ct-kubecost-mcp-server 0.1.0

CloudThinker stdio MCP server for KubeCost / OpenCost: reads KUBECOST_* env at startup, auto-connects to the cost API, and serves read-only Kubernetes cost allocation, assets, cloud cost, and efficiency (right-sizing) tools.

ct-kubecost-mcp-server

A CloudThinker stdio MCP server for KubeCost and OpenCost. It auto-connects from environment variables and serves read-only Kubernetes cost tools, so it drops into CloudThinker's env-injection connection model.

There is no pip-installable upstream MCP to wrap — OpenCost's MCP server is Go, compiled into its cost-model binary (pkg/mcp/server.go). This server authors the tools directly against the KubeCost/OpenCost HTTP cost API, mirroring OpenCost's four query types: allocation, asset, cloudcost, efficiency.

What it does

• Reads KUBECOST_* env vars at startup and connects to the cost API.
• Serves read-only tools over stdio.
• KubeCost serves the API under /model (/model/allocation); bare OpenCost serves it at the root (/allocation). Controlled by KUBECOST_API_PREFIX (default /model).

Run

uvx --from ct-kubecost-mcp-server@0.1.0 ct-kubecost-mcp-server

Environment

Var	Required	Default	Purpose
KUBECOST_URL	yes	—	base URL of the KubeCost/OpenCost endpoint
KUBECOST_AUTH_TYPE	no	none	none | bearer | basic
KUBECOST_TOKEN	when bearer	—	bearer token (Authorization: Bearer …)
KUBECOST_USERNAME	when basic	—	HTTP basic username
KUBECOST_PASSWORD	when basic	—	HTTP basic password
KUBECOST_API_PREFIX	no	/model	path prefix; set empty ("") for bare OpenCost
KUBECOST_INSECURE_SKIP_VERIFY	no	false	true → skip TLS verification
LOG_LEVEL	no	info	mapped to FASTMCP_LOG_LEVEL

Tools (read-only)

Tool	Purpose	API
get_allocation	in-cluster cost by namespace/controller/pod (chargeback)	GET {prefix}/allocation
get_assets	cloud asset cost (nodes, disks, network)	GET {prefix}/assets
get_cloud_cost	out-of-cluster cloud bill	GET {prefix}/cloudCost
get_efficiency	right-sizing — requested vs used, estimated wasted cost	derived from /allocation
health	reachability + auth probe	GET {prefix}/allocation?window=1h

Time windows accept KubeCost/OpenCost formats: today, week, month, Nd (e.g. 7d), Nh, or an RFC3339 / unix-timestamp range.

Build

python -m build        # or: hatch build

License

Apache-2.0.