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A.U.G.U.R Synapse · Utils

by agent.maddegen.art · remote · no sign-in to list tools · v2.2.1 · published by art.maddegen.agent

Exact local utils: QR, hashing/encoding, JSON Schema, cron, markdown, diff, units, JWT, random.

Final · 2Changes · 4
CompareRegistry entry

10 tools: 2 do something that can't be undone, 4 change things and 4 only read.

Scanned Oct 21, 2026

2 checks matched something in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http synapse-util https://augur-trade.com/hub/mcp/util

Findings

Matches of fixed checks, with the text they matched.

2 warn
  • Warnmarkdown_convert

    The server marks "markdown_convert" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".

    Matched text

    annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The name "markdown_convert" says "convert": a word for a change.

    What this check looks for
  • Warnunit_convert

    The server marks "unit_convert" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".

    Matched text

    annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The name "unit_convert" says "convert": a word for a change.

    What this check looks for

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

10 tools

Can't be undone 2Claude Code: ask
  • markdown_convertConvert Markdown to clean HTML (GitHub-flavoured: tables, task lists, fenced code) or HTML back to Markdown.1 finding

    Why it is in this group

    • The name "markdown_convert" says "convert": a word for a change.
    • The input addresses people (input.to): what it sends cannot be taken back.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

    Findings

    • Warn

      The server marks "markdown_convert" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".

      Matched text

      annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The name "markdown_convert" says "convert": a word for a change.

      What this check looks for
    Description, as the server wrote it
    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).

    Annotations the server declares

    • title: Markdown ⇄ HTML
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
  • unit_convertConvert 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.1 finding

    Why it is in this group

    • The name "unit_convert" says "convert": a word for a change.
    • The input addresses people (input.to): what it sends cannot be taken back.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

    Findings

    • Warn

      The server marks "unit_convert" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".

      Matched text

      annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The name "unit_convert" says "convert": a word for a change.

      What this check looks for
    Description, as the server wrote it
    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).

    Annotations the server declares

    • title: Unit converter
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
Changes things 4Claude Code: ask
  • hash_encodeHash 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.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    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).

    Annotations the server declares

    • title: Hash + encode/decode
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
  • jwt_decodeDecode 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.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    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).

    Annotations the server declares

    • title: JWT decoder
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
  • qr_codeMake 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.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    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).

    Annotations the server declares

    • title: QR code generator
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
  • random_genCryptographically 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.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    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).

    Annotations the server declares

    • title: Secure random + IDs
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
Only reads 4Claude Code: allow
  • cron_explainExplain 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.No findings

    Why it is in this group

    • The name "cron_explain" says "explain": a word for reading.
    Description, as the server wrote it
    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).

    Annotations the server declares

    • title: Cron expression explain + next runs
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
  • json_schema_validateValidate 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.No findings

    Why it is in this group

    • The name "json_schema_validate" says "validate": a word for reading.
    Description, as the server wrote it
    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).

    Annotations the server declares

    • title: JSON Schema validator
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
  • text_diffDiff two texts: unified diff (patch format), a line/word-level change list, and similarity % — compare versions of a doc, config or code.No findings

    Why it is in this group

    • The name "text_diff" says "diff": a word for reading.
    Description, as the server wrote it
    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).

    Annotations the server declares

    • title: Text diff
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
  • text_statsCount characters, words, sentences, lines and paragraphs, estimate LLM tokens, reading time and readability (Flesch), and pull out every URL, email, @handle, #tag, number and crypt…No findings

    Why it is in this group

    • The description's first verb is "count": a word for reading.
    Description, as the server wrote it
    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).

    Annotations the server declares

    • title: Text stats + token estimate
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 2.2.1. Values in angle brackets are yours to fill in.

claude mcp add --transport http synapse-util https://augur-trade.com/hub/mcp/util

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__synapse-util__json_schema_validate",
      "mcp__synapse-util__cron_explain",
      "mcp__synapse-util__text_diff",
      "mcp__synapse-util__text_stats"
    ],
    "ask": [
      "mcp__synapse-util__qr_code",
      "mcp__synapse-util__hash_encode",
      "mcp__synapse-util__markdown_convert",
      "mcp__synapse-util__unit_convert",
      "mcp__synapse-util__jwt_decode",
      "mcp__synapse-util__random_gen"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as synapse-util. Review it before you use it.