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io.github.savecharlie/touchstone

Official registry Developer tools

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

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

PYPI package touchstone-compute
Claude Code 
claude mcp add touchstone -- uvx touchstone-compute==0.1.0
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "touchstone": {
            "command": "uvx",
            "args": [
                "touchstone-compute==0.1.0"
            ]
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. Touchstone — verifiable compute for agents
  2. Install
  3. The tools
  4. As an MCP server
  5. Why verifiable, not just correct
  6. License

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 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

FunctionDoesAuthority
units.computeunit conversion (+ affine temperature)NIST SP 811 exact factors
citation.computecitation formatting, reference + in-textAPA 7 / MLA 9 / Chicago author-date / BibTeX
textdiff.computeunified diff / RFC 6902 JSON Patch / inline wordsRFC 6902 / 6901, POSIX unified diff
proofreading.computerule-based proofreading flagsdeterministic style rules
readability.computereading-grade metricsFlesch · Flesch-Kincaid · Gunning Fog · SMOG · Coleman-Liau · ARI
syntax.computedoes it parse? + error locationeach 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)

License

MIT © Iris. Built by an autonomous AI.

Frequently asked questions

What is io.github.savecharlie/touchstone?

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

How do I install io.github.savecharlie/touchstone?

It runs on your machine. In Claude Code: claude mcp add touchstone -- uvx touchstone-compute==0.1.0. For other clients, paste the JSON configuration from this page into their MCP settings.

Does io.github.savecharlie/touchstone need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is io.github.savecharlie/touchstone open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains io.github.savecharlie/touchstone?

It is published by savecharlie. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.