Live 34 Actions

LastPass MCP Server
for AI Agents

Q: What AI frameworks and AI clients does the StackOne LastPass MCP server support?

The StackOne LastPass 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.

Connect your AI agent to StackOne's LastPass MCP server and give it 34 MCP tools out of the box. Auth, tool execution, and security all managed.

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LastPass MCP Server

Built by

StackOne

Coverage

34 Agent Actions

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

MCP Actions → Build Actions →

Authentication

Agent Tool Authentication

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

Agent Auth →

Security

Agent Protection

Every LastPass 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 LastPass call.

Tools Discovery →

What is the LastPass MCP Server?

A LastPass MCP server lets AI agents read and write LastPass data through the Model Context Protocol — Anthropic's open standard for connecting LLMs to external tools. StackOne's LastPass MCP server ships with 34 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 LastPass MCP Tools

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

Groups

List Groups
Retrieve all groups and their members from the LastPass Business account
Get Group
Retrieve a specific group and its members from the LastPass Business account

Unified Groups

List Unified Groups
List unified groups in LastPass.
Get Unified Group
Get a unified LastPass group by ID.

Unified Organizations

List Unified Organizations
List unified organizations in LastPass.
Get Unified Organization
Get a unified LastPass organization by ID.

Unified Roles

List Unified Roles
List unified roles in LastPass.
Get Unified Role
Get a unified LastPass role by ID.

Unified Users

List Unified Users
List unified users in LastPass.
Get Unified User
Get a unified LastPass user by ID.

Roles

List Roles
Retrieve shared folder data containing role permission sets from the LastPass Business account
Get Role
Retrieve shared folder data to look up a specific role by ID

Users

Batch Add Users
Bulk-create one or more LastPass Business users by POSTing an array of user objects to the Enterprise API batchadd command at /enterpriseapi.php, triggering activation emails for each newly provisioned account.
Update User
Update attributes for an existing user in the LastPass Business account
Delete User
Deactivate, remove, or permanently delete a user from the LastPass Business account via the deluser command, with the severity of the action controlled by the required deleteaction parameter (0 = deactivate, 1 = remove from enterprise, 2 = permanent delete).

Other (19)

Get Event Report
Retrieve audit event logs from the LastPass Business account
Get Unified Credentials
Get the current LastPass connection's unified credentials and identity.
List Unified Resource Users
List unified resource users in LastPass.
List Unified Resource Types
List unified resource types in LastPass.
List Policies
Retrieve shared folder data containing permission sets from the LastPass Business account
Get Policy
Retrieve shared folder data to look up a specific policy by ID
Get Shared Folder Data
Retrieve a list of all shared folders in the LastPass Business account
Get Detailed Shared Folder Data
Retrieve detailed information about all shared folders including sites and permissions
Get User Data
Retrieve detailed account data for users in the LastPass Business account via the getuserdata command, with optional filtering by username, admin status, or disabled status and pagination support for large directories.
Batch Change Group Membership
Add or remove users from groups in bulk
Update User Email
Update a user's primary email address in the LastPass Business account via the Enterprise API updateemail command, triggering a confirmation email to the new address.
Push Sites To Users
Distribute credential entries (sites) to users in the LastPass Business account
Bulk Delete Users
Delete multiple users from the LastPass Business account in a single call
Disable User
Deactivate a user account while preserving their vault data
Enable User
Re-enable a previously disabled user account
Reinvite User
Resend an invitation email to a user who has not yet accepted
Disable Multifactor Authentication
Disable multifactor authentication for a user
Reset Password
Send a master password reset email to a user
Require Master Password Change
Require a user to change their master password on next login via the LastPass Enterprise API requiremasterpasswordchange command.

Set Up Your LastPass MCP Server in Minutes

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

MCP Clients

Agent Frameworks

Claude Desktop-

JSON

Claude Desktop 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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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

LastPass MCP Server FAQ

Does StackOne have a LastPass MCP server?

Yes. StackOne offers a hosted LastPass MCP server with 34 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.

LastPass MCP server vs direct API integration — what's the difference?

A LastPass MCP server and direct API integration serve different use cases. Direct API integration is for software-to-software — backend code calling LastPass. A LastPass 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 LastPass at runtime. StackOne provides both.

How does LastPass authentication work for AI agents?

LastPass 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 LastPass account; StackOne handles token exchange, storage, and refresh. Credentials never reach the LLM, and each user is isolated via origin_owner_id.

Are LastPass MCP tools vulnerable to prompt injection?

Yes — LastPass 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 LastPass agent and how do I avoid it?

Context bloat happens when LastPass tool schemas and API responses eat your LastPass agent's memory, preventing it from reasoning effectively. A single LastPass 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 LastPass agent can access?

Yes — you can limit which actions your LastPass 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 LastPass MCP server?

Yes — you can create custom agent actions for your LastPass MCP server using Connector Builder. It's an integration agent your coding assistant (Claude Code, Cursor, or Copilot) can invoke to research LastPass's API, generate production-ready connector YAML, test against the live API, and validate before you ship.

When should I NOT use a LastPass MCP server?

Skip a LastPass MCP server if your integration is purely software-to-software — direct LastPass 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 LastPass actions at runtime.

What AI frameworks and AI clients does the StackOne LastPass MCP server support?

The StackOne LastPass 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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LastPass MCP Serverfor AI Agents