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Coremodels MCP Server

by qg-aramai Your server? Claim it
answering

Coremodels is answering right now. Last checked 1 min ago. It exposes 13 tools.

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

Uptime history 47 days of history · worst day 98%
47 days agonow
100.0%
Uptime 24h
92 of 92 checks
13
Tools
read from the server
928 ms
Response time
average over 24h
OAuth sign-in
Access
streamable-http

What changed 3

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 10 August 2026. No other catalogue keeps this.

12 Aug 2 tools appeared core_models_get_mixins_info, core_models_get_relation_groups_info
10 Aug a tool changed the parameters it asks for search_nodes

Nothing serious here today

Today is the operative word: we check Coremodels every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 1 min ago.

run in your terminal
claude mcp add coremodels --transport http https://go.coremodels.io/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "coremodels": {
      "url": "https://go.coremodels.io/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.coremodels]
url = "https://go.coremodels.io/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "coremodels": {
      "url": "https://go.coremodels.io/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "coremodels": {
      "url": "https://go.coremodels.io/mcp"
    }
  }
}

This endpoint answered with an authorization challenge. The server is running, and it signs you in through your browser: there is no API key to paste.

Available tools 13

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

export
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.
export_jsonschema
Export project data as a JSON Schema string.
export_shex
Export project data as a ShEx (Shape Expressions) schema string.
core
core_models_get_mixins_info
Get information about all mixins in a CoreModels project. Mixins define structured metadata used for mapping models, system integrations, and other extensions. Use get_node tool documentation to understand how mixins are attached to nodes.
core_models_get_relation_groups_info
Get information about relation groups for a CoreModels project. Use the relation groups to create a relation between two nodes.
json
fetch_json_ld_import_profiles
Fetch JSON-LD import/export profiles available for a project.
fetch_json_schema_import_profiles
Fetch JSON Schema import/export profiles available for a project.
code
run_code
Execute a JavaScript program that orchestrates this server's tools, and return only its result. Prefer this over many individual tool calls when a task needs several steps, looping, filtering, or combining data: intermediate results stay in the sandbox, so only what you return reaches the model. Inside the script: - listTools() -> [{name, summary}] discover available tools - getToolDoc(name) -> {name, description, parameters, required} inspect one tool's inputs - tools.<name>(args) -> parsed result call a tool (graphProjectId is injected automatically; do NOT pass it) - console.log(...) captured and returned alongside the result - return <value> JSON-serialized and returned Environment: sandboxed JavaScript, no network or filesystem, with limits on time, memory, statements and number of tool calls. Currently only read-only tools are callable from code.
mixins
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.
nodes
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.
project
get_project_summary
Labels and IDs of types, elements, and taxonomies in the project. Each category is paginated independently. Pagination: - First call: omit page (defaults to 0). - Each category reports page, pageSize and hasMore. Re-request with page+1 for any category whose hasMore is true.
projects
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. Set includeAISummary=true to also return each project's saved AI-generated summary and the time it was generated (4th and 5th elements). Paged: page is 1-based; increment page up to the returned totalPages to get all results.
validate
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.

Endpoints

URLTransportStateLatencyChecked
https://go.coremodels.io/mcp streamable-http sign-in 790 ms 1 min ago

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Coremodels — questions

Answers built from our own checks of this server.

What can Coremodels do?
It exposes 13 tools, read directly from the server on our last check. Among them: core_models_get_mixins_info, core_models_get_relation_groups_info, export_json_ld, export_jsonschema, export_shex, fetch_json_ld_import_profiles and 7 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
What is Coremodels mostly used for?
Its tools cluster around export, core and json. That is what this server is built to work with — the grouping comes from the actual tool names, not from a category we assigned.
Is Coremodels working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 928 ms. The bar chart above shows every period we have measured.
How do I connect Coremodels?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address. You sign in through your browser once and the client keeps the session: no key to copy, and it refuses anonymous clients.
How do you sign in to Coremodels?
No API key is involved. Coremodels answers our knock with an OAuth challenge, so you authorise it once in your browser and the client keeps the session. That is also why we see no tool list: it will not describe itself to an anonymous client, and that is the server working as intended, not a fault.
How fast is Coremodels?
It answers our handshake in 928 ms on average, which is faster than 10% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.