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RedBison

dev.redbison/mcp in the official MCP registry. Endpoint https://mcp.redbison.dev/.

The registry describes it as: 500+ free tools over MCP: dev, text and security utilities, 230+ calculators. No sign-up.

Connect it

The endpoint answers MCP over HTTP; that is how we read it. Add it to your client:

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

{
  "mcpServers": {
    "redbison": {
      "url": "https://mcp.redbison.dev/"
    }
  }
}

code --add-mcp '{"name":"redbison","type":"http","url":"https://mcp.redbison.dev/"}'

Some servers ask you to sign in the first time a client connects, or want a key from the people who run them; the server's own docs say which.

Let Claude Code check servers as it adds them

With the free lazaretto-guard plugin installed, when Claude Code adds a server for you or writes one into an MCP config, the plugin reads the server's tools first and asks you if one of our rules matches. Install it, restart Claude Code, then ask it to run the command above.

claude plugin marketplace add jamesdfinance-dev/lazaretto-plugins
claude plugin install lazaretto-guard@lazaretto-plugins

Tools it advertises

search_tools get_tool list_categories health base64_encode base64_decode url_encode url_decode json_format json_validate csv_to_json json_to_csv json_to_yaml yaml_to_json tsv_parse html_beautify xml_beautify yaml_beautify sql_beautify slugify case_convert escape_characters remove_duplicate_lines find_duplicate_entries remove_extra_spaces remove_empty_lines lines_to_comma comma_to_lines jwt_decode hash hash_compare uuid_generate password_generate bcrypt_hash bcrypt_verify subnet_calculator ip_convert epoch_convert timezone_convert date_diff cron_validate regex_test text_diff list_compare color_convert contrast_check css_gradient random_name random_email random_number lorem_ipsum emi_calculate simple_interest compound_interest bmi_calculate list_calculators run_calculator ascii_art_text barcode_check_digit chmod_convert and 22 more

Tool changes

We compare every full read of this server with the one before. No change in what its tools say has been seen since we started keeping this record on 2026-10-30.

Fingerprint of its tools at our last full read (2026-11-01): bcb39b1d4a6a9e49. A client can hash the tools it is served the same way and compare; the full value and a hash per tool are in this page as JSON.

Run this server? Show the check in your README

The badge reflects the latest weekly read:

[![MCP tool check](https://lazaretto.dev/mcp-registry/dev-redbison-mcp/badge.svg)](https://lazaretto.dev/mcp-registry/dev-redbison-mcp)

How this was checked

Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.

To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.

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