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Import the evaluated browser-safe codec without changing the viewer or legacy transport. Add standalone/Vitest checks, historical benchmark qualifications, and an unexecuted full-production-auto comparison runner. Keep application, Worker, and live transport integration as explicit draft deployment gates.
arx5 codes escaped, dictionary-substituted tuple JSON, so its raw-text priors barely transfer and the column model never sees a real newline. arx6 (compact tag g) codes the artifact bodies verbatim followed by the tuple, with a stronger integer-only context mixer (line-type context, run and deterministic inputs, two-layer mixing, APM chain), recomposed curated priors, reversible diff header elision, and a base-66 fraction wire over the chat-safe unreserved set that absorbs the coder flush and length marker. On a held-out set of 214 real artifacts it is 14.0% shorter than arx5 and shorter on every one, at roughly 3x the coding time. Truncated #g links fail to decode instead of rendering a garbled tail. #e and #f links decode unchanged, and auto falls back to arx5 when arx6 declines an envelope or misses the fragment budget. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. 📝 WalkthroughWalkthroughThis pull request adds ARX6 v3 encoding and decoding, integrates ARX6 with automatic fragment selection, and runs browser codec operations through a bounded Worker. It also adds experimental evaluation tooling, recorded measurements, tests, and protocol documentation. ChangesARX6 payload and browser encoding
Priority: ➖ Normal Estimated code review effort: 5 (Critical) | ~100 minutes Sequence Diagram(s)sequenceDiagram
participant LinkCreator
participant BrowserCodec
participant CodecWorker
participant FragmentCodec
LinkCreator->>BrowserCodec: Submit encode or decode with AbortSignal
BrowserCodec->>CodecWorker: Post queued request
CodecWorker->>FragmentCodec: Run async fragment encode or decode
FragmentCodec-->>CodecWorker: Return codec result
CodecWorker-->>BrowserCodec: Post result or error
BrowserCodec-->>LinkCreator: Resolve or reject request
Merge Risk: 🔵 Low · up to ARX6 v3 links, compatibility decoding, and cancellable browser encoding look ready to merge. One follow-up remains: the built-in example content still says ARX5 is the automatic codec, which no longer matches the documented ARX6 behavior. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to New links add corruption detection while retaining older decoding formats. Size limits and cancellable processing contain the reviewed exposure. Direct-processing fallback behavior and mixed-version deployments remain areas requiring care. Retained concerns Security review detailsSecurity Blast Radius
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
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| Preview URL: | https://b35efb51.agent-render.pages.dev |
| Branch Preview URL: | https://codex-arx6-consolidated.agent-render.pages.dev |
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| const priorIdChar = codec === "arx6" ? getArx6PriorId(decodedPayload) : decodedPayload.charAt(0); | ||
| // V2's unprimed model uses only its frozen code and the tuple schema. Fetching or requiring | ||
| // unrelated dictionaries would make an otherwise self-contained link fail while offline. | ||
| const unprimedArx6 = codec === "arx6" && decodedPayload.startsWith("2n"); |
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WARNING: Legacy unprimed ARX6 links still require unrelated dictionary assets
Only 2n bypasses the loaders, so opening a valid original #gn... link with a cold cache and unavailable dictionary endpoints reaches Arx4DictionarySkewError and returns asset-unavailable. The frozen n vector in tests/arx6-codec.test.ts is one such link. Its decoder does not need either dictionary: arx6PriorBytes("n") returns null, and raw-container reconstruction uses no substitutions. Use the already validated prior id to bypass dictionary loading for unprimed links in both supported wire versions.
| const unprimedArx6 = codec === "arx6" && decodedPayload.startsWith("2n"); | |
| const unprimedArx6 = codec === "arx6" && priorIdChar === "n"; |
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| : undefined; | ||
| loadFragmentModule() | ||
| .then(({ decodeFragmentAsync }) => decodeFragmentAsync(hash, options)) | ||
| .then(({ decodeFragmentInBrowser }) => decodeFragmentInBrowser(hash, options, abort.signal)) |
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WARNING: Fragment navigation waits behind uncancelled creator encoding
Start an Auto/ARX generation on the homepage, then click a sample while its compression or dictionary fetch is pending. This decode is queued behind generation in the shared serialized Worker. The hash effect cancels bundle-selection encoding, but not the creator's job; LinkCreator cancels only on unmount, and it stays mounted until this decode returns a valid artifact. Even a small deflate sample therefore waits for unrelated generation to finish or hit its 60-second deadline. Cancel the creator's in-flight generation when fragment navigation begins, before enqueueing its decode, rather than relying on the later unmount.
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Code Review SummaryStatus: 2 Issues Found | Recommendation: Address before merge Overview
Issue Details (click to expand)WARNING
Files Reviewed (18 files)
Incremental review of HEAD Static inspection only. Code, tests, builds, corpus reconstruction, browser checks, and benchmarks were not executed under the read-only restrictions. Runtime behavior, external-source availability, reported measurements, and regenerated hashes were not independently validated. The corpus-verification finding does not establish that the committed measurements used incorrect inputs. Fix these issues in Kilo Cloud Previous Review Summaries (3 snapshots, latest commit abcd649)Current summary above is authoritative. Previous snapshots are kept for context only. Previous review (commit abcd649)Status: No Issues Found | Recommendation: Merge Files Reviewed (25 files)
Incremental review of HEAD Static inspection only. Code, tests, builds, browser/CSP checks, and benchmarks were not executed under the read-only restrictions; runtime behavior and reported compression measurements were not independently validated. Previous review (commit 5d82b9f)Status: No Issues Found | Recommendation: Merge Files Reviewed (13 files)
Incremental review of HEAD Previous review (commit 91870a5)Status: 3 Issues Found | Recommendation: Address before merge Overview
Issue Details (click to expand)WARNING
The line-399 defect was independently verified and is already covered by an active review comment; no duplicate was posted. The other two findings were published together in one inline review. Files Reviewed (73 files)
Reviewed current HEAD Reviewed by gpt-6.1-sol · Input: 51 · Output: 10K · Cached: 1.4M |
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Review comments at @src/components/viewer-shell.tsx:
- Line 210: Update the catch handler in the decodeFragmentInBrowser promise
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AGENTS.mdCHANGELOG.mdREADME.mddocs/architecture.mddocs/arx6-research.mddocs/dependency-notes.mddocs/deployment.mddocs/payload-format.mddocs/testing.mddocs/url-fragments.mdexperiments/arx6/README.mdexperiments/arx6/bench.mtsexperiments/arx6/check.d.mtsexperiments/arx6/check.mjsexperiments/arx6/compare.mjsexperiments/arx6/corpora/capacity-manifest.jsonexperiments/arx6/corpora/capacity-validation.jsonexperiments/arx6/corpora/diagnostic.jsonexperiments/arx6/corpora/manifest.jsonexperiments/arx6/corpora/natural-manifest.jsonexperiments/arx6/corpora/timing-manifest.jsonexperiments/arx6/corpora/validation.jsonexperiments/arx6/evaluate.mjsexperiments/arx6/external-corpus.mjsexperiments/arx6/external-manifest.jsonexperiments/arx6/external-plan.jsonexperiments/arx6/external-quality.jsonexperiments/arx6/generate-capacity-corpus.mjsexperiments/arx6/generate-corpus.mjsexperiments/arx6/model-ablation.mjsexperiments/arx6/model-candidates.mjsexperiments/arx6/rebuild-natural-corpus.mjsexperiments/arx6/replay.mjsexperiments/arx6/results/consolidated-capacity.jsonexperiments/arx6/results/consolidated-diagnostic.jsonexperiments/arx6/results/consolidated-external.jsonexperiments/arx6/results/consolidated-natural.jsonexperiments/arx6/results/consolidated-replay.jsonexperiments/arx6/results/consolidated-timing-optimized.jsonexperiments/arx6/results/consolidated-timing-original.jsonexperiments/arx6/results/consolidated-validation.jsonexperiments/arx6/results/model-ablations.jsonexperiments/arx6/results/research-freeze.jsonexperiments/arx6/results/research-holdout-summary.jsonexperiments/arx6/results/timing-summary.jsonexperiments/arx6/runtime.d.mtsexperiments/arx6/runtime.mjsexperiments/arx6/src/arx6-core.d.mtsexperiments/arx6/src/arx6-core.mjsexperiments/arx6/src/cm6.mjsexperiments/arx6/src/native-frame.mjsexperiments/arx6/summarize-timing.mjsexperiments/arx6/timing-corpus.mjsscripts/csp-smoke.mjsskills/agent-render-linking/SKILL.mdskills/selfhosted-agent-render/SKILL.mdsrc/components/generated-link.tsxsrc/components/home/link-creator.tsxsrc/components/viewer-shell.tsxsrc/components/viewer/artifact-editor.tsxsrc/lib/payload/arx-codec.tssrc/lib/payload/arx4-codec.tssrc/lib/payload/arx6-bytes.tssrc/lib/payload/arx6-codec.tssrc/lib/payload/arx6-model.tssrc/lib/payload/arx6-v2-model.tssrc/lib/payload/browser-codec.tssrc/lib/payload/codec-worker-protocol.tssrc/lib/payload/codec.worker.tssrc/lib/payload/fragment-arx.tssrc/lib/payload/fragment.tssrc/lib/payload/link-creator.tssrc/lib/payload/schema.tstests/arx-codec.test.tstests/arx-radix-equivalence.test.tstests/arx4-dictionary-pin-guard.test.tstests/arx5-codec.test.tstests/arx5-markdown-link-fuzz.test.tstests/arx6-adversarial.test.tstests/arx6-codec.test.tstests/arx6-core.test.tstests/arx6-prior-fetch.test.tstests/arx6-selection.test.tstests/browser-codec.test.tstests/compact-header.test.tstests/components/artifact-editor.test.tsxtests/components/link-creator.test.tsxtests/components/viewer-shell-artifact-select.test.tsxtests/e2e/arx4-determinism.spec.tstests/e2e/arx6-determinism.spec.tstests/e2e/payload-worker.spec.tstests/fixtures/arx-radix-wire-goldens.jsontests/link-creator-encode-once.test.tstests/link-creator.test.ts
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Review comments at @docs/payload-format.md:
- Line 23: Update the embedded examples in the payload examples module so they
describe ARX6 v3 links using #g3, retain frozen decoding for #g2 and unversioned
links, and state that ARX6 is automatically selected only when it strictly
improves on the existing choice. Update the manifest’s codec list and preferred
codec accordingly, replacing the ARX5 auto-emission claims.
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AGENTS.mdCHANGELOG.mdREADME.mddocs/architecture.mddocs/arx6-research.mddocs/deployment.mddocs/payload-format.mddocs/testing.mddocs/url-fragments.mdscripts/csp-smoke.mjsskills/agent-render-linking/SKILL.mdskills/selfhosted-agent-render/SKILL.mdsrc/components/home/link-creator.tsxsrc/components/viewer-shell.tsxsrc/lib/payload/arx-codec.tssrc/lib/payload/arx4-codec.tssrc/lib/payload/arx6-bytes.tssrc/lib/payload/arx6-codec.tssrc/lib/payload/arx6-v3-model.tssrc/lib/payload/fragment-arx.tssrc/lib/payload/fragment.tssrc/lib/payload/schema.tstests/arx-transport-dominance.test.tstests/arx4-dictionary-pin-guard.test.tstests/arx6-adversarial.test.tstests/arx6-codec.test.tstests/arx6-prior-fetch.test.tstests/components/link-creator.test.tsxtests/components/viewer-shell-creator-navigation.test.tsxtests/e2e/arx6-determinism.spec.tstests/link-creator-encode-once.test.ts
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- docs/testing.md
- src/lib/payload/arx6-bytes.ts
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| ``` | ||
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| The compact fragment is a single codec tag char followed by the payload. The tag encodes the codec so unsupported formats fail cleanly; the compact tag does not carry a dictionary version — arx-family tags imply the build's current dictionary (the build pins the newest supported version and rejects a newer one). The legacy `#agent-render=v1.<codec>.<payload>` form (arx-family carry an extra `<dictVersion>.` segment) still decodes for back-compatibility but is no longer emitted. Fragment URLs can look long because they carry the artifact payload in the browser-only fragment instead of sending it to the host during the page request. | ||
| The compact fragment starts with a single codec tag. ARX through ARX5 compact tags imply their pinned dictionary/model. New ARX6 links identify model version 3 with `#g3<prior><digits>`. Existing `#g2<prior><digits>` and original `#g<prior><fraction>` links remain readable through their frozen decoders. The separate experimental `#g1L` format is not accepted by the viewer. Legacy `#agent-render=v1.<codec>.<payload>` links (ARX through ARX5 carry an extra `<dictVersion>.` segment) remain readable but are no longer emitted. Fragments carry the artifact in the browser instead of sending it to the host with the page request. |
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🗄️ Data Integrity & Integration | 🟡 Minor | ⚡ Quick win
🔎 Supported by static analysis
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Update the embedded ARX example for ARX6 v3.
The example in src/lib/payload/examples.ts still says ARX5 is auto-emitted. Its manifest lists codecs only through ARX5 and sets arx5 as preferred. Update these embedded examples to describe #g3, frozen #g2 and unversioned decoding, and the strict-improvement rule for automatic ARX6 selection. The linking and self-hosted skills already document the new contract.
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Review comment at @docs/payload-format.md at line 23:
Update the embedded examples in the payload examples module so they describe
ARX6 v3 links using #g3, retain frozen decoding for #g2 and unversioned links,
and state that ARX6 is automatically selected only when it strictly improves on
the existing choice. Update the manifest’s codec list and preferred codec
accordingly, replacing the ARX5 auto-emission claims.
After applying the fix, consider running `coderabbit review --agent` for local
review. Visit https://docs.coderabbit.ai/cli?utm_source=ghpr
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| for (const previous of reference) { | ||
| const row = map.get(previous.id); | ||
| assert.ok(row && previous.roundTrip); | ||
| assert.equal(row.decodedJsonChars, previous.decodedJsonChars); |
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WARNING: Bind historical replay comparisons to the frozen corpus
The verify branch never checks the measured report's corpusSha256 against the expected 227-input union. For the 200 historical inputs, this comparison checks IDs and normalized JSON lengths, while exact candidate-wire checks cover only the fresh 27 inputs and the legacy hash assertion runs only on length ties. A report remeasured after replacing a historical entropy body with same-length repetitive text is therefore not rejected when its wire becomes shorter, and the resulting saving is compared against a different baseline input. The earlier build checks do not bind the separately supplied verification report. Validate its corpus digest against the frozen union, or verify per-envelope content hashes, before assembling these totals.
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| ```sh | ||
| node experiments/arx6/extra-pass-replay.mjs build \ | ||
| /tmp/arx6-final-replay.json /tmp/arx6-extra-pass-validation.json \ |
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WARNING: Build the previous replay corpus before consuming it
On a clean /tmp, following the reproduction commands in order fails here with ENOENT: /tmp/arx6-final-replay.json has not been created. Its producing command, replay.mjs build, appears later at lines 209-211 and also requires the timing corpus generated at line 196. extra-pass-replay.mjs immediately reads this input at line 18, so the new g3 replay cannot start. Move this block after the prerequisite reconstruction, or explicitly direct readers to complete that reconstruction first.
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2 participants
Combines #117 and #121 into production ARX6 with frozen model version 3, preserving original ARX6 and
g2links. New links use#g3<prior><digits>; the version is unrelated to the deprecated ARX3 codec. The #117 prototype remains archived and byte-identical.Resulting behavior
Compression evidence
Every measurement counts the complete URL-serialized
[View](url)link and checks exact normalized schema/UTF-16 round trips with production Brotli WASM.The extra-pass model and selection policy were frozen before evaluating 27 fresh artifacts from eight additional repositories: Markdown, code, whole JSON, CSV, real commit diffs, and Chinese/Spanish prose. G3 uses 45,006 characters versus g2's 45,425: 0.92% shorter, with 22 wins, two same-length ties, and three losses of 1–3 characters. Every artifact-kind aggregate improves. Link-budget fit counts remain 18/27 at 2,000 characters and 27/27 at 8,192. Against original main, this cohort is 16.81% shorter with 27/27 wins.
A separate 227-case integration replay passes every round trip and reproduces all 27 frozen validation wires exactly. The previous 198 inputs are diagnostic in this pass; their g3 aggregate savings versus original main are 17.79% / 17.97% / 17.56% / 8.45% / 16.74% for generated diagnostics, generated validation, dependency snippets, capacity cases, and external sources. Every legacy-relative tie retains its exact wire. Compared with g2, the 64k entropy case grows 54 characters and the near-200k entropy boundary grows 156; these links remain unshareable.
Against #121 auto, g3 saves 7.57% / 7.74% / 4.00% / 3.87% / 3.81% across those five old cohorts. G3 is shorter than #117's standalone prototype on every comparable case. The prototype's 11 capacity declines remain explicit, without partial-total claims. The original g2 consolidation's six-lane comparisons are retained separately. Corpus manifests, hashes, reconstruction commands, and rejected experiments are committed. Broader prior search, alternate framing, transforms, and snapshot caching were measured and excluded where gains did not justify CPU, memory, regressions, or protocol complexity. No third-party corpus text is republished.
These are named software-text cohorts, not representative agent traffic or a universal saving. No model tuning used the fresh validation results.
Validation and cost
abcd649. Final commit080950eincludes the research archive/documentation, benchmark integrity checks, and removal of a no-op research-generator replacement. All nine generated candidate hashes remain unchanged. Its CI rerun is pending; application code is unchanged from the fully passing implementation commit.A separate quiet, ordered 78-input run measures the final model and transport pruning together:
The stronger model adds typical CPU cost despite skipping losing transport conversions. Each g3 model allocates 54.50 MiB of typed arrays, 4.05 MiB more than g2. All 156 timing wires match their reference runs. These are single ordered measurements on one four-CPU Linux/Node host, not repeated statistical or mobile-device guarantees; no measured encode exceeded the Worker's 60-second deadline.
CRC32 detects accidental corruption, not forgery. Real Discord/WhatsApp paste/click behavior is not established by browser tests.
See consolidated findings and reproduction instructions.