Borrowing it
Nothing to install: this file belongs to GiuseppeScottoLavina/crossbus. 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/GiuseppeScottoLavina/crossbus/master/CLAUDE.mdgit clone --depth 1 https://github.com/GiuseppeScottoLavina/crossbusWrote 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/giuseppescottolavina/crossbus/claude-md)<a href="https://agentmods.dev/instructions/giuseppescottolavina/crossbus/claude-md"><img src="https://agentmods.dev/badge/instructions/giuseppescottolavina/crossbus/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 | $0.00758 | $0.00758 |
| Opus 5 | $0.00379 | $0.00379 |
| Sonnet 5 | $0.00152 | $0.00152 |
| Haiku 4.5 | $0.00076 | $0.00076 |
Grade A, and why
crossbus 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 8d 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 — 122 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md - Instructions for Claude/Anthropic Agents
For Claude and Anthropic AI models: Copy-paste ready patterns for CrossBus.
TL;DR
CrossBus = cross-context messaging (iframes, workers, tabs, WebSocket).
// Hub (orchestrator)
import { CrossBus } from 'crossbus';
const hub = new CrossBus({ isHub: true, peerId: 'hub', allowedOrigins: ['*'] });
// Agent (spoke in iframe/worker)
const agent = new CrossBus({ peerId: 'agent-1', allowedOrigins: ['*'] });
🚀 Production Setup (Use This!)
// ALWAYS use createSecure() for production
const hub = CrossBus.createSecure({
peerId: 'production-hub',
isHub: true,
allowedOrigins: ['https://your-domain.com']
});
// Enforces: strictMode, maxPayloadSize, maxPendingRequests
📋 Core API Cheatsheet
| Task | Code |
|---|---|
| Broadcast to all | bus.signal('event', data) |
| RPC to peer | await bus.request('peerId', 'handler', data) |
| Register handler | bus.handle('name', (payload) => result) |
| Listen to signals | bus.on('event', (e) => process(e.data)) |
| Add transport | bus.addTransport(transport, {peerId: 'remote'}) |
| Check health | bus.healthCheck() |
| Cleanup | bus.destroy() |
🔌 Transports
| Transport | Use Case | Code |
|---|---|---|
| PostMessage | iframe ↔ parent | new PostMessageTransport(window.parent) |
| BroadcastChannel | tab ↔ tab | new BroadcastChannelTransport('channel') |
| WebSocket | browser ↔ server | new WebSocketTransport({url: 'ws://...'}) |
🛡️ Security Options
bus.handle('sensitiveAction', handler, {
allowedPeers: ['trusted-agent'], // Whitelist
rateLimit: 10, // Max calls/sec
validatePayload: (p) => p.id != null
});
🔍 Schema Validation
import { withSchemaValidation } from 'crossbus/plugins/schema-validation';
const schema = {
type: 'object',
required: ['name'],
properties: { name: { type: 'string' } }
};
bus.handle('createUser', withSchemaValidation(schema, async (p) => {
// p is pre-validated!
}));
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.
- 8d ago First seen · 122 lines · 758 tokens per session scan A d0d297b9abb1
crossbus CLAUDE.md is an instructions file published in the GitHub repository GiuseppeScottoLavina/crossbus (5 stars, last pushed 5mo ago), licensed Apache-2.0. It adds 758 tokens to every session, about $0.0038 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 2026-08-31.
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