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fix: implement MCP protocol version negotiation

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Claude Desktop requests protocol version 2025-06-18 but Vestige was
responding with 2025-11-25, causing Claude Desktop to disconnect.

Now the server negotiates: if the client requests an older version,
use it. This maintains backward compatibility with older clients.

Fixes: Claude Desktop "Server transport closed unexpectedly" error

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Sam Valladares 2026-01-27 00:59:53 -06:00
parent ab1a3a885a
commit 6ccbc7d2c0
1 changed files with 12 additions and 3 deletions
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15
crates/vestige-mcp/src/server.rs
View file

@ -73,16 +73,25 @@ impl McpServer {
&mut self, &mut self,
params: Option<serde_json::Value>, params: Option<serde_json::Value>,
) -> Result<serde_json::Value, JsonRpcError> { ) -> Result<serde_json::Value, JsonRpcError> {
let _request: InitializeRequest = match params { let request: InitializeRequest = match params {
Some(p) => serde_json::from_value(p).map_err(|e| JsonRpcError::invalid_params(&e.to_string()))?, Some(p) => serde_json::from_value(p).map_err(|e| JsonRpcError::invalid_params(&e.to_string()))?,
None => InitializeRequest::default(), None => InitializeRequest::default(),
}; };
// Version negotiation: use client's version if older than server's
// Claude Desktop rejects servers with newer protocol versions
let negotiated_version = if request.protocol_version < MCP_VERSION.to_string() {
info!("Client requested older protocol version {}, using it", request.protocol_version);
request.protocol_version.clone()
} else {
MCP_VERSION.to_string()
};
self.initialized = true; self.initialized = true;
info!("MCP session initialized"); info!("MCP session initialized with protocol version {}", negotiated_version);
let result = InitializeResult { let result = InitializeResult {
protocol_version: MCP_VERSION.to_string(), protocol_version: negotiated_version,
server_info: ServerInfo { server_info: ServerInfo {
name: "vestige".to_string(), name: "vestige".to_string(),
version: env!("CARGO_PKG_VERSION").to_string(), version: env!("CARGO_PKG_VERSION").to_string(),