docs-canvas

A navigable documentation canvas for organizing architecture notes, API references, walkthroughs, runbooks, and how-to guides. An API is a way for software components to communicate, while a runbook is a procedure for handling a task or incident.

In plain words
What is it for?
Presenting documentation with sections, a table of contents, diagrams, code examples, and links between related topics, where those capabilities are implemented.
Why use it?
It gives related technical information a structured place with navigation and cross-references. The supplied description is a placeholder, so its complete behavior is not defined.

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/gcwing/bitfun/docs-canvas
Any agent
npx skills add GCWing/BitFun --skill docs-canvas
Clone the repo
git clone --depth 1 https://github.com/GCWing/BitFun

Made for: Claude Code, Codex.

Per session 86 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 625 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 $0.00086 $0.00625
Opus 5 $0.00043 $0.00313
Sonnet 5 $0.00017 $0.00125
Haiku 4.5 $0.00009 $0.00063

Measured 2d ago against content hash bd49ac10341c, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

docs-canvas 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 2d 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.

src/crates/assembly/core/builtin_skills/docs-canvas/SKILL.md · 55 lines

How it starts

The opening of the file, as written. The whole thing — 55 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Docs Canvas

Build a canvas that presents documentation — architecture notes, API references, design docs, runbooks, or codebase walkthroughs — as an interactive, navigable surface rather than as a flat markdown file.

Status: placeholder. The skill structure is in place so the canvas welcome page can surface this plugin via the marketplace query, but the full skill body still needs to be written. Treat the steps below as a starting outline and refine as the docs canvas pattern matures.

Prerequisites

Read bitfun-canvas first. It contains the generation policy, design guidance, slop rules, self-check, Canvas runtime rules, and SDK usage notes.

Gather the source material

Accept any of: a directory of markdown files, a single doc URL, an inline outline, or a question to answer from the codebase. Collect headings, code blocks, diagrams, and any cross-references between documents.

Plan the canvas layout

Decide the top-level structure before writing any components. A docs canvas usually has:

  1. Overview — A short summary card with the purpose of the doc, scope, and audience.
  2. Table of contents — Navigable list of sections, ideally pinned or sticky so the reader can jump around.
  3. Body sections — One section per logical unit (architecture, API, examples, gotchas). Each section can mix prose, code blocks, diagrams, and callouts.
  4. References — Links to related docs, source files, RFCs, and external material.

Render with canvas primitives

Prefer built-in canvas components over raw HTML:

  • Use cards/sections to group related content visually.
  • Use code blocks with syntax highlighting for snippets.
  • Use diagrams (DAG layout, mermaid) for architecture.
  • Use callouts for "Important", "Warning", "Note", "Deprecated".
  • Use tables for API parameter lists and option matrices.

Tone and content

Write reader-facing prose. Lead with the answer or the headline, then explain. Keep examples small and runnable. Cite source files with code references so readers can jump in.

Read the full file on GitHub · 55 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. 2d ago First seen · 55 lines · 86 tokens per session scan A bd49ac10341c

Subscribe to this mod's changes

docs-canvas is a skill published in the GitHub repository GCWing/BitFun (1,871 stars, last pushed 2d ago), licensed MIT. It adds 86 tokens to every session and 625 once invoked, about $0.0004 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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