Create Rich Text Editor Custom Node
getlago/lago-front
Create a new custom TipTap node for the Rich Text Editor that works in edit mode, on-screen preview, and PDF download.
A skill your agent uses when changing Trilium's built-in PDF viewer — anything under packages/pdfjs-viewer (the code injected into Mozilla's PDF.js viewer: bootstrap.ts, annotations.ts, pages.ts…
Install Developing PDF Viewer
$ npx skills add TriliumNext/Trilium --skill developing-pdf-viewer -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install TriliumNext/Trilium developing-pdf-viewer --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/TriliumNext/Trilium.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/developing-pdf-viewer .claude/skills/developing-pdf-viewer && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "developing-pdf-viewer" agent skill from https://github.com/TriliumNext/Trilium/tree/main/.claude/skills/developing-pdf-viewer into .claude/skills/developing-pdf-viewer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "developing-pdf-viewer", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/TriliumNext/Trilium/tree/main/.claude/skills/developing-pdf-viewerType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add TriliumNext/Trilium --skill developing-pdf-viewer -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install TriliumNext/Trilium developing-pdf-viewer --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/TriliumNext/Trilium.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/developing-pdf-viewer .agents/skills/developing-pdf-viewer && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "developing-pdf-viewer" agent skill from https://github.com/TriliumNext/Trilium/tree/main/.claude/skills/developing-pdf-viewer into .agents/skills/developing-pdf-viewer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "developing-pdf-viewer", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add TriliumNext/Trilium --skill developing-pdf-viewer -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install TriliumNext/Trilium developing-pdf-viewer --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/TriliumNext/Trilium.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/developing-pdf-viewer .cursor/skills/developing-pdf-viewer && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "developing-pdf-viewer" agent skill from https://github.com/TriliumNext/Trilium/tree/main/.claude/skills/developing-pdf-viewer into .cursor/skills/developing-pdf-viewer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "developing-pdf-viewer", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/TriliumNext/Trilium.git --path .claude/skills/developing-pdf-viewer--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add TriliumNext/Trilium --skill developing-pdf-viewer -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install TriliumNext/Trilium developing-pdf-viewer --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/TriliumNext/Trilium.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/developing-pdf-viewer .gemini/skills/developing-pdf-viewer && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "developing-pdf-viewer" agent skill from https://github.com/TriliumNext/Trilium/tree/main/.claude/skills/developing-pdf-viewer into .gemini/skills/developing-pdf-viewer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "developing-pdf-viewer", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install TriliumNext/Trilium developing-pdf-viewerInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add TriliumNext/Trilium --skill developing-pdf-viewer -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/TriliumNext/Trilium.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/developing-pdf-viewer .github/skills/developing-pdf-viewer && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "developing-pdf-viewer" agent skill from https://github.com/TriliumNext/Trilium/tree/main/.claude/skills/developing-pdf-viewer into .github/skills/developing-pdf-viewer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "developing-pdf-viewer", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add TriliumNext/Trilium --skill developing-pdf-viewer -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install TriliumNext/Trilium developing-pdf-viewer --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/TriliumNext/Trilium.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/developing-pdf-viewer .opencode/skills/developing-pdf-viewer && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "developing-pdf-viewer" agent skill from https://github.com/TriliumNext/Trilium/tree/main/.claude/skills/developing-pdf-viewer into .opencode/skills/developing-pdf-viewer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "developing-pdf-viewer", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
developing-pdf-viewer- GitHub stars
- 38k
- Token cost
- ~1.8k tokens
- SKILL.md length
- 815 words
- Files
- 1
- Skills in repo
- 22
- Repo updated
- First seen
- Licence
- AGPL-3.0
At a glance
A skill your agent uses when changing Trilium's built-in PDF viewer — anything under packages/pdfjs-viewer (the code injected into Mozilla's PDF.js viewer: bootstrap.ts, annotations.ts, pages.ts…
- Changing Triliums built-in PDF viewer — anything under packages/pdfjs-viewer (the code injected into Mozillas PDF.js viewer: bootstrap.ts
- SKILL.md covers Rebuild the viewer after every…, The message protocol, The viewer outlives the note… and pdf.js timing traps, plus 1 more section
- Calls pnpm
- The client side that talks to it (apps/client/src/widgets/typewidgets/file/Pdf.tsx
What it does
Developing PDF Viewer is an agent skill from TriliumNext/Trilium. Use when changing Trilium's built-in PDF viewer — anything under packages/pdfjs-viewer (the code injected into Mozilla's PDF.js viewer: bootstrap.ts, annotations.ts, pages.ts, toc.ts, layers.ts, attachments.ts, persistence.ts, editing.ts), the client side that talks to it (apps/client/src/widgets/typewidgets/file/Pdf.tsx, PdfViewer.tsx, the sidebar panels in widgets/sidebar/pdf/), the postMessage protocol between them, PDF links (?page= / ?annotation=), or a bug where the viewer "does not pick up" a change…
Its SKILL.md is about 1.8k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Documents & Office, covering PDF and React components. It works with pnpm. The repository describes itself as: Build your personal knowledge base with Trilium Notes. The licence is AGPL-3.0.
When your agent uses it
- Changing Triliums built-in PDF viewer — anything under packages/pdfjs-viewer (the code injected into Mozillas PDF.js viewer: bootstrap.ts
- The client side that talks to it (apps/client/src/widgets/typewidgets/file/Pdf.tsx
- The sidebar panels in widgets/sidebar/pdf/)
- The postMessage protocol between them
Example prompts
- “does not pick up”
- “/developing-pdf-viewer”
What it can do on your machine
Read from SKILL.md and the folder at commit cac2b4f. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
pnpm
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use pnpm, which can reach the network depending on how they are called.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Developing PDF Viewer loads about 1.8k tokens when it runs. Until then it costs about 182 tokens; SKILL.md has 815 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from TriliumNext/Trilium at commit cac2b4f, republished under its AGPL-3.0 licence (© TriliumNext). 815 words, ~1,792 tokens.
Download SKILL.mdSave it as
.claude/skills/developing-pdf-viewer/SKILL.md (or your agent's skills folder).- name
- developing-pdf-viewer
- description
- Use when changing Trilium's built-in PDF viewer — anything under `packages/pdfjs-viewer` (the code injected into Mozilla's PDF.js viewer: `bootstrap.ts`, `annotations.ts`, `pages.ts`, `toc.ts`, `layers.ts`, `attachments.ts`, `persistence.ts`, `editing.ts`), the client side that talks to it (`apps/client/src/widgets/type_widgets/file/Pdf.tsx`, `PdfViewer.tsx`, the sidebar panels in `widgets/sidebar/pdf/`), the postMessage protocol between them, PDF links (`?page=` / `?annotation=`), or a bug where the viewer "does not pick up" a change. Covers the mandatory rebuild after every viewer change, the message protocol, the hidden-but-mounted viewer, the pdf.js timing traps, and how to test at each level.
Developing the PDF viewer
A PDF note renders in an iframe running Mozilla's PDF.js viewer, vendored in
packages/pdfjs-viewer/viewer/ (viewer.mjs, viewer.html, refreshed by pnpm --filter @triliumnext/pdfjs-viewer update-viewer) plus Trilium's own code in packages/pdfjs-viewer/src/,
bundled into web/custom.mjs. The client never imports that code: Pdf.tsx and the viewer talk
only through postMessage.
Rebuild the viewer after every change to it
After any edit under packages/pdfjs-viewer/ (src/, viewer/, scripts/), run the build
before testing anything in an app:
pnpm --filter @triliumnext/pdfjs-viewer buildEvery app serves the built packages/pdfjs-viewer/dist, never the sources: the server in
development (getPdfjsAssetDir() in apps/server/src/routes/assets.ts), desktop, and standalone
(apps/standalone/vite.config.mts). dist is built only by the root prepare script, i.e. on
pnpm install; pnpm server:start and the other *:start scripts do not rebuild it and do not
watch it. Vite hot-reloads the client half of a change while the viewer half stays at whatever was
built last, so a stale dist looks exactly like a bug in the new code — or like a fix that works,
when the old viewer happens to behave. Check the age when in doubt:
ls -l --time-style=+%H:%M packages/pdfjs-viewer/dist/web/custom.mjs- For a longer session,
pnpm --filter @triliumnext/pdfjs-viewer watchrebuildscustom.mjson save. Then reload the app page: the iframe loads the viewer afresh with the note. - The viewer's own Playwright suite (
pnpm --filter @triliumnext/pdfjs-viewer e2e) builds before serving, butreuseExistingServerkeeps a harness server that is already running — and its stale bundle — outside CI. - The unit specs (
pnpm --filter @triliumnext/pdfjs-viewer test) import the sources directly and need no build. Green specs therefore say nothing about what an app serves. - When reporting a viewer change done, say that
distwas rebuilt, so the user's running instance picks it up on reload.
The message protocol
- Viewer → client:
pdfjs-viewer-*messages, typed inapps/client/src/types-pdfjs.d.ts(PdfMessageEvent). Every message carriesnoteIdandntxId(from the iframe URL, set inbootstrap.ts), andPdf.tsxdrops any message not addressed to its own note and context, because every viewer posts to the same parent window. - Client → viewer:
trilium-*messages, posted toiframeRef.current.contentWindow; the viewer checksevent.origin. They are not typed on the viewer side. Pdf.tsxturns the viewer's data into note-context data (toc,pdfPages,pdfAnnotations,pdfAttachments,pdfLayers), which the right sidebar panels read withuseGetContextData(). Write it throughpublish(), notnoteContext.setContextData()— see below.- Most setup runs on pdf.js
documentloadedand only when the note is editable (bootstrap.ts);setupPdfAnnotations()runs for read-only PDFs too. The firstpdfjs-viewer-annotationsmessage is the client's signal that the viewer can scroll.
The viewer outlives the note it shows
NoteDetailWrapper keeps each type widget mounted, hidden, while the pane shows a note of another
type, so a PDF → text note → same PDF round trip reuses the iframe with its document loaded. Two
consequences:
NoteContext.setNote()clears the context data on the way out, and the viewer never sends it again.Pdf.tsxkeeps what it last received per key and republishes it whenisVisibleturns true; anything new published while hidden is recorded, not written.- Anything that scrolls must wait for
isVisible: a hidden viewer throws "offsetParent is not set -- cannot scroll" and the scroll is lost.noteSwitchedreaches the hidden viewer before it is shown.
Show full SKILL.md (303 more words)Show less
pdf.js timing traps
- The initial view undoes an early scroll. pdf.js restores the last-read position at
documentinitand, for pages of unequal size, again afterpagesPromise.trackInitialView()inannotations.tsmakesscrollToAnnotation()wait for both. - A resize scrolls back to the recorded position.
onResize()reapplies anauto,page-fitorpage-widthzoom and#setScaleUpdatePages()scrolls to_location, which pdf.js records inpdfViewer.update()on the next frame's scroll event. A viewer shown again resizes, often in the same frame as a jump. After a programmatic scroll, callpdfViewer.update()and scroll instantly, never smoothly. - An annotation's element is not a reliable target. Pages render only near the viewport, and
while an annotation tool is active pdf.js hides each editable annotation's element behind an
editor. Position from the rectangle (
page.getAnnotations(), orannotationStorage.serializablefor what was edited in this session) throughpageView.viewport.convertToViewportPoint(); pdf.js 6 has noconvertToViewportRectangle(). - Ids drawn this session are temporary. A stored annotation's id is its object reference
(
12R); one drawn since the document loaded has an editor id (pdfjs_internal_editor_N) that the next load does not reuse.
Testing
| Level | What | Command |
|---|---|---|
| Viewer unit | src/*.spec.ts against real pdf.js and a thin PDFViewerApplication (src/test/viewer_app.ts, fixture PDF in src/test/fixture_pdf.ts) | pnpm --filter @triliumnext/pdfjs-viewer test --run |
| Client unit | Pdf.spec.tsx (the protocol, with PdfViewer mocked), sidebar panel specs | pnpm --filter client test src/widgets/type_widgets/file/Pdf.spec.tsx src/widgets/sidebar/pdf/ |
| Viewer e2e | built bundle + a stub parent (e2e/harness) | pnpm --filter @triliumnext/pdfjs-viewer e2e |
| App | in-memory e2e fixture with Dacia Logan.pdf (oUfFD9lugwiQ) and Layers test.pdf (n7gU3aBDPKd9) | see building-client-ui → references/inspecting-the-running-app.md — rebuild dist first |
A timing bug (a jump undone, a panel empty after navigation) usually passes in a fast headless
run. Instrument the iframe (contentWindow resize listener, PDFViewerApplication.pdfViewer
_location / currentScale, a wrapped postMessage) to read the order of events, then force the
losing order in the repro — for example resize the iframe right after the client posts — before
trusting a fix.
© TriliumNext, AGPL-3.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in .claude/skills/developing-pdf-viewer of TriliumNext/Trilium.
Open the folder on GitHubat commit cac2b4f
Compare with similar skills
Developing PDF Viewer next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Developing PDF Viewer this skillTriliumNext/Trilium | 38k | — | ~1.8k | Automated safety check: Pass | AGPL-3.0 | |
| Create Rich Text Editor Custom Nodegetlago/lago-front | 163 | — | ~2k | Automated safety check: Notes | AGPL-3.0 | |
| Build With SimplepdfSimplePDF/simplepdf-embed | 407 | — | ~7k | Automated safety check: Pass | MIT | |
| React PDFtrailofbits/skills-curated | 512 | — | ~3.1k | Automated safety check: Notes | CC-BY-SA-4.0 | |
| MarkitdownImCa0/just-laws | 781 | 14 repos | ~3.2k | Automated safety check: Notes | MIT | |
| Gzh Designisjiamu/gzh-design-skill | 3.9k | 1 repos | ~2.2k | Automated safety check: Pass | AGPL-3.0 |
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Questions about Developing PDF Viewer
What does Developing PDF Viewer do?
A skill your agent uses when changing Trilium's built-in PDF viewer — anything under packages/pdfjs-viewer (the code injected into Mozilla's PDF.js viewer: bootstrap.ts, annotations.ts, pages.ts…. Developing PDF Viewer is an agent skill from TriliumNext/Trilium.
When should I use Developing PDF Viewer?
Developing PDF Viewer fits situations like: changing Triliums built-in PDF viewer — anything under packages/pdfjs-viewer (the code injected into Mozillas PDF.js viewer: bootstrap.ts; the client side that talks to it (apps/client/src/widgets/typewidgets/file/Pdf.tsx; the sidebar panels in widgets/sidebar/pdf/); the postMessage protocol between them.
How do I install Developing PDF Viewer in Claude Code?
Run `npx skills add TriliumNext/Trilium --skill developing-pdf-viewer -a claude-code`. Or copy the skill folder (.claude/skills/developing-pdf-viewer in TriliumNext/Trilium) into .claude/skills/developing-pdf-viewer in your project. Claude Code loads it when a task matches its description.
How do I install Developing PDF Viewer in Codex?
Run `npx skills add TriliumNext/Trilium --skill developing-pdf-viewer -a codex`. Or copy the skill folder (.claude/skills/developing-pdf-viewer in TriliumNext/Trilium) into .agents/skills/developing-pdf-viewer in your project. Codex loads it when a task matches its description.
Can I use Developing PDF Viewer in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add TriliumNext/Trilium --skill developing-pdf-viewer -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/developing-pdf-viewer, .gemini/skills/developing-pdf-viewer, .github/skills/developing-pdf-viewer and .opencode/skills/developing-pdf-viewer in your project.
What does Developing PDF Viewer need to run?
Going by SKILL.md and its folder, Developing PDF Viewer needs the command-line tools its instructions call (pnpm).
Does Developing PDF Viewer access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Developing PDF Viewer safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Developing PDF Viewer use?
Developing PDF Viewer is published under the AGPL-3.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Developing PDF Viewer use?
About 1.8k tokens (SKILL.md is roughly 7.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Developing PDF Viewer?
Skills that share tags, products or a category with Developing PDF Viewer: Create Rich Text Editor Custom Node (getlago/lago-front, 163 stars), Build With Simplepdf (SimplePDF/simplepdf-embed, 407 stars), React PDF (trailofbits/skills-curated, 512 stars) and Markitdown (ImCa0/just-laws, 781 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Developing PDF Viewer?
TriliumNext (a GitHub organization) maintains it in TriliumNext/Trilium, which has 38,248 GitHub stars. The repository holds 22 skills in this directory. The repository was last updated on October 8, 2026.
Source: TriliumNext/Trilium on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.