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The chat UI vertical: one rendering of an agent session #65

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mph merged 54 commits from cc-chat into main 2026-08-24 09:49:00 +00:00
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mph commented 2026-08-24 09:31:37 +00:00
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The chat UI vertical: one rendering of an agent session, shared by every house project.

Two effort-local slices, reviewed and shipped as one branch — 51 commits, 4 644 insertions
across 44 files outside project-management/.

What this delivers

A ui module that turns a Claude Code session into a semantic cc-* HTML vocabulary, a
default stylesheet that is the whole appearance of a transcript, and a demo host that makes
both readable against a real local archive. A consumer embeds <cc-chat session="…">, links
cc-chat.css, and ships — or drops the sheet and writes its own against the same tags.

Slice 01 — transcript viewer

Goal: point the viewer at one of my own archived sessions and read that conversation in
the browser — my turns, the agent's turns, and what the agent did — accurately enough that I
use it instead of reading the raw JSONL.

Fit test: open a real session and read it. Nothing I know happened is missing; nothing
foreign is present; "what happened in this session?" is answered correctly. Passed on
Michal's read.

Delivered: the vendor-neutral transcript model and its wire codec (cross-built); the ui
module and its place in build.mill; the Claude Code adapter, shaped against a measurement of
the local archive; the history endpoint and its refusals; the <cc-chat> element;
bundle-from-jar delivery with a CI size gate; the demo host; and the deletion of the uispike
prototype — the card forbids two generations coexisting.

Slice 02 — transcript presentation

Goal: read a long, dense session end to end — markdown as markdown, no scaffolding I never
typed, tool calls as structure, a picture as a picture — and change how the whole thing looks
from the host page alone, by editing one stylesheet, without touching or forking the element.

Fit test: open a compacted session with many tool calls, read it end to end, then restyle
it. Passed on Michal's read — "we can keep it like this".

Delivered, each step measured before it was built:

  • The vocabulary, declared and emitted with every inline style gone. Markup describes the
    tree; TranscriptMarkup is the vocabulary; cc-chat.css ships beside the bundle.
  • Prose as prose. A message carries Prose, read from markdown once on the JVM. Only the
    transcript package can make one, so "prose HTML is ours or it is not inserted" is held by
    construction, not by discipline.
  • Scaffolding off every activity body — 0 complete wrapper elements and 0 ANSI sequences
    left on a real 249-row session.
  • Tool calls as structure, and an answer joined to its call by a shared token — 4.8 % of
    answers in the archive sit away from their call, so adjacency was not enough.
  • Artifacts: a picture is fetched from the host that served the page, never inserted; a file
    is its path.
  • CC-D3 — one producer, on the JVM. The element fetches rendered markup instead of
    rendering it. The bundle went from 185 543 bytes gzipped to 12 621, with the model, the
    codec and Laminar all out of the browser.
  • Time is what passed, not a label on every row. Across four real sessions 93–99 % of the
    wall-clock sits in a handful of pauses, so the page marks the pauses and the days instead of
    printing a clock 179 times for 24 distinct values.
  • A run folds the machinery between two turns — 161 of 203 rows on a real session — and says
    what is inside it: 9 tool calls · 55s · Bash 5, Read 4.
  • The polish pass: every row that opens says so, no control opens onto nothing, and the page
    keeps its rhythm whatever display a host gives the transcript.

Review

Eight reviewers over the whole batch — style, testing, security, scala3, composition,
architecture, api, zio. No critical findings. Eight of ten warnings fixed in loop, two
parked with their reason. Full report:
project-management/efforts/cc-chat/slices/02-transcript-presentation/review-slice-20260824-093349.md.

The two that mattered:

  • A markdown link could carry its own bytes into the host document. CommonMark's default URL
    sanitizer allows data: beside http/https/mailto, so [open](data:text/html;base64,…)
    rendered a clickable data: href into a document that reads mail — against the card's own
    invariant that an artifact is a reference and never bytes. Two tests written first, both
    failed, both pass.
  • CC-D3 was held by omission rather than by the compiler. The producer cross-compiled into
    ui.js, where a second producer could have been written in the one module with no tests. It
    is JVM-only now; ui/shared/src holds the wire contract and nothing else.

Follow-ups (parked, not blocking)

  • ui.js has no test module, so TranscriptElement has never been tested. The property it
    is trusted to hold — a session id can never become markup — is asserted only in prose. The
    fix is infrastructure (jsdom-backed Scala.js tests), which is why it was deferred.
  • TranscriptApi.markup's error output cannot be decoded back into a TranscriptFailure.
    Deferred as a judgement: both available fixes are worse than the documented limitation.
  • A malformed part on the artifact endpoint bypasses the JSON error envelope.
  • The demo host interpolates the session id into HTML — safe by an allow list, not by
    construction.
  • Nothing recommends a CSP to a host embedding <cc-chat>.
  • The demo host swallows a bind failure; Netty sets no SO_REUSEADDR, so a restart inside
    the TIME_WAIT window fails silently.
  • Sub-agent transcripts are a second source nobody reads — 26.6 % of archive entries.

The rest of the parked list is flushed into project-management/efforts/cc-chat/map.md.

Gate

./mill __.test — 823/823 green. ./mill __.checkFormat — clean. Bundle 12 621 bytes
gzipped against the CI limit of 15 000.

No real transcript enters this repo. Every fixture is synthetic; real sessions are read at
runtime only, from the local machine.

🤖 Generated with Claude Code

https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww

The chat UI vertical: one rendering of an agent session, shared by every house project. Two effort-local slices, reviewed and shipped as one branch — 51 commits, 4 644 insertions across 44 files outside `project-management/`. ## What this delivers A `ui` module that turns a Claude Code session into a semantic `cc-*` HTML vocabulary, a default stylesheet that is the whole appearance of a transcript, and a demo host that makes both readable against a real local archive. A consumer embeds `<cc-chat session="…">`, links `cc-chat.css`, and ships — or drops the sheet and writes its own against the same tags. ## Slice 01 — transcript viewer **Goal:** point the viewer at one of my own archived sessions and read that conversation in the browser — my turns, the agent's turns, and what the agent did — accurately enough that I use it instead of reading the raw JSONL. **Fit test:** open a real session and read it. Nothing I know happened is missing; nothing foreign is present; "what happened in this session?" is answered correctly. **Passed on Michal's read.** Delivered: the vendor-neutral transcript model and its wire codec (cross-built); the `ui` module and its place in `build.mill`; the Claude Code adapter, shaped against a measurement of the local archive; the history endpoint and its refusals; the `<cc-chat>` element; bundle-from-jar delivery with a CI size gate; the demo host; and the deletion of the `uispike` prototype — the card forbids two generations coexisting. ## Slice 02 — transcript presentation **Goal:** read a long, dense session end to end — markdown as markdown, no scaffolding I never typed, tool calls as structure, a picture as a picture — and change how the whole thing looks from the host page alone, by editing one stylesheet, without touching or forking the element. **Fit test:** open a compacted session with many tool calls, read it end to end, then restyle it. **Passed on Michal's read** — "we can keep it like this". Delivered, each step measured before it was built: - **The vocabulary**, declared and emitted with every inline style gone. `Markup` describes the tree; `TranscriptMarkup` is the vocabulary; `cc-chat.css` ships beside the bundle. - **Prose as prose.** A message carries `Prose`, read from markdown once on the JVM. Only the transcript package can make one, so "prose HTML is ours or it is not inserted" is held by construction, not by discipline. - **Scaffolding off every activity body** — 0 complete wrapper elements and 0 ANSI sequences left on a real 249-row session. - **Tool calls as structure**, and an answer joined to its call by a shared token — 4.8 % of answers in the archive sit away from their call, so adjacency was not enough. - **Artifacts**: a picture is fetched from the host that served the page, never inserted; a file is its path. - **CC-D3 — one producer, on the JVM.** The element fetches rendered markup instead of rendering it. The bundle went from 185 543 bytes gzipped to **12 621**, with the model, the codec and Laminar all out of the browser. - **Time is what passed, not a label on every row.** Across four real sessions 93–99 % of the wall-clock sits in a handful of pauses, so the page marks the pauses and the days instead of printing a clock 179 times for 24 distinct values. - **A run** folds the machinery between two turns — 161 of 203 rows on a real session — and says what is inside it: `9 tool calls · 55s · Bash 5, Read 4`. - **The polish pass**: every row that opens says so, no control opens onto nothing, and the page keeps its rhythm whatever display a host gives the transcript. ## Review Eight reviewers over the whole batch — style, testing, security, scala3, composition, architecture, api, zio. **No critical findings.** Eight of ten warnings fixed in loop, two parked with their reason. Full report: `project-management/efforts/cc-chat/slices/02-transcript-presentation/review-slice-20260824-093349.md`. The two that mattered: - **A markdown link could carry its own bytes into the host document.** CommonMark's default URL sanitizer allows `data:` beside http/https/mailto, so `[open](data:text/html;base64,…)` rendered a clickable `data:` href into a document that reads mail — against the card's own invariant that an artifact is a reference and never bytes. Two tests written first, both failed, both pass. - **CC-D3 was held by omission rather than by the compiler.** The producer cross-compiled into `ui.js`, where a second producer could have been written in the one module with no tests. It is JVM-only now; `ui/shared/src` holds the wire contract and nothing else. ## Follow-ups (parked, not blocking) - [ ] `ui.js` has no test module, so `TranscriptElement` has never been tested. The property it is trusted to hold — a session id can never become markup — is asserted only in prose. The fix is infrastructure (jsdom-backed Scala.js tests), which is why it was deferred. - [ ] `TranscriptApi.markup`'s error output cannot be decoded back into a `TranscriptFailure`. Deferred as a judgement: both available fixes are worse than the documented limitation. - [ ] A malformed `part` on the artifact endpoint bypasses the JSON error envelope. - [ ] The demo host interpolates the session id into HTML — safe by an allow list, not by construction. - [ ] Nothing recommends a CSP to a host embedding `<cc-chat>`. - [ ] The demo host swallows a bind failure; Netty sets no `SO_REUSEADDR`, so a restart inside the `TIME_WAIT` window fails silently. - [ ] Sub-agent transcripts are a second source nobody reads — 26.6 % of archive entries. The rest of the parked list is flushed into `project-management/efforts/cc-chat/map.md`. ## Gate `./mill __.test` — **823/823 green.** `./mill __.checkFormat` — clean. Bundle 12 621 bytes gzipped against the CI limit of 15 000. **No real transcript enters this repo.** Every fixture is synthetic; real sessions are read at runtime only, from the local machine. 🤖 Generated with [Claude Code](https://claude.com/claude-code) https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
mph added 52 commits 2026-08-24 09:31:37 +00:00 
The element decided how a transcript looked, in inline styles no host rule
could outrank. It now emits semantic cc-* elements and no style at all, so a
stylesheet is the whole appearance.

The vocabulary is described once, as a Markup tree in the shared sources, and
produced from there: MarkupView builds the DOM for it in the browser, and the
JVM renderer will write the same tags as HTML. What a conversation looks like
is decided in TranscriptMarkup and nowhere else.

cc-chat.css ships beside the bundle as an offer, not a decision. Every rule in
it weighs a single tag selector, its qualifiers wrapped in :where(), so one
plain rule of a host's own wins outright.

The archive was measured first: 3278 sessions, 481 329 entries. Activity
outnumbers prose 5:1 and the tail of tool names is unbounded, which is why a
tool is an attribute rather than a tag of its own.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
A transcript is written in markdown by both sides, so a viewer that shows
the characters shows something nobody meant to write. Reading it happens
once, on the JVM, in the adapter — whether messages are markdown is a fact
about an agent tool, not about transcripts.

A message therefore carries Prose rather than characters. Only this package
can make one, and outside it the single way to obtain prose is the markdown
renderer, which escapes everything the transcript wrote. That is how the
card's rule — prose markup is ours or it is not inserted — is held by
construction rather than by care: Markup now has two leaves, and the type of
the second is the reason it can never be what someone wrote.

Two of markdown's outcomes are refused. A link destination that would run
code is dropped by the renderer's sanitizer. An image would fetch bytes from
elsewhere into the host's document, which the card forbids, so it is
rendered as the reference it is.

A tool's output is not writing, and stays the characters it is.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude Code writes into a session in two hands nobody in the conversation
wrote: elements of its own around text it injected, and the control codes a
terminal used to colour a command's output. Scaffolding knows both, and every
activity body is read through it.

A wrapper that names no fields reads as `name: what it held`; one that names
fields leaves only them behind. Naming the fields is what keeps a common word
safe: `status` is a field of a task notification and nothing anywhere else, so
a `<status>` a file happened to contain is left alone. So is any element whose
name is not Claude Code's — another project's prompt vocabulary is writing.

Which elements the tool owns is now known in one place, so recognising a turn
that is only a wrapper and cleaning a body no longer keep separate lists.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
A call arrives as data of whatever shape the tool's own schema takes, and
writing it out as a line lost the one thing that makes a long call readable:
which value belongs to which name. The shape now reaches the page. ToolInput
carries it, a call is its own transcript entry, and the vocabulary gains
cc-tool-call with cc-field, cc-name, cc-value, cc-list and cc-item inside it,
so a host styles a call by the names its own tools use.

The name of a field is on the page twice: as the attribute a host selects by,
and as the text a reader sees, so a page that lost the stylesheet still says
which value belongs to which name.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
A tool result quotes the id of the call it answers, and until now that was
read only to borrow the tool's name for a label. The token itself is now
carried: a call and its answer are two rows sharing one `call` value, so a
host can join them however it wants — the answer under its call, one box
around the pair, or one folded line.

An answer is its own entry rather than one more activity, and says how it
ended as an attribute, so every failure in a session is one selector away.
An answer whose call is not on this page belongs to nothing a reader can
see, and stays plain activity.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
A call left running is answered twice: at once, with a receipt saying it
started, and later — a median of two dozen rows later — with a notification
saying how it ended. The notification names the call it is about, so it is
now read as that call's answer and carries the same token; the whole
exchange stays together however far apart its ends drift.

A notification's fields go deeper than one level, so a wrapper now describes
its fields the same way it is described itself, and a group's fields read one
to a line whatever the tool separated them with. A tally of a sub-agent's
work reads as words instead of as a row of tags.

The answer no longer sits indented under its call. The call says what was
asked and the answer is the quiet half of the pair; a host that wants them
drawn as one block matches on the token they share.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
Work left running reports back in two envelopes: as a turn of the
conversation, and as a command the session put in its queue. Only the first
was read, so in a session that uses the second the answer never reached the
page at all — the call sat there with a receipt and nothing else.

Both envelopes say the same thing about the same call, and which one carried
it is the tool's business rather than the reader's, so both are now read. A
finish that arrives twice is shown once: the turn the conversation already
carries wins, and the queued copy is dropped. Every other attachment stays
what it was — a file that was edited, a listing, a reminder — and is not
read.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
Two more of the tool's own marks: the envelope around an error a tool
returned, and the note that output was too large and went to a file. Neither
name says anything the row does not already say — the row is already labelled
an error, and the note is a sentence — so both are frames: they leave the
words and take their name with them.

That is a third shape beside a field, which keeps its name, and a group,
which leaves its fields.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
Nobody in a conversation writes what a hook says, and it still changes what
happens next: a warning before a command runs, the rules a session was
started with. Until now none of it reached the page, so the turn after a
hook read as arbitrary.

A hook that said something is now a row of its own, carrying the token of the
call it touched when this page holds that call — so a warning about a command
can be read beside it. A hook that ran without a word stays out: that it ran
is bookkeeping, and only what it said changed the session.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
The person's turns were set against the right edge and everything the agent
did was set in from the left, so a reader crossed the page to follow one
conversation. Colour already says who spoke and quieter type already says
which rows are the machinery, so the geometry was saying it a second time.

Every row and every body a row opens onto now starts at the same edge.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
Only a message was held to a readable width, so everything the agent did ran
to the edge of the window and the page had two right-hand edges. Every row
now takes the same measure, and a wide answer scrolls inside its own row
rather than widening the page under everything else.

The measure is no longer written in `ch`. That unit follows each row's own
font, and an activity row is set smaller than a message, so one token would
have landed in two places — 659px inside a message, 565px inside a row.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
The defaults sit in `@layer cc-chat`. A layer is weighed before specificity
and rules in no layer are weighed last, so any plain rule a project writes
wins over anything here, whatever the link order. A project that uses layers
places us with one statement; the header says where a reset wants us.

With the layer deciding, the :where() guards had nothing left to do against a
project, and inside the sheet they only flattened our own rules to source
order. They are gone: a variant now wins because it is more specific.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
A tool result was a string, so a screenshot read as the word "(image)" and
28 746 array-shaped answers were flattened before anyone saw them. A result
is now the parts it came back with — text and pictures, in the order the tool
wrote them — from the parser out to the page.

An artifact crosses the wire as where it sits, never as bytes: a picture is
this call, this part of its answer, and the page fetches it from the host that
served the transcript. Only png, jpeg, gif and webp are served, checked where
an answer is read and again where the bytes are handed over, so the endpoint
cannot be talked into serving whatever a session happens to hold.

A file a call wrote is named and nothing more. The path is the one the call
named in its own input, not the sentence the tool wrote back, so the 1 420
"File created successfully at: …" answers in the archive read as the file
they produced.

Measured over 3 274 sessions: 277 pictures inside tool results, every one
base64 in png or jpeg; Read answers with 151 of them and the browser tools
with the rest, and 126 of those sit among words that are about them.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
MarkupHtml is the second producer of the vocabulary. It walks the Markup that
TranscriptMarkup describes, so the tags, the attributes and the nesting are
decided in one place and emitted twice: as DOM by the element, and as HTML by
whatever server mounts the endpoints. Text a transcript wrote is escaped; only
Prose, which nothing outside the package can make from transcript text, is
written as markup.

ui.demo serves /server?session= beside the element page, under the same
stylesheet and with no script at all. Compared in the browser on a session that
is not being written to, the two cc-transcript trees serialise identically —
158 737 characters, 139 rows, no first difference.

The comparison found a defect nothing else would have: the page template used
stripMargin, which cuts every line at its first `|`, so a server-written page
lost the pipes of every markdown table a transcript quotes.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
A transcript is rendered once, on the JVM, and reaches a page as markup. The
element stops drawing rows from data and will insert what the server rendered;
Laminar keeps what is genuinely stateful, and a row that settles arrives as
markup.

Measured on one 139-row session: JSON 125 217 raw / 37 761 gzipped, the same
page as markup 160 309 / 40 107 — 6% more on the wire, against a bundle of
185 543 gzipped that must arrive before the first row. Payload does not decide
it; the duplication does. Two producers of one vocabulary can only be held
together by a test, and the browser one had no test module at all.

The entry model and its JSON codec stay: the live protocol needs data.

Amends one scope bullet of the slice card, with Michal's approval.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
The writer moves onto scalatags, so escaping and void elements belong to a
library instead of to us; `raw` keeps one call site, fed a Prose, so the card's
prose invariant is still held by construction rather than by care.

A transcript now reaches the browser as markup. `/transcript/markup` answers
with the rendered vocabulary, and answers a refusal in the same vocabulary, so
the element has one thing to do with either: insert what came back. It draws no
row from data, and MarkupView is gone.

The bundle falls from 185 543 bytes gzipped to 12 573 — the model, the codec,
the vocabulary and Laminar all leave the browser.

Measured in the browser: the element page and the server page hold an identical
cc-transcript, 139 rows; a picture still draws from the artifact endpoint; one
stylesheet edit moves both pages alike.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
The browser now places rendered markup and builds no rows, so the bundle is
12 621 bytes gzipped. The gate stood at 256 000, which nothing could reach:
it guarded no classpath. It is 15 000 now — close enough that a dependency
creeping into the cross-built sources breaks the build, as intent.md asks.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
CC-D3's last propagation, ratified by Michal. A new section 7 carries the
decision, the measurements that did not settle it and the one that did, the
four rejected options with their evidence, and the accepted cost. Sections 1
to 5 are corrected: the element places rendered markup, the shared
compilation earns its keep where data crosses the wire, and Laminar is for
what is still moving. The markdown-facade deferral is marked decided --
commonmark on the JVM, no facade -- and the bundle-gate finding now points at
the workflow that carries the number in force.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
Register, reader, positioning, personality, anti-reference and the
accessibility bar, settled with Michal. The reader is a power user who
converses with the agent and dives into the tool calls when something does
not click right; the consumer developer needs structure, not a theme.

Five principles judge the rendering work. The first is the one that binds:
markup on the wire is a promise, so where CSS cannot express what a redesign
needs, the vocabulary names the thing -- bounded by the JSON endpoint and the
transcript model, which are the escape hatch for a consumer whose needs go
past it.

The bar is WCAG AA with no exceptions. Three values in the default sheet do
not hold it today, and the file records them by measurement.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
A reader came for the conversation. On one 203-row session, 161 rows were
machinery and 42 were things said, and the machinery sat in 36 runs between
turns -- median 3 rows, longest 24. Consecutive rows nobody spoke are now one
cc-run, folded, carrying the counts as attributes and as words: steps, calls,
the tools it touched as a space-separated list a host selects with ~=, and
outcome="error" when an answer inside failed. The page falls from 203 rows to
78 blocks.

A run is a plurality: a single row is left alone, because a heading that says
no more than the row does is not worth the row it hides. Two things are never
folded away, and for the same reason: a failure, and a picture.

The heading is every other heading -- a time, a label, a preview -- so the
page still reads down one column, and the rows a run opens onto keep the left
edge the run itself has.

The verbs stay the host's. Knowing that Read means files is knowing Claude
Code, and CC-D2 says only the adapter knows a tool, so the label counts and
names and never says what a tool is for.

A clock is worth a line when it moves. cc-time[repeats] marks a heading time
that reads the same as the one above it -- 56 of 78 on that session -- and the
sheet does not print those. The instant stays on the element, so one rule
prints them all again.

The palette holds WCAG AA everywhere, with no exceptions, which is what
Michal set as the bar. --cc-ink-faint is gone: at 2.54:1 on white it set every
time and every preview, so the two things hardest to read were also the two
things loudest in the way. Quiet is made by reduction now -- fewer lines, one
step down in size, weight -- never by fading text toward its ground. The tiny
size step is gone with it, and cc-item's separator, which the sheet's own
comment calls load-bearing, is drawn in an ink a reader can see.

A turn is a heading line and the words under it, the same two parts as a row
the agent did: the ground moved from cc-message to cc-body, so every time on
the page sits outside a box at one left edge and reads as one thing wherever
it appears.

Measured in the browser on a real session: 78 blocks, one left edge (24), one
right edge (680), no sideways scroll, 0 style attributes, 0 console messages,
0 texts below 4.5:1 in either scheme (worst 6.47 light, 7.44 dark). The
element page and the server page hold an identical cc-transcript, 218 607
characters. A project's plain rules injected before our link still win every
one of the new selectors.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
A clock on every row says almost nothing. Measured over four real sessions,
93% to 99% of a session's wall-clock sits in the few pauses of a minute or
more, and everything else happens inside half a minute. One 36-hour session
printed 78 clocks to describe eleven moments.

So cc-time[repeats] is withdrawn -- it described our rendered string rather
than the conversation, and it carried our clock's resolution into a host's
decision. What a reader is told now is the time that passed: cc-gap sits
between blocks, carrying the seconds, a coarse `over` (minute, hour, day)
because CSS cannot compare numbers, and `turned` where the transcript crossed
into a new day. The page opens by naming its day, so no row is ever undated.
Ten marks on that session, against 78 clocks. Every row still carries its own
instant, and one rule prints them all.

Whether two instants are the same day is decided by asking the clock to write
them both: no calendar arithmetic, and the timezone that answers is the one
the reader is shown. That is why the producer is handed a TranscriptClock,
which writes a time and a day. It is not named Clock: our consumers are ZIO
apps, and zio.Clock is already in their scope -- the collision showed up in
the demo host at once.

A run now says how long it took, in its heading. And a pause ends a run: work
that stopped for an hour and started again is two stretches, so gathering them
would say a run took an hour when nothing ran for most of it -- and would
swallow the pause a reader most wants to see. Two of the three long pauses in
that session were hiding inside runs before this.

Measured in the browser on the same session: 95 blocks, 10 gap marks, 0 clocks
printed, 26 durations, 97 lines at rest against 203 rows before any of this
work. One left edge (24), one right edge (680), no sideways scroll, 0 style
attributes, 0 console messages, 0 texts below 4.5:1. The element page and the
server page hold an identical cc-transcript, 218 226 characters.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
Three things a reader could not see, found by reading the page rather than the
sheet.

A summary laid out as a flex line loses the marker a browser draws for it, so
none of the 27 runs on a real session showed any sign that it opened: the
pointer was the only affordance, and a finger has no pointer. The row draws the
triangle itself now, in the ink of its own line and at the size of its own type,
turning down when the row opens.

Forty-two of the 188 rows carried a `details` with nothing under it — a control
that took a keyboard stop and announced itself as collapsed, and opened onto
nothing. A row with no body is its heading now. Which rows open is the structure
itself, so `expandable` has no work left and is gone; a host selects the rows
that open with `:has(> details)`.

The marker hangs in a column of its own, `--cc-marker`, which is the inline half
of the message padding — so the page has two vertical edges and no more: the one
a message's ground starts on, and the one its first word starts on. Every label
on the page moved onto the second.

Also: keyboard focus is drawn in our own ink rather than left to the browser, on
both kinds of stop — a heading that opens, and a box a browser makes focusable
because its content is wider than the row. A heading under the pointer becomes
easier to read instead of growing a box. On a coarse pointer a heading is 48px
rather than 23. The scheme is declared, so a browser draws its scrollbars to
match. Output that cannot wrap breaks instead of scrolling out of sight.

Measured on a real session: 146 summaries, 0 of them dead; 42 rows now heading
only; markers on every row that opens; both pages identical at 214 964
characters; 0 inline styles, 0 console messages, no sideways scroll at 390px or
1280px. Every text holds 4.5:1 in both schemes — worst reading 6.87:1 — and the
focus ink holds 6.09:1 or better against every ground.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
Two things Michal found reading the page, and one the first of them uncovered.

An open run had a rule under its heading and nothing at its foot, so a reader
could see where the machinery started and not where it stopped. It is bracketed
now: a rule under the heading, a rule under the last row it holds.

The rhythm was missing because the sheet asked the container for it. The demo
host writes `cc-transcript { display: block }` in its own chrome, unlayered, so
it beat our `display: flex` and took the `gap` with it — every row on the page
was spaced by margins alone, and two rounded grounds sat 0px apart. That is the
consumer's stylesheet winning, exactly as intended, and it is why the row
rhythm cannot live on the container: `display: block` is an ordinary thing for
a project to write, and it should not cost every space on the page.

A row owns the space above it now. Measured on a real session, the ladder is
the same whether the transcript lays out as flex or as block: 12px between
rows, 16px between two turns in a row, 20px above a mark where time passed.
The host chrome no longer decides how a transcript lays itself out — it asks
for a measure and centring, which is all it meant.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
Promoted:
- browser verification captures real conversation data -> .gitignore (fixed at source in this branch)

Rejected:
- a vendor prior entered a measurement as if it were data: not generic enough, not a good rule

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
Eight reviewers over the batch, no critical findings. Eight of ten warnings
fixed here; two parked with their reason in the tracker and the report.

Two mattered.

**A markdown link could carry its own bytes into the host document.**
CommonMark's default URL sanitizer allows `data:` beside http/https/mailto, so
a transcript holding `[open](data:text/html;base64,...)` rendered a clickable
`data:` href straight into a document that reads mail — and an image turned
into a reference took the same path. That is the card's own invariant broken:
an artifact crosses as a reference and a media type, never as bytes. Two tests
were written first and both failed. The renderer now names the schemes a
transcript may point at.

**CC-D3 was held by omission rather than by the compiler.** TranscriptMarkup,
Markup, TranscriptClock and Preview cross-compiled into ui.js, where a second
producer of the vocabulary could have been written — in the one module that has
no test at all. None of them is part of the wire contract and nothing in the
browser referenced them. They are JVM-only now, and ui/shared/src holds the
contract and nothing else: the model, the codec, the endpoint description. The
bundle is unchanged at 12 621 bytes gzipped, because dead-code elimination was
already dropping them; the move buys the compiler, not the bytes. ADR 0002 §7
records it.

Also: one rule for what a row's detail becomes, instead of two copies; one
archive read for four endpoints, instead of four; a temp directory that leaked
whenever a test failed; a stylesheet read that said nothing about why it failed;
a test helper nothing called; one word for one thing (`part`, except where it
would collide with a ResultPart); and the session-id guard's ASCII clause, which
nothing had exercised — a Cyrillic id, a null byte and a newline are now pinned
as refused, and four real-shaped ids as carried.

823/823 green, format clean, every demo-host route and refusal re-checked live.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
A match over the entry model names every entry
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fa9cfc1606 
The row-order test matched five of six cases, so adding Hook to the model left
a non-exhaustive match that the incremental build did not surface. A clean
compile did, and the pre-push gate refused the branch for it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
Walking a parsed image's words needs neither null nor a var
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391f8d6438 
CI's linter refused the branch: the node walk that moves an image's words onto
the reference read a Java linked list with a var and two null checks. Reading
the next sibling into an Option before the child is moved says the same thing,
and says why it has to happen in that order -- appending unlinks the child, and
its place in the chain goes with it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
workflow(sl): close cc-chat batch (flush parked items)
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cae4b5bab8 
Both local slices closed on Michal's read. 02-transcript-presentation's parked
list is flushed into the effort map: the ui.js test gap and the sub-agent
measurement sharpen items already there, the contract's open decisions gain the
markup error-decode question, and eight new items land with their triggers.

PR #65, CI green.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GfUk17CWqSK7D7ahc8DJww
mph merged commit bf90e21c62 into main 2026-08-24 09:49:00 +00:00
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