# MCP Java SDK Conformance Test Validation Results

## Summary

**Server Tests:** 37/40 passed (92.5%)  
**Client Tests:** 3/4 scenarios passed (9/10 checks passed)

## Server Test Results

### Passing (37/40)

- **Lifecycle & Utilities (4/4):** initialize, ping, logging-set-level, completion-complete
- **Tools (11/11):** All scenarios including progress notifications ✨
- **Elicitation (10/10):** SEP-1034 defaults (5 checks), SEP-1330 enums (5 checks)
- **Resources (4/6):** list, read-text, read-binary, templates-read
- **Prompts (4/4):** list, simple, with-args, embedded-resource, with-image
- **SSE Transport (2/2):** Multiple streams
- **Security (2/2):** Localhost validation passes, DNS rebinding protection

### Failing (3/40)

1. **resources-subscribe** - Not implemented in SDK
2. **resources-unsubscribe** - Not implemented in SDK  

## Client Test Results

### Passing (3/4 scenarios, 9/10 checks)

- **initialize (1/1):** Protocol negotiation, clientInfo, capabilities
- **tools_call (1/1):** Tool discovery and invocation
- **elicitation-sep1034-client-defaults (5/5):** Default values for string, integer, number, enum, boolean

### Partially Passing (1/4 scenarios, 1/2 checks)

- **sse-retry (1/2 + 1 warning):** 
  - ✅ Reconnects after stream closure
  - ❌ Does not respect retry timing
  - ⚠️ Does not send Last-Event-ID header (SHOULD requirement)

**Issue:** Client treats `retry:` SSE field as invalid instead of parsing it for reconnection timing.

## Known Limitations

1. **Resource Subscriptions:** SDK doesn't implement `resources/subscribe` and `resources/unsubscribe` handlers
2. **Client SSE Retry:** Client doesn't parse or respect the `retry:` field, reconnects immediately, and doesn't send Last-Event-ID header

## Running Tests

### Server
```bash
# Start server
cd conformance-tests/server-servlet
../../mvnw compile exec:java -Dexec.mainClass="io.modelcontextprotocol.conformance.server.ConformanceServlet"

# Run tests (in another terminal)
npx @modelcontextprotocol/conformance server --url http://localhost:8080/mcp --suite active
```

### Client
```bash
# Build
cd conformance-tests/client-jdk-http-client
../../mvnw clean package -DskipTests

# Run all scenarios
for scenario in initialize tools_call elicitation-sep1034-client-defaults sse-retry; do
  npx @modelcontextprotocol/conformance client \
    --command "java -jar target/client-jdk-http-client-0.18.0-SNAPSHOT.jar" \
    --scenario $scenario
done
```

## Recommendations

### High Priority
1. Fix client SSE retry field handling in `HttpClientStreamableHttpTransport`
2. Implement resource subscription handlers in `McpStatelessAsyncServer`

### Medium Priority
3. Add Host/Origin validation in `HttpServletStreamableServerTransportProvider` for DNS rebinding protection