Server definition

Hash: sha256:19447613471b209915ac1c0ca2fd94c2821cc81fe647345bc2bfba0048ef167e
What it is: What a remote MCP server returned when asked what it offers: 1 tools

The blob, as servednamed by its sha256

{
  "instructions": null,
  "tools": [
    {
      "description": "Explain a regular expression in plain English and detect the failure modes that make patterns dangerous rather than merely wrong.\n\nUse this whenever a regex needs to be read, reviewed, or verified — and ALWAYS before putting a pattern somewhere it will run against untrusted input. The critical check is catastrophic backtracking: a pattern like (a+)+$ is three characters longer than a safe equivalent, looks harmless, and takes minutes of CPU on a 30-character input that almost matches. That makes it a denial-of-service vector. Whether a pattern is vulnerable depends on whether nested quantifiers can match the same characters in more than one way, which is a structural property that is unreliable to judge by reading.\n\nIt also flags: missing anchors (an unanchored validator accepts any string that merely CONTAINS a valid value), unescaped dots, character ranges like [A-z] that span punctuation, alternation precedence mistakes where an anchor applies to only one branch, and constructs JavaScript does not support.\n\nInput: `pattern` accepts either a bare pattern or a full /pattern/flags literal. JavaScript syntax; PCRE-only constructs are reported as unsupported rather than guessed at.\n\nReturns: `summary` (one sentence), `steps` (an ordered walkthrough), `warnings` (each with a code, severity, detail, and fix), `flagNotes`, capture group counts and names, and `hasBlockingIssue` — check that flag first. If the pattern cannot be parsed it returns an error naming the position, rather than a plausible-looking explanation of something else.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "pattern": {
            "description": "A JavaScript regular expression, either bare (\"^\\d+$\") or as a full literal (\"/^\\d+$/gi\"). Up to 2000 characters.",
            "type": "string"
          }
        },
        "required": [
          "pattern"
        ],
        "type": "object"
      },
      "name": "explain_regex",
      "outputSchema": null
    }
  ]
}

Verify it yourself

curl -s https://api.teppi.xyz/v1/evidence/sha256:19447613471b209915ac1c0ca2fd94c2821cc81fe647345bc2bfba0048ef167e | sha256sum