Live 66 Actions

Nmbrs MCP Server
for AI Agents

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

The StackOne Nmbrs 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 Nmbrs MCP server and give it 66 MCP tools out of the box. Auth, tool execution, and security all managed.

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Nmbrs MCP Server

Built by

StackOne

Coverage

66 Agent Actions

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

MCP Actions → Build Actions →

Authentication

Agent Tool Authentication

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

Agent Auth →

Security

Agent Protection

Every Nmbrs 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 Nmbrs call.

Tools Discovery →

What is the Nmbrs MCP Server?

A Nmbrs MCP server lets AI agents read and write Nmbrs data through the Model Context Protocol — Anthropic's open standard for connecting LLMs to external tools. StackOne's Nmbrs MCP server ships with 66 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 Nmbrs MCP Tools

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

Employee Bank Accounts

Create Employee Bank Account
Create employee bank account.
Update Employee Bank Account
Update employee bank account.

Contracts

Create Contract
Create employee contract.
Update Contract
Update employee contract.

Employees

Create Employee
Create employee.
List Employees
Get employee list.
Get Employee
Get an employee.

Employments

Create Employment
Create employment.
Update Employment
Update employment.

Employee Fixed Hours

Create Employee Fixed Hours
Create fixed hours.
List Employee Fixed Hours
Get fixed hours per employee.

Employee Variable Hours

Create Employee Variable Hours
Create variable hours.
List Employee Variable Hours
Get variable hours per employee.

Leave Requests

Create Leave Request
Create leave request.
Delete Leave Request
Delete employee leave request.

Employee Fixed Wage Components

Create Employee Fixed Wage Component
Create fixed wagecomponent.
List Employee Fixed Wage Components
Get fixed wage components.

Employee Variable Wage Components

Create Employee Variable Wage Component
Create variable wagecomponent.
List Employee Variable Wage Components
Get variable wagecomponents.

Other (47)

Create Employee Address
Create employee address.
Create Employee Salary
Create employee salary.
List Employee Addresses History
Get addresses history.
List Employee Bank Accounts History
Get bank accounts history.
List Companies
List all companies accessible to the authenticated Nmbrs user.
Get Company Current Period
Get company current period.
List Companies By Debtor
Get company list by debtor.
List Company Contact Persons
Get company contact persons.
List Accountant Contacts
Get accountant contact persons.
List Contracts History
Get contracts history.
List Company Cost Centers
Get company cost centers.
List Company Cost Units
Get company cost units.
List Countries
Get country codes.
List Debtors
Get debtor list.
Get Debtor Info
Get debtor info.
List Debtor Tags
Get debtor tags.
List Departments
Get departments.
Get Document Content
Get document content.
Get Employee Payslip
Get employee payslip per period.
List Employee Document Types
Get employee document types.
List Employees Personal Info History
Get employees history.
List Employments History
Get employments history.
List End Contract Reasons
Get end contract reasons.
List Functions
Get functions.
List Company Hour Codes
Get company hour codes.
List Absences History
Get employees absences history.
List Leave Balances
Get employees leave balances.
List Leave Requests History
Get leave requests history.
List Parental Leave History
Get employee parental leave history.
List Leave Groups
Get company leave groups.
List Managers
Get managers.
List Company Payroll Runs
Get company payroll runs.
List Payroll Run Employees
Get employees in payroll run.
List Salaries History
Get salaries history.
List Cost Per Hour
Get cost per hour.
List Company Salary Tables
Get company salary table history.
Get Salary Table Content
Get salary table content.
List Employees User Accounts
Get employees user accounts.
Get User Info
Get user info.
List Company Fixed Wage Components
Get company fixed wage components history.
List Company Variable Wage Components
Get company variable wage components history.
Update Employee Cost Center
Update employee cost center.
Update Employee Department
Update employee department.
Update Employee Personal Info
Update employee personal info.
Update Employee Social Security Number
Update employee social security number.
Update Employee Function
Update employee function.
Update Employee Manager
Update employee manager.

Nmbrs AI Agent Use Cases

Connect your AI agent to Nmbrs and help your team scale the HR operations they run by hand today.

Employee Onboarding

Use StackOne to connect your AI agent to your HRIS, identity management, and LMS to automate employee onboarding.

View

HR Policy Q&A Chatbot

Use StackOne to connect your AI agent to your HRIS, knowledge base, and messaging tools to automate HR policy Q&A.

View

Employee Offboarding

Use StackOne to connect your AI agent to your HRIS, identity management, and ITSM to automate employee offboarding and deprovisioning.

View

More HRIS & HCM use cases

Set Up Your Nmbrs MCP Server in Minutes

One endpoint. Any framework. Your agent is talking to Nmbrs 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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All HRIS / HCM MCP Servers →

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

Nmbrs MCP Server FAQ

Does StackOne have a Nmbrs MCP server?

Yes. StackOne offers a hosted Nmbrs MCP server with 66 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.

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

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

How does Nmbrs authentication work for AI agents?

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

Are Nmbrs MCP tools vulnerable to prompt injection?

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

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

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

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

When should I NOT use a Nmbrs MCP server?

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

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

The StackOne Nmbrs 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.

Start Free Book Demo

Nmbrs MCP Serverfor AI Agents

66 Agent Actions

Agent Tool Authentication

Agent Protection

Max Agent Context. Min Cost.

What is the Nmbrs MCP Server?

All Nmbrs MCP Tools

Employee Bank Accounts

Contracts

Employees

Employments

Employee Fixed Hours

Employee Variable Hours

Leave Requests

Employee Fixed Wage Components

Employee Variable Wage Components

Other (47)

Nmbrs AI Agent Use Cases

Set Up Your Nmbrs MCP Server in Minutes

Check More HRIS / HCM MCP Servers

Platform Resources

MCP Code Mode: Keeping Tool Responses Out of Agent Context

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

Indirect Prompt Injection Defense for MCP Tools: A Technical Guide

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

MCP vs API: What 200+ Connector Builds Taught Us

Nmbrs MCP Server FAQ

Put your AI agents to work

Nmbrs MCP Server
for AI Agents