The MCP server shows a red dot (disconnected) in Augment Code's MCP interface.

I've created a debug wrapper that logs all communication: target/release/smart-diff-mcp-debug

Update your Augment MCP configuration to use:

/home/matteius/codediff/target/release/smart-diff-mcp-debug

Instead of:

/home/matteius/codediff/target/release/smart-diff-mcp

1. In Augment, toggle the smart-diff MCP server off and back on
2. Or restart Augment Code

cat /tmp/smart-diff-mcp-debug.log

This will show:

• What messages Augment is sending
• What the server is responding with
• Any errors

chmod +x /home/matteius/codediff/target/release/smart-diff-mcp

Make sure the path in Augment's config is absolute:

/home/matteius/codediff/target/release/smart-diff-mcp

The server expects MCP protocol version 2024-11-05. If Augment uses a different version, we may need to update the server.

MCP uses snake_case for JSON fields:

• ✅ protocol_version
• ❌ protocolVersion

If Augment sends camelCase, we need to add serde rename attributes.

Test the server manually to verify it works:

cd /home/matteius/codediff

# Test initialize
echo '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocol_version":"2024-11-05","capabilities":{},"client_info":{"name":"test","version":"1.0"}}}' | ./target/release/smart-diff-mcp

Expected response:

{"jsonrpc":"2.0","id":1,"result":{"protocolVersion":"2024-11-05","capabilities":{"tools":{},"resources":{}},"serverInfo":{"name":"smart-diff-mcp","version":"0.1.0"}}}

The server logs to stderr. To see them:

# Run with debug logging
RUST_LOG=debug ./target/release/smart-diff-mcp

Then send a test message in another terminal.

Run this to check everything:

#!/bin/bash
cd /home/matteius/codediff

echo "=== Checking Binary ==="
ls -lh target/release/smart-diff-mcp
file target/release/smart-diff-mcp

echo ""
echo "=== Testing Binary ==="
echo '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocol_version":"2024-11-05","capabilities":{},"client_info":{"name":"test","version":"1.0"}}}' | timeout 2 ./target/release/smart-diff-mcp 2>&1

echo ""
echo "=== Checking Debug Log ==="
if [ -f /tmp/smart-diff-mcp-debug.log ]; then
    echo "Last 50 lines of debug log:"
    tail -50 /tmp/smart-diff-mcp-debug.log
else
    echo "No debug log found. Server hasn't been run with debug wrapper yet."
fi

Augment might use a different MCP protocol version. Check the debug log to see what version it sends.

Some MCP implementations use camelCase instead of snake_case. We may need to add:

#[serde(rename = "protocolVersion")]
pub protocol_version: String,

You mentioned "might need to be an SSE" - Augment might expect HTTP/SSE transport instead of stdio.

If that's the case, we need to:

1. Add back the HTTP/SSE transport
2. Run the server in HTTP mode
3. Configure Augment to connect via HTTP URL instead of command path

Augment might use a slightly different message format. The debug log will show this.

1. Use the debug wrapper and check /tmp/smart-diff-mcp-debug.log
2. Share the log contents so we can see what Augment is actually sending
3. Check if Augment expects HTTP/SSE instead of stdio
4. Verify the protocol version Augment uses

If Augment expects an HTTP endpoint, we need to:

1. Rebuild with HTTP support (I can add this back)
2. Run the server in HTTP mode:

   ./target/release/smart-diff-mcp --mode http --port 3100

3. Configure Augment with the URL:

   http://127.0.0.1:3100
   

Let me know what you find in the debug log and I can help fix the specific issue!