Cloudflare Computer is a virtual filesystem whose state is stored in SQLite inside a Durable Object and exposed through selectable execution backends. It lets coding agents work with files, shell commands, JavaScript modules, containers, and networked Linux environments.
Borrowing it
Nothing to install: this file belongs to cloudflare/computer. 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/cloudflare/computer/main/AGENTS.mdgit clone --depth 1 https://github.com/cloudflare/computerWrote 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/cloudflare/computer/agents-md)<a href="https://agentmods.dev/instructions/cloudflare/computer/agents-md"><img src="https://agentmods.dev/badge/instructions/cloudflare/computer/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/cloudflare/computer/agents-md"><img src="https://agentmods.dev/badge/instructions/cloudflare/computer/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 | $0.02348 | $0.02348 |
| Opus 5.5 | $0.00939 | $0.00939 |
| Sonnet 5.5 | $0.00470 | $0.00470 |
| Haiku 4.5 | $0.00235 | $0.00235 |
Grade A, and why
computer 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 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.
How it starts
The opening of the file, as written. The whole thing — 189 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Agent guidelines
Read these first
README.md— what this repo is and how the pieces fit together.CONTRIBUTING.md— public contribution paths.COLLABORATORS.md— setup, checks, commit and pull request conventions. The canonical source for the day-to-day workflow.docs/README.md— design specification. Forward- looking; treat as intent, not as a description ofmain.docs/08_capnweb_interface.md— the RPC contract between the Durable Object andcomputerd. Required reading before touchingpackages/rpcorpackages/computer.- Each package's own
README.md— implementation status and package-specific notes.
Skills
In-repo skills live under .agents/skills/. Load
the file directly when the trigger applies:
| Skill | Load when |
|---|---|
prose |
Writing code comments, commit messages, READMEs, or documentation. |
pull-requests |
Writing or editing a pull request description. |
test-driven-development |
Implementing logic, fixing a bug, or changing behavior. |
capnweb |
Touching anything that crosses the RPC boundary: packages/rpc, packages/computer, the computerd client, or the Durable Object server. |
cloudflare |
Index of host-side Cloudflare skills — Workers, Durable Objects, wrangler, sandbox SDK, agents SDK. |
Environment setup
A fresh container does not have everything the tests need. The traps below cost real time if you discover them one failure at a time.
Native build tools. packages/computerd depends on a vendored copy
of fuse-napi at packages/computerd/vendor/fuse-napi, a native addon
compiled from source on install. Building it needs a C toolchain and the
libfuse 3 headers. On Debian or Ubuntu:
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.
- 3d ago Changed · +4 lines · +97 tokens per session 1b4bced75477
- 17d ago Changed · +7 tokens per session e85b2bc1505b
- 28d ago Changed · +4 tokens per session fe44881936f5
- 2mo ago First seen · 185 lines · 2,240 tokens per session scan A 6a5aab8dc858
computer AGENTS.md is an instructions file published in the GitHub repository cloudflare/computer (9,753 stars, last pushed today), licensed MIT. It adds 2,348 tokens to every session, about $0.0094 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.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.