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Nmbrs MCP Server
for AI Agents

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
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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
WorkdayBambooHRPersonioHiBobGustoRipplingOkta360Learning
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
WorkdayBambooHRPersonioHiBobGustoRipplingSharePointConfluence
Employee Offboarding

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

View
WorkdayBambooHRPersonioOktaServiceNowRipplingGustoJira
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

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

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.

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