cog-mcp-experimental 0.1.2

Unofficial MCP server for Cognite Data Fusion data modeling

cog-mcp-experimental

MCP server for Cognite Data Fusion data modeling. Exposes data model schemas as resources and instance operations (list, search, query, aggregate, retrieve) as tools.

Quick start

uvx cog-mcp-experimental

Configuration

Configuration is via environment variables — either passed through your MCP client's config, or loaded from a .env file in the working directory.

Using a .env file

Create a .env file (and add it to .gitignore):

CDF_CLIENT_ID=your-client-id
CDF_TENANT_ID=your-tenant-id
CDF_CLUSTER=westeurope-1
CDF_PROJECT=your-project
CDF_CLIENT_SECRET=your-secret
CDF_DATA_MODELS=[{"space": "mySpace", "externalId": "MyModel", "version": "1"}]
CDF_INSTANCE_SPACES=["instanceSpace1"]

The .env file does not override existing environment variables — explicit env vars from your MCP client config or shell always take precedence.

Required environment variables

Variable	Description
CDF_CLIENT_ID	OAuth client ID
CDF_TENANT_ID	Azure AD tenant ID
CDF_CLUSTER	CDF cluster (e.g. westeurope-1)
CDF_PROJECT	CDF project name
CDF_CLIENT_SECRET	OAuth client secret
CDF_DATA_MODELS	JSON array of data models: [{"space": "s", "externalId": "m", "version": "1"}]
CDF_INSTANCE_SPACES	JSON array of space IDs for automatic instance filtering: ["space1"]

Optional

Variable	Description
CDF_TOKEN_URL	Override OAuth token URL (defaults to Azure AD)

Client setup

Claude Desktop

~/Library/Application Support/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "cog-mcp-experimental": {
      "command": "uvx",
      "args": ["cog-mcp-experimental"],
      "env": {
        "CDF_CLIENT_ID": "your-client-id",
        "CDF_TENANT_ID": "your-tenant-id",
        "CDF_CLUSTER": "westeurope-1",
        "CDF_PROJECT": "your-project",
        "CDF_CLIENT_SECRET": "your-secret",
        "CDF_DATA_MODELS": "[{\"space\": \"mySpace\", \"externalId\": \"MyModel\", \"version\": \"1\"}]",
        "CDF_INSTANCE_SPACES": "[\"instanceSpace1\"]"
      }
    }
  }
}

Cursor

.cursor/mcp.json or ~/.cursor/mcp.json:

{
  "mcpServers": {
    "cog-mcp-experimental": {
      "command": "uvx",
      "args": ["cog-mcp-experimental"],
      "env": {
        "CDF_CLIENT_ID": "your-client-id",
        "CDF_TENANT_ID": "your-tenant-id",
        "CDF_CLUSTER": "westeurope-1",
        "CDF_PROJECT": "your-project",
        "CDF_CLIENT_SECRET": "${env:CDF_CLIENT_SECRET}",
        "CDF_DATA_MODELS": "[{\"space\": \"mySpace\", \"externalId\": \"MyModel\", \"version\": \"1\"}]",
        "CDF_INSTANCE_SPACES": "[\"instanceSpace1\"]"
      }
    }
  }
}

Claude Code

claude mcp add --transport stdio \
  --env CDF_CLIENT_ID=your-client-id \
  --env CDF_TENANT_ID=your-tenant-id \
  --env CDF_CLUSTER=westeurope-1 \
  --env CDF_PROJECT=your-project \
  --env 'CDF_DATA_MODELS=[{"space":"mySpace","externalId":"MyModel","version":"1"}]' \
  --env 'CDF_INSTANCE_SPACES=["instanceSpace1"]' \
  cog-mcp-experimental -- uvx cog-mcp-experimental

CDF_CLIENT_SECRET is inherited from your shell environment.

Tools

Discovery

Tool	Description
list_views	List available views with their space, externalId, and version
get_view_schema	Get full property schema for a view (names, types, relations)
get_filter_docs	Reference documentation for filter syntax
get_query_docs	Reference documentation for graph query syntax

Instance operations

Tool	Description
list_instances	List/filter instances of a view with pagination
search_instances	Full-text search across instances
aggregate_instances	Count, sum, avg, min, max, histogram
query_instances	Graph query across related instances
retrieve_instances	Get specific instances by ID

All instance tools automatically apply space filters from CDF_INSTANCE_SPACES.

Resources

The same discovery information is also available as MCP resources for clients that support them:

URI	Description
cdf://views	List all available views
cdf://views/{space}/{externalId}/{version}	View schema with property details
cdf://docs/filters	Filter syntax reference
cdf://docs/querying	Query syntax reference

Development

git clone <repo>
cd cog-mcp
uv sync
uv run cog-mcp-experimental

Test with MCP Inspector:

npx @modelcontextprotocol/inspector