MCP Server
MAD Synapse · Utils
art.maddegen.agent/synapse-util
What this MCP does
Provides developer utilities for hashing, encoding, JWT inspection, JSON Schema validation, diffs, Markdown conversion, cron schedules, QR codes, randomness, and unit conversion.
Capabilities
Tools
10
tools
cron_explain
Cron expression explain + next runs
Explain a cron expression in plain English and list its next N run times in any time zone — catch a schedule mistake before it fires at 3 am. Supports 5-field and 6-field (seconds) cron, ranges, steps, L/W/#, and nicknames (@daily, @hourly…). Price: free. Errors: returns isError with a message for invalid input or an upstream failure (not charged).
Read only
Open world
Idempotent
Input schema
{'type': 'object', 'required': ['expression'], 'properties': {'tz': {'type': 'string', 'default': 'UTC', 'description': 'IANA time zone for the next-run times. Default "UTC".'}, 'count': {'type': 'integer', 'default': 5, 'maximum': 50, 'minimum': 1, 'description': 'How many upcoming run times to list. Range 1-50. Default 5.'}, 'expression': {'type': 'string', 'description': 'Cron expression, 5 fields (or 6 with seconds), e.g. "*/15 9-17 * * 1-5".'}}, 'additionalProperties': False}
Output schema
{'type': 'object', 'properties': {'tz': {'type': ['string', 'null']}, 'valid': {'type': ['boolean', 'null']}, 'meaning': {'type': ['string', 'null']}, 'next_runs': {'type': 'array', 'items': {'type': ['object', 'null'], 'properties': {'utc': {'type': ['string', 'null']}, 'local': {'type': ['string', 'null']}}}}, 'expression': {'type': ['string', 'null']}}}
hash_encode
Hash + encode/decode
Hash data (SHA-256/512, SHA3, Keccak-256, BLAKE2, MD5, SHA-1, RIPEMD-160, HMAC) and convert between utf8, hex, base64, base64url and base58 — exact, in one call. Useful for signatures, content addressing, EVM selectors (keccak of a function signature), and decoding blobs agents are handed. Input can itself be hex/base64/base58. Price: free. Errors: returns isError with a message for invalid input or an upstream failure (not charged).
Read only
Open world
Idempotent
Input schema
{'type': 'object', 'required': ['input'], 'properties': {'input': {'type': 'string', 'x-raw': True, 'description': 'Data to hash or re-encode.'}, 'hashes': {'type': 'array', 'items': {'type': 'string'}, 'default': ['sha256', 'keccak256'], 'maxItems': 12, 'description': 'sha256, sha512, sha3-256, sha3-512, keccak256, blake2b512, blake2s256, md5, sha1, ripemd160. 0-12 items. Default ["sha256","keccak256"].'}, 'hmac_key': {'type': 'string', 'description': 'if set, HMAC instead of plain hash (utf8 key)'}, 'input_encoding': {'enum': ['utf8', 'hex', 'base64', 'base58'], 'type': 'string', 'default': 'utf8', 'description': 'How the input string is encoded. One of "utf8", "hex", "base64", "base58". Default "utf8".'}}, 'additionalProperties': False}
Output schema
{'type': 'object', 'properties': {'bytes': {'type': ['number', 'null']}, 'hashes': {'type': ['object', 'null'], 'properties': {'sha256': {'type': ['string', 'null']}, 'keccak256': {'type': ['string', 'null']}, 'evm_selector': {'type': ['string', 'null']}}}, 'encodings': {'type': ['object', 'null'], 'properties': {'hex': {'type': ['string', 'null']}, 'utf8': {'type': ['string', 'null']}, 'base58': {'type': ['string', 'null']}, 'base64': {'type': ['string', 'null']}, 'base64url': {'type': ['string', 'null']}}}}}
json_schema_validate
JSON Schema validator
Validate JSON data against a JSON Schema (draft-07/2019-09/2020-12, formats like email/uri/date-time) and get every error with its exact path — check tool I/O before acting on it. Ajv, strict about types, all errors reported. Pass data and schema as JSON values (or JSON strings). Price: free. Errors: returns isError with a message for invalid input or an upstream failure (not charged).
Read only
Open world
Idempotent
Input schema
{'type': 'object', 'required': ['data', 'schema'], 'properties': {'data': {'description': 'any JSON value (or a JSON string with parse_strings=true)'}, 'schema': {'type': 'object', 'description': 'The JSON Schema to validate against.'}, 'parse_strings': {'type': 'boolean', 'default': False, 'description': 'true = if data is a string, parse it as JSON first. Default false.'}}, 'additionalProperties': False}
Output schema
{'type': 'object', 'properties': {'valid': {'type': ['boolean', 'null']}, 'errors': {'type': 'array', 'items': {'type': ['object', 'null'], 'properties': {'path': {'type': ['string', 'null']}, 'params': {'type': ['object', 'null']}, 'keyword': {'type': ['string', 'null']}, 'message': {'type': ['string', 'null']}}}}, 'error_count': {'type': ['number', 'null']}}}
jwt_decode
JWT decoder
Decode a JSON Web Token's header and claims, show issued/expiry times in plain dates and whether it has expired — optionally verify an HS256/384/512 signature with a secret. Decoding does not need the key. Never paste production secrets into third-party tools you do not trust; verification here is local and nothing is stored or logged. Price: free. Errors: returns isError with a message for invalid input or an upstream failure (not charged).
Read only
Open world
Idempotent
Input schema
{'type': 'object', 'required': ['token'], 'properties': {'token': {'type': 'string', 'description': 'The JWT (three base64url parts). The signature is not verified.'}, 'secret': {'type': 'string', 'description': 'optional HMAC secret to verify HS* signatures'}}, 'additionalProperties': False}
Output schema
{'type': 'object', 'properties': {'header': {'type': ['object', 'null'], 'properties': {'alg': {'type': ['string', 'null']}, 'typ': {'type': ['string', 'null']}}}, 'expired': {'type': ['boolean', 'null']}, 'payload': {'type': ['object', 'null'], 'properties': {'exp': {'type': ['number', 'null']}, 'iat': {'type': ['number', 'null']}, 'sub': {'type': ['string', 'null']}}}, 'issued_at': {'type': ['string', 'null']}, 'signature': {'type': ['string', 'null']}, 'expires_at': {'type': ['string', 'null']}, 'not_before': {}, 'seconds_left': {'type': ['number', 'null']}, 'alg_none_warning': {}}}
markdown_convert
Markdown ⇄ HTML
Convert Markdown to clean HTML (GitHub-flavoured: tables, task lists, fenced code) or HTML back to Markdown. marked for md→html, Turndown for html→md. Scripts/styles are dropped on html→md. Price: free. Errors: returns isError with a message for invalid input or an upstream failure (not charged).
Read only
Open world
Idempotent
Input schema
{'type': 'object', 'required': ['input'], 'properties': {'to': {'enum': ['html', 'markdown'], 'type': 'string', 'default': 'html', 'description': 'Target format. One of "html", "markdown". Default "html".'}, 'input': {'type': 'string', 'x-raw': True, 'description': 'Markdown or HTML to convert.'}}, 'additionalProperties': False}
Output schema
{'type': 'object', 'properties': {'to': {'type': ['string', 'null']}, 'output': {'type': ['string', 'null']}}}
qr_code
QR code generator
Make a QR code for any text, URL, Solana Pay / wallet address or Wi-Fi login — as a PNG (base64 data URL) or SVG, with size, margin, colours and error correction. Rendered on our server. For Wi-Fi pass wifi_ssid + wifi_password; for Solana Pay pass a solana: URI as text. Price: free. Errors: returns isError with a message for invalid input or an upstream failure (not charged).
Read only
Open world
Idempotent
Input schema
{'type': 'object', 'properties': {'dark': {'type': 'string', 'default': '#000000', 'pattern': '^#[0-9a-fA-F]{6}$', 'description': 'Foreground colour as #rrggbb. Default "#000000".'}, 'size': {'type': 'integer', 'default': 512, 'maximum': 2048, 'minimum': 64, 'description': 'Image width/height in pixels. Range 64-2048. Default 512.'}, 'text': {'type': 'string', 'x-raw': True, 'description': 'Text or URL to encode (ignored when wifi_ssid is set).'}, 'light': {'type': 'string', 'default': '#ffffff', 'pattern': '^#[0-9a-fA-F]{6}$', 'description': 'Background colour as #rrggbb. Default "#ffffff".'}, 'format': {'enum': ['png', 'svg'], 'type': 'string', 'default': 'png', 'description': 'PNG (base64 data URL) or SVG markup. One of "png", "svg". Default "png".'}, 'margin': {'type': 'integer', 'default': 2, 'maximum': 16, 'minimum': 0, 'description': 'Quiet-zone width in modules. Range 0-16. Default 2.'}, 'wifi_ssid': {'type': 'string', 'description': 'Wi-Fi network name; makes a join-network QR instead of text.'}, 'wifi_password': {'type': 'string', 'description': 'Wi-Fi password (with wifi_ssid; omit for open networks).'}, 'error_correction': {'enum': ['L', 'M', 'Q', 'H'], 'type': 'string', 'default': 'M', 'description': 'Error-correction level: L 7%, M 15%, Q 25%, H 30%. One of "L", "M", "Q", "H". Default "M".'}}, 'additionalProperties': False}
Output schema
{'type': 'object', 'properties': {'svg': {'type': ['string', 'null']}, 'format': {'type': ['string', 'null']}, 'encoded': {'type': ['string', 'null']}}}
random_gen
Secure random + IDs
Cryptographically secure randomness: UUID v4/v7, passwords, API-key-style tokens, integers in a range, dice, coin flips, or a fair shuffle / pick from a list. Node's CSPRNG. Output is generated fresh per call and never stored or logged. Price: free. Errors: returns isError with a message for invalid input or an upstream failure (not charged).
Read only
Open world
Idempotent
Input schema
{'type': 'object', 'properties': {'max': {'type': 'integer', 'default': 100, 'description': 'Highest integer (kind=int). Default 100.'}, 'min': {'type': 'integer', 'default': 1, 'description': 'Lowest integer (kind=int or dice sides). Default 1.'}, 'kind': {'enum': ['uuid4', 'uuid7', 'password', 'token', 'int', 'shuffle', 'pick', 'coin', 'dice'], 'type': 'string', 'default': 'uuid4', 'description': 'What to generate. One of "uuid4", "uuid7", "password", "token", "int", "shuffle", "pick", "coin", "dice". Default "uuid4".'}, 'count': {'type': 'integer', 'default': 1, 'maximum': 100, 'minimum': 1, 'description': 'How many values to generate. Range 1-100. Default 1.'}, 'items': {'type': 'array', 'items': {'type': 'string'}, 'maxItems': 1000, 'description': 'List to shuffle or pick from (kind=shuffle or pick). 0-1000 items.'}, 'length': {'type': 'integer', 'default': 20, 'maximum': 256, 'minimum': 4, 'description': 'Length for passwords and tokens. Range 4-256. Default 20.'}, 'symbols': {'type': 'boolean', 'default': True, 'description': 'Include symbols in passwords. Default true.'}}, 'additionalProperties': False}
Output schema
{'type': 'object', 'properties': {'kind': {'type': ['string', 'null']}, 'result': {'type': 'array', 'items': {'type': ['string', 'null']}}}}
text_diff
Text diff
Diff two texts: unified diff (patch format), a line/word-level change list, and similarity % — compare versions of a doc, config or code. jsdiff. mode=lines gives a unified patch; mode=words gives word-level changes for prose. Price: free. Errors: returns isError with a message for invalid input or an upstream failure (not charged).
Read only
Open world
Idempotent
Input schema
{'type': 'object', 'required': ['a', 'b'], 'properties': {'a': {'type': 'string', 'x-raw': True, 'description': 'Original text.'}, 'b': {'type': 'string', 'x-raw': True, 'description': 'Changed text.'}, 'mode': {'enum': ['lines', 'words'], 'type': 'string', 'default': 'lines', 'description': 'Diff granularity. One of "lines", "words". Default "lines".'}, 'context': {'type': 'integer', 'default': 3, 'maximum': 20, 'minimum': 0, 'description': 'Unchanged lines of context around each change in the patch. Range 0-20. Default 3.'}}, 'additionalProperties': False}
Output schema
{'type': 'object', 'properties': {'changes': {'type': 'array', 'items': {'type': ['object', 'null'], 'properties': {'op': {'type': ['string', 'null']}, 'text': {'type': ['string', 'null']}}}}, 'unified': {'type': ['string', 'null']}, 'identical': {'type': ['boolean', 'null']}, 'chars_added': {'type': ['number', 'null']}, 'chars_removed': {'type': ['number', 'null']}, 'similarity_pct': {'type': ['number', 'null']}}}
text_stats
Text stats + token estimate
Count characters, words, sentences, lines and paragraphs, estimate LLM tokens, reading time and readability (Flesch), and pull out every URL, email, @handle, #tag, number and crypto address. Token count is an estimate (~4 characters per token for English; code and non-Latin scripts differ). Extraction uses strict patterns; EVM addresses are checksum-validated. Price: free. Errors: returns isError with a message for invalid input or an upstream failure (not charged).
Read only
Open world
Idempotent
Input schema
{'type': 'object', 'required': ['text'], 'properties': {'text': {'type': 'string', 'x-raw': True, 'description': 'Text (or a URL when extract=true) to analyse.'}, 'extract': {'type': 'boolean', 'default': True, 'description': 'true = if text is a URL, fetch the page and analyse its readable text. Default true.'}}, 'additionalProperties': False}
Output schema
{'type': 'object', 'properties': {'lines': {'type': ['number', 'null']}, 'words': {'type': ['number', 'null']}, 'extracted': {'type': ['object', 'null'], 'properties': {'urls': {'type': 'array', 'items': {'type': ['string', 'null']}}, 'emails': {'type': 'array', 'items': {'type': ['string', 'null']}}, 'handles': {'type': 'array', 'items': {'type': ['string', 'null']}}, 'numbers': {'type': 'array'}, 'hashtags': {'type': 'array', 'items': {'type': ['string', 'null']}}, 'evm_addresses': {'type': 'array'}, 'solana_addresses': {'type': 'array'}}}, 'sentences': {'type': ['number', 'null']}, 'characters': {'type': ['number', 'null']}, 'paragraphs': {'type': ['number', 'null']}, 'readability': {'type': ['string', 'null']}, 'reading_minutes': {'type': ['number', 'null']}, 'estimated_tokens': {'type': ['number', 'null']}, 'flesch_reading_ease': {'type': ['number', 'null']}, 'characters_no_spaces': {'type': ['number', 'null']}}}
unit_convert
Unit converter
Convert between units of length, mass, volume, temperature, speed, area, time, data size, energy, power, pressure, frequency and more — or list every unit a value converts to. Exact conversion tables (convert-units). Use abbreviations: m, km, mi, ft, kg, lb, oz, l, gal, C, F, K, km/h, mph, knot, B, KB, MB, GB (binary, 1 GB = 1024 MB), J, kWh, W, Pa, bar, psi, Hz… Price: free. Errors: returns isError with a message for invalid input or an upstream failure (not charged).
Read only
Open world
Idempotent
Input schema
{'type': 'object', 'required': ['value', 'from'], 'properties': {'to': {'type': 'string', 'description': 'omit to get every compatible unit'}, 'from': {'type': 'string', 'description': 'Source unit, e.g. "mi", "kg", "degF", "GB".'}, 'value': {'type': 'number', 'description': 'Number to convert.'}}, 'additionalProperties': False}
Output schema
{'type': 'object', 'properties': {'to': {'type': ['string', 'null']}, 'from': {'type': ['string', 'null']}, 'value': {'type': ['number', 'null']}, 'result': {'type': ['number', 'null']}}}
History
Recent tool changes
Added
text_stats
Sept. 29, 2026, 2:40 a.m.
Added
random_gen
Sept. 29, 2026, 2:40 a.m.
Added
jwt_decode
Sept. 29, 2026, 2:40 a.m.
Added
unit_convert
Sept. 29, 2026, 2:40 a.m.
Added
text_diff
Sept. 29, 2026, 2:40 a.m.
Added
markdown_convert
Sept. 29, 2026, 2:40 a.m.
Added
cron_explain
Sept. 29, 2026, 2:40 a.m.
Added
json_schema_validate
Sept. 29, 2026, 2:40 a.m.
Added
hash_encode
Sept. 29, 2026, 2:40 a.m.
Added
qr_code
Sept. 29, 2026, 2:40 a.m.
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