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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. 🧰 Additional context used📚 Code guidelines (1)📝 WalkthroughWalkthroughThis change adds the ARX6 payload codec, registers its ChangesARX6 Transport
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant LinkCreator
participant FragmentEncoder
participant ARX6Codec
participant ARX5Codec
LinkCreator->>FragmentEncoder: Request asynchronous encoding
FragmentEncoder->>ARX6Codec: Build ARX6 candidate
ARX6Codec-->>FragmentEncoder: Return candidate or no candidate
alt ARX6 candidate fits the effective budget
FragmentEncoder-->>LinkCreator: Return ARX6 fragment
else ARX6 declines or candidate does not fit
FragmentEncoder->>ARX5Codec: Build ARX5 fallback candidate
ARX5Codec-->>FragmentEncoder: Return fallback candidate
FragmentEncoder-->>LinkCreator: Return selected fragment
end
Merge Risk: 🔵 Low · up to ARX6 becomes the default link codec, and ARX5 remains the fallback. The remaining open item in this review is documentation that does not fully describe when ARX5 runs. It can be fixed with a small text edit. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to New links use a new format while older links remain readable. The inspected validation and rendering controls are preserved. Remaining uncertainty concerns deployment compatibility and behavior outside the inspected sharing path. Retained concerns Security review detailsSecurity Blast Radius
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 70.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 60 functions across 18 files. (9 skipped: 9 unsupported.)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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| } | ||
| for (const index of BODY_INDEXES_BY_KIND_CODE.get(artifact[0]) ?? []) { | ||
| const body = artifact[index]; | ||
| if (typeof body !== "string") continue; |
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WARNING: Clear non-string diff bodies before reusing their slots as lengths
Skipping a non-string body leaves its original value in the tuple, but rawContainerToEnvelope treats every non-null body slot as a length. For example, {id: "p", kind: "diff", patch: 1, oldContent: "ab", newContent: "cd"} is accepted by the existing runtime guard and normalizer because the old/new pair is valid. Explicit arx6 encoding produces abcd\n[3,["d","p",1,2,-1]], which decodes successfully as patch: "a", oldContent: "bc", newContent: "d". This can corrupt an untouched diff when a user edits another artifact in a plain/deflate bundle and reshares it with arx6. The previous tuple decoder discarded the non-string optional patch without shifting either content body. Reject or clear non-string body fields before emitting the length tuple.
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| - `arx4` - **deprecated emit.** ARX2's tuple/overlay pipeline with Brotli replaced by the deterministic context mixer, plus a prior id char, but it kept arx3's broken visible-length baseBMP policy. Existing `#e` links still decode. Do not mint new arx4 links. | ||
| - `arx5` - ARX 4.5: the sane mixer codec. Same context mixer, priors, and wire shapes as arx4 (`arx4-codec.ts`), scored with ARX2's honest serialized transport length for every wire including baseBMP. The compact `f` tag identifies arx5. The payload still carries one extra leading char, the prior id (`m`, `c`, `j`, `s`, or `n`); `m`/`c`/`j` need `/arx4-priors.json` (pre-compressed `/arx4-priors.json.br` tried first). If the asset is unavailable the encoder falls back to `s`. Auto-selection prefers arx5, then arx2. It is roughly 100x slower than Brotli, which is why the whole arx family is async-only. | ||
| - `arx5` - ARX 4.5: the sane mixer codec. Same context mixer, priors, and wire shapes as arx4 (`arx4-codec.ts`), scored with ARX2's honest serialized transport length for every wire including baseBMP. The compact `f` tag identifies arx5. The payload still carries one extra leading char, the prior id (`m`, `c`, `j`, `s`, or `n`); `m`/`c`/`j` need `/arx4-priors.json` (pre-compressed `/arx4-priors.json.br` tried first). If the asset is unavailable the encoder falls back to `s`. Auto-selection uses arx5 only for envelopes arx6 declines. It is roughly 100x slower than Brotli, which is why the whole arx family is async-only. | ||
| - `arx6` - the emitted mixer codec. Same prior ids and curated corpora as arx5, with its own context mixer (`arx6-model.ts`: arx5's model plus a line-type context, run and deterministic-slot inputs, a two-layer mixer, and an adaptive probability map chain) coding the raw container described under the tuple fields below instead of substituted tuple JSON. Each curated prior id primes on the dictionary text, the first half of a second curated block (json for `m`, markdown for `c` and `j`), then its own block. The wire reads the fragment digits as one base-66 fraction over `0-9A-Za-z-._~`, so a fragment is `g` + prior id + digits, with no length marker and no `B.` marker; the encoder picks the fewest digits that land inside the arithmetic coder's final interval. The last digit is always alphanumeric, because linkifiers strip a trailing `.`, `~`, `-`, or `_`. About 14% shorter than arx5 on a held-out corpus of 214 real artifacts from the maintainer's repositories (shorter on every artifact in that corpus; the corpus is not committed), at roughly 3x arx5's coding time. Auto-selection skips arx5 once arx6 fits the fragment budget, so for unusual high-entropy text auto can return an arx6 link slightly longer than arx5 would have been. An artifact body holding a lone surrogate cannot survive UTF-8, so arx6 declines that envelope and auto-selection falls back to arx5. Auto-selection prefers arx6, then arx2. |
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WARNING: Specify the mixed-radix fraction used by the actual wire
The implementation does not interpret these digits as an ordinary base-66 fraction with a restricted final digit. fractionDenominator and fractionDigitsToBytes use base 62 for the final position: for an n-digit wire, base-66 prefix value P, and final digit d, the fraction is (62 * P + d) / (62 * 66^(n - 1)), not (66 * P + d) / 66^n. These values differ whenever d is nonzero, so an external decoder following the documented protocol reconstructs a different arithmetic code for valid links. Document the mixed-radix formula here and in the matching protocol descriptions without changing the already-pinned implementation.
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| return (count) => { | ||
| spent += count; | ||
| if (spent > MAX_DECODED_PAYLOAD_LENGTH) { | ||
| throw new Error("A restored arx6 diff patch exceeds the decoded payload budget."); |
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SUGGESTION: Preserve the decoded-too-large error classification on restoration
The oversized restoration case already present in tests/arx6-codec.test.ts (a 1,000-character path and 300 elided --- headers) reaches this limit. Throwing a generic Error makes decodeFragmentAsync return invalid-json with a dictionary-version hint instead of the existing decoded-too-large result and size-limit message. Throw ArxDecodedPayloadTooLargeError here, as the other decoding budget guards do, so callers and the viewer receive the actual failure reason. The current test only checks ok === false and does not catch this error-code mismatch.
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Code Review SummaryStatus: 3 Issues Found | Recommendation: Address before merge Overview
Issue Details (click to expand)WARNING
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- 🪄 Fix CodeRabbit comments on this PR
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Review comments at @docs/architecture.md:
- Line 100: Update the codec-selection documentation to describe both conditions
for arx5 fallback: at docs/architecture.md lines 100-100 and
docs/payload-format.md lines 126-126, say arx5 runs when arx6 declines the
envelope or misses the fragment budget; at docs/payload-format.md lines 35-35,
remove the final sentence that lists only arx6 and arx2 as auto-selection
preferences.
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📒 Files selected for processing (27)
AGENTS.mdCHANGELOG.mdREADME.mddocs/architecture.mddocs/dependency-notes.mddocs/payload-format.mddocs/url-fragments.mdskills/agent-render-linking/SKILL.mdskills/selfhosted-agent-render/SKILL.mdsrc/components/generated-link.tsxsrc/lib/payload/arx-codec.tssrc/lib/payload/arx4-codec.tssrc/lib/payload/arx6-codec.tssrc/lib/payload/arx6-model.tssrc/lib/payload/fragment-arx.tssrc/lib/payload/fragment.tssrc/lib/payload/schema.tstests/arx-codec.test.tstests/arx4-dictionary-pin-guard.test.tstests/arx5-codec.test.tstests/arx5-markdown-link-fuzz.test.tstests/arx6-codec.test.tstests/compact-header.test.tstests/components/link-creator.test.tsxtests/e2e/arx4-determinism.spec.tstests/link-creator-encode-once.test.tstests/link-creator.test.ts
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| - `arx6` is the emitted mixer codec. It uses the same prior ids and curated corpora as arx5 (each id also primes on half of a second curated block) and runs a stronger context mixer (`arx6-model.ts`) over a raw container: the bodies verbatim, a newline, then the arx2 tuple JSON with each artifact body swapped for its length, with no JSON escaping and no overlay or dictionary substitution. The wire reads the payload digits (`0-9A-Za-z-._~`, last digit alphanumeric) as one base-66 fraction, the shortest that lands in the arithmetic coder's final interval, emitted with the compact `g` tag. A truncated link garbles the tuple at the end of the container and fails to decode. Envelopes with a lone surrogate in a body cannot survive UTF-8, so arx6 declines them and arx5 codes them instead. | ||
| - packed wire mode (`p: 1`) shortens transport keys before compression, then unpacks back to the standard envelope during decode | ||
| - automatic async codec selection tries `arx5 -> arx2 -> arx -> deflate -> lz -> plain`; arx compares packed + non-packed candidates, while arx2/arx5 use tuple envelopes. Explicit `{ codec: "arx3" }` or `{ codec: "arx4" }` still encodes for back-compat. | ||
| - automatic async codec selection tries `arx6 -> arx5 -> arx2 -> arx -> deflate -> lz -> plain`, where arx5 only runs when arx6 declines the envelope, since each mixer pass is the slowest step of link creation; arx compares packed + non-packed candidates, while arx2/arx5/arx6 use tuple envelopes. Explicit `{ codec: "arx3" }` or `{ codec: "arx4" }` still encodes for back-compat. |
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📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win
Make the docs describe when arx5 runs the same way. buildCandidatesAsync in src/lib/payload/fragment.ts runs arx5 in two cases. The first case is when arx6 declines the envelope (a lone surrogate in a body). The second case is when the arx6 candidate's transportLength exceeds min(targetMaxFragmentLength ?? MAX_FRAGMENT_LENGTH, MAX_FRAGMENT_LENGTH). CHANGELOG.md states both cases. These doc sites state only the first case, or leave arx5 out of the priority order.
docs/architecture.md#L100-L100: change "arx5 only runs when arx6 declines the envelope" to "arx5 only runs when arx6 declines the envelope or misses the fragment budget".docs/payload-format.md#L126-L126: make the same change to the default async priority line.docs/payload-format.md#L35-L35: remove the last sentence "Auto-selection prefers arx6, then arx2.", because it leaves out arx5.
As per path instructions: verify alignment across README.md, docs/architecture.md, docs/payload-format.md, docs/deployment.md, docs/dependency-notes.md, docs/testing.md, and skills/agent-render-linking/SKILL.md.
📍 Affects 2 files
docs/architecture.md#L100-L100(this comment)docs/payload-format.md#L126-L126docs/payload-format.md#L35-L35
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Review comment at @docs/architecture.md at line 100:
Update the codec-selection documentation to describe both conditions for arx5
fallback: at docs/architecture.md lines 100-100 and docs/payload-format.md lines
126-126, say arx5 runs when arx6 declines the envelope or misses the fragment
budget; at docs/payload-format.md lines 35-35, remove the final sentence that
lists only arx6 and arx2 as auto-selection preferences.
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| const budget = Math.min(options.targetMaxFragmentLength ?? MAX_FRAGMENT_LENGTH, MAX_FRAGMENT_LENGTH); | ||
| const arx6Fits = candidates.some((candidate) => candidate.codec === "arx6" && candidate.transportLength <= budget); | ||
| if (!arx6Fits) { | ||
| candidates.push(...await buildArx5Candidates(envelope)); |
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When arx6 fits the 8,192-character fragment budget, this skips arx5 even if arx5 would make a shorter link. For high-entropy artifacts near Discord’s 2,000-character message limit, link creation can therefore warn that the selected markdown link is too long without trying an arx5 link that would fit. The Discord warning is calculated only after the candidates have been selected.
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| this.table[this.index] += (target - this.table[this.index]) >> APM_RATE; | ||
| } | ||
| } |
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The new default model allocates roughly 45 MB of typed-array storage for each coding pass, even for a tiny artifact. Encoding and decoding each construct a fresh model, so this raises memory pressure on constrained browsers. Allocating less-used tables on demand would reduce that cost.
1 participant
Problem
Every new agent-render link is an
arx5fragment, and the 2,000-character Discord link limit decides how much of an artifact fits. Two things in the arx5 pipeline waste that budget:\n, every quote is\", and common words are swapped for control bytes. Its priming corpora are raw text, so their statistics barely transfer, and the CSV column model never sees a real newline.B.marker, and a length prefix.Change
Adds
arx6(compact tagg) and makes it the auto-emitted codec.#eand#flinks decode exactly as before (arx4-codec.tscoding is untouched), and arx5 still codes anything arx6 declines.src/lib/payload/arx6-model.ts), all standard lpaq1/paq8 structure, integer-only so encode stays bit-identical across engines:0-9A-Za-z-._~are read as one base-66 fraction landing in the arithmetic coder's final interval. That absorbs the flush, the length marker, andB.. The last digit is always alphanumeric, so linkifiers never strip it.diff --git/---/+++lines and hunk-header counts derivable from the hunk body are elided under kind codeD, only when the exact inverse reproduces the patch; anything else stays verbatim underd.Before / after
Shipped
arx5vs this branch'sarx6, honest transport length (what a chat client sees), on a held-out set of 214 real artifacts from the maintainer's repositories. Every design choice was made on a separate 229-artifact dev set; the held-out set was never used to choose anything. "Fit Discord" counts fragments of at most 1,960 chars, which leaves room for[label](https://agent-render.com/#...)under 2,000.Repo sample fixtures (in-genre):
Dev set (229 artifacts): 343,550 to 294,981 chars, -14.1%, arx6 shorter on 229/229, Discord fits 168 to 188.
Cost: arx6 codes at roughly 3x arx5's time, mostly from priming the stronger model on about 23 KB of corpus (Node, best of 5, on a desktop under load):
Notes
#gis frozen once this ships. Golden fragments for every prior id are pinned intests/arx6-codec.test.ts, and the Node-vs-browser determinism e2e covers an arx6 draft.Produced with Claude Code (Claude Opus 5.5), with parallel subagents for the research lanes, the port, and an adversarial review.
🤖 Generated with Claude Code
Note
Medium Risk
Changes the default fragment encoding path and ships a frozen wire format for all new
#glinks, though decode stays fail-closed and older codecs remain supported.Overview
Introduces
arx6(compact tagg) as the default codec for new fragment links, witharx5kept as fallback whenarx6cannot encode an envelope or does not fit the fragment budget. Existing#f/#elinks still decode unchanged.arx6codes a raw container (artifact bodies verbatim, newline, then tuple JSON with body fields replaced by lengths—no dictionary substitution or JSON escaping in the bodies) through a stronger integer context mixer inarx6-model.ts, then emits a base-66 fraction wire over chat-safe0-9A-Za-z-._~(prior idm/c/j/s/nlikearx5). Truncated#glinks fail decode because the tuple sits at the end; optional diff patch elision (Dkind) shrinks patches only when restore is exact.Wiring:
schema.tsregisters the codec;fragment.ts/fragment-arx.tsdecodearx6, build candidates, and skip a redundantarx5pass whenarx6already fits budget;arx-codec.ts/arx4-codec.tsexport tuple and prior helpersarx6reuses. Docs, agent skills, link-creator UI copy, and tests (including golden#gvectors and auto-selection expectations) are updated to match.Reviewed by Cursor Bugbot for commit 431ba6d. Configure here.
Summary by CodeRabbit
#gfragment tag. Automatic encoding now prefers ARX6 and falls back to ARX5 when ARX6 cannot encode the content or fit within the link limit.#flinks continue to decode. Truncated ARX6 links fail to decode.