[go-fan] Go Module Review: modelcontextprotocol/go-sdk

# 🐹 Go Fan Report: modelcontextprotocol/go-sdk

## Module Overview

The **official Go SDK for Model Context Protocol (MCP)** servers and clients, maintained in collaboration with Google. This is the **core dependency** that enables gh-aw-mcpg to function as an MCP gateway, providing protocol implementation for stdio, HTTP, SSE, and streamable transports.

**Repository**: https://github.com/modelcontextprotocol/go-sdk  
**Stars**: 3,745+ ⭐  
**Last Updated**: 2026-02-02T07:05:15Z (Updated TODAY! 🎉)

## Current Usage in gh-aw-mcpg

**Version**: v1.1.0 (from go.mod)  
**Files Using Module**: 20 files across the codebase  
**Key APIs Used**:
- Client creation: `sdk.NewClient()`, `sdk.ClientSession`
- Transports: `CommandTransport`, `StreamableClientTransport`, `SSEClientTransport`
- Server: `NewStreamableHTTPHandler()`, `StreamableHTTPOptions`
- Session operations: `ListTools()`, `CallTool()`, `ListResources()`, `ReadResource()`, `ListPrompts()`, `GetPrompt()`

### Usage Breakdown
- **Core Connection** (`internal/mcp/connection.go`): Client, session, transport management
- **Server Transport** (`internal/server/transport.go`): Streamable HTTP handler for MCP protocol
- **Server Logic** (`internal/server/routed.go`, `unified.go`): Server initialization
- **Middleware** (`internal/middleware/jqschema.go`): Tool result processing
- **Testing** (15 files): Comprehensive test coverage using SDK types

## Research Findings

### Recent Updates (Repository Updated TODAY!)

#### v1.2.0 (Latest Stable - 2025-12-22)
**Major Features**:
- ✅ Support for MCP Spec 2025-11-25 (icons, metadata, tool name validation)
- ✅ Common error codes via `jsonrpc.Error` sentinel values
- ✅ OAuth 2.0 Protected Resource Metadata support
- ✅ Security: `UserID` in `TokenInfo` for session hijacking prevention
- ✅ Streamable transport improvements (SSE, context cancellation, transient errors)
- ✅ Windows CRLF handling, connection reuse improvements

#### v1.3.0-pre.1 (Latest Pre-release - 2026-01-27)
**Performance Breakthrough** 🚀:
- **Schema Caching**: 132x faster tool registration (161µs → 1.2µs per tool)
- 51x fewer allocations, 32x less memory per tool registration
- Critical for stateless server deployments with many tools

**New Features**:
- `DisableListening` option for `StreamableClientTransport` (reduce resource usage)
- Exported `GetError` and `SetError` methods for error manipulation
- Fixed race condition in logging
- HTTP 405 responses now include Allow header per RFC 9110

### Best Practices from Maintainers

1. **Logging**: Use `ServerOptions.Logger` and `ClientOptions.Logger` for integrated logging
2. **Timeouts**: Configure `StreamableHTTPOptions.SessionTimeout` to prevent resource leaks
3. **Resource Optimization**: Use `DisableListening: true` if server notifications aren't needed
4. **Error Handling**: Use standardized `jsonrpc.Error` codes for interoperability
5. **Version Tracking**: Set meaningful `Implementation.Version` for debugging
6. **Security**: Set `UserID` in `TokenInfo` to prevent session hijacking (v1.2.0+)

## Improvement Opportunities

### 🏃 Quick Wins

#### 1. Upgrade to v1.2.0 (Stable Release) ⚡
**Location**: `go.mod`  
**Benefit**: Security fixes, bug fixes, MCP spec 2025-11-25 support  
**Risk**: Low (mostly additive changes, well-tested in production)  
**Action**: `go get -u github.com/modelcontextprotocol/go-sdk@v1.2.0`  
**Impact**: **HIGH** - Security and stability improvements

**Why Now**: v1.2.0 includes session hijacking prevention, streamable transport bug fixes, and better error handling - all critical for a production gateway.

#### 2. Add Logger to StreamableHTTPOptions ⚡
**Location**: `internal/server/transport.go:99`  
**Current**:
```go
&sdk.StreamableHTTPOptions{
    Stateless: false,
}
```

**Suggested**:
```go
&sdk.StreamableHTTPOptions{
    Stateless: false,
    Logger:    logTransport, // Use existing logger
}
```

**Benefit**: Integrate SDK logging with project's logger framework for better debugging  
**Impact**: **MEDIUM** - Improved observability and debugging

#### 3. Add SessionTimeout to StreamableHTTPOptions ⚡
**Location**: `internal/server/transport.go:99`  
**Suggested**:
```go
&sdk.StreamableHTTPOptions{
    Stateless: false,
    Logger:    logTransport,
    SessionTimeout: 30 * time.Minute, // Configurable timeout
}
```

**Benefit**: Prevent resource leaks from idle connections  
**Impact**: **MEDIUM** - Resource management and stability

#### 4. Add DisableListening to StreamableClientTransport 💡
**Location**: `internal/mcp/connection.go:362`  
**Suggested**:
```go
&sdk.StreamableClientTransport{
    URL:              url,
    HTTPClient:       httpClient,
    DisableListening: true, // Optional: disable if not needed
}
```

**Benefit**: Reduce resource usage if server notifications aren't needed  
**Impact**: **LOW-MEDIUM** - Depends on usage pattern, but eliminates unnecessary SSE connections

### ✨ Feature Opportunities

#### 1. Add Client-Side Logging
**Location**: `internal/mcp/connection.go:76-80`  
**Suggested**:
```go
func newMCPClient() *sdk.Client {
    return sdk.NewClient(&sdk.Implementation{
        Name:    "awmg",
        Version: GetVersion(), // Use actual project version
    }, &sdk.ClientOptions{
        Logger: logger.New("sdk:client"),
    })
}
```

**Benefit**: Integrated client-side SDK logging for better debugging  
**Impact**: **MEDIUM** - Better client-side diagnostics

#### 2. Use Standardized jsonrpc.Error Codes (v1.2.0+)
**Location**: Error handling throughout codebase  
**Benefit**: Better interoperability with other MCP implementations  
**Action**: Review and migrate custom error codes to `jsonrpc.Error` sentinel values  
**Impact**: **MEDIUM** - Improved compatibility and standards compliance

#### 3. Consider v1.3.0-pre.1 for Performance (When Stable)
**Benefit**: Schema caching provides 132x speedup for tool registration  
**Use Case**: Particularly valuable if moving to stateless server architecture  
**Action**: Monitor for v1.3.0 stable release (expected soon, pre-release from 2026-01-27)  
**Impact**: **HIGH** (for stateless scenarios) / **LOW** (for current stateful architecture)

### 📐 Best Practice Alignment

#### 1. Update Implementation Version to Use Project Version
**Location**: `internal/mcp/connection.go:79`  
**Current**: Hardcoded `"1.0.0"`  
**Suggested**: Read from `version.go` or build-time variable  
**Benefit**: Accurate version reporting for debugging and monitoring  
**Impact**: **LOW** - Better diagnostics

#### 2. Review MCP Spec 2025-11-25 Features (v1.2.0)
**Available Features**:
- Icons and metadata support
- Tool name validation
- Elicitation improvements (defaults, URL mode, enum improvements)

**Action**: Determine if any features would enhance the gateway  
**Impact**: **MEDIUM** - Potential UX improvements

### 🔧 General Improvements

1. **Monitor for v1.3.0 Stable Release**
   - Schema caching performance boost (132x faster)
   - Logging race condition fix
   - Better error handling exports
   - **Timeline**: Pre-release published 2026-01-27, stable expected soon

2. **Consider OAuth 2.0 Support** (v1.2.0)
   - Available in `auth` and `oauthex` packages
   - Current: Simple API key authentication
   - Potential for enterprise use cases

3. **Leverage New Capability Configuration** (v1.2.0)
   - `Capabilities` fields in `ServerOptions`/`ClientOptions`
   - Simplifies capability configuration vs manual setup

## Recommendations

### Priority 1 (Immediate) ⚡
1. **Upgrade to v1.2.0** - Security fixes, bug fixes, MCP spec compliance
2. **Add Logger to StreamableHTTPOptions** - Better debugging and monitoring

### Priority 2 (Short-term) 💡
3. **Add SessionTimeout** - Prevent resource leaks
4. **Update Implementation.Version** - Use actual project version
5. **Add Client Logger** - Client-side debugging

### Priority 3 (Medium-term) 🔍
6. **Consider DisableListening** - Optimize resource usage
7. **Review jsonrpc.Error Migration** - Better interoperability
8. **Evaluate MCP Spec 2025-11-25 Features** - Potential UX enhancements

### Future Monitoring 📡
- Watch for v1.3.0 stable (schema caching performance boost)
- Consider OAuth 2.0 support for enterprise scenarios
- Stay current with MCP specification updates

## Next Steps

1. **Upgrade Path**: v1.1.0 → v1.2.0 (stable, well-tested, low risk)
2. **Configuration Enhancement**: Add logging and timeout options to `StreamableHTTPOptions`
3. **Version Tracking**: Use dynamic project version in SDK client initialization
4. **Future Planning**: Monitor v1.3.0 for performance improvements

## Summary

**Overall Assessment**: The project uses modelcontextprotocol/go-sdk **effectively but conservatively**. The current usage (v1.1.0) is solid and functional, but upgrading to v1.2.0 and adding a few configuration options would provide **immediate benefits** with **minimal risk**.

**Key Insights**:
- ✅ **Core dependency** that powers the entire MCP gateway
- ✅ **Well-maintained** by official MCP team + Google (updated today!)
- ✅ **Stable foundation** with correct API usage patterns
- ⚠️ **Version lag** - v1.1.0 vs v1.2.0 stable (missing security fixes)
- ⚠️ **Minimal configuration** - not leveraging logging, timeouts, or resource optimization

**Low Risk, High Value**: All suggested improvements are backward-compatible additions that enhance observability, security, and reliability without breaking existing functionality.

---

*Generated by Go Fan 🐹*  
*Module summary saved to: `/tmp/gh-aw/cache-memory/go-fan-go-sdk-summary.md`*  
*Reviewed: 2026-02-02*  
*Repository Status: Active development, updated today!*








> AI generated by [Go Fan](https://github.com/githubnext/gh-aw-mcpg/actions/runs/21581099936)

[go-fan] Go Module Review: modelcontextprotocol/go-sdk #580

Description

🐹 Go Fan Report: modelcontextprotocol/go-sdk

Module Overview

Current Usage in gh-aw-mcpg

Usage Breakdown

Research Findings

Recent Updates (Repository Updated TODAY!)

v1.2.0 (Latest Stable - 2025-12-22)

v1.3.0-pre.1 (Latest Pre-release - 2026-01-27)

Best Practices from Maintainers

Improvement Opportunities

🏃 Quick Wins

1. Upgrade to v1.2.0 (Stable Release) ⚡

2. Add Logger to StreamableHTTPOptions ⚡

3. Add SessionTimeout to StreamableHTTPOptions ⚡

4. Add DisableListening to StreamableClientTransport 💡

✨ Feature Opportunities

1. Add Client-Side Logging

2. Use Standardized jsonrpc.Error Codes (v1.2.0+)

3. Consider v1.3.0-pre.1 for Performance (When Stable)

📐 Best Practice Alignment

1. Update Implementation Version to Use Project Version

2. Review MCP Spec 2025-11-25 Features (v1.2.0)

🔧 General Improvements

Recommendations

Priority 1 (Immediate) ⚡

Priority 2 (Short-term) 💡

Priority 3 (Medium-term) 🔍

Future Monitoring 📡

Next Steps

Summary

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

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