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Closing the Loop: A Self-Evolving Defense
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Live 29 Actions

Anthropic MCP Server
for AI Agents

Connect your AI agent to StackOne's Anthropic MCP server and give it 29 MCP tools out of the box. Auth, tool execution, and security all managed.

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Anthropic MCP Server
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29 Agent Actions

Create, read, update, and delete across Anthropic — and extend your agent's capabilities with custom actions.

MCP Actions → Build Actions →

Authentication

Agent Tool Authentication

Per-user OAuth in one call. Your Anthropic MCP server gets session-scoped tokens with zero credentials stored on your infra.

Agent Auth →

Security

Agent Protection

Every Anthropic tool response scanned for prompt injection in milliseconds — 88.7% accuracy, all running on CPU.

Prompt Injection Defense →

Performance

Max Agent Context. Min Cost.

Free up to 96% of your agent's context window to enhance reasoning and reduce cost, on every Anthropic call.

Tools Discovery →

What is the Anthropic MCP Server?

A Anthropic MCP server lets AI agents read and write Anthropic data through the Model Context Protocol — Anthropic's open standard for connecting LLMs to external tools. StackOne's Anthropic MCP server ships with 29 pre-built actions, fully extensible via the Connector Builder — plus managed authentication, prompt injection defense, observability, and agent execution runtime. Connect it from MCP clients like Claude Desktop, Claude Code, Cursor, Goose, and VS Code, or from agent frameworks like OpenAI Agents SDK, LangChain, and Vercel AI SDK.

All Anthropic MCP Tools

Every action from Anthropic's API, ready for your agent. Create, read, update, and delete — scoped to exactly what you need.

API Keys

  • List API Keys

    List all API keys in the organization

  • Get API Key

    Retrieve details of a specific API key

  • Update API Key

    Update the name or status of an API key

Unified Credentials

  • Get Unified Credentials

    Get the current Anthropic connection's unified credentials and identity.

Unified Groups

  • List Unified Groups

    List unified groups in Anthropic.

  • Get Unified Group

    Get a unified Anthropic group by ID.

Unified Organizations

  • List Unified Organizations

    List unified organizations in Anthropic.

  • Get Unified Organization

    Get a unified Anthropic organization by ID.

Unified Roles

  • List Unified Roles

    List unified roles in Anthropic.

  • Get Unified Role

    Get a unified Anthropic role by ID.

Unified Users

  • List Unified Users

    List unified users in Anthropic.

  • Get Unified User

    Get a unified Anthropic user by ID.

Invites

  • Create Invite

    Invite a user to join the organization

  • List Invites

    List all pending invites for the organization

  • Get Invite

    Retrieve details of a specific organization invite

  • Delete Invite

    Delete a pending organization invite

Messages

  • Create Message

    Send a message to a Claude model and get a response

Count Tokens

  • Count Tokens

    Count tokens in a message without sending it

Models

  • List Models

    List available Claude models

  • Get Model

    Get details of a specific Claude model

Organizations

  • Get Organization

    Retrieve information about the current organization

Users

  • List Users

    List all users in the organization

  • Get User

    Retrieve details of a specific organization user

  • Update User

    Update the role of a user in the organization

Workspaces

  • Create Workspace

    Create a new workspace in the organization

  • List Workspaces

    List all workspaces in the organization

  • Get Workspace

    Retrieve details of a specific workspace

  • Update Workspace

    Update the name or data residency configuration of a workspace

Archive Workspaces

  • Archive Workspace

    Archive a workspace

Set Up Your Anthropic MCP Server in Minutes

One endpoint. Any framework. Your agent is talking to Anthropic in under 10 lines of code.

MCP Clients

Claude Desktop setup guide
Claude Code setup guide
Cursor setup guide
Goose setup guide

Agent Frameworks

Claude Desktop
{
  "mcpServers": {
    "stackone": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote@latest",
        "https://api.stackone.com/mcp?x-account-id=<account_id>",
        "--header",
        "Authorization: Basic <YOUR_BASE64_TOKEN>"
      ]
    }
  }
}

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Platform Resources

MCP Code Mode: Keeping Tool Responses Out of Agent Context

Anthropic's code_execution processes data already in context. Custom MCP code mode keeps raw tool responses in a sandbox. 14K tokens vs 500.

11 min

Comparing BM25, TF-IDF, and Hybrid Search for MCP Tool Discovery

Benchmarking BM25, TF-IDF, and hybrid search for MCP tool discovery across 916 tools. The 80/20 TF-IDF/BM25 hybrid hits 21% Top-1 accuracy in under 1ms.

10 min

Indirect Prompt Injection Defense for MCP Tools: A Technical Guide

MCP tools that read emails, CRM records, and tickets are indirect prompt injection vectors. Here's how we built a two-tier defense that scans tool results in ~11ms.

12 min

MCP vs A2A: Architecture, Security, and When to Use Each

MCP vs A2A: what each protocol standardizes, how they differ, their shared security risks including indirect prompt injection, and when to use one, both, or a hybrid architecture.

12 min

MCP vs API: What 200+ Connector Builds Taught Us

MCP wraps APIs, it doesn't replace them. After building 200+ connectors that serve both, here's when each approach wins.

14 min read

Anthropic MCP Server FAQ

Does StackOne have a Anthropic MCP server?
Yes. StackOne offers a hosted Anthropic MCP server with 29 pre-built actions, and every action is tested and QA'd by StackOne. Connect it to Claude, Cursor, and any other MCP client, or to any agent framework through the AI Action SDK. It ships with managed agent authentication, prompt injection defense, and tool discovery with server-side execution that preserve your agent's context window and keep reasoning performance.
Anthropic MCP server vs direct API integration — what's the difference?
A Anthropic MCP server and direct API integration serve different use cases. Direct API integration is for software-to-software — backend code calling Anthropic. A Anthropic MCP server is for AI agents — MCP clients like Claude and Cursor, plus framework agents built with OpenAI, LangChain, or Vercel AI — discovering and calling Anthropic at runtime. StackOne provides both.
How does Anthropic authentication work for AI agents?
Anthropic authentication for AI agents works through a StackOne Connect Session. Create one via the dashboard or the SDK — you get an auth link and ready-to-paste config for Claude Desktop, Cursor, and other MCP clients. Your user authenticates their own Anthropic account; StackOne handles token exchange, storage, and refresh. Credentials never reach the LLM, and each user is isolated via origin_owner_id.
Are Anthropic MCP tools vulnerable to prompt injection?
Yes — Anthropic MCP tools can be vulnerable to indirect prompt injection. Any tool that reads user-written content — documents, messages, tickets, records, or free-text fields — is a potential vector. StackOne Defender scans every tool response before it enters the agent's context — regex patterns in ~1ms, then a MiniLM classifier in ~4ms. 88.7% accuracy, CPU-only.
What is the context bloat of a Anthropic agent and how do I avoid it?
Context bloat happens when Anthropic tool schemas and API responses eat your Anthropic agent's memory, preventing it from reasoning effectively. A single Anthropic query can return a massive JSON response, and connecting multiple tools compounds the problem. Tools Discovery and Code Mode reduce context bloat — loading only relevant tools per query and keeping raw responses out of the agent's context.
Can I limit which actions my Anthropic agent can access?
Yes — you can limit which actions your Anthropic agent can access directly from the StackOne dashboard. Toggle actions on or off, or restrict them to specific accounts, with no code changes to your agent. Session tokens can be scoped to exact actions so if one leaks, exposure stays contained.
Can I create custom agent actions for my Anthropic MCP server?
Yes — you can create custom agent actions for your Anthropic MCP server using Connector Builder. It's an integration agent your coding assistant (Claude Code, Cursor, or Copilot) can invoke to research Anthropic's API, generate production-ready connector YAML, test against the live API, and validate before you ship.
When should I NOT use a Anthropic MCP server?
Skip a Anthropic MCP server if your integration is purely software-to-software — direct Anthropic API integration is simpler when no AI agent is involved. For deterministic, compliance-critical operations (financial transactions, regulatory reporting), direct API gives you predictable behavior without agent-driven decision-making. MCP shines when AI agents need to dynamically discover and call Anthropic actions at runtime.
What AI frameworks and AI clients does the StackOne Anthropic MCP server support?
The StackOne Anthropic MCP server supports both. MCP clients (paste-and-go apps): Claude Desktop, Claude Code, Cursor, VS Code, Goose. Agent frameworks (code SDKs you build with): OpenAI Agents SDK, Anthropic, Vercel AI, Google ADK, CrewAI, Pydantic AI, LangChain, LangGraph, Azure AI Foundry.

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