Borrowing it
Nothing to install: this file belongs to sint-ai/sint-protocol. 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/sint-ai/sint-protocol/main/CLAUDE.mdgit clone --depth 1 https://github.com/sint-ai/sint-protocolWrote 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/sint-ai/sint-protocol/claude-md)<a href="https://agentmods.dev/instructions/sint-ai/sint-protocol/claude-md"><img src="https://agentmods.dev/badge/instructions/sint-ai/sint-protocol/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/sint-ai/sint-protocol/claude-md"><img src="https://agentmods.dev/badge/instructions/sint-ai/sint-protocol/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 | $0.02643 | $0.02643 |
| Opus 5.5 | $0.01057 | $0.01057 |
| Sonnet 5.5 | $0.00529 | $0.00529 |
| Haiku 4.5 | $0.00264 | $0.00264 |
Grade A, and why
sint-protocol 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 1mo 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 — 222 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SINT Protocol — Agent Guide
This file helps AI agents (and humans) understand and contribute to the SINT Protocol codebase.
What is this?
SINT is a security enforcement layer for physical AI. It sits between AI agents and the physical world (robots, tool calls, actuators) ensuring every action is authorized, constrained, and audited.
Quick Commands
pnpm install # Install dependencies
pnpm run build # Build all packages (required before test)
pnpm run test # Run all tests (currently 1,728 passing)
pnpm run typecheck # Type-check without emitting
pnpm run clean # Remove build artifacts
pnpm run bench # Run PolicyGateway performance benchmarks (p50/p99 latency)
Run a single package:
pnpm --filter @sint/gate-policy-gateway test
pnpm --filter @sint/bridge-mcp test
Start the gateway server:
pnpm --filter @sint/gateway-server dev
Monorepo Layout
apps/gateway-server/ → Hono HTTP API (port 3000)
packages/core/ → Shared types, Zod schemas, tier constants
packages/capability-tokens/ → Ed25519 token issuance, delegation, validation
packages/policy-gateway/ → THE choke point: tier assignment, constraints, combos
packages/evidence-ledger/ → SHA-256 hash-chained audit log
packages/bridge-mcp/ → MCP tool call → SINT request mapping
packages/bridge-ros2/ → ROS 2 topic/service → SINT request mapping
packages/persistence/ → Storage interfaces + in-memory implementations
packages/conformance-tests/ → Security regression suite (must pass on every PR)
Architecture Rules
1. Every action flows through PolicyGateway.intercept()
No bridge adapter, route handler, or service should make authorization decisions independently. All requests go through the gateway.
2. Result<T, E> — never throw
All fallible operations return { ok: true, value: T } | { ok: false, error: E }. Use the ok() and err() helpers from @sint/core. Never use try/catch for control flow.
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.
- 1mo ago First seen · 222 lines · 2,643 tokens per session scan A 45fce1b1531a
sint-protocol CLAUDE.md is an instructions file published in the GitHub repository sint-ai/sint-protocol (15 stars, last pushed today), licensed Apache-2.0. It adds 2,643 tokens to every session, about $0.0106 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.
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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).
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AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
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Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
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Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.