ProofSlip

Name: ProofSlip
Author: Johnny-Z13

by Johnny-Z13version 0.2.3i★ –iRuns on your computer

Registry nameai.proofslip/mcp-server

Install

Overview

Description from the maker (original English)

Receipt-based verification for AI agent workflows — create, verify, and poll ephemeral proof objects

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Other
You need to fill in: PROOFSLIP_API_KEY

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: PROOFSLIP_API_KEY, PROOFSLIP_BASE_URL

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "proofslip": {
      "command": "npx",
      "args": [
        "-y",
        "@proofslip/mcp-server"
      ],
      "env": {
        "PROOFSLIP_API_KEY": "your-value",
        "PROOFSLIP_BASE_URL": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add proofslip --env PROOFSLIP_API_KEY=your-value --env PROOFSLIP_BASE_URL=your-value -- npx -y @proofslip/mcp-server

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "proofslip": {
      "command": "npx",
      "args": [
        "-y",
        "@proofslip/mcp-server"
      ],
      "env": {
        "PROOFSLIP_API_KEY": "your-value",
        "PROOFSLIP_BASE_URL": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "proofslip": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@proofslip/mcp-server"
      ],
      "env": {
        "PROOFSLIP_API_KEY": "your-value",
        "PROOFSLIP_BASE_URL": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

PROOFSLIP_API_KEY secret required env
Your ProofSlip API key (get one free at proofslip.ai)
PROOFSLIP_BASE_URL env
API base URL (defaults to https://proofslip.ai)

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 6, 2026

✓ Pass
Maker matches the repo
The registry name was verified against the domain proofslip.ai (the registry checks domain ownership)
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Otheri

More stars than 0% of the other 32509 servers in this category
Published to the registry more recently than 6% of the other 32509 servers in this category
Basic checks equal to or better than 100% of the other 32509 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is ProofSlip safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: PROOFSLIP_API_KEY

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.2.3) reached the registry 7 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, Fomu MCP

Alternatives

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

@proofslip/mcp-server

MCP server for ProofSlip — receipt-based verification for AI agent workflows. Create, verify, and poll ephemeral receipts that let agents prove what happened before deciding what happens next.

Tools

`create_receipt`

Create a receipt to record that something happened. Receipts expire after 24 hours by default.

Parameter	Type	Required	Description
`type`	enum	Yes	`action`, `approval`, `handshake`, `resume`, `failure`
`status`	string	Yes	Freeform status (e.g. "success", "pending", "failed")
`summary`	string	Yes	What happened — max 280 chars
`payload`	object	No	Structured JSON data (max 4KB)
`ref`	object	No	Workflow references (run_id, agent_id, workflow_id, etc.)
`expires_in`	number	No	TTL in seconds (60–86400, default 24h)
`idempotency_key`	string	No	Prevents duplicate receipts on retry
`audience`	"human"	No	Enrich verify page with social cards

Requires: PROOFSLIP_API_KEY environment variable.

`verify_receipt`

Verify a receipt and retrieve its full data before deciding what to do next.

Parameter	Type	Required	Description
`receipt_id`	string	Yes	The receipt ID (starts with `rct_`)

No API key required.

`check_receipt_status`

Lightweight status poll — returns only status and polling guidance, no payload.

Parameter	Type	Required	Description
`receipt_id`	string	Yes	The receipt ID (starts with `rct_`)

No API key required. Use this instead of verify_receipt when you only need to know if state has changed.

`signup`

Get a free API key (500 receipts/month).

Parameter	Type	Required	Description
`email`	string	Yes	Your email address

No API key required.

Usage Example

You: "Create a receipt proving we sent the welcome email"

Agent calls create_receipt: type: "action" status: "success" summary: "Sent welcome email to user@example.com" ref: { workflow_id: "onboarding-123", agent_id: "email-agent" }

→ Returns receipt_id, verify_url, is_terminal: true

You: "Verify receipt rct_abc123 before sending the follow-up"

Agent calls verify_receipt: receipt_id: "rct_abc123"

→ Returns full receipt: type, status, summary, payload, ref → Agent confirms the action happened before proceeding

You: "Check if the approval is still pending"

Agent calls check_receipt_status: receipt_id: "rct_def456"

→ Returns: status: "pending", is_terminal: false, next_poll_after_seconds: 30 → Agent waits 30s then checks again

Setup

Claude Desktop

Add to claude_desktop_config.json:

"mcpServers": { "proofslip": { "command": "npx", "args": ["-y", "@proofslip/mcp-server"], "env": { "PROOFSLIP_API_KEY": "ak_your_key_here" } } } }

Cursor / Windsurf

Add to MCP settings:

"mcpServers": { "proofslip": { "command": "npx", "args": ["-y", "@proofslip/mcp-server"], "env": { "PROOFSLIP_API_KEY": "ak_your_key_here" } } } }

Claude Code

claude mcp add proofslip -- npx -y @proofslip/mcp-server

Then set your API key in your environment or .env file.

Configuration

Variable	Required	Description
`PROOFSLIP_API_KEY`	For creating receipts	Your API key (starts with `ak_`)
`PROOFSLIP_BASE_URL`	No	API base URL (default: `https://proofslip.ai`)

Get an API Key

Use the signup tool from any MCP client, or:

curl -X POST https://proofslip.ai/v1/auth/signup \

-H "Content-Type: application/json" \ -d '{"email": "you@example.com", "source": "api"}'

License

MIT

ProofSlip

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

Fomu MCP

README from the maker

@proofslip/mcp-server

Tools

create_receipt

verify_receipt

check_receipt_status

signup

Usage Example

Setup

Claude Desktop

Cursor / Windsurf

Claude Code

Configuration

Get an API Key

Links

License

`create_receipt`

`verify_receipt`

`check_receipt_status`

`signup`