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Terraform MCP Server

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by hashicorp
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Server Configuration

Describes the environment variables required to run the server.

NameRequiredDescriptionDefault
LOG_LEVELNoLogging level: trace, debug, info, warn, error, fatal, panic (overrides --log-level flag)info
TFE_TOKENNoTerraform Enterprise API token
LOG_FORMATNoLogging format: text or json (overrides --log-format flag)text
TFE_ADDRESSNoSets the Terraform Enterprise/HCP Terraform address for API calls. Must include the protocol (e.g., https://app.terraform.io). In streamable-http mode this is the only way to set the address; it cannot be supplied by clients via header or query parameter.
MCP_ENDPOINTNoHTTP server endpoint path/mcp
MCP_CORS_MODENoCORS mode: strict, development, or disabledstrict
MCP_KEEP_ALIVENoKeep-alive interval for SSE connections (e.g., 30s, 1m). 0 to disable0
TRANSPORT_HOSTNoHost to bind the HTTP server127.0.0.1
TRANSPORT_MODENoSet to streamable-http to enable HTTP transport (legacy http value still supported)stdio
TRANSPORT_PORTNoHTTP server port8080
INSTANA_ENABLEDNoEnable Instana instrumentation (metrics and HTTP request tracing) for the streamable-http server. Requires an Instana agent that is reachable by the server.false
MCP_SESSION_MODENoSession mode: stateful or statelessstateful
MCP_TLS_KEY_FILENoPath to TLS key file, required for non-localhost deployment (e.g. /path/to/key.pem)
MCP_TLS_CERT_FILENoPath to TLS cert file, required for non-localhost deployment (e.g. /path/to/cert.pem)
MCP_ALLOWED_ORIGINSNoComma-separated list of allowed origins for CORS
TFE_SKIP_TLS_VERIFYNoSkip HCP Terraform or Terraform Enterprise TLS verificationfalse
ENABLE_TF_OPERATIONSNoEnable tools that require explicit approvalfalse
INSTANA_SERVICE_NAMENoIf Instana instrumentation is enabled, the service name to use for the MCP serverterraform-mcp-server
MCP_REMOTE_IP_METHODNoHow the client IP is sourced when forwarding is enabled: RemoteAddr (direct connection only), X-Real-IP, or X-Forwarded-ForRemoteAddr
MCP_XFF_TRUSTED_HOPSNoNumber of trusted proxy hops counted from the right of the X-Forwarded-For chain. Only used when MCP_REMOTE_IP_METHOD=X-Forwarded-For0
OTEL_METRICS_ENABLEDNoEnable tools and server metrics using otelfalse
TF_MCP_SHARED_SECRETNoShared secret sent as the X-Tf-Mcp-Secret header on requests to HCP Terraform / TFE, used to identify requests originating from a hosted MCP deployment. Should only be used over TLS.
MCP_FORWARD_CLIENT_IPNoForward the client IP to HCP Terraform / TFE via X-Forwarded-For. Set to true to enablefalse
MCP_RATE_LIMIT_GLOBALNoGlobal rate limit (format: rps:burst)10:20
MCP_REDIRECT_ROOT_URLNoURL to redirect requests to / to
OTEL_METRICS_ENDPOINTNoURL of your OTel Collector or backendlocalhost:4318
MCP_RATE_LIMIT_SESSIONNoPer-session rate limit (format: rps:burst)5:10
OTEL_METRICS_SERVICE_NAMENoIdentifies the source of the metrics (e.g., "terraform-mcp-server")terraform-mcp-server
MCP_ORGANIZATION_ALLOWLISTNoCSV list of HCP Terraform organization names allowed to access the HTTP server
OTEL_METRICS_EXPORT_INTERVALNoControls the frequency of metric flushes2
OTEL_METRICS_SERVICE_VERSIONNoVersion of the terraform-mcp-server sending metrics, which is used to set metric attributes. It also helps track metrics across different deploymentslatest

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