BitFun is a desktop AI agent that turns tasks into interactive mini-apps while also writing code, creating documents, and controlling computers. It is for software development and general desktop work across Windows, macOS, and Linux. Its catalogue entries extend the agent with skills, agents, and instructions.
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 GCWing/BitFun --skill docs-canvasgit clone --depth 1 https://github.com/GCWing/BitFunWrote 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/gcwing/bitfun/docs-canvas)<a href="https://agentmods.dev/skills/gcwing/bitfun/docs-canvas"><img src="https://agentmods.dev/badge/skills/gcwing/bitfun/docs-canvas/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/gcwing/bitfun/docs-canvas"><img src="https://agentmods.dev/badge/skills/gcwing/bitfun/docs-canvas.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00087 | $0.00627 |
| Opus 5.5 | $0.00035 | $0.00251 |
| Sonnet 5.5 | $0.00017 | $0.00125 |
| Haiku 4.5 | $0.00009 | $0.00063 |
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 1mo 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 — 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 openbitfun-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:
- Overview — A short summary card with the purpose of the doc, scope, and audience.
- Table of contents — Navigable list of sections, ideally pinned or sticky so the reader can jump around.
- Body sections — One section per logical unit (architecture, API, examples, gotchas). Each section can mix prose, code blocks, diagrams, and callouts.
- 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.
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.
- 1mo ago Changed · +1 tokens per session d4bd2ca477d7
- 1mo ago First seen · 55 lines · 86 tokens per session scan A bd49ac10341c
docs-canvas is a skill published in the GitHub repository GCWing/BitFun (2,077 stars, last pushed 1mo ago), licensed MIT. It adds 87 tokens to every session and 627 once invoked, about $0.0003 per session on Opus 5.5. 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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