Borrowing it
Nothing to install: this file belongs to anvilnine/artifacts. 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/anvilnine/artifacts/main/CLAUDE.mdgit clone --depth 1 https://github.com/anvilnine/artifactsWrote 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/anvilnine/artifacts/claude-md)<a href="https://agentmods.dev/instructions/anvilnine/artifacts/claude-md"><img src="https://agentmods.dev/badge/instructions/anvilnine/artifacts/claude-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/anvilnine/artifacts/claude-md"><img src="https://agentmods.dev/badge/instructions/anvilnine/artifacts/claude-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 | $0.00497 | $0.00497 |
| Opus 5.5 | $0.00199 | $0.00199 |
| Sonnet 5.5 | $0.00099 | $0.00099 |
| Haiku 4.5 | $0.00050 | $0.00050 |
Grade A, and why
artifacts CLAUDE.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.
What it actually says
artifacts
Self-hosted, Claude-style artifact publishing. POST HTML / a React component / Markdown / a zipped
static site, get back an unguessable URL on your own domain. One container, single admin account, no
database by default (plain files under /data); optional S3 / git / Postgres / SQLite backends. No
build step, Node >= 22. The end-to-end suite is bash .github/workflows/smoke.sh <url> <key>; unit
tests run with npm test.
Read the README and docs/ before working on a feature.
Domains
This product is being renamed to Dropkiln (docs/superpowers/plans/backlogs/backlog-6-rebrand.md).
Both domains are bought and both now resolve through Cloudflare nameservers on the Anvil Nine
Cloudflare account, as of 2026-08-06:
dropkiln.com= company and product: marketing, docs, blog, dashboard atapp.dropkiln.com, email. Cookies live here.dropkiln.app= user content only: tenant sites and artifacts at<name>.dropkiln.app. Wildcard, Cloudflare for SaaS custom hostnames, and the routing Worker all attach to this zone. Never set a dashboard cookie here.
Backlog 6 T6.1.1 said anvilnine.com would stay off Cloudflare. That is no longer true; all five
Anvil Nine zones are on the one account now. Nothing about the .com / .app split changes.
Current state worth knowing before you plan anything DNS-shaped: both apexes have proxied A records
pointing at an origin that is down, so https://dropkiln.com returns 522. Neither zone has a
DMARC record, so the T6.1.2 parking task (null MX + SPF + DMARC on both) is still open. Org-level
table: ../docs/domains.md.
Writing docs (README, docs/, PR bodies, comments)
Follow the org-wide prose rules in the parent anvilnine/CLAUDE.md.
Repo-specific check: before committing a README change, run grep -n "—\|–" README.md and confirm
it returns nothing.
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 First seen · 37 lines · 497 tokens per session scan A 951c5cf02260
artifacts CLAUDE.md is an instructions file published in the GitHub repository anvilnine/artifacts (8 stars, last pushed yesterday), licensed MIT. It adds 497 tokens to every session, about $0.0020 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 2026-08-31.
artifacts CLAUDE.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| artifacts CLAUDE.mdanvilnine/artifacts | Instructions file | 8 | yesterday | MIT | A | 497 | Claude Code |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | yesterday | 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 |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |