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Add HTTP transport support to mock MCP server #59

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5f80d3d
Initial plan for issue
Copilot Jun 5, 2025
44058d3
Implement HTTP transport for mock MCP server
Copilot Jun 5, 2025
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21 changes: 17 additions & 4 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -516,23 +516,36 @@ MCP Tools can operate as both a client and a server, with two server modes avail
The mock server mode creates a simulated MCP server for testing clients without implementing a full server:

```bash
# Create a mock server with a simple tool
# Create a mock server with a simple tool (stdio transport - default)
mcp mock tool hello_world "A simple greeting tool"

# Create a mock server with multiple entity types
mcp mock tool hello_world "A greeting tool" \
# Create a mock server with HTTP transport (for Docker/Kubernetes deployment)
mcp mock --port 3000 tool hello_world "A greeting tool" \
prompt welcome "A welcome prompt" "Hello {{name}}, welcome to {{location}}!" \
resource docs://readme "Documentation" "Mock MCP Server\nThis is a mock server"
```

Features of the mock server:
#### Transport Options

The mock server supports two transport modes:

- **Stdio transport (default)**: Uses stdin/stdout, suitable for direct command-line use
- **HTTP transport**: Uses HTTP with JSON-RPC, suitable for containerized deployments

When using HTTP transport (`--port` flag), the server provides:
- **JSON-RPC endpoint**: `POST http://localhost:PORT/mcp`
- **SSE endpoint**: `GET http://localhost:PORT/sse` (for SSE-compatible clients)
- **Health check**: `GET http://localhost:PORT/health`

#### Features

- Full initialization handshake
- Tool listing with standardized schema
- Tool calling with simple responses
- Resource listing and reading
- Prompt listing and retrieval with argument substitution
- Detailed request/response logging to `~/.mcpt/logs/mock.log`
- Docker/Kubernetes ready with HTTP transport

#### Using Prompt Templates

Expand Down
45 changes: 36 additions & 9 deletions cmd/mcptools/commands/mock.go
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Expand Up @@ -10,6 +10,8 @@ import (

// MockCmd creates the mock command.
func MockCmd() *cobra.Command {
var port string

cmd := &cobra.Command{
Use: "mock [type] [name] [description] [content]...",
Short: "Create a mock MCP server with tools, prompts, and resources",
Expand All @@ -31,11 +33,20 @@ Available types:
- prompt <name> <description> <template>
- resource <uri> <description> <content>

Example:
Transport options:
- Default: stdin/stdout (stdio transport)
- --port <port>: HTTP SSE transport on specified port

Examples:
# Stdio transport (default)
mcp mock tool hello_world "when user says hello world, run this tool"
mcp mock tool hello_world "A greeting tool" \

# HTTP transport
mcp mock --port 3000 tool hello_world "A greeting tool" \
prompt welcome "A welcome prompt" "Hello {{name}}, welcome to {{location}}!" \
resource docs:readme "Documentation" "# Mock MCP Server\nThis is a mock server"`,
resource docs:readme "Documentation" "# Mock MCP Server\nThis is a mock server"

# Then connect to http://localhost:3000/sse`,
Args: cobra.MinimumNArgs(2),
Run: func(_ *cobra.Command, args []string) {
tools := make(map[string]string)
Expand Down Expand Up @@ -111,16 +122,32 @@ Example:
os.Exit(1)
}

fmt.Fprintf(os.Stderr, "Starting mock MCP server with %d tool(s), %d prompt(s), and %d resource(s)\n",
len(tools), len(prompts), len(resources))
fmt.Fprintf(os.Stderr, "Use Ctrl+C to exit\n")
if port != "" {
fmt.Fprintf(os.Stderr, "Starting HTTP mock MCP server with %d tool(s), %d prompt(s), and %d resource(s) on port %s\n",
len(tools), len(prompts), len(resources), port)
fmt.Fprintf(os.Stderr, "JSON-RPC endpoint: http://localhost:%s/mcp\n", port)
fmt.Fprintf(os.Stderr, "SSE endpoint: http://localhost:%s/sse (for SSE-compatible clients)\n", port)
fmt.Fprintf(os.Stderr, "Health check: http://localhost:%s/health\n", port)
fmt.Fprintf(os.Stderr, "Use Ctrl+C to exit\n")

if err := mock.RunMockServer(tools, prompts, resources); err != nil {
fmt.Fprintf(os.Stderr, "Error running mock server: %v\n", err)
os.Exit(1)
if err := mock.RunMockServerHTTP(tools, prompts, resources, port); err != nil {
fmt.Fprintf(os.Stderr, "Error running HTTP mock server: %v\n", err)
os.Exit(1)
}
} else {
fmt.Fprintf(os.Stderr, "Starting mock MCP server with %d tool(s), %d prompt(s), and %d resource(s)\n",
len(tools), len(prompts), len(resources))
fmt.Fprintf(os.Stderr, "Use Ctrl+C to exit\n")

if err := mock.RunMockServer(tools, prompts, resources); err != nil {
fmt.Fprintf(os.Stderr, "Error running mock server: %v\n", err)
os.Exit(1)
}
}
},
}

cmd.Flags().StringVar(&port, "port", "", "Start HTTP server on specified port (e.g., 3000). If not specified, uses stdio transport.")

return cmd
}
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