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97,619 servers. Updated
19 Best Email MCP Servers: compared and ranked, October 2026Ranked from 2,721 matching servers on stars, growth, downloads and maintenance. Updated .

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    Post-quantum readiness for AI coding agents: scans code for quantum-vulnerable cryptography (RSA/ECDH/ECDSA/DH) and returns NIST ML-KEM/ML-DSA/SLH-DSA (and hybrid) migration guidance, with fix verification and dependency checks. Content-based, advisory tools only; runs local (npx @quantakrypto/mcp) or as a hosted OAuth endpoint.
    16
    14
    Apache 2.0
  • A
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    quality
    B
    maintenance
    Enables AI agents to pay per call for live package-safety and GitHub merge-readiness trust signals via the x402 protocol.
    3
    MIT
  • A
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    Not graded
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    C
    maintenance
    Presents a plausible, tool-rich workspace surface — file reading, credential listing, command execution, database queries, and configuration retrieval — that returns only synthetic results while logging every connection, tool call, and argument received. It enables researchers to measure what MCP clients and agents actually do when handed dangerous-sounding tools, including whether they follow injected instructions or complete a retrieve-then-use credential chain.
    MIT
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    A
    maintenance
    Enables AI agents to perform common utility tasks through a streamable HTTP MCP endpoint, including JSON inspection, regex testing, cron parsing, hashing, base64 encoding/decoding, URL analysis, color conversion, text diffing, CSV parsing, JWT decode/verification, Markdown-to-HTML rendering, and UUID/token generation without API keys.
    MIT
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    quality
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    maintenance
    An MCP server that exposes 43 domain tools behind 4 meta-tools, applying guardrails such as budgets, rate limits, schema validation, human-in-the-loop confirmation for mutations, PII redaction, and an append-only audit log while reducing context window usage.
    4
    MIT
  • A
    license
    A
    quality
    D
    maintenance
    A comprehensive suite of HTTP and API testing tools that enables AI agents to perform requests, check endpoint health, and decode JWTs. It also provides utilities for URL parsing and detailed security analysis of HTTP response headers.
    5
    48 npm
    MIT
  • A
    license
    A
    quality
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    maintenance
    Enables cryptographic operations including hashing, encoding/decoding, ID generation, password tools, and JWT inspection via MCP.
    5
    36 npm
    MIT
  • F
    license
    A
    quality
    A
    maintenance
    An MCP server that sends plain-text Gmail messages only to a predefined allowlist, using generated recipient IDs instead of email addresses to enforce security.
    2
    1
    -
  • F
    license
    A
    quality
    B
    maintenance
    Enables querying MITRE ATT&CK and D3FEND data efficiently, providing techniques, detections, mitigations, actors, and countermeasures with token-aware summaries and paginated graph traversal.
    10
    -
  • A
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    quality
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    maintenance
    Defense-grade cryptographic compliance and analysis tools for MCP, including FIPS 140-3 validation, CNSA 2.0 analysis, post-quantum readiness assessment, and classical cipher utilities.
    18
    1
    MIT
  • A
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    C
    quality
    C
    maintenance
    Community MCP server for the Cymulate security validation platform. It exposes the full Cymulate REST API (337 endpoints) as 106 semantic tools for BAS, exposure validation, attack surface management, and platform administration.
    100
    MIT
  • F
    license
    C
    quality
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    maintenance
    Enables high-precision detection, anonymization, encryption and decryption of personally identifiable information (PII) in text using GPT-4o-based detection and advanced cryptographic methods. Supports both deterministic encryption for searchable data and format-preserving encryption for structured identifiers.
    8
    1
    -
  • A
    license
    Not graded
    quality
    C
    maintenance
    MCP server for regulated enterprises, providing per-tool RBAC, redacted audit logging, and structured error handling. Exposes bank tools for customer lookup, statement search, and dispute resolution over stdio and HTTPS transports.
    MIT
  • A
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    Not graded
    quality
    D
    maintenance
    A comprehensive MCP server that exposes multiple OSINT tools to AI assistants like Claude, enabling sophisticated reconnaissance and information gathering tasks using industry-standard OSINT tools.
    241
    MIT