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proofslip: Instructions file for Claude Code

CLAUDE.md

proofslip CLAUDE.md is an instructions file for Claude Code from Johnny-Z13/proofslip. It costs 1,608 tokens per session, scanned A, original, MIT.

A set of project instructions for working on ProofSlip, a product that creates checkable records showing what happened in an agent workflow, and its related products and packages.

In plain words
What is it for?
Use it when developing or documenting ProofSlip, ContextCapsule, their MCP server, or their Python tools and related projects.
Why use it?
It gives the coding agent the project context needed to make consistent changes across the product, repositories, published packages, and technology stack.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions CLAUDE.md.

This is Johnny-Z13/proofslip's own configuration. It tells Claude Code how to work on proofslip itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything proofslip configures →

not rated 1repo 3mo ago A scan 1,608 tokens original MIT
View source ↗ Johnny-Z13/proofslip proofslip.ai
Reuse

Borrowing it

Nothing to install: this file belongs to Johnny-Z13/proofslip. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/Johnny-Z13/proofslip/master/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/Johnny-Z13/proofslip

Made for: Claude Code.

Wrote 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.

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README.md
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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.

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Per session 1,608 This file is loaded in full into every session.
When invoked 1,608 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.01608 $0.01608
Opus 5.5 $0.00643 $0.00643
Sonnet 5.5 $0.00322 $0.00322
Haiku 4.5 $0.00161 $0.00161

Measured 1mo ago against content hash 7f0a43ab3bbf, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

proofslip 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.

CLAUDE.md · 138 lines

How it starts

The opening of the file, as written. The whole thing — 138 lines — stays where its author put it; the contents beside it link to each section on GitHub.

ProofSlip

Portable proof objects for agent workflows.

Live

  • Production: https://proofslip.ai
  • Domain: proofslip.ai
  • Sister product: ContextCapsule — same ecosystem, shared design language
  • ContextCapsule repo: ~/Projects/Products/context-capsule (keep READMEs and CLAUDE.md cross-referenced)

Product Position

ProofSlip and ContextCapsule are two primitives for reliable agent workflows:

  • ProofSlip (evidential) — "Here's what actually happened, and you can verify it."
  • ContextCapsule (navigational) — "Here's the situation, what matters, and what should happen next."

ProofSlip creates verifiable receipts that prove actions happened. Agents check receipts before deciding what to do next. Receipts are ephemeral (24h default), typed, and include polling guidance for non-terminal states.

Published Packages

  • MCP Server: @proofslip/mcp-server on npm — also registered on official MCP registry as ai.proofslip/mcp-server
  • LangChain Tools: langchain-proofslip on PyPI — 3 tools + toolkit for Python agent frameworks
  • Listings: Smithery (mcp.so), Glama.ai, official MCP registry, PulseMCP (auto-ingests)

Tech Stack

  • Runtime: Node.js 18+
  • Framework: Hono v4
  • ORM: Drizzle ORM with Neon PostgreSQL
  • Language: TypeScript (strict mode)
  • Deployment: Vercel serverless
  • Testing: Vitest
  • MCP: @modelcontextprotocol/sdk for MCP server package
  • Python packages: Built with setuptools, published via twine

Development

npm run dev          # Local dev server
npm test             # Run tests (watch mode)
npm run test:all     # Full stack test — 4 layers, ~184 tests, summary report
npm run test:unit    # Unit + integration only
npm run test:smoke   # Smoke tests against production (needs PROOFSLIP_API_KEY in .env)
npm run test:packages # MCP server package tests
npm run db:generate  # Generate migrations
npm run db:migrate   # Apply migrations
npm run db:seed      # Seed API key (npm run db:seed -- [email protected])

Read the full file on GitHub · 138 lines

Changes

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.

  1. 1mo ago First seen · 138 lines · 1,608 tokens per session scan A 7f0a43ab3bbf

Subscribe to this mod's changes

proofslip CLAUDE.md is an instructions file published in the GitHub repository Johnny-Z13/proofslip (1 stars, last pushed 3mo ago), licensed MIT. It adds 1,608 tokens to every session, about $0.0064 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.

agentic-workflowagentsaiai-agentsmcpreciept
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