michelligabrieleandGitHub 035f0916ad fix(mcp): revert StreamableHTTPSessionManager to stateless mode (#21323) ...

PR #19809 changed stateless=True to stateless=False to enable progress
notifications for MCP tool calls. This caused the mcp library to enforce
mcp-session-id headers on all non-initialize requests, breaking MCP
Inspector, curl, and any client without automatic session management.

Revert to stateless=True to restore compatibility with all MCP clients.
The progress notification code already handles missing sessions gracefully
(defensive checks + try/except), so no other changes are needed.

Fixes #20242

2026-02-16 09:08:44 -08:00

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mcp_server

fix(mcp): revert StreamableHTTPSessionManager to stateless mode (#21323)

2026-02-16 09:08:44 -08:00