Renders Markdown to HTML while escaping raw HTML for safe output.
Click on "Deploy Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type @ followed by the MCP server name and your instructions, e.g., "@casper-tools What does the cron expression '*/15 * * * *' mean?"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
A Model Context Protocol (MCP) server exposing 12 small, fast, dependency-light utilities that AI agents reach for constantly: JSON inspection, regex testing, cron parsing, hashing, base64 encoding/decoding, URL analysis, color conversion, text diffing, CSV parsing, JWT decode/verification, Markdown-to-HTML rendering, and UUID/token minting.
Transport: Streamable HTTP. Auth: none (open public endpoint). No API keys. Free to use.
https://determines-product-administration-farmer.trycloudflare.comRelated MCP server: mcp-server-devutils
Connect any MCP client and call tools with standard JSON-RPC over Streamable HTTP. No auth, no keys, no setup.
Initialize the session:
{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"test","version":"1.0"}}}Call json_inspect on a sample payload:
{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"json_inspect","arguments":{"data":{"user":"alice","role":"admin"}}}}Response includes type, summary, keyCount, depth, and hasArrays.
Call hash_compute on a string:
{"jsonrpc":"2.0","id":3,"method":"tools/call","params":{"name":"hash_compute","arguments":{"input":"hello world","algorithm":"sha-256"}}}Response returns the hex-encoded digest plus algorithm + input length.
Full list of 12 tools, their input schemas, and live response examples are
available from the server itself via tools/list once connected.
Tool | What it does |
| Parse, validate and summarize JSON documents |
| Test regex patterns against sample strings |
| Parse/explain cron schedule expressions |
| Compute MD5/SHA-1/SHA-256/SHA-512 hashes |
| Base64 encode/decode text and bytes |
| Normalize, validate and decompose URLs |
| Convert between hex/rgb/hsl/named color formats |
| Line diff between two strings/texts |
| Parse CSV/TSV into rows, headers, JSON preview |
| Decode + verify HMAC-signed JWTs |
| Render Markdown to HTML (escaping raw HTML) |
| Generate v4 UUIDs / random URL-safe tokens |
Hosted mode — point any MCP client at the live endpoint above (streamable HTTP, no credentials):
{
"mcpServers": {
"casper-tools": {
"url": "https://determines-product-administration-farmer.trycloudflare.com"
}
}
}Local mode (Claude Code / Cursor / any MCP client):
{
"mcpServers": {
"casper-tools": {
"command": "npx",
"args": ["-y", "casper-tools"]
}
}
}npm install && npm start runs the server on port 3000 at /mcp (also
accepted at the bare host root). Tools are registered from tools.js and each
call is appended to logs/calls.jsonl for analytics.
Source lives in this repository. Published to the official MCP Registry as
io.github.magiautonomous/casper-tools. MIT licensed.
This server cannot be deployed
Exact hashing, base64/hex/URL encoding, JWT decoding and UUIDs for AI agents. No auth required.
Agent utility API: 28+ free endpoints (hash, QR, DNS, scrape, JWT...) run by an autonomous AI agent.
238+ dev tools via MCP: JSON, QR, PDF, DNS, hash, UUID, code review, JWT, SSL, WHOIS, and more
111 tools for AI assistants, so an answer comes from a rule instead of a guess. 84 deterministic utilities. IBAN and VAT validation, cron parsing, regex testing, hashing, JWT decoding, conversion between JSON, CSV, XML and YAML, units, number bases, timezones and date arithmetic. Eleven of them encode Dutch rules that a model tends to get wrong: AOW pension age, inheritance and gift tax, unemployment benefit duration, notice period, severance, the 30 percent ruling, holiday allowance, mileage allowance, and public and school holidays. Five more generate test data that is structurally valid and belongs to nobody: BSN, IBAN, BRP person records, UPA pension files and document numbers. 14 render tools that return a hosted file. HTML or a live URL to PDF, full page screenshots, QR codes, PDF merge and split, images to PDF, image resize, convert and compress, metadata stripping, PDF to DOCX and back. Plus read_page, which returns the readable content of a JavaScript rendered page as Markdown. 4 memory tools give an agent key-value state that survives between sessions, scoped to its own API key. 3 workflow tools list and run saved multi-step workflows on the caller's account. 6 AI tools for the jobs where a model is the right instrument rather than the wrong one: check a message for scam patterns, write a spreadsheet formula, turn a question into SQL, translate code between languages, improve a prompt, draft an email. Utilities and memory are free. Renders and AI tools have a free tier and credit packs. Workflows need an API key, because a workflow belongs to an account rather than to a key. Streamable HTTP at https://toolforte.com/api/mcp