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A free, remote Model Context Protocol server with exact, deterministic text and data tools for AI assistants: JSON formatting and conversion, OpenAI token counts, cron schedules, date and age maths with exam cut-offs, word counts, CGPA conversion with official university formulas, time zones with daylight saving, print sizes and a lookup for the Cuelark UI shadcn registry.
URL: https://tools.cuelark.com/mcp
Transport: Streamable HTTP (JSON responses, stateless)
Auth: none · Price: free · Rate limit: 600 requests per minute per IP
The same tools run as web pages, in the browser, at tools.cuelark.com.
Settings → Connectors → Add custom connector → paste https://tools.cuelark.com/mcp.
claude mcp add --transport http cuelark-tools https://tools.cuelark.com/mcp~/.cursor/mcp.json (global) or .cursor/mcp.json (project):
{
"mcpServers": {
"cuelark-tools": { "url": "https://tools.cuelark.com/mcp" }
}
}.vscode/mcp.json:
{
"servers": {
"cuelark-tools": { "type": "http", "url": "https://tools.cuelark.com/mcp" }
}
}npx -y mcp-remote https://tools.cuelark.com/mcpRelated MCP server: Touchstone MCP Server
Tool | What it does |
| Validate JSON and return it pretty-printed or minified, optionally with keys sorted. Errors give line and column. |
| Convert between JSON and YAML (JSON → YAML) or CSV (both directions; CSV needs a header row, JSON needs an array of objects). |
| Exact OpenAI token counts (o200k_base for GPT-4o/4.1/5 and o-series, cl100k_base for GPT-4/3.5) plus labelled estimates for Claude and Gemini. |
| Describe a cron expression in plain English and list its next run times in an IANA time zone. Accepts 5-field cron, @daily-style macros and pasted crontab lines. |
| Days between two dates (with years/months/days and working days), or add/subtract days, weeks, months, years or working days. Month ends clamp (31 Jan + 1 month = 28/29 Feb). |
| Exact age in years, months and days on a date, and eligibility against an age limit ("attained min, not attained max"). Built-in exam presets from official notices: upsc-cse-2026 (UPSC Civil Services 2026), ssc-chsl-2025 (SSC CHSL 2025). |
| Count words (Unicode word rules, works for Japanese/Chinese/Hindi), characters as graphemes, sentences, paragraphs, reading time, X/Twitter weighted length, SMS segments, and platform limits. |
| Convert CGPA to percentage or back using only formulas the board or university publishes: cbse (Percentage = 9.5 × CGPA); vtu (Percentage = (CGPA − 0.75) × 10); anna (Percentage = CGPA × 10). Each result cites the source. |
| Convert a wall-clock date and time from one IANA time zone to another with daylight saving for that date, and report each zone's next clock change. |
| Convert between pixels and physical size at a DPI: pixels → print size (mm/cm/in), or physical size → pixels needed. |
| Search the ui.cuelark.com shadcn/ui registry (React components, blocks and themes) and get the shadcn CLI install command for each match. |
All tools are read-only and return both text and structuredContent.
"Am I eligible for UPSC CSE 2026 if I was born on 3 March 1995?"
"What is 4 pm IST on 12 March 2027 in New York?"
"Explain */15 9-17 * * MON-FRI in Asia/Kolkata and show the next 5 runs."
"Convert a VTU CGPA of 7.8 to a percentage."
"Turn this JSON array into CSV."
"Find a Cuelark UI component for a pricing table and give me the install command."
CGPA: CBSE (9.5 × CGPA, CCE certificate), VTU ((CGPA − 0.75) × 10, vtu.ac.in), Anna University R2021 (CGPA × 10, clause 15.5.3). Universities without a published, readable formula are left out on purpose.
Exam age limits: UPSC CSE 2026 (21–32 on 1 Aug 2026) and SSC CHSL 2025 (18–27 on 1 Jan 2026), from the official notices. General category only; relaxations are not applied.
Inputs and outputs are not logged or stored. There are no sessions.
Text and numbers only. There are deliberately no image or PDF tools: those run only in the browser at tools.cuelark.com, so files never leave the user's device.
The rate limiter counts requests per IP and keeps no request content.
Protocol versions: 2025-11-25, 2025-06-18, 2025-03-26, 2024-11-05.
Methods: initialize, ping, tools/list, tools/call, resources/list, prompts/list and notifications. JSON-RPC batches of up to 20 messages; bodies up to 1 MB.
GET /mcp with Accept: text/event-stream returns 405 (no server-initiated stream). A browser GET shows the docs page.
npx @modelcontextprotocol/inspector --cli https://tools.cuelark.com/mcp --transport http --method tools/list
npx @modelcontextprotocol/inspector --cli https://tools.cuelark.com/mcp --transport http \
--method tools/call --tool-name cgpa_convert --tool-arg scheme=vtu --tool-arg cgpa=7.8MIT © Cuelark
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