Coremodels MCP Server

Schema modeling in JSON, JSON-LD, and other formats with CoreModels platform.

Tools

Last Updated

Jun 14, 2026

What is the Coremodels MCP Server?

The Coremodels MCP server gives AI agents structured, permission-aware access to Coremodels through the Model Context Protocol. With 9 pre-built actions, agents can read, create, and update Coremodels data on behalf of authorized users.

Willow ships the Coremodels MCP server as part of an enterprise control plane. Every call runs behind SSO (Okta, Azure AD), enforces RBAC and least-privilege at runtime, writes to a full audit trail, and integrates with Splunk and Loki for SIEM visibility. Connect from Claude Desktop, Claude Code, Cursor, ChatGPT, VS Code, n8n, or any custom agent. Install once, distribute org-wide, and see exactly how Coremodels is being used by every AI agent in your stack.

Tools

export_json_ld

Export project data in JSON-LD format using a configured export profile. Use `fetch_json_ld_import_profiles` first to discover the configTypeId. At least one of exportTypes/exportElements/exportTaxonomies/exportDataTypes must be true. Tree-based mode (graphBased=false) requires exactly one nodeId; graph-based mode allows multiple or none.

fetch_json_ld_import_profiles

Fetch JSON-LD import/export profiles available for a project.

export_jsonschema

Export project data as a JSON Schema string.

fetch_json_schema_import_profiles

Fetch JSON Schema import/export profiles available for a project.

validate_json

Validate a JSON document against a project's stored JSON Schema. The schema is regenerated from the project using the supplied configTypeId (the export profile id) and rootNodeId. Provide the JSON to validate as a serialized string.

get_mixins_and_relation_groups

Get the project schema: all mixin definitions and all relation-group definitions. Use this once at the start of a session to discover the IDs needed by other tools (mixinId, columnId, relationGroupId). Returns compact positional arrays - see the "format" field for the layout.

get_project_summary

Labels and IDs of types, elements, and taxonomies in the project. A category is omitted when it has more than 1000 nodes - use search_nodes with the matching nodeType filter to enumerate it.

list_projects

List the user's CoreModels projects as [id,name,accessLevel] (see the response "format" field). Use a returned id as graphProjectId for other tools. Pass searchTerm to filter by name (case-insensitive substring). Set includePublicProjects=true to also include public projects. Paged: page is 1-based; increment page up to the returned totalPages to get all results.

search_nodes

Search nodes in a CoreModels project. Returns compact positional arrays; the response "format" field describes the layout. Filters (provide at least one; they combine with AND): - nodeIds: exact id lookup - nodeType: one of Element, Type, Taxonomy, Exemplar, Component, Space, Tag, Mixin - expression: partial substring match on the node label (plain text, no wildcards) - spaceIds: restrict to specific spaces Optional flags: includeRelations, includeMixins, sortAttr, sortDesc, pageSize. Pagination: - First call: omit pagingToken. - If the response has a pagingToken, more pages exist. Repeat the same call with that exact token to get the next page. - If the response has no pagingToken, this was the last page.

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Set Up Your Coremodels MCP Server in Minutes

Add the following configuration to your MCP client. Authentication is handled via OAuth. Compatible with Claude Desktop, Claude Code, Cursor, ChatGPT, VS Code, n8n, and any MCP-compatible agent.

Claude Desktop

claude_desktop_config.json

{
  "mcpServers": {
    "willow-coremodels": {
      "type": "http",
      "url": "https://<org>.mcp-s.com/mcp/mcp/coremodels"
    }
  }
}

Cursor

.cursor/mcp.json

{
  "mcpServers": {
    "willow-coremodels": {
      "type": "http",
      "url": "https://<org>.mcp-s.com/mcp/mcp/coremodels"
    }
  }
}

Claude Code

CLI

claude mcp add willow-coremodels --transport http https://<org>.mcp-s.com/mcp/mcp/coremodels

n8n

HTTP Request Node

{
  "url": "https://<org>.mcp-s.com/mcp/mcp/coremodels",
  "method": "POST"
}

Or click "Install with Willow" above to set up automatically with SSO and RBAC preconfigured.

Enterprise Governance for Coremodels

Willow adds the layer Coremodels and every other SaaS doesn't ship out of the box: every call runs behind SSO (Okta, Azure AD), enforces RBAC and least-privilege at runtime, writes to full audit logs, and detects shadow AI usage across your stack. One MCP gateway. Any agent. Every tool.

Coremodels MCP Server FAQ

What is the Coremodels MCP server?

The Coremodels MCP server is a Model Context Protocol implementation that lets AI agents like Claude, Cursor, and ChatGPT read and write Coremodels data through a standardized interface. Willow hosts and governs this server so enterprises can roll it out without a security review backlog.

How is Willow's Coremodels MCP server different from the official one?

The official Coremodels MCP server is scoped to a single user's account and does not include enterprise governance. Willow's version adds SSO, RBAC, audit logging, shadow AI detection, and centralized control over which actions agents can take across the entire org.

Which AI clients work with the Coremodels MCP server?

Claude Desktop, Claude Code, Cursor, ChatGPT, VS Code with MCP support, n8n, and any custom agent built with OpenAI Agents SDK, LangChain, Vercel AI SDK, or Anthropic SDK.

Is the Coremodels MCP server secure? How does Willow handle authentication?

Every call runs behind your existing SSO (Okta, Azure AD). Per-user OAuth scopes the agent to exactly what that user can do in Coremodels, nothing more. No credentials reach the LLM. Every action writes to an audit trail.

Can I limit which Coremodels actions agents can take?

Yes. Willow lets you scope agents to specific actions, specific projects, or specific environments. Toggle actions on or off in the dashboard, or enforce policy via infrastructure-as-code through GitHub.

How do I detect shadow Coremodels MCP servers in my org?

Willow's browser extension and discovery service surface unmanaged MCP servers, skills, and AI agents across the org. If a developer installed an unapproved Coremodels MCP locally, you'll see it.

What does the Coremodels MCP server cost?

Pricing depends on org size and deployment model (SaaS, dedicated cloud, self-host). See withwillow.ai/pricing or contact sales for a quote.

How do I install the Coremodels MCP server with Willow?

Install via the Willow Connect Panel in one click, or paste the JSON snippet above into your Claude Desktop, Cursor, or Claude Code config. SSO and RBAC inherit from your existing Willow setup.