Set custom User-Agent for TFE API requests (#268)

This change sets a custom User-Agent header ("terraform-mcp-server/{version}")
for all Terraform Cloud/Enterprise API requests made by the MCP server.

Previously, the MCP server used the default go-tfe User-Agent ("go-tfe"),
making it impossible to distinguish MCP server requests from other go-tfe
client requests in HCP Terraform logs and metrics.

With this change:
- TFE API requests will use: "terraform-mcp-server/{version}"
- This matches the pattern already used for Registry API requests
- HCP Terraform can now identify and track MCP server usage separately

Co-authored-by: Claude Sonnet 4.5 <[email protected]>

Author: chrisarcand

CHANGELOG.md

@@ -1,3 +1,9 @@
+## UNRELEASED
+
+IMPROVEMENTS
+
+* Set custom User-Agent header for TFE API requests to enable tracking MCP server usage separately from other go-tfe clients [268](https://github.com/hashicorp/terraform-mcp-server/pull/268)
+
 ## 0.4.0
 
 FEATURES

pkg/client/tfe_client.go

@@ -6,10 +6,12 @@ package client
 import (
 	"context"
 	"fmt"
+	"net/http"
 	"sync"
 
 	"github.com/hashicorp/go-tfe"
 	"github.com/hashicorp/terraform-mcp-server/pkg/utils"
+	"github.com/hashicorp/terraform-mcp-server/version"
 	"github.com/mark3labs/mcp-go/server"
 	log "github.com/sirupsen/logrus"
 )
@@ -34,8 +36,10 @@ func NewTfeClient(sessionId string, terraformAddress string, terraformSkipTLSVer
 		Address:           terraformAddress,
 		Token:             terraformToken,
 		RetryServerErrors: true,
+		Headers:           make(http.Header),
 	}
 
+	config.Headers.Set("User-Agent", fmt.Sprintf("terraform-mcp-server/%s", version.GetHumanVersion()))
 	config.HTTPClient = createHTTPClient(terraformSkipTLSVerify, logger)
 
 	client, err := tfe.NewClient(config)