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Rexact MCP server

by Nicolasmar91·io.github.Nicolasmar91/rexact-mcp·v0.1.2
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Verify, explain and audit regexes (ReDoS, engine compatibility) offline.

B83/100grade B
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Safety scan
B83/100

full report

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If you have run it, two minutes of your experience saves the next person an afternoon.

Rexact tools (5, 1 write)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

  • check_compat

    Reports syntax and semantic differences when a pattern is ported from its source flavor to one or more target engines (PCRE, RE2, Python, Java, .NET, POSIX grep). Offline, no API key required.

  • check_redos

    Statically and dynamically analyzes a pattern for ReDoS risk \u2014 never executes it against user-supplied input. Offline, no API key required.

  • explain_regex

    Breaks a pattern down into an ordered list of tokens (anchors, groups, quantifiers...) with a plain-language explanation for each. Offline, no API key required.

  • generate_regex

    Asks an LLM to draft a pattern from a description and test cases, then deterministically verifies it (compile, corpus, ReDoS) before returning it \u2014 never returns unverified model output. Requires ANTHROPIC_API_KEY in the MCP server's own environment (your own key, your own cost).

  • verify_regexwrite action

    Runs a regular expression against a set of test cases in a sandboxed worker (never on the calling process) and returns a pass/fail report. Offline, no API key required.

Public scan report

scanner v0.1.10 · 2026-10-15 · same rubric, same numbers if you re-run it

no findings
  • Code scan5 source files scanned25/25
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitystatic API keys via environment variables6/15
  • Maintenancelast push 0 days ago15/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10
Overall 83/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Rexact compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
83/100
higher than 65% of 48,255 servers
Tools
5
the typical server has 7
Tools that change things
20%
typical: 0%. Fewer write tools means less an agent can break

What its tools let an agent do: 3 read · 1 create · 1 change

Install Rexact in Claude Code, Cursor or VS Code

Runs npx -y rexact-mcp on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add rexact-mcp -- npx -y rexact-mcp
Add to Cursor

What the publisher says

From the Rexact repository's README, as published. We do not edit it. Read it on GitHub

rexact-mcp

Serveur MCP de Rexact : votre assistant IA vérifie, explique et audite des regex (ReDoS, compatibilité entre moteurs) avec le moteur de Rexact, hors ligne.

{ "mcpServers": { "rexact": { "command": "npx", "args": ["-y", "rexact-mcp"] } } }

Documentation d'usage : apps/mcp/README.md · Page du projet : · Paquet npm :

Contenu du dépôt

Le site rexact.dev lui-même n'est pas dans ce dépôt.

Développement

pnpm install
pnpm build
pnpm test

Ce dépôt est généré depuis le dépôt de développement de Rexact : les contributions sont les bienvenues via les issues et les pull requests, qui seront reportées à la main dans la source.

Licence

MIT, voir LICENSE.

Nothing above is checked by us. What we check is on the safety report.

Rexact: common questions

Is Rexact MCP server safe?
Mostly: it is graded B (83/100). Read the Rexact safety report
How do I install Rexact?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Rexact need an API key?
Yes. The registry entry asks for ANTHROPIC_API_KEY.
Is Rexact maintained?
The last commit was 20 days ago (2026-10-15). The latest release is v0.1.2.
How does Rexact compare with other MCP servers?
safety score 83/100 (higher than 65% of 48,255 servers); tools 5 (the typical server has 7); tools that change things 20% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.