RedBison MCP server

• Registry namedev.redbison/mcpverified in the MCP registry

The registry name sits under redbison.dev. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

• Stateanswerschecked 2026-10-30
• Tools82
• Server calls itselfredbison-mcp
• Server version2.1.0
• Protocol version2025-06-18

On 2026-10-30 the server answered initialize and tools/list without a sign-in. First answer in 3880 ms.

• Its tools do every use case we checked: Remove duplicate lines from a text list; Format and validate JSON or SQL documents; Convert CSV data into JSON.
• Checked on 5 of the 7 days it takes to judge reliability.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

• INITE MCP scoreafter a weeka score needs 7 daily checks: 5 so far
• What an agent can do with it3 of 3 use cases
• Answeredmeasuring5 of the 7 daily checks it takes to print a share
• Median first answer3591 ms
• Space in an agent's context≈ 17,258 tokensthe definitions of all its tools (82), which an agent carries on every turn
• Tool definitionsA · 98 of 100
• Typed results0 of 82 toolsdeclared outputSchema: results come typed, read once

• Parameters without a description: in 10 of 82

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

• search_tools

  Search RedBison's 500+ tools by keyword: developer utilities, file and media converters, and finance, health, math and engineering calculators. Returns a ranked list with each tool's canonical URL and, when one exists, its in-depth guide…

• get_tool

  Get full metadata for a specific RedBison tool by its id (slug). Returns: Full JSON metadata for the tool: { id, name, description, url, category, subcategory?, keywords[] }. Example input: {"id":"jwt-decoder"}

• list_categories

  List all tool categories and subcategories available on RedBison. Returns: JSON array of { category, count } entries covering the full RedBison catalog. Example input: {}

• health

  Return server status, name, version, and uptime info. Use this to monitor the MCP server. Returns: JSON { status, name, version, startedAt, timestamp }. Example input: {}

• base64_encode

  Base64-encode a UTF-8 string. Returns: Base64-encoded string (UTF-8 safe). Example input: {"text":"hello world"}

• base64_decode

  Base64-decode a string back to UTF-8. Returns: UTF-8 decoded plain text. Example input: {"text":"aGVsbG8gd29ybGQ="}

• url_encode

  Percent-encode a string for use in URLs. Returns: Percent-encoded string suitable for URL query values. Example input: {"text":"hello world & friends"}

• url_decode

  Percent-decode a URL-encoded string. Returns: Percent-decoded plain text. Example input: {"text":"hello%20world%20%26%20friends"}

• json_format

  Pretty-print a JSON string with a chosen indent size. Returns: Pretty-printed JSON string with the requested indent, or an error message if the input is invalid. Example input: {"text":"{\"a\":1,\"b\":[2,3]}","indent":2} On error…

• json_validate

  Validate a JSON string. Returns { valid, error? }. Returns: JSON { valid: boolean, error?: string }. Example input: {"text":"{\"a\":1}"} On error, includes hint: Pass the JSON string as `text`.

• csv_to_json

  Parse CSV text into JSON. Uses the first row as headers unless header=false. Returns: JSON array of row objects keyed by the header row. Example input: {"text":"name,age\nAda,36\nGrace,85","delimiter":","} On error, includes hint: `text`…

• json_to_csv

  Convert an array of JSON objects to CSV. Columns are inferred from the union of keys. Returns: CSV string with a header row derived from the first object's keys. Example input…

• json_to_yaml

  Convert a JSON string to YAML. Returns: YAML representation of the parsed JSON value. Example input: {"json":"{\"name\":\"Ada\",\"skills\":[\"math\",\"logic\"]}"} On error, includes hint: Pass the JSON as `json` (a stringified JSON…

• yaml_to_json

  Convert simple YAML (maps, lists, scalars, flow {} / []) to JSON. Anchors, tags, and complex block scalars are not supported. Returns: Pretty-printed JSON built from the YAML input. Example input: {"yaml":"name: Ada\nskills:\n - math\n…

• tsv_parse

  Parse tab-separated values into JSON. First row is treated as header unless header=false. Returns: JSON array of row objects derived from the TSV header row. Example input: {"text":"name\tage\nAda\t36\nGrace\t85"} On error, includes hint…

• html_beautify

  Pretty-print an HTML fragment. Returns: Pretty-printed HTML string with normalized indentation. Example input: {"html":"<div><p>hi</p><p>there</p></div>","indent":2}

• xml_beautify

  Pretty-print an XML document. Returns: Pretty-printed XML string with normalized indentation. Example input: {"xml":"<root><a>1</a><b>2</b></root>","indent":2}

• yaml_beautify

  Normalize YAML indentation and whitespace. Returns: Normalized YAML string (2-space indent, collapsed blank lines). Example input: {"yaml":"a: 1\nb: 2\n\n\nc: 3"}

• sql_beautify

  Format a SQL query with keyword uppercasing and line breaks before major clauses. Returns: Formatted SQL query with keywords on new lines. Example input: {"sql":"select id,name from users where active=true order by name"}

• slugify

  Convert text to a URL-safe slug. Returns: URL-safe slug (lowercase, dashes). Example input: {"text":"Hello, World! 2026"}

• case_convert

  Convert text between upper, lower, title, camel, pascal, snake, and kebab case. Returns: String converted to the requested case. Example input: {"text":"hello world example","style":"camel"} On error, includes hint: `style` must be one…

• escape_characters

  Escape or unescape a string for JSON, HTML, XML, JavaScript, or SQL. Returns: Escaped or unescaped string for the chosen format. Example input: {"text":"He said \"hi\"","format":"json","mode":"escape"} On error, includes hint: `mode` is…

• remove_duplicate_lines

  Remove duplicate lines from text while preserving first-occurrence order. Returns: Text with duplicate lines removed (order preserved). Example input: {"text":"apple\nbanana\napple\ncherry","caseInsensitive":false,"trim":true}

• find_duplicate_entries

  Return lines that appear more than once in the input, with their occurrence counts. Returns: JSON array of { value, count } for lines appearing more than once. Example input: {"text":"apple\nbanana\napple\ncherry\nbanana"}

• remove_extra_spaces

  Collapse runs of whitespace inside each line to a single space and trim ends. Returns: Text with runs of whitespace collapsed to a single space. Example input: {"text":"hello world foo"}

• remove_empty_lines

  Strip blank / whitespace-only lines from the input. Returns: Text with blank lines removed. Example input: {"text":"one\n\ntwo\n\n\nthree"}

• lines_to_comma

  Join lines with a separator (comma by default). Empty lines are skipped. Returns: Single-line string with items joined by the chosen separator. Example input: {"text":"apple\nbanana\ncherry","separator":", ","quote":false}

• comma_to_lines

  Split a delimited string into one item per line. Returns: Multi-line string, one item per line. Example input: {"text":"apple, banana, cherry","separator":",","trim":true}

• jwt_decode

  Decode a JWT and return its header + payload. Does NOT verify the signature. Returns: JSON with decoded { header, payload, signature } sections of the JWT. Example input: {"token":"eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiIxMjMifQ.abc"} On error…

• hash

  Compute a cryptographic hash of a string. Returns: Hex digest of the input using the requested algorithm. Example input: {"text":"hello world","algorithm":"sha256"} On error, includes hint: `algorithm` must be one of: md5, sha1, sha256…

• hash_compare

  Hash two inputs with the same algorithm and compare them in constant time. Useful for verifying file integrity. Returns: JSON { match: boolean } computed with a constant-time comparison. Example input…

• uuid_generate

  Generate one or more v4 UUIDs. Returns: JSON array of v4 UUID strings. Example input: {"count":3} On error, includes hint: `count` must be an integer between 1 and 100.

• password_generate

  Generate a cryptographically random password. Choose length and character classes. Returns: Randomly generated password string. Example input: {"length":20,"uppercase":true,"lowercase":true,"digits":true,"symbols":true,"count":1} On…

• bcrypt_hash

  Hash a password with bcrypt. Returns: Bcrypt hash string (includes cost + salt). Example input: {"password":"s3cret!","cost":10} On error, includes hint: `cost` must be an integer between 4 and 12. Higher cost is exponentially slower.

• bcrypt_verify

  Check whether a password matches a bcrypt hash. Returns: JSON { match: boolean }. Example input: {"password":"s3cret!","hash":"$2a$10$abcdefghijklmnopqrstuv"} On error, includes hint: `hash` must be a full bcrypt string starting with…

• subnet_calculator

  Given a CIDR block (e.g. 10.0.0.0/24), return network, broadcast, netmask, first/last host, and host count. Returns: JSON with network, broadcast, first/last host, host count, and mask for the CIDR. Example input…

• ip_convert

  Convert an IPv4 address between dotted-decimal, integer, binary, and hex forms. Accepts any of those as input. Returns: JSON { decimal, integer, hex, binary } representations of the IPv4 address. Example input: {"value":"192.168.1.1"} On…

• epoch_convert

  Convert between Unix epoch seconds/milliseconds and ISO 8601. Pass a number to convert to ISO, or an ISO string to convert to epoch. Returns: JSON with ISO string, epoch seconds, epoch milliseconds, and a UTC-formatted representation…

• timezone_convert

  Convert a timestamp between two IANA timezones. Returns the wall-clock time in the target zone. Returns: JSON { utc, zone, local } with the timestamp rendered in the target IANA timezone. Example input…

• date_diff

  Compute the difference between two ISO 8601 timestamps in days, hours, minutes, and seconds. Returns: JSON with milliseconds, totalSeconds/Minutes/Hours/Days, and a { days, hours, minutes, seconds } breakdown. Example input…

• cron_validate

  Validate a standard 5-field cron expression (minute hour day month weekday). Returns a human-readable summary and any parse error. Returns: JSON { valid: boolean, nextRuns?: string[], error?: string }. Example input: {"expression":"*/5 *…

• regex_test

  Test a regular expression against text. Returns all matches and capture groups. Returns: JSON { matches: string[], count } of matches for the pattern. Example input: {"pattern":"\\d+","flags":"g","text":"order 42 shipped on day 7"} On…

• text_diff

  Compute a line-level diff between two strings. Returns a unified-style patch and per-line change list. Returns: JSON line-diff with { added, removed, unchanged } arrays. Example input: {"a":"line 1\nline 2\nline 3","b":"line 1\nline 2…

• list_compare

  Compare two newline-separated lists. Returns union, intersection, only-in-A, and only-in-B. Returns: JSON { union, intersection, onlyInA, onlyInB } arrays. Example input: {"a":"apple\nbanana\ncherry","b":"banana\ncherry\ndate"}

• color_convert

  Convert a color between hex, rgb, and hsl. Accepts inputs like '#3B82F6', 'rgb(59,130,246)', or 'hsl(217,91%,60%)'. Returns: JSON with hex, rgb, and hsl representations of the color. Example input: {"color":"#3b82f6"} On error, includes…

• contrast_check

  Compute the WCAG contrast ratio between two hex colors and report AA/AAA pass/fail for normal and large text. Returns: JSON { ratio, AA, AAA, AALarge, AAALarge } for the two colors. Example input…

• css_gradient

  Build a CSS linear or radial gradient string from color stops. Returns: CSS gradient string (linear or radial). Example input: {"type":"linear","angle":45,"stops":["#3b82f6","#8b5cf6"]} On error, includes hint: `type` is 'linear' or…

• random_name

  Generate random human names. Returns: JSON array of random human name strings. Example input: {"count":3}

• random_email

  Generate random-looking (non-deliverable) test email addresses. Returns: JSON array of random email address strings. Example input: {"count":3,"domain":"example.com"}

• random_number

  Generate cryptographically random numbers in a range. Returns: JSON array of generated numbers. Example input: {"min":1,"max":100,"count":5,"mode":"integer"}

• lorem_ipsum

  Generate placeholder lorem ipsum text. Returns: Lorem ipsum text of the requested size. Example input: {"unit":"paragraphs","count":2}

• emi_calculate

  Compute the equated monthly installment (EMI) for a loan. Returns: JSON { emi, totalInterest, totalPayment } for the loan. Example input: {"principal":500000,"annualRatePercent":8.5,"months":240}

• simple_interest

  Compute simple interest: I = P × r × t. Returns: JSON { interest, total } computed as P·r·t. Example input: {"principal":10000,"annualRatePercent":5,"years":3}

• compound_interest

  Compute compound interest: A = P(1 + r/n)^(nt). Returns: JSON { interest, total } computed as P(1+r/n)^(nt). Example input: {"principal":10000,"annualRatePercent":5,"years":10,"compoundsPerYear":12}

• bmi_calculate

  Calculate Body Mass Index in metric (kg/cm) or imperial (lb/in) units. Returns: JSON { bmi, category } (Underweight / Normal / Overweight / Obese). Example input: {"weight":70,"height":175,"units":"metric"}

• list_calculators

  List the calculators that run_calculator can execute (finance, health, maths, statistics, construction, science, everyday and engineering), with each one's inputs, units, defaults and an example. Filter with an optional search query…

• run_calculator

  Run any RedBison calculator by id with named inputs and get the result as JSON: mortgages and loans, savings and investing, pay and tax, body and fitness, maths, statistics, geometry, construction, science and engineering (beams, bolts…

• ascii_art_text

  Render text as a FIGlet ASCII art banner in one of 7 bundled fonts (Standard, Slant, Small, Big, Doom, ANSI Shadow, Mini), optionally wrapped at a column width and inside code comment markers. Printable ASCII only. The page at…

• barcode_check_digit

  Compute or validate the GS1 mod-10 check digit of an EAN-8, UPC-A, EAN-13 or ITF-14 (GTIN-8/12/13/14) number. Give the digits without the check digit to compute it, or the full code to validate it. Returns: JSON { digits, checkDigit…

• chmod_convert

  Convert Unix permissions between octal (755, 4755), symbolic (rwxr-xr-x) and ls -l strings, or apply a chmod expression such as 'go-w,u+x' to a starting mode. Explains each class, setuid/setgid/sticky bits and risky modes, and gives umask…

The first 60 of 82, as the server listed them.