Cornerstone MCP Server
for AI Agents
Connect your AI agent to StackOne's Cornerstone MCP server and give it 21 MCP tools out of the box. Auth, tool execution, and security all managed.
StackOne 
Coverage
21 Agent Actions
Create, read, update, and delete across Cornerstone — and extend your agent's capabilities with custom actions.
Authentication
Agent Tool Authentication
Per-user OAuth in one call. Your Cornerstone MCP server gets session-scoped tokens with zero credentials stored on your infra.
Agent Auth →
Security
Agent Protection
Every Cornerstone 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 Cornerstone call.
Tools Discovery →What is the Cornerstone MCP Server?
A Cornerstone MCP server lets AI agents read and write Cornerstone data through the Model Context Protocol — Anthropic's open standard for connecting LLMs to external tools. StackOne's Cornerstone MCP server ships with 21 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 Cornerstone MCP Tools
Every action from Cornerstone's API, ready for your agent. Create, read, update, and delete — scoped to exactly what you need.
Learning Assignments
- Search Learning Assignments
Search for and retrieve details on assignments created via API or Learning Assignment Tool
- Get Learning Assignment
Retrieve details of a specific learning assignment by ID
Other (19)
- Create Express Class
Submit an Express Class for one or more attendees
- Create Learning Object
Create a new learning object in Cornerstone Learning
- Get Learning Object Details
Retrieve details of a learning object available to an active user
- Search Transcripts
Search and retrieve users transcript information from Cornerstone Learning
- Get Transcript Enhanced Details
Returns enhanced details for a transcript record
- Get Transcript Curricula Child Details
Returns child related details for a curricula transcript record
- Get Remaining Assignment Count
Get the count of remaining assignments by date
- List Users
Retrieve a list of users from the users_core object with OData query support
- Get Approvals
Retrieve pending approvals for a manager or approver
- Get Assigned Trainings
Retrieve all training assigned to a user with statuses and due dates
- Get Inbox Items
Retrieve transcript records for a user from their inbox
- Get Sessions
Retrieve upcoming sessions in a user's transcript
- Get Suggested Trainings
Retrieve a user's transcript and task data for suggested trainings
- Get Tasks
Retrieve all incomplete tasks assigned to a user
- Get Transcripts (Legacy)
Retrieve transcript records for a user (legacy endpoint)
- Update Transcript Progress
Change a registered transcript record to "In Progress" status
- Catalog Search
Search the training catalog based on specific criteria
- Assign Training
Assign training to a user transcript
- Complete Training
Mark a transcript record as completed
Set Up Your Cornerstone MCP Server in Minutes
One endpoint. Any framework. Your agent is talking to Cornerstone 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>"
]
}
}
}Check More Learning / LMS MCP Servers
122+ actions
111+ actions
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78+ actions
72+ actions
69+ actions
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
Cornerstone MCP Server FAQ
Does StackOne have a Cornerstone MCP server?
Cornerstone MCP server vs direct API integration — what's the difference?
How does Cornerstone authentication work for AI agents?
origin_owner_id.Are Cornerstone MCP tools vulnerable to prompt injection?
What is the context bloat of a Cornerstone agent and how do I avoid it?
Can I limit which actions my Cornerstone agent can access?
Can I create custom agent actions for my Cornerstone MCP server?
When should I NOT use a Cornerstone MCP server?
What AI frameworks and AI clients does the StackOne Cornerstone 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.