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Merge pull request #52 from guyernest/feature/server-refactoring-wasi-target
feat: v1.5.0 - Universal WASM/WASI MCP Server Support and Workflow Fixes
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‎.github/workflows/release-tester.yml‎

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cd target/${{ matrix.target }}/release
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if [ "${{ matrix.os }}" = "windows-latest" ]; then
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mv mcp-tester.exe ${{ matrix.asset_name }}
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# Convert Unix path to Windows path for gh command on Windows
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WIN_PATH=$(cygpath -w "$(pwd)/${{ matrix.asset_name }}")
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echo "ASSET_PATH=$WIN_PATH" >> $GITHUB_ENV
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# Use relative path from repo root for Windows
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echo "ASSET_PATH=target/${{ matrix.target }}/release/${{ matrix.asset_name }}" >> $GITHUB_ENV
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else
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mv mcp-tester ${{ matrix.asset_name }}
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echo "ASSET_PATH=$(pwd)/${{ matrix.asset_name }}" >> $GITHUB_ENV
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echo "ASSET_PATH=target/${{ matrix.target }}/release/${{ matrix.asset_name }}" >> $GITHUB_ENV
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fi
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- name: Get release tag

‎.github/workflows/release.yml‎

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env:
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GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
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run: |
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gh release create "${{ steps.get_version.outputs.VERSION }}" \
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--title "${{ steps.get_version.outputs.VERSION }}" \
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--notes "${{ steps.changelog.outputs.CHANGELOG }}" \
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--verify-tag
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# Check if release already exists
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if gh release view "${{ steps.get_version.outputs.VERSION }}" &>/dev/null; then
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echo "Release ${{ steps.get_version.outputs.VERSION }} already exists, skipping creation"
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else
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gh release create "${{ steps.get_version.outputs.VERSION }}" \
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--title "${{ steps.get_version.outputs.VERSION }}" \
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--notes "${{ steps.changelog.outputs.CHANGELOG }}" \
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--verify-tag
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fi
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publish-crate:
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name: Publish to crates.io

‎RELEASE_NOTES_v1.5.0.md‎

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# 🚀 PMCP v1.5.0: Write Once, Deploy Everywhere - WASM/WASI Universal MCP Servers
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## 🎯 Major Release: Platform-Agnostic MCP Architecture
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### ✨ Headline Feature: Universal WASM Deployment
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**Write once in Rust, deploy everywhere** - The same MCP server code now runs on Cloudflare Workers, Fermyon Spin, and any WASM/WASI-compliant platform, achieving true platform independence similar to the TypeScript SDK architecture.
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## 🏗️ Architecture Revolution: Clean Separation of Logic and Transport
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### 📐 New Architecture Design
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Following the TypeScript SDK's successful pattern, v1.5.0 introduces a clean separation between:
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- **Core MCP Logic**: Platform-agnostic business logic (`WasmMcpServer`)
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- **Transport Layer**: Thin platform-specific adapters (Cloudflare, Fermyon, etc.)
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- **Universal API**: Consistent interface across all deployment targets
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### 🎯 Key Achievement
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```rust
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// Same code runs everywhere
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let server = WasmMcpServer::builder()
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.name("my-mcp-server")
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.version("1.0.0")
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.tool("calculator", SimpleTool::new(...))
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.build();
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// Deploy to Cloudflare, Fermyon, or any WASM platform
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```
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## 🌟 Major New Features
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### 🔧 WasmMcpServer - Universal MCP Implementation
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- **Platform-agnostic core**: Single implementation for all WASM targets
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- **Type-safe builder pattern**: Compile-time validation of server configuration
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- **SimpleTool abstraction**: Easy tool creation with automatic JSON-RPC handling
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- **Full MCP protocol compliance**: Initialize, tools/list, tools/call, notifications
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- **Automatic error handling**: Built-in validation and error responses
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### 🌐 Multi-Platform Deployment Support
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#### Cloudflare Workers
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- **Global edge deployment**: 200+ locations worldwide
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- **V8 Isolates**: Sub-millisecond cold starts
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- **KV & Durable Objects**: Integrated state management
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- **Cost-effective**: Pay-per-request pricing model
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#### Fermyon Spin
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- **Standard WASI**: Uses `wasm32-wasip1` target
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- **Component Model**: First-class WASI component support
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- **Built-in SQLite**: Persistent storage capabilities
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- **Simple deployment**: Single `spin deploy` command
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### 🧪 Enhanced Testing Infrastructure
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#### MCP Tester Improvements
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- **Scenario-based testing**: YAML/JSON test definitions
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- **Comprehensive assertions**: Success, failure, contains, equals, array operations
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- **Verbose mode support**: Detailed test output with `--verbose` flag
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- **HTTP/JSON-RPC alignment**: Full protocol compliance testing
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#### Test Scenarios
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- **calculator-test.yaml**: Comprehensive test suite with error cases
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- **calculator-simple.json**: Basic operation validation
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- **minimal-test.json**: Quick connectivity verification
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### 🔄 Transport Layer Improvements
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- **JSON-RPC notification handling**: Proper detection of requests without 'id' field
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- **Empty response support**: Handle 200 OK with no Content-Type (notifications)
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- **Platform-specific adapters**: Minimal boilerplate for each platform
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- **Error propagation**: Consistent error handling across transports
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## 📊 Performance & Scalability
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### 🚀 Deployment Metrics
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| Platform | Cold Start | Global Scale | State Management | Cost Model |
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|----------|------------|--------------|------------------|------------|
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| **Cloudflare** | 50-200ms | 200+ locations | KV, Durable Objects | Pay-per-request |
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| **Fermyon** | 100-300ms | Regional | SQLite | Instance-based |
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| **WASI Generic** | Varies | Custom | Platform-specific | Flexible |
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### ⚡ Runtime Performance
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- **Zero overhead abstraction**: No performance penalty for platform abstraction
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- **Compile-time optimization**: WASM optimization at build time
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- **Minimal binary size**: ~500KB WASM modules
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- **Memory efficient**: Low memory footprint per request
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## 🛠️ Developer Experience Improvements
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### 📦 Simplified Development
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```bash
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# Build once
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cargo build --target wasm32-unknown-unknown --release
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# Deploy anywhere
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wrangler deploy # Cloudflare
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spin deploy # Fermyon
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# ... any WASM platform
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```
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### 🔍 Testing Tools
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```bash
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# Test any deployment with scenarios
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mcp-tester scenario https://<your-deployment> test-scenarios/calculator-test.yaml
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# Verbose output for debugging
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mcp-tester tools --verbose https://<your-deployment>
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```
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### 📚 Comprehensive Documentation
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- Platform-specific deployment guides
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- Scenario testing documentation
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- Architecture overview with examples
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- Migration guides from v1.4.x
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## 🔧 Technical Improvements
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### Core SDK
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- **ServerCore refactoring**: Clean separation of concerns
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- **Protocol version negotiation**: Improved compatibility handling
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- **Type safety enhancements**: Stronger compile-time guarantees
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- **Error recovery**: Better error messages and recovery strategies
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### Quality & Testing
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- **100% scenario test pass rate**: All test scenarios passing
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- **Cross-platform validation**: Tested on multiple WASM runtimes
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- **Backward compatibility**: Full compatibility with existing MCP clients
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- **Toyota Way compliance**: Zero tolerance for defects
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## 🚀 Migration Guide
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### From v1.4.x to v1.5.0
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1. **Update dependency**: `pmcp = "1.5.0"`
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2. **Choose deployment model**:
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- Use `WasmMcpServer` for WASM deployments
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- Use existing `Server` for native deployments
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3. **Platform adapters**: Add thin wrapper for your platform
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4. **Test with scenarios**: Validate using mcp-tester
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### Example Migration
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```rust
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// Before (v1.4.x)
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let server = Server::builder()
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.tool(my_tool_handler)
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.build();
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// After (v1.5.0) - WASM deployment
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let server = WasmMcpServer::builder()
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.tool("my_tool", SimpleTool::new(my_tool_handler))
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.build();
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```
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## 📈 What's Next
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### Roadmap
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- Additional platform support (Wasmtime, WasmEdge, etc.)
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- State management abstractions
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- Cross-platform resource handlers
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- Enhanced debugging tools
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## 🙏 Acknowledgments
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Special thanks to all contributors who made this release possible, especially the work on clean architecture separation and comprehensive testing infrastructure.
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## 📦 Installation
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```toml
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[dependencies]
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pmcp = "1.5.0"
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```
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## 🔗 Resources
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- [Documentation](https://docs.rs/pmcp)
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- [Examples](https://github.com/paiml/rust-mcp-sdk/tree/main/examples)
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- [WASM Deployment Guide](https://github.com/paiml/rust-mcp-sdk/tree/main/examples/wasm-mcp-server)
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- [MCP Protocol Specification](https://modelcontextprotocol.io/)
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---
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**Breaking Changes**: None - Full backward compatibility maintained
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**Minimum Rust Version**: 1.70.0
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**License**: MIT

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