Vellum Assistant is a personal AI assistant that remembers information about users, learns their preferences, and takes actions across connected apps. It is intended for people who want an assistant that can manage conversations, unfinished work, and proactive notifications over time. The catalogue skills, hooks, instruction, and setting configure or extend how the assistant works.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add vellum-ai/vellum-assistant --skill document-editorgit clone --depth 1 https://github.com/vellum-ai/vellum-assistantWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/vellum-ai/vellum-assistant/document-editor)<a href="https://agentmods.dev/skills/vellum-ai/vellum-assistant/document-editor"><img src="https://agentmods.dev/badge/skills/vellum-ai/vellum-assistant/document-editor.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00056 | $0.02355 |
| Opus 5 | $0.00028 | $0.01177 |
| Sonnet 5 | $0.00011 | $0.00471 |
| Haiku 4.5 | $0.00006 | $0.00235 |
Grade A, and why
document-editor scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 135 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Write and edit long-form documents using the built-in rich text editor. Documents open in workspace mode with chat docked to the side. When a request is about writing prose (an article, blog post, report, essay, story, or similar), create it here rather than writing it into the chat response.
Tools
- document_create - Opens a new document editor with an optional title and initial Markdown content. Returns a
surface_idfor subsequent updates. This is the entry point for any new piece of writing. - document_update - Updates content in an open document editor by
surface_id. Supportsreplace(overwrite) andappend(add to end) modes. - document_read - Reads the current content of a document by
surface_idwhen it belongs to the current conversation, or when the current actor is the guardian/local user. Use to verify content before editing. - document_find - Searches a document for text or regex patterns. Returns matching lines with line numbers, match positions, and matched text.
- document_replace_text - Targeted find-and-replace within a document. Supports literal and regex patterns (with backreferences). Optionally limit the number of replacements.
- document_list - Lists documents. Without
query, lists the current conversation's documents. Withquery, searches by title; guardian/local users can search across conversations, while other actors are scoped to the current conversation. - document_open - Opens an existing document in the editor panel by
surface_id. Use this when a document exists but isn't visible in the editor — for example after the user switches devices, refreshes the page, or when the editor panel was closed. Fetches the document from storage and sends it to the client. - document_delete - Deletes a document by
surface_id. Use to clean up unwanted documents.
Creating a new document
This is the default path when the user asks you to write something.
- Create the document: Call
document_createwith a title (inferred from the request). Call the tool immediately, not after conversational preamble. Anything you pass asinitial_contentis saved right then, so the firstdocument_updatemust start with the next chunk rather than repeating it. - Write content in Markdown: Use proper structure (
#for titles,##for sections), bold, italic, code blocks, tables, lists, blockquotes as appropriate. - CRITICAL - Stream content in chunks: Call
document_updateMULTIPLE times, not just once. Break content into logical chunks (paragraphs, sections, or every 200-300 words). Calldocument_updatewithmode: "append"for EACH chunk separately. Each append carries ONLY that chunk: content already in the document is committed, and resending it would print it twice. When you are streaming into the document you just created,surface_idis optional: omit it and pass onlycontent, and the update targets that document. The user experiences real-time content appearing as you write.
What ships with it
12 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- TOOLS.json 9.6 KB
- tools/comment-list.ts 346 B runs code
- tools/comment-reply.ts 348 B runs code
- tools/comment-resolve.ts 352 B runs code
- tools/document-create.ts 344 B runs code
- tools/document-delete.ts 344 B runs code
- tools/document-find.ts 340 B runs code
- tools/document-list.ts 340 B runs code
- tools/document-open.ts 340 B runs code
- tools/document-read.ts 340 B runs code
- tools/document-replace-text.ts 354 B runs code
- tools/document-update.ts 344 B runs code
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 8d ago First seen · 135 lines · 56 tokens per session scan A 2932aab14bc1
document-editor is a skill published in the GitHub repository vellum-ai/vellum-assistant (1,204 stars, last pushed today), licensed MIT. It adds 56 tokens to every session and 2,355 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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