Is Usesignal Claude Plugin free?

Yes, Usesignal Claude Plugin is free to use.

How do I install Usesignal Claude Plugin?

Usesignal Claude Plugin is a remote plugin. You do not need to install anything locally. Add the server URL to your AI app's MCP configuration and you are ready to go.

Is Usesignal Claude Plugin safe to use?

Yes. Usesignal Claude Plugin passed MCP Marketplace's automated security scan with a score of 10/10 (low risk). Every server on MCP Marketplace is security-scanned before it's listed; see the full security report on this page for the findings and permissions.

What AI apps work with Usesignal Claude Plugin?

Usesignal Claude Plugin uses the Model Context Protocol (MCP) and works with any MCP-compatible AI app, including Claude, ChatGPT / Codex, Gemini, Copilot, Cursor, and more.

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Usesignal Claude Plugin MCP Server

by Sanket Naik

Developer ToolsLow Risk10.0MCP RegistryRemote

Free

Server data from the Official MCP Registry

QR codes, JSON diff/format, hashes, JWT, cron, timestamps, placeholders, flowcharts, forms, regex.

About

QR codes, JSON diff/format, hashes, JWT, cron, timestamps, placeholders, flowcharts, forms, regex.

Remote endpoints: streamable-http: https://www.usesignal.dev/mcp

Security Report

10.0

Low Risk10.0Low Risk

Valid MCP server (1 strong, 1 medium validity signals). No known CVEs in dependencies. Imported from the Official MCP Registry.

12 tools verified · Open access · No issues found

Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.

Permissions Found in Source Code

Found by scanning the linked source code. This listing connects to a hosted endpoint, so none of this runs on your machine: it describes what the server software does where it is hosted.

HTTP Network Access

Connects to external APIs or services over the internet.

How to Connect

Remote Plugin

No local installation needed. Your AI client connects to the remote endpoint directly.

Add this to your MCP configuration to connect:

{
  "mcpServers": {
    "io-github-sanket-naik-usesignal": {
      "url": "https://www.usesignal.dev/mcp"
    }
  }
}

Documentation

View on GitHub

From the project's GitHub README.

useSignal for Claude

useSignal brings the developer tools from usesignal.dev into Claude. Each tool gives exact results for jobs that are easy to get subtly wrong by hand, such as hashes, cron schedules across time zones, scannable QR codes and large JSON diffs. An interactive workbench lets you preview, edit and export what each tool produces. No sign-in or API key is required.

Tools

Tool	What it does
`usesignal_generate_qr`	Builds a scannable QR code for a link, text, Wi-Fi network, contact card, email, SMS, phone number, WhatsApp chat or UPI payment. Returns an SVG file and a PNG preview.
`usesignal_diff_json`	Compares two JSON documents and lists every added, removed and changed value with its path. Numbers compare exactly.
`usesignal_format_json`	Validates, pretty-prints or minifies JSON, reports the exact line and column of errors, and repairs common mistakes such as trailing commas and single quotes.
`usesignal_encode_decode`	Base64 and URL encoding and decoding, MD5/SHA-1/SHA-256/SHA-512 hashes, and JWT decoding with readable expiry dates. JWT signatures are not verified.
`usesignal_explain_cron`	Explains a cron expression in plain English and lists its next run times in any time zone, including across daylight saving changes.
`usesignal_convert_timestamp`	Converts Unix seconds, Unix milliseconds or ISO dates into ISO, UTC, epoch and local time in any time zone.
`usesignal_placeholder_image`	Creates a placeholder image URL served by usesignal.dev, with HTML, Markdown and CSS snippets.
`usesignal_flowchart`	Turns code, arrow steps or Mermaid-style arrows into a flowchart, as Mermaid source and an SVG diagram.
`usesignal_generate_form`	Turns a JSON object into an editable form with HTML, React JSX, JSON Schema and config exports.
`usesignal_generate_colors`	Builds a brand shade scale and light/dark semantic tokens from a hex color, with measured text contrast and CSS, JSON and Tailwind exports.
`usesignal_test_regex`	Runs a JavaScript regular expression against sample text and expected cases, showing matches and capture groups.
`usesignal_open_workbench`	Opens an interactive preview of any result above where the host supports MCP Apps.

All tools are read-only and stateless. Every result includes a link to the matching full tool on usesignal.dev.

Install

Claude Code

claude plugin marketplace add sanket-naik/usesignal-claude-plugin
claude plugin install usesignal@usesignal

claude.ai and Claude Desktop: add it from the Claude directory, or go to Settings → Connectors → Add custom connector and enter https://www.usesignal.dev/mcp.

Try it

"Make a Wi-Fi QR code for network Studio Guest, password welcome2026."
"What changed between these two API responses?" (paste both JSON documents)
"When does 30 8 * * 1-5 run next in Asia/Kolkata?"
"SHA-256 of hello world."
"Decode this JWT and tell me when it expires."
"Give me a 1200×630 placeholder image for an Open Graph mockup."
"Turn these steps into a flowchart: Start -> Validate -> Save -> End."

What this plugin sends and where

This plugin contains no local code. It registers one remote MCP server, https://www.usesignal.dev/mcp, hosted by useSignal on Vercel. When Claude calls a tool, the tool arguments are sent to that server, processed in memory and returned. Arguments can include JSON documents, text to encode or hash, JWTs, QR code content such as Wi-Fi passwords, cron expressions and code for flowcharts. The server does not store inputs, keep accounts, send telemetry or call other APIs. Hosting-provider request logs are outside the plugin's control, so prefer test tokens and test passwords and avoid personal data.

Placeholder image URLs point at usesignal.dev, so anyone who views a page that uses one loads that image from useSignal's server.

Limits: form JSON up to 50 KB; JSON format and diff up to 200,000 characters per document; encoding and hashing up to 100,000 characters; regex patterns up to 1,000 characters with a 500 ms runtime limit; flowcharts up to 100 nodes.

Support: https://www.usesignal.dev/plugin-support.html
Privacy: https://www.usesignal.dev/plugin-privacy.html
Terms: https://www.usesignal.dev/plugin-terms.html

License

MIT

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4.8

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