Performance

• Cap concurrent HTTP sessions with MCP_MAX_SESSIONS (overflow → HTTP 429).
• Set MCP_SESSION_TIMEOUT_MS so idle stateful sessions die.
• Prefer MCP_STATELESS=true for Inspector and horizontally scaled HTTP.
• dual transport runs stdio + HTTP as asyncio tasks in one event loop (shared DIContainer).
• Logging to stdout under stdio can corrupt the protocol stream — use NITROSTACK_LOG_FILE or NITROSTACK_LOG_TO_STDOUT=true only when you know it is safe.
• NITROSTACK_HTTP_DEBUG=1 logs method, path, headers, and body to stderr for client connect failures (uvicorn access logs omit this).

See Configuration and Dual Transport.