Anthropic MCP Server
for AI Agents

Q: 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.

Production-ready Anthropic MCP server with 29 extensible actions — plus built-in authentication, security, and optimized execution.

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Anthropic MCP Server

Built by

StackOne

Coverage

29 Agent Actions

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

MCP Actions → Create 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, and optimized agent context. 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 and Actions

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

Current Credentials

Get Current Credentials
Return the authenticated identity and auth type for the current Anthropic connection. Calls GET /v1/organizations/me to confirm Admin API key access and derive the organization name as the credential identity. Maps to the StackOne IAM unified credentials schema. auth_type is always "api_key" for this connector.

IAM Groups (Workspaces)s

List IAM Groups (Workspaces)
List all Anthropic workspaces in the organization, modeled as IAM groups. Wraps GET /v1/organizations/workspaces. Each workspace is an isolated access scope with its own members and API keys. Group type is always "workspace". Requires Admin API key.

IAM Group (Workspace)s

Get IAM Group (Workspace)
Retrieve a single Anthropic workspace (modeled as an IAM group) by its workspace ID. Wraps GET /v1/organizations/workspaces/{workspace_id}. Supports expand=["users"] to fetch workspace members inline. Requires Admin API key.

IAM Organizations

List IAM Organizations
Return the single Anthropic organization associated with the connected Admin API key, modeled as an IAM organization. Anthropic is single-tenant — each Admin API key belongs to exactly one organization. Maps GET /v1/organizations/me to the StackOne IAM unified organization schema. Requires Admin API key.
Get IAM Organization
Retrieve the Anthropic organization associated with the connected Admin API key. Always returns the single organization tied to the connection regardless of the ID passed. Maps GET /v1/organizations/me to the StackOne IAM unified organization schema. Requires Admin API key.

IAM Roles

List IAM Roles
Return the five Anthropic organization roles as IAM role records (user, developer, billing, admin, claude_code_user). Synthesized list — Anthropic has no public roles API. Role keys match the raw role strings returned on org user records by unified_list_users. Requires Admin API key for auth probe.
Get IAM Role
Retrieve a single Anthropic organization role by its key (admin, developer, billing, claude_code_user, or user). Returns the synthesized IamRole record matching that key. Performs an admin API auth probe to surface 401 when credentials are invalid.

IAM Users

List IAM Users
List all users in the Anthropic organization, mapped to the StackOne IAM unified user schema. Wraps GET /v1/organizations/users. Requires an Admin API key. Returns user identity, role (user/developer/billing/admin/claude_code_user), email, and addition timestamp.
Get IAM User
Retrieve a single Anthropic organization user by their ID, mapped to the StackOne IAM unified user schema. Wraps GET /v1/organizations/users/{user_id}. Requires Admin API key.

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

Agent Frameworks

Claude Desktop-

JSON

Browse Claude Desktop MCP Docs

{
  "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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Anthropic MCP Server 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

Anthropic MCP Server FAQ

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.

Put your AI agents to work

All the tools you need to build and scale AI agent integrations, with best-in-class connectivity, execution, and security.

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Anthropic MCP Serverfor AI Agents