Run MCP Streamable HTTP server in stateless mode - #251
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The server used rmcp's default stateful_mode, keeping every session in LocalSessionManager's RAM. Any restart of the backend invalidated existing session IDs; clients that did not renegotiate initialize — observed with Gemini CLI — kept reusing the stale ID and received 404 Not Found indefinitely. PortfolioServer only exposes request/response tools and does not rely on server-initiated SSE streams, so stateless mode covers the full surface while making each request self-contained and immune to session loss across restarts.
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The server used rmcp's default stateful_mode, keeping every session in LocalSessionManager's RAM. Any restart of the backend invalidated existing session IDs; clients that did not renegotiate initialize — observed with Gemini CLI — kept reusing the stale ID and received 404 Not Found indefinitely.
PortfolioServer only exposes request/response tools and does not rely on server-initiated SSE streams, so stateless mode covers the full surface while making each request self-contained and immune to session loss across restarts.