Moss MCP Server
for AI Agents
Connect your AI agent to StackOne's Moss MCP server and give it 30 MCP tools out of the box. Auth, tool execution, and security all managed.
StackOne 
Coverage
30 Agent Actions
Create, read, update, and delete across Moss — and extend your agent's capabilities with custom actions.
Authentication
Agent Tool Authentication
Per-user OAuth in one call. Your Moss MCP server gets session-scoped tokens with zero credentials stored on your infra.
Agent Auth →
Security
Agent Protection
Every Moss 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 Moss call.
Tools Discovery →What is the Moss MCP Server?
A Moss MCP server lets AI agents read and write Moss data through the Model Context Protocol — Anthropic's open standard for connecting LLMs to external tools. StackOne's Moss MCP server ships with 30 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 Moss MCP Tools
Every action from Moss's API, ready for your agent. Create, read, update, and delete — scoped to exactly what you need.
Expenses
- List Expenses
Returns a paginated list of expenses with optional filtering by type, status, export status, and date ranges
Expense Accounts
- List Expense Accounts
Returns a paginated list of expense accounts with optional filtering and sorting
- Get Expense Account
Returns expense account information for a specific expense account ID
Dimensions
- Create Dimension
Creates a new dimension in the accounting system
- List Dimensions
Returns all dimensions within the authenticated user's organization
- Get Dimension
Returns dimension information for a specific dimension ID
- Update Dimension
Updates an existing dimension in the accounting system
Dimension Items
- Create Dimension Item
Creates a new dimension item for the specified dimension
- List Dimension Items
Returns a paginated list of dimension items with optional filtering and sorting
- Get Dimension Item
Returns dimension item information for a specific dimension item ID
- Update Dimension Item
Updates an existing dimension item
Suppliers
- Create Supplier
Creates a new supplier in the authenticated user's organization
- List Suppliers
Returns a paginated list of suppliers with optional filtering and sorting
- Get Supplier
Returns supplier information for a specific supplier ID
- Update Supplier
Partially updates a supplier in the authenticated user's organization
Payment Terms
- List Payment Terms
Returns a paginated list of payment terms with optional filtering and sorting
- Get Payment Term
Returns payment term information for a specific payment term ID
Tax Rates
- List Tax Rates
Returns a paginated list of tax rates with optional filtering and sorting
- Get Tax Rate
Returns tax rate information for a specific tax rate ID
Users
- List Users
Returns a paginated list of users with optional filtering and sorting
- Get User
Returns user information for a specific user ID
Teams
- List Teams
Returns a paginated list of teams with optional filtering and sorting
- Get Team
Returns team information for a specific team ID
Departments
- List Departments
Returns a paginated list of departments with optional filtering and sorting
- Get Department
Returns department information for a specific department ID
Bank Accounts
- List Bank Accounts
Returns all bank accounts (wallets) for the authenticated user's organization
Bank Account Balances
- Get Bank Account Balance
Returns the current balance for a specific bank account
Bank Transactions
- Search Bank Transactions
Returns a paginated list of bank transactions for a specific bank account within a date range
Files
- Search Files
Returns a paginated list of files based on expense IDs
- Download File
Downloads file contents by its ID
Set Up Your Moss MCP Server in Minutes
One endpoint. Any framework. Your agent is talking to Moss in under 10 lines of code.
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>"
]
}
}
}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
Moss MCP Server FAQ
Does StackOne have a Moss MCP server?
Moss MCP server vs direct API integration — what's the difference?
How does Moss authentication work for AI agents?
origin_owner_id.Are Moss MCP tools vulnerable to prompt injection?
What is the context bloat of a Moss agent and how do I avoid it?
Can I limit which actions my Moss agent can access?
Can I create custom agent actions for my Moss MCP server?
When should I NOT use a Moss MCP server?
What AI frameworks and AI clients does the StackOne Moss MCP server support?
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.