Connect
Optimize
Secure
Gusto MCP Server
for AI Agents
Production-ready Gusto MCP server with 72 extensible actions — plus built-in authentication, security, and optimized execution.
Gusto MCP Server
Built by 
StackOne
StackOne 
Coverage
72 Agent Actions
Create, read, update, and delete across Gusto — and extend your agent's capabilities with custom actions.
Authentication
Agent Tool Authentication
Per-user OAuth in one call. Your Gusto MCP server gets session-scoped tokens with zero credentials stored on your infra.
Agent Auth →
Security
Agent Protection
Every Gusto 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 Gusto call.
Tools Discovery →What is the Gusto MCP Server?
A Gusto MCP server lets AI agents read and write Gusto data through the Model Context Protocol — Anthropic's open standard for connecting LLMs to external tools. StackOne's Gusto MCP server ships with 72 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, Cursor, and VS Code, or from agent frameworks like OpenAI Agents SDK, LangChain, and Vercel AI SDK.
All Gusto MCP Tools and Actions
Every action from Gusto's API, ready for your agent. Create, read, update, and delete — scoped to exactly what you need.
Employees
- Create Employee
Create a new employee
- List Employees
Get all employees for a company
- Get Employee
Get details of a specific employee
- Update Employee
Update an employee
Home Address
- Get Home Address
Get a specific home address
- Update Home Address
Update an employee's home address
- Delete Home Address
Delete an employee's home address
Work Address
- Get Work Address
Get a specific work address
- Update Work Address
Update an employee's work address
- Delete Work Address
Delete an employee's work address
Contractors
- Create Contractor
Create a new contractor for the company
- List Contractors
Get all contractors for a company
- Get Contractor
Get details of a specific contractor
- Update Contractor
Update a contractor's information
- Delete Contractor
Delete a contractor
Payrolls
- Get Payroll
Get details of a specific payroll
- Delete Payroll
Delete an unprocessed payroll
Company Locations
- Create Company Location
Create a new company location
- List Company Locations
Get all locations for a company
Locations
- Get Location
Get details of a specific location
- Update Location
Update an existing location
Departments
- Create Department
Create a new department for the company
- List Departments
Get all departments for a company
- Get Department
Get details of a specific department
- Update Department
Update an existing department
- Delete Department
Delete a department
Jobs
- Create Job
Create a new job for an employee
- Get Job
Get details of a specific job
- Update Job
Update an existing job
- Delete Job
Delete a job
Compensations
- Create Compensation
Create a new compensation for a job
- Get Compensation
Get details of a specific compensation
- Update Compensation
Update an existing compensation
- Delete Compensation
Delete a compensation
Company Benefits
- List Company Benefits
Get all benefits for a company
- Get Company Benefit
Get details of a specific company benefit
- Update Company Benefit
Update an existing company benefit
Employee Benefits
- Create Employee Benefit
Enroll an employee in a company benefit
- List Employee Benefits
Get all benefits for an employee
- Get Employee Benefit
Get details of a specific employee benefit enrollment
- Update Employee Benefit
Update an employee's benefit enrollment
- Delete Employee Benefit
Remove an employee from a benefit enrollment
Company Bank Accounts
- Create Company Bank Account
Create a new company bank account
- List Company Bank Accounts
Get all bank accounts for a company
- Delete Company Bank Account
Disable a company bank account
Pay Schedules
- Create Pay Schedule
Create a new pay schedule for the company
- List Pay Schedules
Get all pay schedules for a company
- Get Pay Schedule
Get details of a specific pay schedule
- Update Pay Schedule
Update an existing pay schedule
Time Off Policys
- Create Time Off Policy
Create a new time off policy for the company
- Get Time Off Policy
Get details of a specific time off policy
- Update Time Off Policy
Update an existing time off policy
Company Attachments
- Upload Company Attachment
Upload a file as a company attachment
- List Company Attachments
List all attachments for a company
- Get Company Attachment
Get a specific company attachment by UUID
Other (17)
- Create Employee Home Address
Create a home address for an employee
- Create Employee Work Address
Create a work address for an employee
- Create Off-Cycle Payroll
Create a new off-cycle payroll
- Add Employees To Time Off Policy
Add employees to a time off policy
- Get Company
Get details of a specific company
- List Employee Home Addresses
Get all home addresses for an employee
- List Employee Work Addresses
Get all work addresses for an employee
- Get Employee Custom Fields
Get custom field values for an employee
- Get Employee Employment History
Get employment history for an employee
- List Company Payrolls
Get all payrolls for a company
- List Employee Jobs
Get all jobs for an employee
- List Job Compensations
Get all compensations for a job
- List Time Off Policies
Get all time off policies for a company
- Get Company Attachment Download URL
Get a temporary download URL for a company attachment
- Update Employee Time Off Balances
Update time off balances for employees on a policy
- Terminate Employee
Terminate an employee
- Verify Company Bank Account
Verify a company bank account using micro-deposits
Set Up Your Gusto MCP Server in Minutes
One endpoint. Any framework. Your agent is talking to Gusto in under 10 lines of code.
MCP Clients
Agent Frameworks
JSON{
"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>"
]
}
}
}More HRIS / HCM MCP Servers
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140+ actions
Workday (Rest and Soap)
128+ actions
Factorial
127+ actions
HiBob
123+ actions
Oracle Fusion HCM
120+ actions
Humaans
117+ actions
BambooHR
100+ actions
Gusto 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
Gusto MCP Server FAQ
Gusto MCP server vs direct API integration — what's the difference?
A Gusto MCP server and direct API integration serve different use cases. Direct API integration is for software-to-software — backend code calling Gusto. A Gusto 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 Gusto at runtime. StackOne provides both.
How does Gusto authentication work for AI agents?
Gusto 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 Gusto account; StackOne handles token exchange, storage, and refresh. Credentials never reach the LLM, and each user is isolated via
origin_owner_id.Are Gusto MCP tools vulnerable to prompt injection?
Yes — Gusto 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 Gusto agent and how do I avoid it?
Context bloat happens when Gusto tool schemas and API responses eat your Gusto agent's memory, preventing it from reasoning effectively. A single Gusto 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 Gusto agent can access?
Yes — you can limit which actions your Gusto 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 Gusto MCP server?
Yes — you can create custom agent actions for your Gusto MCP server using Connector Builder. It's an integration agent your coding assistant (Claude Code, Cursor, or Copilot) can invoke to research Gusto's API, generate production-ready connector YAML, test against the live API, and validate before you ship.
When should I NOT use a Gusto MCP server?
Skip a Gusto MCP server if your integration is purely software-to-software — direct Gusto 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 Gusto actions at runtime.
What AI frameworks and AI clients does the StackOne Gusto MCP server support?
The StackOne Gusto 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.