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15Five MCP Server
for AI Agents

Connect your AI agent to StackOne's 15Five MCP server and give it 61 MCP tools out of the box. Auth, tool execution, and security all managed.

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15Five MCP Server
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61 Agent Actions

Create, read, update, and delete across 15Five — and extend your agent's capabilities with custom actions.

MCP Actions → Build Actions →

Authentication

Agent Tool Authentication

Per-user OAuth in one call. Your 15Five MCP server gets session-scoped tokens with zero credentials stored on your infra.

Agent Auth →

Security

Agent Protection

Every 15Five 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 15Five call.

Tools Discovery →

What is the 15Five MCP Server?

A 15Five MCP server lets AI agents read and write 15Five data through the Model Context Protocol — Anthropic's open standard for connecting LLMs to external tools. StackOne's 15Five MCP server ships with 61 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 15Five MCP Tools

Every action from 15Five's API, ready for your agent. Create, read, update, and delete — scoped to exactly what you need.

Users

  • List Users

    List users.

  • Get User

    Get user details.

  • Update User

    Edit user.

Groups

  • Create Group

    Create groups.

  • List Groups

    List groups.

  • Get Group

    Get group details.

  • Update Group

    Update groups.

Group Types

  • Create Group Type

    Create group type.

  • List Group Types

    List group types.

  • Get Group Type

    Get group type details.

  • Update Group Type

    Full replacement update of a group type (use patch for most edits).

  • Delete Group Type

    Delete group type.

People Attributes

  • Create People Attribute

    Create people attribute.

  • List People Attributes

    List people attribute definitions (the schema/field list).

  • Get People Attribute

    Get a single people attribute schema (definition).

People Attribute Values

  • Create People Attribute Value

    Create people attribute value.

  • List People Attribute Values

    List user-stored values for people attributes.

  • Get People Attribute Value

    Get a single user-attribute value.

Objectives

  • Create Objective

    Create objectives.

  • List Objectives

    List objectives.

  • Get Objective

    Get objective details.

  • Update Objective

    Update objectives.

Objective Historys

  • List Objective History

    Get all objectives history.

  • Get Objective History

    Get single objective history.

Key Results

  • Create Key Result

    Create key results.

  • Update Key Result

    Bulk update key result metadata (description, target, weight, owner).

Prioritys

  • Create Priority

    Create priorities.

  • Update Priority

    Update priorities.

Check-Ins

  • List Check-Ins

    List employee check-ins (15Five weekly status reports).

  • Get Check-In

    Get check-in details.

  • Delete Check-In

    Delete check-in.

Answers

  • List Answers

    List answers.

  • Get Answer

    Get answer details.

Questions

  • List Questions

    List questions.

  • Get Question

    Get question details.

Pulses

  • List Pulses

    Retrieve pulse data.

  • Get Pulse

    Get a single pulse rating's full record.

High Fives

  • Create High Five

    Create a peer high-five recognition.

  • List High Fives

    List high fives.

  • Get High Five

    Get high five details.

1-on-1s

  • List 1-on-1s

    List 1-on-1 meetings.

  • Get 1-on-1

    Get a single 1-on-1 meeting record.

Review Cycles

  • List Review Cycles

    List review cycles.

  • Get Review Cycle

    Get a single review cycle's full record.

Company Vacations

  • Create Company Vacation

    Create vacation.

  • List Company Vacations

    List vacations.

  • Update Company Vacation

    Update vacation.

  • Delete Company Vacation

    Delete vacation.

Other (13)

  • Create Bulk User Import

    Import users in bulk via CSV (currently non-functional).

  • Create Bulk User Update

    Create or update users in bulk via JSON (preferred path).

  • Get Hello

    Check API connection.

  • Get Company Active Status

    Retrieve company active status.

  • List Priorities

    List priorities.

  • List Review Cycle Participants

    List participants for a given review cycle.

  • List Review Cycle Answers

    Retrieve cycle questions and answers.

  • List Review Cycle Performance Measurements

    Retrieve cycle's performance measurements.

  • List Review Cycle Reviews

    List submitted reviews (with answers) for a given review cycle.

  • List Feature Statuses

    Retrieve feature statuses.

  • List Security Audit Events

    List security audit events.

  • Update Key Result Value

    Record progress on a single key result (current_value only).

  • Patch Group Type

    Edit a group type — change name or membership (preferred write path).

15Five AI Agent Use Cases

Connect your AI agent to 15Five 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 15Five MCP Server in Minutes

One endpoint. Any framework. Your agent is talking to 15Five 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

15Five MCP Server FAQ

Does StackOne have a 15Five MCP server?
Yes. StackOne offers a hosted 15Five MCP server with 61 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.
15Five MCP server vs direct API integration — what's the difference?
A 15Five MCP server and direct API integration serve different use cases. Direct API integration is for software-to-software — backend code calling 15Five. A 15Five 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 15Five at runtime. StackOne provides both.
How does 15Five authentication work for AI agents?
15Five 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 15Five account; StackOne handles token exchange, storage, and refresh. Credentials never reach the LLM, and each user is isolated via origin_owner_id.
Are 15Five MCP tools vulnerable to prompt injection?
Yes — 15Five 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 15Five agent and how do I avoid it?
Context bloat happens when 15Five tool schemas and API responses eat your 15Five agent's memory, preventing it from reasoning effectively. A single 15Five 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 15Five agent can access?
Yes — you can limit which actions your 15Five 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 15Five MCP server?
Yes — you can create custom agent actions for your 15Five MCP server using Connector Builder. It's an integration agent your coding assistant (Claude Code, Cursor, or Copilot) can invoke to research 15Five's API, generate production-ready connector YAML, test against the live API, and validate before you ship.
When should I NOT use a 15Five MCP server?
Skip a 15Five MCP server if your integration is purely software-to-software — direct 15Five 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 15Five actions at runtime.
What AI frameworks and AI clients does the StackOne 15Five MCP server support?
The StackOne 15Five 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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