Borrowing it
Nothing to install: this file belongs to lukaisailovic/openislands. 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/lukaisailovic/openislands/main/CLAUDE.mdgit clone --depth 1 https://github.com/lukaisailovic/openislandsWrote 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/lukaisailovic/openislands/claude-md)<a href="https://agentmods.dev/instructions/lukaisailovic/openislands/claude-md"><img src="https://agentmods.dev/badge/instructions/lukaisailovic/openislands/claude-md.svg" alt="Measured on agentmods" 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 | $0.01466 | $0.01466 |
| Opus 5 | $0.00733 | $0.00733 |
| Sonnet 5 | $0.00293 | $0.00293 |
| Haiku 4.5 | $0.00147 | $0.00147 |
Grade A, and why
openislands 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 6d 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 — 90 lines — stays where its author put it; the contents beside it link to each section on GitHub.
OpenIslands — agent guide
Operating guide for working in this repo. Deep reference is linked, not inlined — read those docs on demand instead of holding them in context.
What it is
A local-first compiler + runtime for agent-maintained data apps. An app is a typed
manifest of reusable visual islands bound to typed data contracts built from local
files. You edit the manifest, never rendering code; validate fails loudly and names the island
when a binding and the data disagree. v1 is live-only — serve boots the TanStack Start SSR
runtime, queries files through the DuckDB core per request, and pushes SSE updates as files
change. No static export, no generated/ snapshots.
Repo map
packages/schema # the contract — Zod → types + JSON Schema. The keystone; everything depends on it.
packages/storage # swappable storage ports (ContentStore / AppStateStore / VersionStore) + local-disk adapters; configureStorage() swaps the backend
packages/compiler # DuckDB query core: files → typed contracts; runs transforms/queries live
packages/runtime # TanStack Start SSR app: island registry + React renderers
packages/cli # the `openislands` command (init / validate / serve / add / infer)
packages/mcp-server # the MCP edit loop (@openislands/mcp) in Code Mode: ONE `execute` tool drives the whole `oi` API (read-many + oi.app().patchManifest/replaceManifest → applyEdit; oi.createApp/deleteApp) in a node:vm sandbox — no per-operation tools
templates/ # empty (default), finance, health, operations — each ships .mcp.json + AGENTS.md + the skill; scaffolded by `init`
skills/openislands/ # the installable agent skill (npx skills add lukaisailovic/openislands --skill openislands); synced into every template
apps/examples/ # dogfood workspace (multi-app serve)
apps/docs/ # the docs site (Fumadocs on TanStack Start, static → Cloudflare Workers); apps/docs/public/start.md is the raw agent-onboarding doc served at /start.md
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.
- 6d ago First seen · 90 lines · 1,466 tokens per session scan A c3c82d2f77d1
openislands CLAUDE.md is an instructions file published in the GitHub repository lukaisailovic/openislands (21 stars, last pushed 1mo ago), licensed MIT. It adds 1,466 tokens to every session, about $0.0073 per session on Opus 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
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.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
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).
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
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.
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.