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 gstack-qa-onlygit 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/gstack-qa-only)<a href="https://agentmods.dev/skills/gcwing/bitfun/gstack-qa-only"><img src="https://agentmods.dev/badge/skills/gcwing/bitfun/gstack-qa-only/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/gstack-qa-only"><img src="https://agentmods.dev/badge/skills/gcwing/bitfun/gstack-qa-only.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Anti-Refusal · line 352 Skill instructs the agent to never refuse or to always comply. Suppressing the agent's ability to decline removes a core safety control and enables downstream harmful requests to succeed.Fix: Remove any instruction telling the agent to never refuse or always comply. The agent must retain the ability to decline unsafe, out-of-scope, or harmful requests.
- medium Excessive Agency · line 55 Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
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 | $0.00111 | $0.04439 |
| Opus 5.5 | $0.00044 | $0.01776 |
| Sonnet 5.5 | $0.00022 | $0.00888 |
| Haiku 4.5 | $0.00011 | $0.00444 |
Grade C, and why
qa-only scanned grade C with 2 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.
Tells the agent never to refusehighAnti-refusal
Suppressing the ability to decline removes a core safety control; a later harmful request then succeeds.
12. **Never refuse to use the browser.** When the user invokes /qa or /qa-only, they are requesting browser-based testing. Never suggest evals, unit tests, or other alternatives as a substitute. Even if the diff appears Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
agent-browser cookies set --curl cookies.json How it starts
The opening of the file, as written. The whole thing — 414 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/qa-only: Report-Only QA Testing
You are a QA engineer. Test web applications like a real user — click everything, fill every form, check every state. Produce a structured report with evidence. NEVER fix anything.
OpenBitFun Dispatch
When this skill is invoked by OpenBitFun, this skill supplies the report-only QA methodology. Use existing Task sub-agents for independent testing tracks, and never ask them to mutate files.
- Do not assume a QA Reporter sub-agent exists. Choose only from the Task tool's available agents.
- Prefer a matching custom QA/browser sub-agent if available; otherwise use agent-browser for browser testing,
ComputerUseonly for native desktop UI, andExplorefor diff-aware test-scope mapping. - Split independent QA tracks into parallel Task calls when useful: smoke, changed-flow regression, accessibility/keyboard, error states, and data persistence.
- Require every Task result to include repro steps, expected vs actual behavior, evidence paths/screenshots when available, severity, and confidence.
- The main session consolidates duplicates and decides what blocks Ship.
Setup
Parse the user's request for these parameters:
| Parameter | Default | Override example |
|---|---|---|
| Target URL | (auto-detect or required) | https://myapp.com, http://localhost:3000 |
| Mode | full | --quick, --regression .openbitfun/team/qa-reports/baseline.json |
| Output dir | .openbitfun/team/qa-reports/ |
Output to /tmp/qa |
| Scope | Full app (or diff-scoped) | Focus on the billing page |
| Auth | None | Sign in to [email protected], Import cookies from cookies.json |
If no URL is given and you're on a feature branch: Automatically enter diff-aware mode (see Modes below). This is the most common case — the user just shipped code on a branch and wants to verify it works.
Browser/desktop QA tooling: Use agent-browser for browser QA and OpenBitFun ComputerUse only for native desktop surfaces it cannot reach. Save QA artifacts under .openbitfun/team/qa-reports/.
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 509b4561c328
- 1mo ago First seen · 414 lines · 111 tokens per session scan C b54128d7a060
qa-only is a skill published in the GitHub repository GCWing/BitFun (2,077 stars, last pushed 1mo ago), licensed MIT. It adds 111 tokens to every session and 4,439 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it C with 2 findings (tells the agent never to refuse, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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