Borrowing it
Nothing to install: this file belongs to mullionlabs/mullion-ts. 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/mullionlabs/mullion-ts/main/CLAUDE.mdgit clone --depth 1 https://github.com/mullionlabs/mullion-tsWrote 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/mullionlabs/mullion-ts/claude-md)<a href="https://agentmods.dev/instructions/mullionlabs/mullion-ts/claude-md"><img src="https://agentmods.dev/badge/instructions/mullionlabs/mullion-ts/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 | $0.03329 | $0.03329 |
| Opus 5 | $0.01665 | $0.01665 |
| Sonnet 5 | $0.00666 | $0.00666 |
| Haiku 4.5 | $0.00333 | $0.00333 |
Grade A, and why
mullion-ts 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 — 424 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Mullion Development Guide
Project Overview
Mullion — TypeScript library for type-safe LLM context management.
Core philosophy: Compile-time safety, not runtime orchestration. We are ESLint + TypeScript for LLM workflows, not a new LangChain.
One-liner: "Catch context leaks and confidence issues before runtime"
Current version: 0.2.0 (all packages) Repository: https://github.com/mullionlabs/mullion-ts
Tech Stack
- Monorepo: pnpm workspaces + Turborepo
- Versioning: Changesets (independent releases)
- Build: tsup
- Testing: Vitest
- CI/CD: GitHub Actions
- Git hooks: Husky + lint-staged
- Linting: ESLint 9 (flat config) + TypeScript ESLint v8
- Formatting: Prettier
- Schemas: Zod v4.1.8+ (for AI SDK 5+ compatibility)
Project Structure
mullion/
├── packages/
│ ├── core/ # @mullion/core
│ │ ├── src/
│ │ │ ├── owned.ts # Owned<T, S> type
│ │ │ ├── semantic-value.ts # SemanticValue type
│ │ │ ├── context.ts # Context implementation
│ │ │ ├── scope.ts # scope() function
│ │ │ ├── bridge.ts # bridge utilities
│ │ │ ├── brand.ts # nominal typing utilities
│ │ │ ├── fork/ # fork/merge implementations
│ │ │ ├── merge/ # merge strategies
│ │ │ ├── trace/ # OpenTelemetry tracing
│ │ │ └── index.ts
│ │ ├── package.json
│ │ ├── tsconfig.json
│ │ └── tsup.config.ts
│ │
│ ├── eslint-plugin/ # @mullion/eslint-plugin
│ │ ├── src/
│ │ │ ├── rules/
│ │ │ │ ├── no-context-leak.ts
│ │ │ │ └── require-confidence-check.ts
│ │ │ └── index.ts
│ │ └── ...
│ │
│ └── ai-sdk/ # @mullion/ai-sdk
│ ├── src/
│ │ ├── client.ts # Mullion client implementation
│ │ ├── cache/ # provider-aware caching
│ │ ├── cost/ # cost estimation & tracking
│ │ └── index.ts
│ └── ...
│
├── examples/
│ └── basic/ # Working examples
│
├── docs/
│ ├── adr/ # Architecture Decision Records
│ ├── contributing/ # Contribution guides
│ ├── design/ # Design documents
│ ├── guides/ # User guides
│ ├── reference/ # API reference
│ └── README.md # Documentation index
│
├── .changeset/ # Changesets config
├── .github/workflows/ # CI/CD
├── turbo.json # Turborepo config
├── pnpm-workspace.yaml
├── tsconfig.base.json
└── package.json
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 · 424 lines · 3,329 tokens per session scan A 37256eb01cd6
mullion-ts CLAUDE.md is an instructions file published in the GitHub repository mullionlabs/mullion-ts (20 stars, last pushed 1mo ago), licensed MIT. It adds 3,329 tokens to every session, about $0.0166 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.
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