Plumbkit MCP

Plumbkit provides exact, instant utilities for AI agents, handling tasks that models often get wrong. It offers tools for precise date and time calculations, including time zones and business days, arithmetic math, unit conversions, and text processing. It also includes robust validation for emails, phone numbers, URLs, and IBANs, as well as JSON repair and schema validation capabilities.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-18Operated by Plumbkit

MCP endpoint (Streamable HTTP)

https://plumbkit.dev/mcp

Vendor documentation

What you can do with it

Convert dates between time zones with correct DST handling
Calculate exact time differences or add durations to dates
Validate email addresses, phone numbers, and URLs
Repair malformed JSON and validate against JSON Schema

Tools advertised by the last live check:

current_time
convert_timezone
date_add
date_diff
business_days
calculate
convert_units
text_stats
hash_text
regex_test
validate_email
validate_phone
validate_url
validate_iban
json_repair
json_schema_validate

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http plumbkit-mcp https://plumbkit.dev/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add plumbkit-mcp --url https://plumbkit.dev/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable plumbkit-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "plumbkit-mcp": {
      "url": "https://plumbkit.dev/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "plumbkit-mcp": {
      "type": "streamableHttp",
      "url": "https://plumbkit.dev/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start plumbkit-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "plumbkit-mcp": {
      "type": "http",
      "url": "https://plumbkit.dev/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http plumbkit-mcp https://plumbkit.dev/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "plumbkit-mcp": {
      "url": "https://plumbkit.dev/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "plumbkit-mcp": {
      "serverUrl": "https://plumbkit.dev/mcp"
    }
  }
}

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