Imported from skyllwt/AutoSci (.claude/skills/poster/SKILL.md). Install upstream with npx skills add skyllwt/AutoSci --skill poster. Copyright stays with the author.

/poster

Generate an academic HTML poster from a drafted paper. Reads paper/main.tex, section files, and figures; builds a PaperX-compatible dag.json intermediate; distills each section into a 2–5 sentence summary; selects representative figures; renders into a self-contained HTML poster with a 3-column auto-fit layout.

Inputs

Common

• paper_dir (optional, default paper/): LaTeX project directory containing main.tex and sections/
• --review (optional): cross-model Review LLM critique of the generated poster content
• --anonymous (optional): force authors to "Anonymous" regardless of \author{} content, the paper/.author_display.txt cache, or --authors
• --no-figures (optional): render every section as text-only (useful for text-heavy posters, or when figures aren't ready)
• --no-logos (optional): skip the affiliation/conference-logo prompts; header shows venue text only
• --no-refine (optional): skip Step 5.5 critique-revise (default runs 1 iteration via Claude)

Power-user (scripted use; rarely needed in interactive runs)

• --authors STR: override the authors text on the poster (e.g. --authors "Morrow Yang, Co-Author"). Useful for one-off override; everyday use is handled by the paper/.author_display.txt cache populated in Step 0 Q1. Ignored if --anonymous is also set.
• --venue STR: venue text for the header right block (e.g. "NeurIPS 2026"). Skips Step 0 venue prompt.
• --affiliation-logo PATH / --conference-logo PATH: logo file paths (PNG/JPG/PDF); each skips the matching Step 0 prompt.
• --layout corners|stacked (default corners): header layout. corners = affiliation top-left, conference top-right; stacked = both logos in the right .conf area with venue text above.
• --auto-figures: skip the per-section figure questions; pick the largest candidate for each section (legacy behavior). The ⚠ wide marker on aspect-extreme figures (≥ 2.0 or ≤ 0.5) is informational only — every selected figure renders inline within its section regardless of aspect.
• --refine-iterations N (default 1, cap 2): number of critique-revise passes in Step 5.5. 0 is equivalent to --no-refine. Bump to 2 if a first pass might not converge on dense content.

Outputs

• poster/dag.json — PaperX-compatible intermediate (reusable by future /slides, /pr)
• poster/outline.html — concatenated <section> blocks before template injection
• poster/poster.html — final self-contained HTML poster (open in browser; Cmd/Ctrl+P → Save as PDF if you need a PDF — see Step 7 report for print settings)
• poster/poster.png — rendered screenshot at 2× CSS dimensions (default 2800×1800) — see Step 5b
• poster/images/ — figures copied/converted (PDF→PNG @ 200 DPI) from paper/figures/
• POSTER_REPORT (printed to terminal)
• wiki/log.md — appended log entry

Wiki Interaction

Reads

• paper/main.tex + paper/sections/*.tex + paper/figures/ — paper source
• wiki/outputs/paper-plan-*.md (optional) — narrative arc, figure plan, evidence map
• wiki/ideas/*.md (optional) — hypothesis, novelty argument for poster opening
• wiki/experiments/*.md (optional) — key results, outcome numbers for headline callouts
• .claude/skills/shared-references/academic-writing.md — de-AI polish rules

Writes

• poster/ directory (all files listed in Outputs)
• wiki/log.md — appended

Graph edges created

• None (the poster is a presentation artifact, not a knowledge entity)

Workflow

Precondition: confirm paper/main.tex exists. If not, error with "Run /paper-draft first."

Step 0: Interactive header configuration

Goal: collect venue text and (optionally) two logos to render in the poster header. Skipped silently for any field the user already supplied as a CLI flag.

The flow uses AskUserQuestion for the yes/no/layout choices, then asks for paths and venue text in free-form (Claude reads the next user message as the answer).

1. Authors — paper-level metadata, resolved with this precedence:

   1. --authors STR flag → use that, do not prompt, do not persist.
   2. --anonymous flag → force "Anonymous", do not prompt, do not persist.
   3. paper/.author_display.txt exists → use its content, do not prompt. This is the "ask once, reuse" cache. Future /paper-draft is expected to seed this file during the writing stage; until then, /poster Step 0 maintains it (see below).
   4. dag.json root content (from \author{...} in main.tex) is non-empty AND not literally "Anonymous" → use it, do not prompt.
   5. Otherwise (anonymized paper, no cached display name): ASK the user.

   Asking flow (only when reached):

   • Use AskUserQuestion:
     • "Keep 'Anonymous' (double-blind submission)" (Recommended)
     • "Provide author names (I'll ask for the string)"
   • If "Provide author names": ask free-text "What author string should appear? e.g. Morrow Yang, Co-Author Name. Reply with the string, or skip to keep 'Anonymous'." Take the next user message as the authors string.
   • Persist the answer to paper/.author_display.txt (one line, no trailing newline beyond the string). On the next /poster run, the file exists → step 0 Q1 is silent. To change later, the user edits or deletes that file.
   • Either branch ("Keep Anonymous" or a provided string) gets persisted — the goal is no more prompts unless the user opts back in by removing the file.

2. Venue text — if --venue was not provided:

   • Ask: "What venue text should appear in the poster header? e.g. NeurIPS 2026. Reply with the text, or skip to leave it blank."
   • Take the next user message verbatim. Treat the literal string skip (case-insensitive) as empty.

3. Affiliation logo — if --affiliation-logo was not provided AND --no-logos was not passed:

   • Use AskUserQuestion with options: "Yes, I have a logo file" / "No, skip the affiliation logo".
   • If yes: ask "What's the path to the affiliation logo? (PNG / JPG / PDF; relative or absolute)." Take the next user message as the path. Verify the file exists; if not, re-ask once with the resolved-path issue surfaced, then either accept a new path or treat as skipped.

4. Conference / journal logo — if --conference-logo was not provided AND --no-logos was not passed:

   • Same flow as the affiliation logo (yes/no via AskUserQuestion, path via free text).

5. Layout — if at least one logo was provided AND --layout was not passed:

   • Use AskUserQuestion with options:
     • "corners — affiliation top-left, conference top-right" (Recommended)
     • "stacked — both logos stacked in the right conf area, venue text on top"
   • If only --venue and no logos: skip the layout question (default corners is fine — only the venue text slot is used).

6. Final summary — print one line:

   • Header config: authors='{...}', venue='{...}', affiliation={path|none}, conference={path|none}, layout={...}

The authors string is applied in Step 5 via python3 tools/poster.py inject-title --authors "..."; the venue/logos are applied via python3 tools/poster.py inject-header.

Step 1: Build dag.json

python3 tools/wiki2dag.py build --paper-dir paper/ --output poster/dag.json

Add --anonymous if the user passed it.

The bridge produces three node types:

• Root (level: 0): paper title in name, authors in content, ordered section names in edge
• Section (level: 1): section heading in name, full prose in content, figure refs in visual_node
• Visual (level: 2): markdown image ref in name, caption in content, WxH in resolution

wiki2dag.py preserves the paper's:

• Math: $…$, $$…$$, \(…\), \[…\] pass through into section content untouched, then render via KaTeX in the poster HTML. Macros defined in math_commands.tex are expanded and any surviving \ensuremath{X} wrapper is unwrapped to $X$ so KaTeX picks it up.
• Citations — dropped by default: \citep{key} / \citet{...} markers are stripped to empty. Real-world conference posters (per CCF-A research) typically omit inline citation markers because there's no room for a reference list. Pass --citations to wiki2dag.py build if you want them back as [N] / [N, M] (built from a first-appearance bibkey → ordinal map). Future poster styles that render a reference footer can opt in.
• Tables: \begin{table}…\end{table} envs (including tables inlined via \input{tables/foo}) are converted to live HTML <table class="poster-table"> blocks with the booktabs caption rendered as a <caption> and \multicolumn, \textbf, \emph, \textit, \texttt handled at the cell level. The Step 3 LLM sees this HTML inside SECTION_JSON.content and must include it verbatim after the summary paragraph (see Step 3). The fit() algorithm sizes table fonts alongside body text; if a table still clips, Step 5.5 sees it via the DOM overflow probe and trims.
• TikZ figures: \begin{figure} envs containing \begin{tikzpicture} but no \includegraphics{} are auto-rasterized to paper/figures/_tikz_<sec>_<label>.png via tools/rasterize_latex.py (pdflatex + pdftoppm). The resulting PNG is a regular visual node from the bridge's perspective — Step 3 picks it up exactly like any other figure. If \includegraphics{} is also present in the same env, the existing pipeline takes precedence (TikZ extraction is skipped). Failed rasterizations are logged to stderr and the figure is dropped; the rest of the pipeline continues. Cached across runs — delete the PNG to force regeneration.

Step 2: Compile WIKI_CONTEXT (optional)

Goal: optionally ground the Step 3 distillation prompts in the paper's own planning artifacts (hypothesis statement, novelty argument, key-result numbers from linked ideas/experiments). Always surface what's happening — do not adopt silently.

Detection + transparency:

• No plan file present: print one line — Step 2: no paper-plan-*.md found in wiki/outputs/ — Step 3 will run without WIKI_CONTEXT. Skip to Step 2.5.

• Plan file present: print one line summarizing what was found, e.g. Step 2: found wiki/outputs/paper-plan-2026-05-17.md (3 linked ideas, 2 experiments). Then AskUserQuestion:

  • "Yes — adopt as WIKI_CONTEXT grounding" (Recommended)
  • "No — distill from paper source only"

If the user picks Yes: read the plan for venue, narrative arc, and linked idea slugs. For each idea slug, read wiki/ideas/<slug>.md for the hypothesis statement and novelty argument. For each linked wiki/experiments/*.md, read the outcome and key_result fields. Assemble into a single WIKI_CONTEXT string keyed by section:

[INTRODUCTION]
hypothesis: <one sentence from idea>
novelty: <one sentence from idea>

[EXPERIMENTS]
key_result: <headline numbers from experiments>
outcome: <one line summary>

If the user picks No: leave WIKI_CONTEXT empty.

This block is passed into the Step 3 prompt under the {WIKI_CONTEXT} slot. The Step 3 prompt explicitly tolerates an empty slot.

Step 2.5: Figure selection

Goal: decide which figure (if any) belongs in each selected section. Runs after dag.json is built and before any LLM distillation, so the figure choice becomes an input to Step 3 rather than something the LLM guesses. Every figure renders inline within its section; the ⚠ wide marker in the manifest is purely informational — a heads-up that an aspect-extreme figure may look cramped in a single column, so the user can pick an alternative figure or skip it.

Section selection (priority list, hard-capped at 6 sections to keep the poster legible at 1400×900):

1. Introduction (Abstract or first section)
2. Method (the section describing the approach)
3. Primary results (Experiments / Replication / main result section)
4. Secondary results / ablation (if space permits)
5. Analysis / discussion (one key insight)
6. Conclusion (brief takeaway)

Mode resolution:

• --no-figures passed → mode = none; every section renders text-only. Skip all questions.
• --auto-figures passed → mode = auto; for each section, pick the visual with the largest area (W×H from resolution). Skip all questions.
• Otherwise → mode = interactive. Run the manifest + questions below.

Print the figure manifest (always, regardless of mode), e.g.:

Figure candidates per section:
  Abstract        — text only
  Introduction    — text only
  Method          — text only
  Experiments     — 2 candidates:
                    [a] layer_curves.png   2378x618  aspect 3.85  ⚠ wide
                    [b] bootstrap.png       974x612  aspect 1.59
  Discussion      — text only
  Conclusion      — text only

Compute aspect from resolution (W×H). The ⚠ wide marker comes from the wide field in dag.json (true when aspect ≥ 2.0 or ≤ 0.5).

Interactive flow (mode = interactive only):

For each section, decide what to ask based on candidate count and wide-flags:

Use AskUserQuestion for each prompt; cap at 4 options total. When a section has 4+ candidates, drop the Let Claude decide option to stay within the limit (the user is being explicit anyway).

Follow-up: layout when ≥2 figures were picked for the same section. Ask via AskUserQuestion (single-select):

The HTML template already supports both side-by-side and vertical-stack natively (flex layout, plus the option of multiple .img-section divs). after-table is a placement variant, not a new CSS class.

After all decisions, print a final summary line:

Figures chosen:
  Experiments → fig2.png + fig3.png (side-by-side)
  Method      → tikz_chain.png (inline)
  (other sections: text only)

Decision record: persist the choices in an in-memory dict keyed by section display name:

{
  "Experiments": {
    "figures": ["images/fig2.png", "images/fig3.png"],   # list, even when 1
    "alts":    ["<caption fig2>",  "<caption fig3>"],    # parallel list
    "layout":  "inline-multi-side",                       # see below
  },
  "Method": {
    "figures": ["images/tikz_chain.png"],
    "alts":    ["<caption>"],
    "layout":  "inline",                                  # single-figure case
  },
  "Conclusion": {"figures": [], "alts": [], "layout": "none"},
  ...
}

layout enum:

• "none" — section is text-only, no figures
• "inline" — exactly one figure inside one .img-section (back-compat with single-figure flow)
• "inline-multi-side" — 2+ figures inside ONE .img-section (flex side-by-side)
• "inline-multi-stack" — 2+ figures, each in its own .img-section (vertical stack)
• "inline-multi-after-table" — 2+ figures side-by-side, placed AFTER any <table class="poster-table"> in the section content

This dict is consumed in Step 3 to fill the per-section prompt variables.

Step 3: Distill poster sections

Load poster/dag.json and the figure-decision dict from Step 2.5. Iterate the selected section nodes in order.

For each selected section, prepare the variables for the prompt below. Figure variables come from the Step 2.5 decision dict — do NOT re-derive them here.

• SECTION_JSON: the section node from poster/dag.json with the visual_node field removed (the visual is conveyed separately). Keep only name, content, level.
• LAYOUT: one of "none" / "inline" / "inline-multi-side" / "inline-multi-stack" / "inline-multi-after-table" from decisions[section_name]["layout"]. Drives the HTML template branch.
• IMAGE_SRCS: list of image sources from decisions[section_name]["figures"], e.g. ["images/fig2.png", "images/fig3.png"]. Empty list if LAYOUT == "none".
• ALT_TEXTS: parallel list of captions from decisions[section_name]["alts"]. Same length as IMAGE_SRCS.
• WIKI_CONTEXT (optional): a short block compiled from Step 2 — hypothesis statement, novelty argument, key-result numbers from linked ideas/experiments. Empty string if no wiki context was loaded.

Run the following prompt for each section (ported from PaperX poster_outline_prompt, extended for LAYOUT and WIKI_CONTEXT):

You are given a section node JSON (SECTION_JSON) from a paper DAG. The section JSON you see has NO visual_node field and must be treated as authoritative.

SECTION_JSON: {SECTION_JSON}

LAYOUT: {LAYOUT} # one of "none" | "inline" | "inline-multi-side" | "inline-multi-stack" | "inline-multi-after-table"

If LAYOUT is not "none", you are also given IMAGE_SRCS (a list of image paths) and ALT_TEXTS (parallel list of captions). The visual content MUST ONLY come from these provided sources (do not invent or substitute any other image). For single-figure layouts ("inline"), the lists each have length 1. For multi-figure layouts, length ≥ 2 and the order in the list is the order figures should appear in the rendered HTML (left-to-right for *-side, top-to-bottom for *-stack).

IMAGE_SRCS: {IMAGE_SRCS} ALT_TEXTS: {ALT_TEXTS}

WIKI_CONTEXT (optional, may be empty — use it ONLY to ground concrete numbers/claims, never to invent content not in the section): {WIKI_CONTEXT}

Task:

1. Write ONE concise paragraph summarizing ONLY the section's content for a scientific poster. Constraints: 2–5 sentences, factual, non-hallucinatory, no bullet lists, avoid starting with "This section". The summary must contain no more than 40 words and be written with strong logical coherence and smooth transitions to minimize perplexity.
2. Output the HTML block for this section, choosing the template variant matching LAYOUT. Output ONLY the HTML and nothing else.

Strict output rules:

• Output only the HTML for one section (one <section> block).
• Do NOT add markdown fences, explanations, or extra text.
• The <div class="section-bar"> must be the section title (use SECTION_JSON.name).
• Replace the sample paragraph with your summary.
• LAYOUT == "none": output the section block with NO <div class="img-section">.
• LAYOUT == "inline": output the section block with exactly one <div class="img-section"> containing one <img> whose src is IMAGE_SRCS[0] and alt is ALT_TEXTS[0].
• LAYOUT == "inline-multi-side": output ONE <div class="img-section"> containing all <img> tags in IMAGE_SRCS order; the template's flex layout splits them horizontally.
• LAYOUT == "inline-multi-stack": output MULTIPLE <div class="img-section"> blocks, one per <img>, in IMAGE_SRCS order. Stacked top-to-bottom.
• LAYOUT == "inline-multi-after-table": same as "inline-multi-side" (one .img-section with all <img> tags) but place that .img-section AFTER the <table class="poster-table"> block(s) inside <div class="section-body">. Useful when the section's table is the primary artifact and figures serve as visual support.
• TABLES: if SECTION_JSON.content contains one or more <table class="poster-table">…</table> blocks, include EACH ONE verbatim (preserve the entire block byte-for-byte, including <caption>, <thead>, <tbody>, all <tr> / <th> / <td> tags and their attributes) inside <div class="section-body"> AFTER your summary <p>. Do NOT paraphrase, restructure, or trim the table HTML. Exception — drop a table only if it is obviously too large for one column (> 5 columns AND > 6 rows) AND summarizing 2–3 key cells in prose would preserve the result; in that case, drop the table and call out the key numbers in your summary <p>.

Required HTML templates (pick the one matching LAYOUT):

LAYOUT = "none":

<section class="section">
  <div class="section-bar" contenteditable="true">SECTION_TITLE</div>
  <div class="section-body" contenteditable="true">
    <p>SUMMARY_TEXT</p>
  </div>
</section>

LAYOUT = "inline" (single figure):

<section class="section">
  <div class="section-bar" contenteditable="true">SECTION_TITLE</div>
  <div class="section-body" contenteditable="true">
    <p>SUMMARY_TEXT</p>
    <div class="img-section">
      <img src="IMAGE_SRCS[0]" alt="ALT_TEXTS[0]" class="figure" />
    </div>
  </div>
</section>

LAYOUT = "inline-multi-side" (≥2 figures, horizontal):

<section class="section">
  <div class="section-bar" contenteditable="true">SECTION_TITLE</div>
  <div class="section-body" contenteditable="true">
    <p>SUMMARY_TEXT</p>
    <div class="img-section">
      <img src="IMAGE_SRCS[0]" alt="ALT_TEXTS[0]" class="figure" />
      <img src="IMAGE_SRCS[1]" alt="ALT_TEXTS[1]" class="figure" />
      <!-- repeat for IMAGE_SRCS[2], etc. -->
    </div>
  </div>
</section>

LAYOUT = "inline-multi-stack" (≥2 figures, vertical):

<section class="section">
  <div class="section-bar" contenteditable="true">SECTION_TITLE</div>
  <div class="section-body" contenteditable="true">
    <p>SUMMARY_TEXT</p>
    <div class="img-section">
      <img src="IMAGE_SRCS[0]" alt="ALT_TEXTS[0]" class="figure" />
    </div>
    <div class="img-section">
      <img src="IMAGE_SRCS[1]" alt="ALT_TEXTS[1]" class="figure" />
    </div>
    <!-- one .img-section per figure -->
  </div>
</section>

With a table — when SECTION_JSON.content contains <table class="poster-table">, insert the verbatim table block(s) after the summary <p>. Default placement order inside <div class="section-body">:

1. summary <p>
2. <table class="poster-table">…</table> (all tables, in source order)
3. <div class="img-section">…</div> (if LAYOUT requires figures)

If LAYOUT is "inline-multi-after-table" the order is the same — the name is just a hint that the table is the primary artifact. Example:

<section class="section">
  <div class="section-bar" contenteditable="true">SECTION_TITLE</div>
  <div class="section-body" contenteditable="true">
    <p>SUMMARY_TEXT</p>
    <table class="poster-table">…verbatim from SECTION_JSON.content…</table>
    <div class="img-section">
      <img src="IMAGE_SRCS[0]" alt="ALT_TEXTS[0]" class="figure" />
      <img src="IMAGE_SRCS[1]" alt="ALT_TEXTS[1]" class="figure" />
    </div>
  </div>
</section>

Apply de-AI polish per shared-references/academic-writing.md (vary sentence openings, drop signature words like "leverage", "comprehensive", "delve"). Pull headline numbers from WIKI_CONTEXT when present — these make poster results concrete.

Write all blocks (in selection order) to poster/outline.html.

Step 4: Add inter-section transitions

Apply the following prompt to the assembled outline (adapted from PaperX):

Prompt: You are given an HTML-like poster outline of multiple <section class="section"> blocks. Each section has a title in <div class="section-bar"> and main text in the first <p> inside <div class="section-body">.

Generate one bridging sentence per section from the FIRST up to the SECOND-TO-LAST. Place each at the END of that section's first <p> to lead into the NEXT section's topic.

Output: a JSON array of strings. Length = (number_of_sections − 1). The i-th string bridges section i to section i+1. Each is one sentence (12–25 words), fluent academic English, no newlines.

Patterns to prefer:

• When the next section introduces/elaborates/substantiates a method or idea: "To introduce / elaborate on / substantiate <next topic>, we next present <next title>."
• When the next section is experimental: "Next, we evaluate <subject> to demonstrate ..." or "We then conduct experiments on <task> to empirically validate ..."
• Always reference the next section's topic without introducing new technical claims.

Parse the JSON array. For each string, append it to the end of the corresponding section's first <p> in poster/outline.html. The last section gets no bridge.

Step 5: Build the poster

python3 tools/poster.py build \
  --template templates/poster/poster_template.html \
  --outline poster/outline.html \
  --output poster/poster.html

python3 tools/poster.py inject-title \
  --dag poster/dag.json \
  [--authors "{authors override from Step 0 or --authors flag}"] \
  poster/poster.html

The --anonymous flag is applied at Step 1 (wiki2dag.py) — dag.json already carries the canonical title/authors, so inject-title reads from there by default. Pass --authors to override when the paper's \author{} was intentionally left empty (e.g. for double-blind submission) but a real author string is desired on the poster. --anonymous (on inject-title) still wins over --authors if both are set.

# Apply the venue text + logos from Step 0. Omit flags that the user skipped.
python3 tools/poster.py inject-header \
  --venue "{venue from Step 0}" \
  [--affiliation-logo {path}] \
  [--conference-logo {path}] \
  --layout {corners|stacked} \
  poster/poster.html

python3 tools/poster.py inject-figures \
  --dag poster/dag.json \
  --paper-dir paper/ \
  --poster-dir poster/

python3 tools/poster.py validate poster/poster.html

inject-figures copies PNG/JPG sources verbatim and converts PDF sources to PNG at 200 DPI via pdftoppm. validate checks that every <img src=...> resolves, the title is non-empty, at least 3 sections are present, and no TODO/FIXME/[UNCONFIRMED] markers remain.

Step 5b: Render PNG

After validation passes, render the HTML poster to PNG so the user has a flat screenshot (also used as input by the future Step 5.5 critique-revise pass):

python3 tools/poster.py render poster/poster.html

This writes poster/poster.png at 2× the CSS pixel dimensions (default 2800×1800). Override with --scale {1,2,3} (1 = fast preview, 3 = print quality).

Render engine: prefers Playwright (Chromium) when available, falls back to subprocess against a system browser. Playwright is strongly preferred because it waits on specific events before screenshotting — document.fonts.ready, all <img> load events, and flow.scrollWidth stable for 10 consecutive animation frames (fit() converged). The subprocess fallback uses --virtual-time-budget=5000, a wall-clock timeout that can race with slow CDN responses for Google Fonts / KaTeX. This is the exact wait semantics PaperX uses.

Install Playwright (one-time, recommended): pip install playwright && python -m playwright install chromium. Without it, render still works via the subprocess path; print output shows browser: chromium (subprocess) vs browser: playwright-chromium (preferred).

Subprocess fallback browser detection: Chrome → Edge → Chromium → Firefox (last resort). Chrome/Edge/Chromium are equivalent (same engine, identical CLI flags). Firefox works but with two caveats — no HiDPI scaling (PNG comes out 1× regardless of --scale) and no --virtual-time-budget equivalent. render prints warnings to stderr when it falls back to Firefox.

Safari is not supported — it has no headless CLI screenshot flag; integration would require safaridriver + Selenium WebDriver. macOS-only users with only Safari should brew install --cask google-chrome (one command) to unlock the full pipeline.

If no supported browser is found, render exits with platform-specific install hints. The HTML poster remains usable in any browser — the user can still open poster/poster.html directly.

Step 5.5: Critique-revise via Claude (screenshot + DOM overflow report)

Goal: refine the HTML using both a programmatic overflow report (ground truth from the rendered DOM) and the screenshot (visual context). The DOM report is what fit() and the LLM can both miss — it measures every leaf element's bottom/right vs the flow's edges and reports any clipping precisely. The LLM cannot declare convergence while the report shows clipping; it must trim prose until the report comes back clean.

Auto-applied; no user interaction.

Skip conditions:

• --no-refine flag passed → skip Step 5.5 entirely.
• --refine-iterations 0 → equivalent to --no-refine.
• Step 5b failed to produce poster/poster.png (no supported browser installed) → skip with a warning.

Iteration count: from --refine-iterations N (default 1, hard cap 2). Note: convergence is gated on the overflow report, not just on prose stability — see Termination below.

Workflow per iteration (i = 1..N):

1. Ensure poster/poster.png reflects the current poster/poster.html. If the HTML was modified since the last render, re-run python3 tools/poster.py render poster/poster.html.

2. Run python3 tools/poster.py check-overflow poster/poster.html --output raw/tmp/poster.overflow.json (scratch path — poster/ only ever contains final artifacts). Read the JSON.

3. Early convergence (overflow-only path): if i == 1 AND overflow.ok == true AND no obvious LaTeX/encoding/numbering issues are visible in the screenshot at a careful look (apply the mandatory checklist in the refinement prompt below to your own evaluation), you MAY declare convergence here: record "converged after 0 iterations — DOM clean, no visible content issues" and exit. Skip this shortcut if you have any doubt — the cost of one refinement pass is small compared to shipping a poster with subtle issues.

4. Snapshot pre_html = <current poster.html> in memory — needed for the prose-stability convergence check.

5. Read poster/poster.png (multimodal), poster/poster.html, and raw/tmp/poster.overflow.json (the ground-truth clipping report).

6. Apply the refinement prompt below. Pass the overflow JSON as part of the prompt — the LLM uses it to know exactly which sections need trimming, instead of guessing from the screenshot. Use Claude (in-session, multimodal). Do NOT use mcp__llm-review__chat — text-only per mcp-servers/llm-review/server.py.

7. Parse the LLM output: extract HTML from the first ```html fenced block.

8. Write the revised HTML back to poster/poster.html. Snapshot it as post_html.

9. Re-run python3 tools/poster.py validate poster/poster.html. If validation fails: stop, surface issues to the user, leave HTML as-is.

10. Re-render to poster/poster.png. Re-run check-overflow --output raw/tmp/poster.overflow.json → updated report.

11. Convergence check (requires BOTH):

    • (a) New overflow report shows ok == true, AND
    • (b) pre_html and post_html differ by < 50 chars inside the .flow region.

    If both: declare convergence ("converged after {i} iteration(s) — DOM clean and prose stable") and exit.

    If overflow.ok is still false: refinement is mandatory for the next iteration; the loop continues even if prose-stable. The LLM didn't trim enough.

    If iteration budget is exhausted but overflow.ok is still false: stop with a clear warning ("Step 5.5 ran N iterations but couldn't clear DOM overflow — consider re-running with --refine-iterations 2, or hand-trim the longest section's prose in poster/outline.html"). Leave HTML / PNG as-is for the user to inspect.

Why this design: in the previous version, the LLM declared convergence based on a casual visual scan of a downscaled PNG. Subtle clipping at column edges slipped through. The DOM overflow report removes LLM judgment from the detection of clipping — clipping is now a measurement, not a guess. The LLM's job becomes specifically fixing what the report flags, not also deciding whether there's anything to fix.

Refinement prompt (ported from PaperX poster_refinement_prompt; extended with the overflow JSON input + mandatory pre-flight checklist):

You are an expert Academic Poster Designer and Web Developer. Your task is to refine an existing HTML poster based on its visual rendering (screenshot), the current HTML code, and a structured DOM overflow report.

INPUTS:

1. Current Poster Code (HTML) — full poster.html
2. Visual Render (PNG screenshot) — poster.png attached via Read
3. DOM Overflow Report (JSON) — output of tools/poster.py check-overflow. This is ground truth about which elements are clipped. If clipped is non-empty, you MUST fix each entry.

MANDATORY PRE-FLIGHT CHECKLIST — answer BEFORE generating any HTML. Write this as a fenced ```json block first; then below it, output the corrected HTML in a separate ```html block.

{
  "overflow_report_ok": <true|false; copy from the report's "ok" field>,
  "clipped_count":     <integer; the length of the report's "clipped" array>,
  "col1_bottom_ok":    <true|false; from the screenshot, is the last text line in col 1 ≥ 10 px above the .poster bottom border AND fully readable?>,
  "col2_bottom_ok":    <true|false; same check for col 2 — pay specific attention to any figure's x-axis label>,
  "col3_bottom_ok":    <true|false; same check for col 3>,
  "latex_leaks":       <list of strings; raw LaTeX patterns you found, e.g. ["\\textbf{x}", "\\citep{key}"] — empty list if none>,
  "numbering_prefixes": <list of strings; section-bars with leading "1.", "A.", etc. — empty list if none>,
  "will_revise":       <true|false; if ANY of the above signal a problem, this MUST be true and the HTML block below MUST contain trimming/fixes>
}

If will_revise: false, your HTML block may be identical to the input.

If will_revise: true, the HTML block MUST contain real edits addressing each flagged issue. Do not output unchanged HTML claiming you fixed it — that's the failure mode this checklist exists to prevent.

TASKS (apply only where flagged by the checklist):

Task 1: Fix LaTeX / encoding leaks (when latex_leaks non-empty)

• Replace raw LaTeX with HTML entities or Unicode (\\textbf{x} → <strong>x</strong>, \\citep{key} → [N], $d_S \\ge 10$ → d_S ≥ 10).

Task 2: Normalize section headers (when numbering_prefixes non-empty)

• Strip leading 1., 2.1, A., E., - , etc. from <div class="section-bar"> contents.

Task 3: Fix DOM-reported clipping (when overflow_report_ok: false)

• The JSON's clipped array names every offending element with its section_title, tag, bottom_overflow_px, and a content preview. For each clipped element, trim the corresponding section's prose conservatively (drop filler words, tighten sentences) until that element fits. Never delete claims, citations, or math expressions.

Task 4: Fix screenshot-only issues (when any colN_bottom_ok: false)

• The DOM check has tolerance; visually cramped content (line right against the border) may still pass overflow.ok: true. If the screenshot shows this, trim the relevant column's prose by 5–15 words.

Output requirements:

• First, the ```json checklist block (mandatory).
• Then, the ```html block: complete, runnable HTML.
• Preserve the CSS, the <script> fit algorithm, and font-related settings exactly. Only edit content inside <section class="section"> and the title/authors slots.

HTML poster:

{full content of poster/poster.html}

DOM Overflow Report:

{full content of raw/tmp/poster.overflow.json}

Screenshot: (the contents of poster/poster.png attached via the Read tool — Claude reads it as an image)

Termination conditions:

• Convergence (preferred): overflow.ok=true AND prose diff < 50 chars. Exit normally.
• Iteration cap reached with overflow.ok=true: also exit normally.
• Iteration cap reached with overflow.ok=false: stop and warn the user — the budget wasn't enough to clear all clipping. Suggest --refine-iterations 2 or hand-trimming the longest section's prose in poster/outline.html.
• LLM output missing the JSON checklist block → stop, log warning ("refinement LLM did not produce the mandatory pre-flight checklist"), leave HTML as-is.
• LLM output missing the HTML fenced block → stop, log warning, leave HTML as-is.
• Validation fails after revision → stop, surface validation issues, leave HTML as-is.
• LLM declares will_revise: false but overflow.ok is false → log warning ("refinement LLM ignored DOM clipping report"), continue to next iteration if budget remains; otherwise warn user.

Step 6: Optional Review LLM critique (--review)

If --review is passed, send the poster HTML to the Review LLM:

mcp__llm-review__chat
  system: "You are a senior researcher reviewing an academic poster.
           Evaluate: (1) Is the content hierarchy clear? (2) Are key results prominently placed?
           (3) Is each section self-contained and readable? (4) Is the visual balance good (text vs figures)?
           (5) Are transitions between sections logical? (6) Would a passerby understand the contribution in 30 seconds?"
  message: |
    ## Poster HTML
    {full content of poster/poster.html}

    ## DAG
    {full content of poster/dag.json}

    Review for: content completeness, text density, figure selection, narrative flow.
    Flag any section that is unclear, off-topic, or missing key context.

Apply revisions by editing poster/outline.html and re-running Step 5. Do not loop more than 2 review-revision rounds.

Step 7: Log and report

python3 tools/research_wiki.py log wiki/ \
  "poster | generated poster for '{title}' | {N} sections, {M} figures | reviewed: {yes/no}"

Print POSTER_REPORT:

# Poster Report

## Source
- Paper: {title}
- Authors: {authors}
- Paper directory: {paper_dir}

## Generation
- Sections included: {N}/{total available}
- Figure selection mode: {interactive | auto | none}
- Figures embedded: {M}
- PDF→PNG conversions: {K}
- Header: venue='{venue}', affiliation={path|none}, conference={path|none}, layout={corners|stacked}
- Critique-revise (Step 5.5): {k/N iterations applied | converged after k/N (no material changes) | skipped (--no-refine) | skipped (no headless browser)}
- Review LLM (Step 6): {invoked / skipped}

## Output
- poster/poster.html ← open in a browser
- poster/poster.png ← flat screenshot, 2× CSS (default 2800×1800)
- poster/dag.json (intermediate, reusable by /slides /pr)

## Export to PDF
Open `poster/poster.html` in Chrome / Edge / Firefox, then **Cmd+P** (macOS)
or **Ctrl+P** (Win/Linux) → **Save as PDF**. Recommended print settings:
- Layout: **Landscape**
- Paper size: **Custom 1400×900 px** (fall back to Letter / A3 Landscape if Custom is unavailable)
- Margins: **None**
- Scale: **100%** (or "Fit to page" if 100% overflows)
- Background graphics: **On** (so the blue header + section bars render)

## Notes
- {any warnings, e.g. missing figures, sections selected, etc.}

Constraints

• Do not modify paper/ source files: this skill is read-only over LaTeX source (main.tex, sections/*.tex, figures/, references.bib, math_commands.tex). The only allowed writes to paper/ are: (a) paper/.author_display.txt — Step 0 author cache; (b) paper/figures/_tikz_<sec>_<label>.png — rasterized TikZ figure cache (Step 1, see "TikZ figures" in Step 1's preservation list). The _tikz_ prefix marks these as derived from paper/sections/*.tex; they're safe to delete (next run rebuilds). All other output goes to poster/.
• Do not create wiki entities or graph edges: the poster is a presentation artifact.
• Reuse compiled figures: do not regenerate figures from paper/figures/plot_*.py. The user already ran /paper-compile.
• Respect --anonymous: when set, authors become "Anonymous" in both dag.json and the poster header.
• Max section limit: hard-coded at 6 sections to keep the poster legible at 1400×900. Sections are selected from the priority list in Step 2.5; Related Work / Background / Appendix get dropped first when papers have more sections than the cap.
• 40-word summary: per the poster_outline_prompt, each section paragraph stays ≤ 40 words before transitions are added.
• De-AI polish is mandatory: per shared-references/academic-writing.md. Avoid signature openings ("In this work", "We propose", "Our approach"), replace inflated verbs ("leverage" → "use", "delve" → "examine").
• Strict template injection: tools/poster.py build only injects between <div class="flow" id="flow">...</div>; do not edit the template's CSS or JavaScript fit algorithm.
• Figure selection is interactive by default: omitting both --auto-figures and --no-figures runs the Step 2.5 manifest + question flow. The flags are user-owned per CLAUDE.md rule 5 — do not infer them; ask if unsure which mode to use.
• No special layout for wide figures: every figure renders inline within its <section>. The wide flag on visual nodes is informational only — used to surface the ⚠ marker in the manifest so the user can pick an alternative or skip a cramped figure. A future figure-generation skill is expected to solve the aspect-ratio problem upstream by producing poster-fit figures.

Error Handling

• paper/main.tex not found: error with "Run /paper-draft first to generate the paper."
• No sections found in \input{sections/...}: error with the list of files searched; suggest checking main.tex for non-standard section includes.
• No figures referenced: continue with text-only sections; warn in POSTER_REPORT.
• pdftoppm not installed: PDF figures fail to convert; warn and suggest brew install poppler (macOS) or apt install poppler-utils (Linux). The poster will still render but with broken image refs for those figures.
• Nested figure paths (paper/figures/exp1/foo.pdf): the bridge currently flattens to images/foo.png and the figure resolver looks only in paper/figures/. If two figures across nested dirs share the same basename, the second one wins. Flat paper/figures/ is the supported layout for now.
• PIL/Pillow not installed: image resolutions cannot be computed; dag.json visuals have empty resolution. The poster_outline_prompt loses its "highest-resolution wins" tiebreaker — Claude picks by section order instead. Suggest pip install Pillow.
• Validation fails: print all issues to stderr; do not delete the partial output. User can fix the outline and re-run from Step 5.
• No supported browser found for render: print install instructions per platform (Chrome / Edge / Chromium recommended; Firefox accepted as fallback) and continue. The HTML poster is still usable; only the PNG is missing. Step 5.5 critique-revise also skips (no screenshot → nothing to critique). Safari is not supported (no headless CLI).
• Firefox fallback in use: render prints warnings to stderr (no HiDPI scale, layout may not be fully converged). Output is functional but lower quality than Chrome/Edge. Suggest the user install a Chromium-based browser for best results.
• Refinement output malformed (Step 5.5): if the LLM does not return a fenced ```html block containing a valid <section> + <h1 class="title">, stop the iteration loop, leave the HTML unchanged, and surface a warning. Do NOT overwrite the HTML with broken output.
• Review LLM unreachable: skip Step 6, note in report, continue.

Dependencies

Tools (via Bash)

• python3 tools/wiki2dag.py build --paper-dir <dir> --output <path> [--anonymous] [--citations] — build dag.json; --citations opts back in to inline [N] markers (default: dropped, no reference list on the poster)
• python3 tools/poster.py build --template <path> --outline <path> --output <path> — inject outline
• python3 tools/poster.py inject-title --dag <path> <poster.html> [--anonymous] [--authors STR] — set title/authors; --authors overrides dag.json's author field when the paper was anonymized at the source
• python3 tools/poster.py inject-header <poster.html> [--venue STR] [--affiliation-logo PATH] [--conference-logo PATH] [--layout corners|stacked] — venue text + optional logos
• python3 tools/poster.py inject-figures --dag <path> --paper-dir <path> --poster-dir <path> — figure copy/convert
• python3 tools/poster.py validate <poster.html> — sanity checks
• python3 tools/poster.py render <poster.html> [--scale 1|2|3] [--output PATH] — HTML → PNG via headless browser (Chrome / Edge / Chromium preferred, Firefox fallback)
• python3 tools/poster.py check-overflow <poster.html> [--output PATH] — Playwright DOM query for clipped content; emits poster.overflow.json. Used as ground truth by Step 5.5.
• python3 tools/research_wiki.py log wiki/ "<message>" — append log
• pdflatex (TeX Live) — required for TikZ figure rasterization (Step 1); install via brew install --cask mactex / apt install texlive-full. With tikz, pgfplots, standalone, booktabs, multirow, array, xcolor, amsmath, amssymb packages. If absent, TikZ figures inside \begin{figure} envs without \includegraphics{} are dropped with a stderr warning; the rest of the build continues.
• pdftoppm (poppler) — PDF → PNG conversion at 200 DPI (used both for paper figures and for rasterized TikZ)
• pdfinfo (poppler) — PDF page-size for resolution
• Playwright + Chromium (preferred, optional) — pip install playwright && python -m playwright install chromium. Enables event-driven waits (fonts/images/fit-stable). Falls back gracefully if missing.
• Headless system browser (fallback) — auto-detected in this order: Google Chrome → Microsoft Edge → Chromium → Firefox. Chrome/Edge/Chromium are equivalent; Firefox renders at 1× scale only and without sync-wait. Safari is not supported (no headless CLI).

MCP Servers

• mcp__llm-review__chat — optional cross-model review (--review)

Claude Code Native

• Read — read .tex, dag.json, outline.html
• Write — write outline.html
• Edit — apply transition sentences to outline.html
• Bash — invoke wiki2dag, poster, research_wiki tools

Shared References

• .claude/skills/shared-references/academic-writing.md — de-AI polish standards
• .claude/skills/shared-references/cross-model-review.md — Review LLM protocol (when --review)

Called by

• Manual user invocation
• Future: /research Stage 5b (post paper-compile)