MCP MeasureMCP Measure

index observed

Cleanor

Zero-auth MCP: image optimize, cited storage/format data, and dev utilities LLMs get wrong.

Should I use this

Quality & Safety

A
Description quality
96%
Schema completeness
98%
Naming quality
83%
Poisoning risk
80%
Permission match
90%
Protocol compliance
100%

Findings (6)

  • HIGHTool poisoning patterns detected
  • MEDIUMTool 'placeholder_image' description contains placeholder textin placeholder_image
  • LOWTool 'base64' description lacks action verbin base64
  • LOWTool 'slugify' description lacks action verbin slugify
  • LOWTool 'url_parse' suggests web access but openWorldHint=falsein url_parse
  • INFOTool description contains placeholder or incomplete textin placeholder_image

Based on automated analysis of tool definitions and protocol compliance.

Context Cost

~6,141Tokens (tool definitions)
~2.3 KBTypical response size
Significant attention impact (4.80% of 128k context)

This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.

Install

One-Click Install

Add this to your `claude_desktop_config.json` file:

{
  "mcpServers": {
    "cleanor": {
      "command": "npx",
      "args": [
        "@cleanor/mcp"
      ]
    }
  }
}

Runnable packages

npm@cleanor/mcp0.6.1stdio

Remote endpoints

https://mcp.cleanor.app/mcpstreamable-http

What it can do

Tool inventory

Tools (22)

🟢 Read-only🟡 Write🔴 Delete⚪ Unknown
🟢optimize_image(image_url, format, width, quality)

Fetch an image from a public URL and re-encode it smaller (WebP/AVIF/JPEG), optionally resizing to a target width. Returns the optimized image plus before/after byte sizes. Use this when an AI-generated or dropped-in asset (hero image, screenshot, illustration) is too large to ship.

Input Schema

{
  "type": "object",
  "properties": {
    "image_url": {
      "type": "string",
      "format": "uri",
      "description": "Public URL of the source image (PNG/JPEG/WebP/AVIF/GIF)."
    },
    "format": {
      "type": "string",
      "enum": [
        "webp",
        "avif",
        "jpeg"
      ],
      "default": "webp",
      "description": "Output format. webp = best browser support; avif = smallest; jpeg = universal."
    },
    "width": {
      "type": "integer",
      "minimum": 16,
      "maximum": 4096,
      "description": "Resize to this width in px, preserving aspect ratio. Omit to keep original size."
    },
    "quality": {
      "type": "integer",
      "minimum": 1,
      "maximum": 100,
      "default": 80,
      "description": "Encode quality 1-100 (80 is a good default)."
    }
  },
  "required": [
    "image_url"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "format": {
      "type": "string",
      "description": "Output image format."
    },
    "original_bytes": {
      "type": "number"
    },
    "optimized_bytes": {
      "type": "number"
    },
    "saved_pct": {
      "type": "number",
      "description": "Percent smaller than the original."
    },
    "mime_type": {
      "type": "string"
    }
  },
  "required": [
    "format",
    "original_bytes",
    "optimized_bytes",
    "saved_pct",
    "mime_type"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢storage_capacity(storage_gb, content)

How many photos or minutes of video actually fit in a given storage size, corrected for real OS/filesystem overhead. Backed by Cleanor Labs measured per-item sizes. Use for realistic sample copy, dashboards, or "how many photos fit in 128 GB" answers.

Input Schema

{
  "type": "object",
  "properties": {
    "storage_gb": {
      "type": "number",
      "minimum": 1,
      "maximum": 4096,
      "description": "Advertised storage size in GB (e.g. 64, 128, 256, 512)."
    },
    "content": {
      "type": "string",
      "enum": [
        "photos",
        "video"
      ],
      "default": "photos",
      "description": "What to count."
    }
  },
  "required": [
    "storage_gb"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "storage_gb": {
      "type": "number"
    },
    "usable_gb": {
      "type": "number",
      "description": "Usable GB after OS/filesystem overhead."
    },
    "content": {
      "type": "string"
    },
    "breakdown": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "label": {
            "type": "string"
          },
          "count": {
            "type": "number"
          },
          "unit": {
            "type": "string"
          }
        },
        "required": [
          "label",
          "count",
          "unit"
        ],
        "additionalProperties": false
      },
      "description": "How many of each item fit."
    }
  },
  "required": [
    "storage_gb",
    "usable_gb",
    "content",
    "breakdown"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢image_format_savings(format, quality)

How much smaller WebP, AVIF or JPEG XL are than JPEG at matched perceptual quality, from Cleanor Labs’ controlled benchmark. Also reports the "HEIC conversion tax" (converting an iPhone HEIC to JPG/PNG makes it bigger). Use to justify a format choice when building a site or app.

Input Schema

{
  "type": "object",
  "properties": {
    "format": {
      "type": "string",
      "enum": [
        "webp",
        "avif",
        "jxl"
      ],
      "default": "avif",
      "description": "Target format to compare against JPEG."
    },
    "quality": {
      "type": "string",
      "enum": [
        "web",
        "high"
      ],
      "default": "web",
      "description": "web = typical web quality (SSIM 0.95); high = near-lossless (SSIM 0.98)."
    }
  },
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "format": {
      "type": "string"
    },
    "quality": {
      "type": "string"
    },
    "percent_smaller_than_jpeg": {
      "type": "number"
    },
    "all_formats": {
      "type": "object",
      "properties": {
        "avif": {
          "type": "number"
        },
        "webp": {
          "type": "number"
        },
        "jxl": {
          "type": "number"
        }
      },
      "required": [
        "avif",
        "webp",
        "jxl"
      ],
      "additionalProperties": false
    },
    "source": {
      "type": "string"
    }
  },
  "required": [
    "format",
    "quality",
    "percent_smaller_than_jpeg",
    "all_formats",
    "source"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢qr_code(text, ecc, size)

Encode text or a URL as a QR code and return a crisp, dependency-free SVG you can paste straight into a page, deck or doc.

Input Schema

{
  "type": "object",
  "properties": {
    "text": {
      "type": "string",
      "minLength": 1,
      "maxLength": 2000,
      "description": "Text or URL to encode."
    },
    "ecc": {
      "type": "string",
      "enum": [
        "L",
        "M",
        "Q",
        "H"
      ],
      "default": "M",
      "description": "Error-correction level: L=7%, M=15%, Q=25%, H=30% recoverable."
    },
    "size": {
      "type": "integer",
      "minimum": 64,
      "maximum": 1024,
      "default": 320,
      "description": "SVG pixel size."
    }
  },
  "required": [
    "text"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "svg": {
      "type": "string",
      "description": "The QR code as SVG markup."
    }
  },
  "required": [
    "svg"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢hash(input, algorithm)

Compute a cryptographic hash of text (SHA-1, SHA-256, SHA-384 or SHA-512) and return the hex digest. Use for checksums, cache keys, or verifying content. MD5 is intentionally not offered (broken, and unavailable in Web Crypto). LLMs cannot compute these reliably by hand, so always use this tool instead of guessing.

Input Schema

{
  "type": "object",
  "properties": {
    "input": {
      "type": "string",
      "minLength": 1,
      "maxLength": 100000,
      "description": "Text to hash (UTF-8)."
    },
    "algorithm": {
      "type": "string",
      "enum": [
        "sha-256",
        "sha-1",
        "sha-384",
        "sha-512"
      ],
      "default": "sha-256",
      "description": "Hash algorithm. Default sha-256."
    }
  },
  "required": [
    "input"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "algorithm": {
      "type": "string",
      "description": "The hash algorithm used."
    },
    "hex": {
      "type": "string",
      "description": "The hex-encoded digest."
    }
  },
  "required": [
    "algorithm",
    "hex"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢uuid(version, count)

Generate one or more UUIDs. v4 is fully random; v7 is time-sortable (recommended for database keys). LLMs cannot produce cryptographically random or correctly-formatted UUIDs, so always use this tool.

Input Schema

{
  "type": "object",
  "properties": {
    "version": {
      "type": "string",
      "enum": [
        "v4",
        "v7"
      ],
      "default": "v4",
      "description": "UUID version. v7 = time-ordered."
    },
    "count": {
      "type": "integer",
      "minimum": 1,
      "maximum": 100,
      "default": 1,
      "description": "How many to generate."
    }
  },
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "version": {
      "type": "string",
      "description": "UUID version generated."
    },
    "uuids": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "The generated UUIDs."
    }
  },
  "required": [
    "version",
    "uuids"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢base64(input, mode, url_safe)

Encode text to Base64 or decode Base64 back to text (UTF-8 safe). Supports URL-safe alphabet. Use whenever you need to encode/decode data URIs, tokens, or config values instead of guessing the bytes.

Input Schema

{
  "type": "object",
  "properties": {
    "input": {
      "type": "string",
      "minLength": 1,
      "maxLength": 100000,
      "description": "Text to encode, or Base64 to decode."
    },
    "mode": {
      "type": "string",
      "enum": [
        "encode",
        "decode"
      ],
      "default": "encode",
      "description": "Direction."
    },
    "url_safe": {
      "type": "boolean",
      "default": false,
      "description": "Use URL-safe alphabet (-_ instead of +/, no padding)."
    }
  },
  "required": [
    "input"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "mode": {
      "type": "string",
      "description": "encode or decode."
    },
    "result": {
      "type": "string",
      "description": "The encoded or decoded text."
    }
  },
  "required": [
    "mode",
    "result"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢json_format(input, mode, sort_keys)

Validate JSON and pretty-print or minify it, optionally sorting object keys. Returns a precise parse error (with position) if invalid. Use to check and clean JSON instead of eyeballing it.

Input Schema

{
  "type": "object",
  "properties": {
    "input": {
      "type": "string",
      "minLength": 1,
      "maxLength": 100000,
      "description": "JSON text."
    },
    "mode": {
      "type": "string",
      "enum": [
        "pretty",
        "minify"
      ],
      "default": "pretty",
      "description": "pretty = 2-space indent; minify = single line."
    },
    "sort_keys": {
      "type": "boolean",
      "default": false,
      "description": "Sort object keys alphabetically (deep)."
    }
  },
  "required": [
    "input"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "valid": {
      "type": "boolean",
      "description": "Whether the input was valid JSON."
    },
    "formatted": {
      "type": "string",
      "description": "The formatted JSON text."
    }
  },
  "required": [
    "valid",
    "formatted"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢jwt_decode(token)

Decode a JSON Web Token into its header and payload so you can inspect claims (iss, exp, sub, scopes). The signature is NOT verified and no secret is required or stored. Use to read a token during debugging.

Input Schema

{
  "type": "object",
  "properties": {
    "token": {
      "type": "string",
      "minLength": 1,
      "maxLength": 100000,
      "description": "The JWT (three dot-separated segments)."
    }
  },
  "required": [
    "token"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "header": {
      "description": "The decoded JWT header object."
    },
    "payload": {
      "description": "The decoded JWT payload (claims)."
    },
    "exp_iso": {
      "type": "string",
      "description": "Expiry as ISO 8601, if present."
    },
    "expired": {
      "type": "boolean",
      "description": "Whether the token is past its exp, if present."
    }
  },
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢color(value)

Convert a color (hex, rgb() or hsl()) and return hex, RGB and HSL representations at once. Use when picking or translating colors for CSS, design tokens or themes.

Input Schema

{
  "type": "object",
  "properties": {
    "value": {
      "type": "string",
      "minLength": 1,
      "maxLength": 64,
      "description": "A color: \"#3b82f6\", \"rgb(59,130,246)\" or \"hsl(217,91%,60%)\"."
    }
  },
  "required": [
    "value"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "hex": {
      "type": "string"
    },
    "rgb": {
      "type": "string"
    },
    "hsl": {
      "type": "string"
    }
  },
  "required": [
    "hex",
    "rgb",
    "hsl"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢slugify(input, separator)

Turn a title or phrase into a clean, URL-safe slug (lowercase, hyphenated, accents stripped). Use when generating page paths, filenames or anchor IDs.

Input Schema

{
  "type": "object",
  "properties": {
    "input": {
      "type": "string",
      "minLength": 1,
      "maxLength": 2000,
      "description": "Text to slugify."
    },
    "separator": {
      "type": "string",
      "enum": [
        "-",
        "_"
      ],
      "default": "-",
      "description": "Word separator."
    }
  },
  "required": [
    "input"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "slug": {
      "type": "string",
      "description": "The URL-safe slug."
    }
  },
  "required": [
    "slug"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢count(input)

Accurately count characters (Unicode code points), UTF-16 units, words, lines and UTF-8 bytes in text. LLMs are notoriously bad at counting, so always use this tool for "how many characters/words" questions.

Input Schema

{
  "type": "object",
  "properties": {
    "input": {
      "type": "string",
      "minLength": 0,
      "maxLength": 100000,
      "description": "Text to measure."
    }
  },
  "required": [
    "input"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "characters": {
      "type": "number",
      "description": "Unicode code points."
    },
    "utf16_units": {
      "type": "number"
    },
    "words": {
      "type": "number"
    },
    "lines": {
      "type": "number"
    },
    "bytes": {
      "type": "number",
      "description": "UTF-8 bytes."
    }
  },
  "required": [
    "characters",
    "utf16_units",
    "words",
    "lines",
    "bytes"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢regex_test(pattern, input, flags)

Test a JavaScript regular expression against sample text and return whether it matches, plus every match with its captured groups and index. Use to verify a pattern instead of reasoning about it in your head. Input and pattern are length-capped to keep it fast and safe.

Input Schema

{
  "type": "object",
  "properties": {
    "pattern": {
      "type": "string",
      "minLength": 1,
      "maxLength": 1000,
      "description": "The regex pattern (without slashes)."
    },
    "input": {
      "type": "string",
      "minLength": 0,
      "maxLength": 20000,
      "description": "Text to test against."
    },
    "flags": {
      "type": "string",
      "maxLength": 8,
      "default": "g",
      "description": "Regex flags, e.g. \"gi\". Allowed: g i m s u y d."
    }
  },
  "required": [
    "pattern",
    "input"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "matched": {
      "type": "boolean",
      "description": "Whether the pattern matched at all."
    },
    "match_count": {
      "type": "number"
    },
    "truncated": {
      "type": "boolean",
      "description": "True if results were capped at 100."
    },
    "matches": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "index": {
            "type": "number"
          },
          "match": {
            "type": "string"
          },
          "groups": {
            "type": "array",
            "items": {
              "type": [
                "string",
                "null"
              ]
            }
          }
        },
        "required": [
          "index",
          "match",
          "groups"
        ],
        "additionalProperties": false
      },
      "description": "Each match with its start index and captured groups."
    }
  },
  "required": [
    "matched",
    "match_count",
    "truncated",
    "matches"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢cron_describe(expression)

Parse a standard 5-field cron expression (minute hour day-of-month month day-of-week) into a plain-English breakdown and the next few run times in UTC. Use to sanity-check a schedule instead of guessing what the fields mean.

Input Schema

{
  "type": "object",
  "properties": {
    "expression": {
      "type": "string",
      "minLength": 1,
      "maxLength": 200,
      "description": "A 5-field cron expression, e.g. \"30 2 * * 1-5\"."
    }
  },
  "required": [
    "expression"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "minute": {
      "type": "string"
    },
    "hour": {
      "type": "string"
    },
    "day_of_month": {
      "type": "string"
    },
    "month": {
      "type": "string"
    },
    "day_of_week": {
      "type": "string"
    },
    "next_runs": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Next run times in UTC ISO 8601."
    }
  },
  "required": [
    "minute",
    "hour",
    "day_of_month",
    "month",
    "day_of_week",
    "next_runs"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢unit_convert(value, from, to)

Convert a value between units of length, mass, data size, time, speed or temperature. Supported units: mm, cm, m, km, in, ft, yd, mi, nmi, mg, g, kg, t, oz, lb, st, bit, byte, kb, kib, mb, mib, gb, gib, tb, tib, ms, s, min, h, day, week, mps, kph, mph, fps, knot, c, f, k. Use for exact conversions instead of approximating.

Input Schema

{
  "type": "object",
  "properties": {
    "value": {
      "type": "number",
      "description": "The numeric value to convert."
    },
    "from": {
      "type": "string",
      "minLength": 1,
      "maxLength": 8,
      "description": "Source unit (e.g. \"km\", \"lb\", \"mib\", \"c\")."
    },
    "to": {
      "type": "string",
      "minLength": 1,
      "maxLength": 8,
      "description": "Target unit (must be the same category as \"from\")."
    }
  },
  "required": [
    "value",
    "from",
    "to"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "value": {
      "type": "number"
    },
    "from": {
      "type": "string"
    },
    "to": {
      "type": "string"
    },
    "result": {
      "type": "number"
    },
    "category": {
      "type": "string"
    }
  },
  "required": [
    "value",
    "from",
    "to",
    "result",
    "category"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢datetime(input, timezone)

Get the current date/time, or convert a given timestamp, into a target IANA timezone with ISO, Unix and human-readable forms. Pass a Unix timestamp (seconds or ms) or an ISO string as input; omit it for "now". LLMs cannot know the real current time, so use this instead of guessing.

Input Schema

{
  "type": "object",
  "properties": {
    "input": {
      "type": "string",
      "maxLength": 64,
      "description": "Optional: a Unix timestamp (s or ms) or ISO date string. Omit for the current time."
    },
    "timezone": {
      "type": "string",
      "maxLength": 64,
      "default": "UTC",
      "description": "IANA timezone, e.g. \"America/New_York\" or \"UTC\"."
    }
  },
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "timezone": {
      "type": "string"
    },
    "local": {
      "type": "string",
      "description": "Human-readable local time in the timezone."
    },
    "iso_utc": {
      "type": "string"
    },
    "unix_s": {
      "type": "number"
    },
    "unix_ms": {
      "type": "number"
    }
  },
  "required": [
    "timezone",
    "local",
    "iso_utc",
    "unix_s",
    "unix_ms"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢url_parse(url)

Break a URL into its components: scheme, host, port, path, decoded query parameters and fragment. Use to inspect or debug a URL instead of parsing it by eye.

Input Schema

{
  "type": "object",
  "properties": {
    "url": {
      "type": "string",
      "minLength": 1,
      "maxLength": 4000,
      "description": "The URL to parse (absolute, with scheme)."
    }
  },
  "required": [
    "url"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "scheme": {
      "type": "string"
    },
    "username": {
      "type": "string"
    },
    "host": {
      "type": "string"
    },
    "port": {
      "type": "string",
      "description": "Port, or empty if the scheme default."
    },
    "path": {
      "type": "string"
    },
    "query": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "key": {
            "type": "string"
          },
          "value": {
            "type": "string"
          }
        },
        "required": [
          "key",
          "value"
        ],
        "additionalProperties": false
      }
    },
    "fragment": {
      "type": "string"
    }
  },
  "required": [
    "scheme",
    "host",
    "port",
    "path",
    "query",
    "fragment"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢base_convert(value, from_base, to_base)

Convert an integer between number bases 2–36 (e.g. hex to binary, decimal to base-36). Arbitrary precision via BigInt, so large values stay exact. Use for radix conversions instead of doing them by hand.

Input Schema

{
  "type": "object",
  "properties": {
    "value": {
      "type": "string",
      "minLength": 1,
      "maxLength": 2000,
      "description": "The number, in from_base (e.g. \"ff\", \"1010\", \"255\")."
    },
    "from_base": {
      "type": "integer",
      "minimum": 2,
      "maximum": 36,
      "default": 10,
      "description": "Base of the input (2–36)."
    },
    "to_base": {
      "type": "integer",
      "minimum": 2,
      "maximum": 36,
      "default": 16,
      "description": "Base to convert to (2–36)."
    }
  },
  "required": [
    "value"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "input": {
      "type": "string"
    },
    "from_base": {
      "type": "number"
    },
    "to_base": {
      "type": "number"
    },
    "result": {
      "type": "string",
      "description": "The value in to_base."
    },
    "decimal": {
      "type": "string",
      "description": "The value in base 10."
    }
  },
  "required": [
    "input",
    "from_base",
    "to_base",
    "result",
    "decimal"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢diff(a, b)

Compute a line-by-line diff between two texts, marking removed lines with "-", added with "+" and unchanged with two spaces, plus a change count. Use to see exactly what changed instead of comparing by eye. Capped at 1000 lines per side.

Input Schema

{
  "type": "object",
  "properties": {
    "a": {
      "type": "string",
      "minLength": 0,
      "maxLength": 100000,
      "description": "The original (\"before\") text."
    },
    "b": {
      "type": "string",
      "minLength": 0,
      "maxLength": 100000,
      "description": "The updated (\"after\") text."
    }
  },
  "required": [
    "a",
    "b"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "changed": {
      "type": "boolean"
    },
    "added": {
      "type": "number"
    },
    "removed": {
      "type": "number"
    },
    "diff": {
      "type": "string",
      "description": "The line diff (+/-/space prefixed), empty if identical."
    }
  },
  "required": [
    "changed",
    "added",
    "removed",
    "diff"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢hmac(message, secret, algorithm, encoding)

Compute an HMAC (keyed hash) of a message with a secret, using SHA-1/256/384/512, returned as hex or Base64. Use to sign webhook payloads or verify a signature instead of guessing. LLMs cannot compute this by hand.

Input Schema

{
  "type": "object",
  "properties": {
    "message": {
      "type": "string",
      "minLength": 0,
      "maxLength": 100000,
      "description": "The message to sign (UTF-8)."
    },
    "secret": {
      "type": "string",
      "minLength": 1,
      "maxLength": 4096,
      "description": "The shared secret key (UTF-8)."
    },
    "algorithm": {
      "type": "string",
      "enum": [
        "sha-256",
        "sha-1",
        "sha-384",
        "sha-512"
      ],
      "default": "sha-256",
      "description": "Hash algorithm."
    },
    "encoding": {
      "type": "string",
      "enum": [
        "hex",
        "base64"
      ],
      "default": "hex",
      "description": "Output encoding."
    }
  },
  "required": [
    "message",
    "secret"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "algorithm": {
      "type": "string"
    },
    "encoding": {
      "type": "string"
    },
    "signature": {
      "type": "string",
      "description": "The HMAC in the requested encoding."
    }
  },
  "required": [
    "algorithm",
    "encoding",
    "signature"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢placeholder_image(width, height, bg, color, text)

Generate a lightweight SVG placeholder image at any size, with an optional label and custom background/text colors. Dependency-free, pastes straight into a page or mockup. Use for wireframes and design stubs instead of hotlinking a placeholder service.

Input Schema

{
  "type": "object",
  "properties": {
    "width": {
      "type": "integer",
      "minimum": 1,
      "maximum": 4000,
      "default": 600,
      "description": "Width in pixels."
    },
    "height": {
      "type": "integer",
      "minimum": 1,
      "maximum": 4000,
      "default": 400,
      "description": "Height in pixels."
    },
    "bg": {
      "type": "string",
      "maxLength": 32,
      "default": "#e5e7eb",
      "description": "Background color (hex, rgb() or hsl())."
    },
    "color": {
      "type": "string",
      "maxLength": 32,
      "default": "#6b7280",
      "description": "Text color."
    },
    "text": {
      "type": "string",
      "maxLength": 120,
      "description": "Label text. Defaults to the dimensions, e.g. \"600×400\"."
    }
  },
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "svg": {
      "type": "string",
      "description": "The SVG markup."
    },
    "width": {
      "type": "number"
    },
    "height": {
      "type": "number"
    }
  },
  "required": [
    "svg",
    "width",
    "height"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢color_palette(color, harmony)

Build a harmonious color palette from a base color using color-theory rules (complementary, analogous, triadic, tetradic, or monochromatic). Returns each color as hex and HSL. Use to derive a theme or design tokens from one brand color.

Input Schema

{
  "type": "object",
  "properties": {
    "color": {
      "type": "string",
      "minLength": 1,
      "maxLength": 64,
      "description": "Base color: \"#3b82f6\", \"rgb(...)\" or \"hsl(...)\"."
    },
    "harmony": {
      "type": "string",
      "enum": [
        "complementary",
        "analogous",
        "triadic",
        "tetradic",
        "monochromatic"
      ],
      "default": "analogous",
      "description": "Color-harmony rule."
    }
  },
  "required": [
    "color"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Output Schema

{
  "type": "object",
  "properties": {
    "harmony": {
      "type": "string"
    },
    "base": {
      "type": "string",
      "description": "The base color as hex."
    },
    "colors": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "hex": {
            "type": "string"
          },
          "hsl": {
            "type": "string"
          }
        },
        "required": [
          "hex",
          "hsl"
        ],
        "additionalProperties": false
      }
    }
  },
  "required": [
    "harmony",
    "base",
    "colors"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

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