"The number 555" matching MCP servers:

Polish phone number lookup: who called, spam and scam checks, UKE DNO registry, CERT phishing stats

MCP server that lets AI agents rent a real UK phone number and receive SMS/OTP verification codes directly in agentic workflows.

MCP server that lets agents order temporary phone numbers, receive SMS verification codes, and manage activations via nine simple tools.

Security-enforcing MCP proxy that sits between an AI agent and any number of downstream MCP servers, intercepting every tool call through a capability-token policy gateway that can allow, deny, or escalate to human approval before the call reaches any real tool. It also exposes built-in operator tools for approval workflows, audit trail queries, token management, voice/HUD output, and hierarchical

MCP server for AI agent identity — verify agents with Ed25519 signatures, check trust scores, sign and verify content, exchange encrypted messages. Built on the Agent Identity Protocol (AIP).

Enables AI assistants to perform password security auditing using John the Ripper on a remote Kali system via SSH, supporting cracking, hash management, and session control.

Living off the Land intelligence for AI agents. GTFOBins, LOLBAS, LOOBins, LOLDrivers, LOLRMM, WADComs, LOLC2 and more — unified into a single MCP server.

MCP server for integrating with SMS-Activate service, enabling phone number operations, email activations, and account management for receiving SMS verification codes and temporary email addresses.

MCP server for the Tenable Identity Exposure API, providing 131 tools for complete API coverage with multi-tenant support and granular security controls.

the-real-unifi-mcp License: MIT Node MCP SDK [![CI](https://github.com/mguttmann/the-real-unifi-mcp/actions

Enterprise-grade code intelligence server for AI assistants that analyzes codebases for due diligence, tech debt, security vulnerabilities, and code quality.

Connect AI agents to Wavix's communications platform to send SMS, make and manage voice calls, run 2FA flows, and access speech analytics, phone number management, and SIP infrastructure.

MCP server for Quackr, enabling virtual phone number management including balance checking, pricing, inventory, purchasing numbers, and reading SMS via Claude or any MCP-compatible client.

Provides phone intelligence for AI voice agents, enabling inbound caller identification, outbound risk assessment, line type detection, and do-not-contact checks via four read-only MCP tools.

The Consent Registry and Number Registry every Eclipse telephony adapter obeys.

Rate-limits MCP tool calls with Upstash Redis, allowing a configurable number of invocations per sliding window and sharing counters across server instances.

Exposes any number of upstream MCP servers (stdio subprocesses or Streamable HTTP endpoints) as one MCP server for LLM agents, with namespaced tool names so servers cannot shadow each other. Every tool call passes centralized OAuth 2.1 bearer validation, per-client tool RBAC, rate limits, JSON Schema argument checks, a hash-chained audit log, and tool-definition pinning that quarantines changed tools until an operator approves them.

Enables authorized web/API security analysis as a stateful, multi-stage workflow with persistent session state, human-controlled validation, candidate versus confirmed finding tracking, and stop conditions.

Enables users to interact with Sinch APIs to send messages and emails, manage conversation apps, channels, templates, and webhooks, and perform phone number verification through natural-language MCP tools.

Local stdio MCP server for Bitwarden (Public API + Secrets Manager). 50+ admin tools for members, groups, collections, policies, licensing, projects, and secrets. For Claude Desktop / Claude Code.

Runs each MCP server once and lets any number of AI agents connect over HTTP with their own keys, per-tool grants and audit logging, plus a shared task list, shared memory and agent-to-agent requests. Enables agents to work as a coordinated team without duplicating processes, credentials or work.

Enables users to check a site, e-mail, phone number, IBAN, or SIREN against public sources and receive sourced anti-scam signals in French. The same checks are available remotely over MCP and locally via stdio, sharing the HTTP API's key and quota.

Enables an Alexa+ assistant to name scam warning signs drawn from FTC and FBI alerts, verify a story by texting a family member's pre-saved number, and surface official report links and guidance. It exposes tools and MCP Apps views for checking a suspicious call, while never approving payments, contacting the caller, or collecting sensitive numbers.

A verifying MCP gateway that pins approved tool manifests and skill files to content addresses, blocking tampered descriptions before they reach model context.

Enables an agent to find a business by phone number, check availability, book and cancel appointments, and verify business-signed receipts against a sandbox registry and demo shops that run locally over stdio. Every registry record and receipt is signature-checked, and nothing real is booked because the shops live inside the server process.

Enables organizations to govern agent tool access by letting admins onboard remote MCP servers, set credential modes, and define function-level allow-lists, while developers compose permitted bundles. Exposes any number of MCPs and tools through a single unified MCP endpoint with just two functions—search and execute—keeping IDE context lean and every call auditable.

Enables AI agents to scan, redact, and govern sensitive data before sending it to external tools through DLP, secure chat, and shadow AI discovery tools.

A production-shaped starter for putting an MCP server in front of an existing app, with OAuth and enterprise SSO handled through Clerk, enabling AI assistants to act on your product on behalf of logged-in users.

A local gate that lets agents submit risky tool actions for policy evaluation and receive ALLOW, DENY, or REQUIRE_APPROVE decisions before executing irreversible side effects. It can also open human approval holds and record an activity trail without executing the side effect itself.

A local MCP daemon that turns an agentic coding client into a bug bounty operator, with 103 tools for offensive security testing including MITM proxy, traffic analysis, and OOB callbacks.