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ComputeFirst

Official registry Data and databases

Free deterministic tools for math, data transforms, dates, text, statistics, finance, and units.

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).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http computefirst 'https://computefirst.net/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "computefirst": {
            "type": "http",
            "url": "https://computefirst.net/mcp"
        }
    }
}

Documentation

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

ComputeFirst agent skill

Instructions for Claude Code, Codex, Grok, and other autonomous agents to use ComputeFirst for deterministic computation: search → read the versioned contract → execute. Free, no API key or sign-up. Live-verified catalog: 516 tools (2026-10-25).

Install the Claude Code skill and MCP connection from this repository's marketplace:

/plugin marketplace add 321zz321/computefirst-skill
/plugin install computefirst@computefirst

Or add the MCP connection alone:

claude mcp add --transport http computefirst https://computefirst.net/mcp

Codex ~/.codex/config.toml:

[mcp_servers.computefirst]
url = "https://computefirst.net/mcp"

For Codex skill discovery, copy skills/computefirst/ into .agents/skills/computefirst/ or ~/.agents/skills/computefirst/, preserving references. Client setup and sources cover Claude Code, Cursor, VS Code, generic MCP clients, and plain HTTP.

Read the skill for selection rules, exact requests, limits, and six actual API results. AGENTS.md provides condensed guidance. The full MCP route exposes gateway tools; /mcp/chatgpt offers 40 named operations with smaller limits.

Verify with Node.js 22+ and network access:

node scripts/verify-examples.mjs

The script reads the documented requests/results directly and fails on drift. It also checks discovery and both MCP routes. No dependencies, credentials, or reporting calls. MIT license.

Frequently asked questions

What is ComputeFirst?

Free deterministic tools for math, data transforms, dates, text, statistics, finance, and units.

How do I install ComputeFirst?

It runs as a remote server. In Claude Code: claude mcp add --transport http computefirst 'https://computefirst.net/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does ComputeFirst 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 ComputeFirst open source?

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

Who maintains ComputeFirst?

It is published by 321zz321. 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.