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.
Borrowing it
Nothing to install: this file belongs to GCWing/BitFun. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/GCWing/BitFun/main/AGENTS.mdgit 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/instructions/gcwing/bitfun/agents-md)<a href="https://agentmods.dev/instructions/gcwing/bitfun/agents-md"><img src="https://agentmods.dev/badge/instructions/gcwing/bitfun/agents-md/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/instructions/gcwing/bitfun/agents-md"><img src="https://agentmods.dev/badge/instructions/gcwing/bitfun/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.05308 | $0.05308 |
| Opus 5.5 | $0.02123 | $0.02123 |
| Sonnet 5.5 | $0.01062 | $0.01062 |
| Haiku 4.5 | $0.00531 | $0.00531 |
Grade A, and why
BitFun AGENTS.md 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 2mo 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 — 377 lines — stays where its author put it; the contents beside it link to each section on GitHub.
中文 | English
AGENTS.md
OpenBitFun is a Rust workspace plus React frontends.
Repository rule: keep product logic platform-agnostic, then expose it through platform adapters.
Quick start
- Read
README.mdandCONTRIBUTING.mdbefore architecture-sensitive changes. - Use the primary product loop below for normal development. Surface-specific alternatives belong in the nearest app guide.
- After Rust file changes, prefer
pnpm run fmt:rsto format only changed or staged.rsfiles. Usecargo fmtonly when you intentionally want broader formatting coverage. - After changes, use the nearest local
AGENTS.mdfor the focused verification command. The repository-level verification section below only covers cross-cutting checks. - Workspace Rust dependencies own compatible versions, not broad capability
unions. Each crate must select the dependency features it actually uses;
keep test-only features in dev-dependencies and attach feature-gated service
capabilities to the owning crate feature. Disable third-party defaults in
[workspace.dependencies]when they are not part of every consumer's contract; members inherit that policy and add only their needed slices. For internal crates whose guardeddefaultis empty, do not repeatdefault-features = falseon every edge. Narrow consumers of an intentional compatibility default, such as ACP, must still disable it explicitly. Manifests copied into a standalone Docker build context must keep explicit versions and default policy because they cannot inherit the workspace root.tokio/fullis forbidden in the root workspace and workspace members.
Layered Module Index
Dependencies flow top to bottom. This table is the physical crate layout, not
the full conceptual architecture. For Product Surface / Product Assembly /
Product Feature / Agent Kernel / Execution / Extension / Cross-platform Adapter /
Stable Contracts and Security Control Plane boundaries, read
docs/architecture/product-architecture.md.
Keep crate dependencies inside each layer to the smallest set needed.
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.
- 2mo ago Changed · +6 lines · +139 tokens per session d9179a41f7d3
- 2mo ago First seen · 371 lines · 5,169 tokens per session scan A 7e9b785a5d5d
BitFun AGENTS.md is an instructions file published in the GitHub repository GCWing/BitFun (2,077 stars, last pushed 2mo ago), licensed MIT. It adds 5,308 tokens to every session, about $0.0212 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.
BitFun AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| BitFun AGENTS.mdGCWing/BitFun | Instructions file | 2.1k | 2mo ago | MIT | A | 5,308 | Codex, OpenCode |
| vibe-coding-prompt-template backend.instructions.mdKhazP/vibe-coding-prompt-template | Instructions file | 3.2k | 1mo ago | MIT | A | 139 | GitHub Copilot |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | today | MIT | A | 7,461 | Codex, OpenCode |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | yesterday | MIT | A | 4,680 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 5,516 | GitHub Copilot |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 3,093 | GitHub Copilot |