sb-author

sb-author is a skill for Claude Code, Codex from stablebaseline/mcp. It costs 117 tokens per session (2,158 once invoked), scanned A, original, MIT.

A document-writing tool for Stable Baseline, a system that stores editable documents in an extended form of Markdown and imports external files.

In plain words
What is it for?
Use it to create, edit, rename, move, or import documents from PDF, Word, text, or Markdown files.
Why use it?
It helps create or update documents in the correct project and format while respecting the signed-in user’s permissions.

Skill for Claude CodeCodex

Install

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.

agentmods
npx agentmods add skills/stablebaseline/mcp/sb-author
Any agent
npx skills add stablebaseline/mcp --skill sb-author
Clone the repo
git clone --depth 1 https://github.com/stablebaseline/mcp

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for sb-author

README.md
[![agentmods](https://agentmods.dev/badge/skills/stablebaseline/mcp/sb-author.svg)](https://agentmods.dev/skills/stablebaseline/mcp/sb-author)
Your own site
<a href="https://agentmods.dev/skills/stablebaseline/mcp/sb-author"><img src="https://agentmods.dev/badge/skills/stablebaseline/mcp/sb-author.svg" alt="Measured on agentmods" height="20"></a>
Per session 117 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,158 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00117 $0.02158
Opus 5 $0.00059 $0.01079
Sonnet 5 $0.00023 $0.00432
Haiku 4.5 $0.00012 $0.00216

Measured 3d ago against content hash 6e0c21e46dce, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

sb-author 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 3d 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.

microsoft/cowork-plugin/skills/sb-author/SKILL.md · 185 lines

How it starts

The opening of the file, as written. The whole thing — 185 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Stable Baseline: author documents

What this skill does

Creates and edits living documents in CDMD, a Markdown superset, and brings external files in as documents. Every change runs under the signed in user's own Stable Baseline identity and inherits their exact permissions.

IDs are never hardcoded. Resolve projectId, folderId and documentId at runtime from listing calls made in this conversation.

Before you write anything

  1. Resolve scope. listOrganisations, listWorkspaces, listProjects. If several workspaces or projects are accessible, ask which one. Never guess where a document should live.
  2. Check whether it already exists. Run listDocuments with a query before creating. Duplicating an existing document is a common and annoying failure. If a close match exists, show it and ask whether to edit that or create a new one.
  3. Learn the format once per session. Call getCdmdLanguageGuide before your first create or edit if you have not already. CDMD is not plain Markdown and guessing the block syntax produces broken documents.

Creating a document

createDocument requires projectId. It also accepts folderId, title, cdmd, position and changeSummary.

  • Always set a meaningful title.
  • Always set changeSummary. It appears in version history and is how colleagues understand what an agent did.
  • Place it deliberately. Ask for the folder if the project has several and the user has not said. createFolder, updateFolder, listFolders and getFolderHierarchy manage the tree; reorderDocuments and reorderFolders change display order.

Editing a document

editDocument is the preferred tool for targeted changes. It requires documentId and supports two patch dialects that must not be mixed in one call.

Anchor patches, recommended. {oldText, newText, before?, after?}.

  • oldText must match the document byte for byte and be unique.
  • If it occurs more than once, expand oldText until unique, or add before or after with the exact adjacent text.
  • A no-match returns nearby context. An ambiguous match returns the occurrence count. Read the error and fix the anchor rather than retrying blindly.
  • newText: "" deletes the anchored text.
  • Anchors do not drift and survive concurrent edits, so no fresh line numbers are needed.
  • The text field in listDocuments contentMatches is anchor-ready. Paste it straight in as oldText.

Read the full file on GitHub · 185 lines

Changes

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.

  1. 3d ago First seen · 185 lines · 117 tokens per session scan A 6e0c21e46dce

Subscribe to this mod's changes

sb-author is a skill published in the GitHub repository stablebaseline/mcp (0 stars, last pushed 8d ago), licensed MIT. It adds 117 tokens to every session and 2,158 once invoked, about $0.0006 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 2026-08-31.

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