Add container volume support for image-based MCP servers (#17)

Author: jritsema

README.md

@@ -389,6 +389,15 @@ services:
       BRAVE_API_KEY: ${BRAVE_API_KEY}
     labels:
       mcp.profile: programming, research
+
+  # Container with volume mounts
+  filesystem:
+    image: mcp/filesystem
+    volumes:
+      - ${HOME}/projects:/workspace:ro
+      - /tmp:/tmp
+    labels:
+      mcp.profile: programming
 ```
 
 ## Development

cmd/list.go

@@ -242,6 +242,12 @@ func printServerRow(w *tabwriter.Writer, name string, service Service, envVars m
 					commandStr += fmt.Sprintf(" -e %s=%s", key, shellQuote(expandedValue))
 				}
 
+				// Add volume mounts as -v flags
+				for _, volume := range service.Volumes {
+					expandedVolume := expandEnvVars(volume, envVars)
+					commandStr += fmt.Sprintf(" -v %s", shellQuote(expandedVolume))
+				}
+
 				// Add the image name
 				commandStr += fmt.Sprintf(" %s", service.Image)
 			} else {
@@ -284,6 +290,11 @@ func printServerRow(w *tabwriter.Writer, name string, service Service, envVars m
 					commandStr += fmt.Sprintf(" -e %s", key)
 				}
 
+				// Add volume mounts to the command
+				for _, volume := range service.Volumes {
+					commandStr += fmt.Sprintf(" -v %s", volume)
+				}
+
 				// Add the image name
 				commandStr += fmt.Sprintf(" %s", service.Image)
 			} else {

cmd/set.go

@@ -218,6 +218,12 @@ func convertToMCPConfig(servers map[string]Service, envVars map[string]string) M
 				args = append(args, "-e", fmt.Sprintf("%s=%s", key, expandedValue))
 			}
 
+			// Add volume mounts with expanded values
+			for _, volume := range service.Volumes {
+				expandedVolume := expandEnvVars(volume, envVars)
+				args = append(args, "-v", expandedVolume)
+			}
+
 			// Expand image name if it contains env vars
 			expandedImage := expandEnvVars(service.Image, envVars)
 			args = append(args, expandedImage)

cmd/types.go

@@ -91,6 +91,7 @@ type Service struct {
 	Image       string            `yaml:"image"`
 	Environment map[string]string `yaml:"environment"`
 	Labels      map[string]string `yaml:"labels"`
+	Volumes     []string          `yaml:"volumes"`
 }
 
 // MCPConfig represents the MCP JSON configuration format
@@ -151,8 +152,8 @@ type ToolStatus struct {
 
 // ToolConfig represents a tool's configuration with metadata
 type ToolConfig struct {
-	Config  MCPConfig
-	Path    string
-	Exists  bool
-	Error   string
+	Config MCPConfig
+	Path   string
+	Exists bool
+	Error  string
 }

mcp-compose.yml

@@ -1,5 +1,4 @@
 services:
-
   # default mcp servers
 
   time:
@@ -8,7 +7,6 @@ services:
   fetch:
     command: uvx mcp-server-fetch
 
-
   # programming
 
   github:
@@ -30,7 +28,6 @@ services:
     labels:
       mcp.profile: programming, database
 
-
   # Container based MCP servers
 
   github-docker:
@@ -46,3 +43,12 @@ services:
       BRAVE_API_KEY: ${BRAVE_API_KEY}
     labels:
       mcp.profile: programming, research
+
+  # Example with volume mounts
+  filesystem:
+    image: mcp/filesystem
+    volumes:
+      - ${HOME}/projects:/workspace:ro
+      - /tmp:/tmp
+    labels:
+      mcp.profile: programming