutation table
Every mutation was applied to the source, the file re-run, and the source restored. Each kills exactly the test that claims to pin it.
previewImage = shot.image.hostPath->undefinedlet previewImage = params.variant.previewImage->undefined|| getDevice()fallbackfindDuplicatePreviewcompares across all proposals, not one elementif (this.completed) return nullpreviewImageand run the guard on itincludeImageInContext: falsefrom the sub-invoke argspreviewHashon the stored variantAn earlier M8 variant (hash the explicit preview with no
try) killed the explicit-verbatim test instead, because that test's explicit path does not exist on the host - which is itself the point: it pins that an explicitpreviewImageis never opened, so a URL ordata:URI cannot be broken by a future hash.Gates run
npm run buildnpm run lintnpm run knipgetDevice()was added)npm run typecheck:tests -w @argent/tool-servernpm run formatcd packages/docs && npx docusaurus buildinteraction-messages.test.tsis unaffected: no tool added or removed, and all three formatters are untouched. The SpiderShield description gate scores a mean, and this description keeps its action verb, "Use when" trigger andReturns {...}block while gaining an explicit failure paragraph, so it can only move up.Deliberately not changed
variant.framestays an agent-supplied override; the auto-capture that was already there is untouched apart from resolving the device the same way the preview does.previewImageduplicates are still accepted. Pointing two variants at one path is the thing the skill forbids, but refusing it would change the behaviour of a parameter this change is meant to leave alone, and hashing an explicit value would breakhttp(s)/data:previews.screenshottool's default, not full resolution. That is byte-for-byte the artifact an agent handed over before this change, and full-res is the scale some Android emulators reject outright ("wrong data size") - the reasonscreenshot-diffwraps its own full-res capture in a fallback./preview/variant-imageallow-list (os.tmpdir / cwd / /tmp) is untouched. The path now comes from the samescreenshottool the agent used to call, so whatever it hands back is what was being served before.elementlabel instead of the matcher). No feature overlap, but whichever lands second should carry the other's grouping intofindDuplicatePreview, which reuses the extractedproposalKeyhelper.Summary by CodeRabbit
New Features
Documentation