Touchstone

Name: Touchstone
Author: savecharlie

by savecharlieversion 0.1.0i★ –iRuns on your computer

Registry nameio.github.savecharlie/touchstone

Install

Overview

Description from the maker (original English)

Verifiable text/code/measurement tools for agents, each reproducing a named authority.

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

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).
The registry lists no key to fill in.

You need

PyPIPython’s uv installed (for the uvx 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": {
    "touchstone": {
      "command": "uvx",
      "args": [
        "touchstone-compute"
      ]
    }
  }
}

Run this in your terminal

claude mcp add touchstone -- uvx touchstone-compute

Open in Cursor

Or copy the settings yourself

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

{
  "mcpServers": {
    "touchstone": {
      "command": "uvx",
      "args": [
        "touchstone-compute"
      ]
    }
  }
}

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": {
    "touchstone": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "touchstone-compute"
      ]
    }
  }
}

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.

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 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account savecharlie, which owns the repo
… 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 32589 servers in this category
Published to the registry more recently than 15% of the other 32589 servers in this category
Basic checks equal to or better than 100% of the other 32589 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 Touchstone 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?

The registry does not list a required key, though some servers ask you to sign in on first use.

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 (0.1.0) reached the registry 4 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Python (uv) on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, Detailing Manager

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Spec Driven Development

by formulahendry

MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.

Runs on your computer★ 440MITUpdated 14 months ago

Install

Remote Desktop Commander

by desktop-commander

Remote Desktop Commander: use files, terminal and processes on your own computers from any AI app.

Runs in the cloud★ 211Updated yesterday

Install

Detailing Manager

by RadoslavMoshev

Connect your auto detailing studio's tasks, cars, clients and revenue to Claude or ChatGPT.

Runs on your computerUpdated today

Install

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.

Touchstone — verifiable compute for agents

mcp-name: io.github.savecharlie/touchstone

Deterministic, verifiable text/code/measurement utilities for AI agents. Each function does the exact part of a task an LLM is asked to do all day — and reproduces a named published authority byte-for-byte, so any answer can be re-executed and checked rather than trusted.

Trust by re-execution, not reputation. The proof is the property.

This is the open core. The hosted suite at [touchstone.locomot.io](https://touchstone.locomot.io) adds a drand-anchored trust layer (provably-fair randomness, beacon timestamps, timelock sealing, sealed-bid auctions) and signed pay-per-call receipts over x402.

Install

pip install touchstone-compute            # the library

pip install "touchstone-compute[mcp]" # + the MCP server for AI agents

The tools

Function	Does	Authority
`units.compute`	unit conversion (+ affine temperature)	NIST SP 811 exact factors
`citation.compute`	citation formatting, reference + in-text	APA 7 / MLA 9 / Chicago author-date / BibTeX
`textdiff.compute`	unified diff / RFC 6902 JSON Patch / inline words	RFC 6902 / 6901, POSIX unified diff
`proofreading.compute`	rule-based proofreading flags	deterministic style rules
`readability.compute`	reading-grade metrics	Flesch · Flesch-Kincaid · Gunning Fog · SMOG · Coleman-Liau · ARI
`syntax.compute`	does it parse? + error location	each language's reference parser

from touchstone import units, citation, textdiff

units.compute(1, "nautical_mile", "meter") # {'result': 1852.0, 'exact': True, ...}

citation.compute("apa", "book", authors="Anderson, Benedict", title="Imagined communities", year=1983, publisher="Verso")

"Anderson, B. (1983). Imagined communities. Verso."

textdiff.compute(a='{"v":1}', b='{"v":2}', mode="json")

{'patch': [{'op': 'replace', 'path': '/v', 'value': 2}], 'op_count': 1, ...}

As an MCP server

pip install "touchstone-compute[mcp]"

touchstone-mcp # stdio transport, ready for any MCP client

Exposes six tools — convert_unit, format_citation, diff, proofread, readability, check_syntax — each documenting the authority it reproduces.

Why verifiable, not just correct

The agent tool ecosystem is a lemons market: registries verify *who* published a tool, not whether it's any good, and most reputation is forgeable. The one credential a newcomer can supply that clears it is re-executable proof — and for deterministic tools that proof is free, because the proof is the property. Don't trust these answers; re-run them. (the argument in full)

Touchstone

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

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

Detailing Manager

README from the maker

Touchstone — verifiable compute for agents

Install

The tools

"Anderson, B. (1983). *Imagined communities*. Verso."

{'patch': [{'op': 'replace', 'path': '/v', 'value': 2}], 'op_count': 1, ...}

As an MCP server

Why verifiable, not just correct

License

"Anderson, B. (1983). Imagined communities. Verso."