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.
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 cloudflare/computer --skill hellogit 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/skills/cloudflare/computer/hello)<a href="https://agentmods.dev/skills/cloudflare/computer/hello"><img src="https://agentmods.dev/badge/skills/cloudflare/computer/hello/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/cloudflare/computer/hello"><img src="https://agentmods.dev/badge/skills/cloudflare/computer/hello.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 | $0.00035 | $0.00173 |
| Opus 5.5 | $0.00014 | $0.00069 |
| Sonnet 5.5 | $0.00007 | $0.00035 |
| Haiku 4.5 | $0.00003 | $0.00017 |
Grade A, and why
hello 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.
What it actually says
Hello
This file lives in src/skills/hello/SKILL.md in the example's source.
The Worker imports the whole src/skills directory with
import skills from "computer:bundle/src/skills", and
WorkerBundle(skills) copies it to /workspace/.agents/skills as a
read-only mount.
Try:
ls -R /workspace/.agents/skills
sh /workspace/.agents/skills/hello/scripts/hello.sh
Under vite dev, edit this file and send the next request: the
workspace picks up the new copy without a restart.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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 First seen · 23 lines · 35 tokens per session scan A d506ca9184bd
hello is a skill published in the GitHub repository cloudflare/computer (9,607 stars, last pushed today), licensed MIT. It adds 35 tokens to every session and 173 once invoked, about $0.0001 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 2026-10-13.
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