ProofSlip runs on your own machine — the client starts it, so there is no endpoint to ping. 71 installs a week from npm. Last commit 19 Jul 2026.
Receipt-based verification for AI agent workflows — create, verify, and poll ephemeral proof objects
What the code does
We read the source, 4 d ago · rules 995398eba69f
What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.
const FONT_BASE64 = 'd09GMk9UVE8AAFfgAAwAAAABSgAAAFeQAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAADYPaEBqFYhuUbhyWFAZgAOpuATYCJAOSSAQGBYgeByBbJ0mRC/1P7u5tS4r6RRqA3GIAlX/Olb1lcIFt04l41nlDup6FdNjsYAwbJ4Dh+a2z/////////5XLl8fmkrT15fwtLcgQZODm2O0OLwIBpKaCgyKrtRHTlKsxpmxVWWhFEXOQU1M38lQa2QK2FB8hFIH…
Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.
This code can reach further than it looks
We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.
Connect this server
This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.
claude mcp add mcp-server -e 'PROOFSLIP_API_KEY=<PROOFSLIP_API_KEY>' -- npx -y @proofslip/mcp-server{
"mcpServers": {
"mcp-server": {
"command": "npx",
"args": [
"-y",
"@proofslip/mcp-server"
],
"env": {
"PROOFSLIP_API_KEY": "<PROOFSLIP_API_KEY>"
}
}
}
}[mcp_servers.mcp-server]
command = "npx"
args = ["-y", "@proofslip/mcp-server"]
env = { PROOFSLIP_API_KEY = "<PROOFSLIP_API_KEY>" }{
"mcpServers": {
"mcp-server": {
"command": "npx",
"args": [
"-y",
"@proofslip/mcp-server"
],
"env": {
"PROOFSLIP_API_KEY": "<PROOFSLIP_API_KEY>"
}
}
}
}{
"servers": {
"mcp-server": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@proofslip/mcp-server"
],
"env": {
"PROOFSLIP_API_KEY": "<PROOFSLIP_API_KEY>"
}
}
}
}Put your own value in place of
<PROOFSLIP_API_KEY> (Your ProofSlip API key (get one free at proofslip.ai)).
The author’s registry entry marks it as required.
Optional settings from the registry entry, left out of the block above:
PROOFSLIP_BASE_URL (API base URL (defaults to https://proofslip.ai)).
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ProofSlip — questions
Answers built from our own checks of this server.