dsh-attachment-formats — DeepSeek Harness Attachment Expansion (dsh-plugin, Codex-style)

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DeepSeek Harness plugin (dsh-plugin) for the Web GUI — dsh plugin add one-liner. Makes the composer accept PDF, Office (docx/xlsx/pptx), TIFF, epub/odt/rtf, long-document text and scanned-PDF OCR, Codex-style. Keywords: dsh, deepseek-harness, cordis, pdf-extraction, tesseract, deepseek-vision, files-api.

A DeepSeek Harness web plugin (dsh-plugin, Cordis) that makes the composer accept many more attachment formats, Codex-style. Zero core-package changes: a pure plugin that reuses the harness-native image draft rail, upload limits, history rendering and model request pipeline.

# one-liner (GitHub)
dsh plugin --profile web add github:linkingoscar/dsh-attachment-formats
# alias (npm, when published)
dsh plugin --profile web add dsh-attachment-formats

Paperclip button · drag & drop / paste · official per-session injection · index-card never silently truncated — captured via Playwright against a local mock of the composer.

Supported formats

Document cards (Codex-style mounting, composer stays clean)

Text-like attachments that are dragged in or picked are not stuffed into the input box: their content mounts as a document card above the composer (file name + character count + full-text/index label, individually removable), while images keep flowing into the native image draft rail. You type normally, and at the moment of sending the plugin merges the card content into the message (with [attachment: <file name>] provenance markers) before the native submit — your prompt always stays on top and no content is lost:

• each card has a send button: send documents even without typing anything;
• pressing Enter / the native send button merges the cards first, then submits;
• cards are not merged while the model is mid-reply (they stay put for later).

Long documents (index-card mode, never silently truncated)

Text beyond 80k characters and long multi-page PDFs are not stuffed into the message. Instead:

1. the host spills them into the session workspace .dsh-attachments/<sha-16>/ (content-addressed, reused on re-drop, auto-cleaned after ~7 days of no access):
   • doc.md — PDF text layer assembled per page (leading <!-- pN --> markers), Office-extracted text, long text as-is (long JSON is prettified to doc.json);
   • pages/pNN.png — rendered page images (≤100 pages, for vision models via read_image; rendered lazily, only when the index-card path needs them);
   • manifest.json — source, page/line/char counts, engine, full source SHA-256 and the converter-policy fingerprint (engine/OCR/doc-server switches invalidate the cache automatically);
   • INDEX.md (cache root) — the aggregated list of every spilled document in this workspace.
2. the message carries only a few-hundred-token index card: page/line/char counts, an outline (PDF heading heuristics, md headings, JSON first-level key tree) and reading pointers.
3. the model reads page-by-page with the stock read tool (offset/limit, line numbers as coordinates) — full summaries read through (no dropped tails), targeted lookups jump by outline; missing content is an explicit tool failure, never silent loss.

Design rationale and evidence: docs/design-longdoc.md; comparison with similar work: docs/alternatives.md. Upgrades for current limitations (researched GitHub solutions and v0.6 roadmap): docs/upgrade-v6.md.

Engines & OCR (v3)

• PDF text engine: auto (default) → the venv's pymupdf4llm for ≤40 pages (high-fidelity tables/headings); pdfjs (seconds) for larger documents or when the venv is missing. Env: DSH_ATTACH_ENGINE=auto|python|builtin.
• Scanned-PDF OCR: python (PyMuPDF, needs system tesseract) → tesseract.js (pure JS; first use downloads the ~24MB eng/chi_sim language data into vendor/tessdata/). Confidence below 45 falls back to page images with a clear reason. Env: DSH_ATTACH_OCR=auto|baidu|tesseract-js|off (see below).

Fidelity & format coverage

• DOCX tables: mammoth HTML → turndown + GFM plugin — tables survive as Markdown pipe tables (replaces the old cell-by-cell reading order).
• TIFF: decoded by sharp (libvips prebuilt binary) into PNG pages, multi-page supported (≤20 pages per file).
• epub / odt / rtf: pandoc (probed on PATH) converts to Markdown; without pandoc, epub/odt fall back to in-process jszip + turndown, rtf reports a clear install hint.
• Legacy .doc / .xls / .ppt: LibreOffice headless (soffice, probed on PATH plus the usual Windows install locations) converts to the modern OOXML format first, then the standard Office pipeline runs. Each run uses an isolated UserInstallation profile to avoid lock conflicts.
• PDF outlines: bookmark TOCs (get_toc / pdfjs getOutline) now feed the index card's outline first; the font-size heuristic is only the fallback. Empty-bookmark PDFs are unaffected.

Cloud OCR & content-adaptive engine (zero new heavyweight deps)

• Baidu OCR API (preferred scanned-PDF OCR, free tier: 1,000 calls/month for personal accounts / 2,000 for enterprise on both 标准版 and 高精度版, per the official free-quota page): pages are sent as JPEG via plain HTTPS — no new dependencies. Configure via env:
  • BAIDU_OCR_API_KEY / BAIDU_OCR_SECRET (console → 文字识别 → create app);
  • DSH_ATTACH_OCR=auto|baidu|tesseract-js|off (auto = Baidu when credentials exist, else local tesseract.js);
  • DSH_ATTACH_OCR_ACCURATE=1 for the high-accuracy endpoint (separate free quota). Quota exhausted / API failure → automatic fallback to local tesseract.js with a note; forced baidu mode reports the reason instead.
• Remote VLM OCR (optional, token-billed): DSH_ATTACH_VLM_BASE / DSH_ATTACH_VLM_MODEL (+ optional DSH_ATTACH_VLM_KEY) point at any OpenAI-compatible vision endpoint (olmOCR-2, GLM-4V, Qwen-VL…). Pages are transcribed one by one via chat/completions. In auto, only the first configured cloud provider receives a document; failure falls back to local tesseract.js. Cross-cloud retry is explicit opt-in (DSH_ATTACH_CROSS_CLOUD_FALLBACK=1).
• Content-adaptive PDF engine: documents of 41–160 pages now let the Python engine decide by vector density (sampled get_drawings) — text-heavy manuals skip the slow high-fidelity pass and go straight to the fast pdfjs engine, while table/graphic-heavy documents still get pymupdf4llm. ≤40 pages are unchanged.

External doc server, cache page & workspace zero-copy

• External document parser (optional): DSH_ATTACH_DOC_SERVER=<base URL> points at a parser service (PP-StructureV3 paddleocr serve, MinerU, or any shim). Contract: POST {base}/convert with multipart field file → { "ok": true, "markdown": "..." }. When configured, PDFs go to the server first; any failure falls through to the local engine chain.
• Attachment cache settings page: Settings → 附件缓存 lists every spilled document (size/engine/time) with per-item delete and clear-all, backed by GET /api/attach-formats/cache + POST .../cache/delete + POST .../cache/clear.
• Workspace zero-copy: text files between 512KB and 16MB are first resolved against the session workspace: the browser reads the file locally to compute its full SHA-256, then GET /api/attach-formats/resolve asks the host to confirm a same-source file by name + size + full SHA-256 (bounded ~2.5s walk skipping dependency dirs). A hit mounts a 📎 reference card — the content is not uploaded (only the name, size and hash are sent); the model reads the path with its read tool. A miss falls back to the normal upload pipeline. Files over 16MB are rejected outright (no zero-copy attempt).

Context adaptation & full-text command (v2b)

• Adaptive merge limit: the client reads the token-meter contextPressure projection (model context window × current usage); the full-text merge limit becomes min(80k chars, headroom × 1.5) — when headroom is short, the card automatically turns into an index card with a status-bar note, so merged content can never blow up the context and get silently truncated by the API. A missing projection falls back to the fixed 80k threshold.
• /attach command (composer slash menu, host-registered):
  • /attach list — list the spilled documents in this workspace (id/name/size/engine);
  • /attach full <id|name> — merge the full text into model context as a next-step message (takes effect on the next message, current turn untouched); 300k-char cap with an explicit truncation notice — never silent loss. read still works afterwards for line-precise lookup.

Interactions

• Paperclip button: composer tool row (conversation.input.left), opens a multi-select file picker whose accept list covers every format in the table above.
• Drag & drop: drop a PDF / Office / text file anywhere on the page.
• Paste: copy a file and Ctrl+V into the composer (or the whole page).

Batches containing only native images or unsupported conversion formats (such as ZIP) pass through to the host unchanged. Mixed batches convert supported formats and attach images and remaining files to the original session through its native interface; documents stay as cards. There is no global synthetic-drop fallback.

Architecture

dsh-attachment-formats/
├── lib/
│   ├── index.js          # host half: POST /api/attach-formats/convert + engine routing
│   ├── client.js         # browser half: button/drop interception/scoped attachments/document cards/status bar
│   ├── cache.js          # workspace .dsh-attachments spill/manifest/INDEX.md/cleanup
│   ├── py/pymupdf4llm_convert.py  # venv high-fidelity engine (subprocess call)
│   └── convert/
│       ├── util.js       # magic-byte sniffing (pdf/tiff/OLE/rtf/zip), base64, truncation
│       ├── provider.js   # engine/binary detection (venv python, pandoc, LibreOffice) + subprocess bridges
│       ├── pdftext.js    # pdfjs text-layer extraction: line assembly/header-footer dedup/bookmark TOC
│       ├── outline.js    # md heading outline, JSON first-level key tree
│       ├── ocr.js        # tesseract.js OCR (traineddata download cache/confidence)
│       ├── pdf.js        # pdfjs-dist + @napi-rs/canvas → PNG/JPEG pages
│       ├── docx.js       # mammoth HTML → turndown+GFM → Markdown (tables preserved)
│       ├── xlsx.js       # exceljs → tab-separated text
│       ├── pptx.js       # jszip + a:t text runs → per-slide text
│       ├── tiff.js       # sharp (libvips) → PNG pages
│       ├── pandoc.js     # pandoc → Markdown + epub/odt zip fallback
│       └── libreoffice.js # legacy .doc/.xls/.ppt → modern OOXML
├── .venv/                # (optional) pymupdf4llm engine (generated by setup, not committed)
├── vendor/tessdata/      # OCR language-data cache (downloaded on first use, not committed)
├── docs/                 # design-longdoc.md / alternatives.md / upgrade-v6.md
├── scripts/smoke-*.mjs   # five offline smoke suites (converters/router/client/OCR/P0)
└── cordis.patch.yml

• The host route re-sniffs magic bytes and never trusts the client-declared kind; 160MB request cap and 64MB per-file cap; cwd is read by the client from session state and sent with the request (it decides where the spill lands).
• On dsh v0.1.2+, all exact plugin routes reuse the host connection's launch-token and Host/Origin checks; v0.1.1 keeps its legacy localhost trust boundary.
• Tiered thresholds: full-text merge cap 80k chars (v2b lowers it adaptively by context headroom); spill page images ≤100 pages (1100px wide; PNG over the per-image byte budget falls back to JPEG); scanned-page image cap follows the deployment limit; OCR ≤20 pages per run (2000px wide), confidence <45 falls back to page images.
• Resolve the service through ctx.get("conversation"). Converted images and native files use createDrafts(sessionId, files) + addAttachments(ids) on dsh 0.1.3+. Legacy image-only hosts use createDraftImages + addImages. Both target the conversation where intake started, even after navigation. Missing/rejected interfaces report an error; the plugin never broadcasts a synthetic drop. Batches with no convertible files pass through untouched; mixed batches convert supported formats and attach remaining files through the original session’s native pipeline.
• Document-card content merges at send time through the official composer write path (setDraft, phase-gated: plain drafts only, command claims are never polluted). Composer detection supports both the v0.1.1 textarea and the v0.1.2 Lexical contenteditable; the textarea DOM bridge remains an older-host fallback. The image path is fully independent and untouched.
• Conversion progress/errors show in a temporary status bar above the composer (conversation.input.dock); success auto-hides after 6s, errors can be dismissed.
• Page-image rendering targets the host's normalization byte budget (normalizationPolicy.maxBytes) instead of the raw admission bound, so rendered pages are not re-compressed a second time by the dsh ≥ v0.1.1 canonical image pipeline.

Quick install (dsh plugin)

Search: dsh attachment · dsh pdf · dsh office · dsh ocr · cordis pdf plugin — this plugin answers those queries.

From GitHub (recommended, dsh-plugin topic for discoverability):

dsh plugin --profile web add github:linkingoscar/dsh-attachment-formats

From npm (when published, enables keywords:dsh-plugin search):

dsh plugin --profile web add dsh-attachment-formats
# or
npm install dsh-attachment-formats

Local development:

cd path\to\dsh-attachment-formats
npm install            # host dependencies (first time)
# optional: high-fidelity PDF engine (pymupdf4llm, self-contained venv)
python -m venv .venv
.\.venv\Scripts\python.exe -m pip install pymupdf4llm
npm run smoke          # offline smoke tests (optional)
dsh plugin --profile web add link:path\to\dsh-attachment-formats

Restart dsh web (close the page → the desktop shortcut auto-restarts, or re-run dsh web) and refresh the browser. OCR language data downloads automatically on the first scanned-PDF recognition (≈24MB, cached in vendor/tessdata/, offline-ready afterwards).

Known limitations

• OCR (tesseract.js) quality is limited on low-resolution scans and complex tables; insufficient confidence falls back to page images with an explicit note — garbled text is never injected. Higher-quality OCR (RapidOCR/MinerU/PaddleOCR) can be added as pluggable backends later (see docs/upgrade-v6.md).
• The pymupdf4llm high-fidelity engine handles ≤40-page PDFs only (larger documents use the fast pdfjs engine); table/formula reconstruction is good but not typesetting-grade — layout details can be cross-checked against page images.
• Scanned PDFs without a text layer can only go the page-image route when OCR is unavailable or fails (vision models can read them).
• Legacy .doc/.xls/.ppt require LibreOffice (soffice); rtf requires pandoc; epub/odt work out of the box but pandoc (if installed) gives better fidelity. Missing binaries produce clear, actionable errors — nothing is silently dropped.
• DOCX formulas and embedded images are not extracted (tables, headings and text are).
• XLSX outputs displayed text/results only; charts and comments are not extracted.
• Outlines prefer bookmark TOCs; PDFs without bookmarks fall back to font-size heuristics (weak on documents without strong heading styling) — the index card still carries line/page counts and reading pointers.
• iWork and archives are not converted yet.
• Images, document cards, clipboard text and progress belong to the conversation where intake started. Switching conversations keeps each draft separate. Native attachments require a working per-session interface (dsh 0.1.1+ for images; 0.1.3+ for general files). Older hosts no longer receive synthetic drops.
• Draft merging uses the official input face, with a DOM bridge for older hosts. The card's send button dispatches Enter to the mounted native composer so its current queue/steer preference and upload gates apply. If a host changes its keymap, the merged content remains in the draft for native submission.

Releases

• v0.12.4 · 2026-09-28 — dsh v0.1.7-rc.2 compatibility: use the renamed IconPaperclipOutlineRegular export while retaining the older icon fallback. The compatibility gate renders the attachment button using the selected host's actual icon name, so missing icons can no longer hide behind a tooltip stub. Restart Harness after updating; existing settings and attachments are retained.

• v0.12.3 · 2026-09-20 — dsh v0.1.6-alpha.2 compatibility: uploads, paste/drop, send, removal and preview target their own conversation pane. Conversions retain their original session until completion, and plugin disable cancels uploads and releases references. If the original pane closes before a native attachment is ready, the plugin reports a retry instead of claiming a discarded draft succeeded. Adds multi-pane and disable/re-enable regression checks. Restart Harness after updating; no settings migration is required.

• v0.12.2 · 2026-09-11 — dsh v0.1.5-rc.2 compatibility: the card send button uses the native composer keymap, preserving busy queue/steer preferences and upload gates. DeepSeek OCR defaults to deepseek-flash; explicit model overrides remain valid. Compatibility checks inspect production source at the requested tag. All five smoke suites, type checking, lint and bundle consistency checks passed; the pandoc and LibreOffice cases were skipped because those optional tools were unavailable. Browser checks on a real 0.1.5-rc.2 host confirmed document-card submission, busy queuing and steering with a local mock model. Cloud OCR default selection and custom overrides were verified without paid API calls. Restart Harness after updating; no settings migration is required.

• v0.12.1 — compatibility with dsh v0.1.3-alpha.1: session-addressed createDrafts / addAttachments / releaseDraftAttachments; ZIP and other unsupported formats coexist with native upload, including mixed batches. Removes global-drop fallback, preserves cards/progress/clipboard text across session switches, and reports attachment rejection without claiming success. The browser bundle also isolates its globals for host reloads.

• v0.12.0 — raw binary uploads replace base64 JSON on the default client path; OOXML/epub/odt ZIP containers gain entry-count, per-entry, total-size and compression- ratio budgets; attachment supersession is isolated per session; credentials move to the host store before ordinary settings are written; automatic OCR no longer forwards one document to multiple cloud providers unless explicitly enabled.

• v0.11.1 — dsh v0.1.2-alpha.1 compatibility: Lexical composer detection and host launch-token/Host/Origin enforcement for plugin routes; v0.1.1 remains supported.

• v0.10.0 — Codex-parity UX + hardening: chunked upload progress (XHR) and a host-side job channel streaming per-page render/OCR progress into the status bar; card click opens a page-image lightbox (new path-traversal-guarded /api/attach-formats/file route); large-file base64 encoding moved into a Web Worker with sync fallback; secrets written through the official ctx.credentials.set seam (config keeps references, not values); doc-server URL SSRF guard (http/https only, no userinfo); verify:build freshness gate.

• v0.9.0 — dsh-philosophy alignment: conversion cache moves to $DSH_HOME/storages/attachment-docs/<workspaceHash>/ by default (workspace mode now opt-in; legacy cwd/.dsh-attachments auto-migrates once per workspace); DeepSeek Vision joins the auto OCR chain when a key is detected (toggleable, first transcription notes token billing); credentials resolve through the official ctx.credentials seam with file-parse fallback; settings gain revision CAS (expectedRevision → 409 on conflict) and a cache-location picker; smoke suites isolate DSH_HOME.

• v0.8.0 — settings page for all external APIs (no more required env): 8 OCR providers (Baidu / Aliyun AppCode / Tencent TC3 / Azure Document Intelligence / Volc / generic VLM / local tesseract.js / off) + 6 doc-parser presets (PaddleOCR / MinerU / Marker / Docling / custom / off), persisted under DSH_HOME with masked readback; zero-config DeepSeek Vision OCR (reuses the host's DeepSeek key, tables → GFM); vision provenance badges on chips; sharp/@napi-rs/canvas moved to optionalDependencies with three-state probes; .gitignore marker injection + /api/attach-formats/doctor.

• v0.7.0 — adaptation to dsh v0.1.x attachment pipeline: image limits resynced to the normalization-era defaults (20MiB/200MiB/64MP/8192px per side + maxImageDimension), page-image rendering now targets the host's normalizationPolicy.maxBytes budget; converted images attach through the official per-session injection face (createDraftImages + addImages, no more cross-conversation drops on v0.1.1+); document cards merge via the official setDraft write path (command claims never polluted); the cache settings page moves to the rc.7-standard settings.plugins.tab; /attach declares images: false and /attach full uses the agent.inject() alias; DOM bridge and synthetic drop remain as legacy-host fallbacks.

• v0.6.4 — session-correct attachments & verified zero-copy: attachments now attribute to the shell's current conversation (no more cards/images landing in another dialog); converted images wait for the current conversation to become idle before the synthetic drop; workspace zero-copy is confirmed by name + size + full SHA-256 (no silent substitution), >16MB is rejected outright; INDEX.md cells are escaped, INDEX rebuilds are serialized per workspace, cache hits keep the source-count fields, legacy-Office manifests carry the libreoffice+builtin engine label.

• v0.6.3 — cache lifecycle hardening: v0.6.1 8-hex cache dirs are now swept by cleanup/clear (no invisible orphans), JSON spill keeps source vs artifact sizes separate (tiering uses the spilled doc.* size), page images materialize lazily when a cache hit downgrades to index mode, INDEX.md is fully rebuilt from live manifests (no ghost rows, populated timestamps), legacy .doc/.xls/.ppt cache keys use the original OLE bytes so hits skip LibreOffice, atomic manifest/INDEX writes.

• v0.6.2 — cache correctness & fast path: 16-hex cache ids with full SHA-256 in the manifest, converter-policy fingerprint (engine/OCR/doc-server switches invalidate the cache), index cards rebuilt from structured metadata on every hit (no filename bleed-through), TTL counts model read access via file atime, page images rendered lazily (clean small PDFs skip rasterization), 2–16 MB text files reach the host spill instead of being rejected, React key warnings eliminated, Node >=20, CI actions upgraded to v7.

• v0.6.1 — correctness & engineering fixes: attachment-dock crash fix (useCallback reference), converters no longer pre-truncate (never-silent-truncation restored end-to-end), session-derived workspace authority for all routes, XLSX empty-column coordinate fix, true conversion cache keyed by source hash, cache TTL based on last access, verified merge into the composer draft; added ESLint, CI (Node 20/22) and component-level smoke tests.

• v0.6.0 — fidelity & format coverage (DOCX tables, TIFF, epub/odt/rtf, legacy Office, PDF bookmark outlines), Baidu OCR API + remote VLM OCR + external doc server, content-adaptive engine, attachment cache settings page, workspace zero-copy references.

• v0.5.0 — document cards, index-card spill, /attach list|full, adaptive merge limit, pymupdf4llm/pdfjs engines, tesseract.js OCR.

Model experience

Extracted text and OCR transcripts enter the model context only when the user sends the merged message (document cards) or reads the spilled doc.md via the read tool — the plugin itself submits nothing. Vision OCR (deepseek-flash or a configured cloud provider) is billed by that provider; the first transcription of a batch notes it in the card notes. Index cards carry absolute workspace paths (default cache home) or relative ones (workspace mode), so read/read_image resolve in both modes.

KV Cache effect

Conversion results are content-addressed and reused verbatim across sends (cache hits add zero new tokens beyond the index card itself). Switching engines/OCR providers changes the converter-policy fingerprint and invalidates old caches, so a provider swap re-transcribes on the next drop rather than serving stale text.

FAQ — search-friendly

Q: How to add PDF support to DeepSeek Harness Web? dsh plugin --profile web add github:linkingoscar/dsh-attachment-formats — PDFs extract text-layer (pymupdf4llm/pdfjs), scanned PDFs OCR via tesseract/DeepSeek Vision, long docs spill to index cards.

Q: Does it work with Office (docx/xlsx/pptx) and TIFF/epub? Yes — docx tables → Markdown pipes, xlsx → TSV, pptx → per-slide text, TIFF → PNG, epub/odt → Markdown via pandoc/jszip.

Q: What about dsh file-upload vs drag-and-drop? This plugin is an alternative to dsh-drag-and-drop/dsh-at-file/dsh-file-uploads: it converts content (not just paths) so text-models can read PDFs; zero-copy via SHA-256 for workspace files keeps uploads low.

Q: Which OCR backends? auto selects the first configured cloud backend in the Baidu → VLM → Aliyun/Tencent/Azure/Volc → DeepSeek order, then falls back locally; cross-cloud retry is opt-in. All backends are optional and no heavyweight model is bundled.

Q: Where are docs cached? DSH_HOME/storages/attachment-docs/<wsHash>/ (default), opt-in workspace mode .dsh-attachments/, 7-day TTL, INDEX.md + read/read_image.

Related / discovery

• Add the dsh-plugin topic to your plugin repo for discoverability (per deepseek-harness README).
• Curated lists: awesome-dsh-plugin, dshplugin.world, deepseekharness.io/plugins, dsh.pub — PRs welcome; this plugin declares dsh.bundle so it qualifies for manifest-verified discovery.
• Keywords: dsh, dsh-plugin, deepseek-harness, cordis, pdf-extraction, office, tiff, ocr, tesseract, deepseek-vision.

Known limitations

• The DeepSeek key file fallback parses .credentials.yaml with a minimal regex; if the host's credential format changes, the plugin falls back to local tesseract with a warning (the official ctx.credentials seam is tried first).
• auto Vision requires a detectable DeepSeek key; without one it silently skips to local OCR (explicit deepseek mode reports the reason instead).
• Legacy .doc/.xls/.ppt need LibreOffice; rtf needs pandoc; heavy parsers (MinerU/Marker/PaddleOCR) are external services only — never bundled.
• iWork and archives are not converted.

License

Apache-2.0 © 2026 linkingoscar

2026-09-30 compatibility verification (unreleased)

Verified against official Harness 0.2.0-rc.2 (developer prerelease; commit 639ed015397290b3745d163aafe02ffee4aa3f84), including source contracts, existing composer/session behavior tests, and authenticated upload/conversion plus unauthenticated rejection on a real linked-plugin host. This is not a full browser visual audit. Existing CI compatibility tags are retained and the new release is added.

PPTX extraction now follows presentation.xml relationships rather than storage filenames, excludes orphan slides and rejects broken references. ODT fallback preserves interleaved headings/paragraphs and heading levels. EPUB fallback follows the OPF spine instead of sorted filenames; auxiliary/nonlinear and navigation documents are excluded. Broken/missing metadata or unsupported spine media produce an explicit error. Package metadata is parsed namespace-aware without DTD/entity expansion or external resource fetching. Run npm run test:document-order for targeted regressions. The EPUB pandoc smoke fixture now contains a valid OPF package rather than incorrectly pointing its container at XHTML.

Optional Python-engine/OCR language-data tests can skip when those dependencies are absent; a successful offline suite is not evidence that those optional backends were exercised.

Small follow-up: PDF text coverage

PDFs with both extracted text and textless pages now carry explicit page coverage and a source-review warning in direct text, index cards and cache hits. Document chips show “待核对” for those gaps. Textless may mean blank, scanned or graphical; text on every page does not prove complete chart/formula/layout extraction. The existing cache and preview system is reused. See focused roadmap.