{"repo":"NousResearch/hermes-agent","public_id":"114350","display_label":"Streamable HTTP MCP client connection and negotiation fixes","summary":"These issues and fixes address bugs in the Streamable HTTP MCP client: improving error messages to surface HTTP status, URL, and body on failures, and correcting protocol version negotiation during the handshake.","subsystem":null,"counts":{"members":3,"open_issues":0,"open_issues_distinct":0,"open_prs":0,"closed_issues":1,"merged_prs":1,"attempt_prs":1},"landed_fix":{"status":"merged_to_main","basis":"structural","pr":114817,"merged_at":"2026-09-18T19:48:43+00:00"},"resolution":{"state":"resolved","by":"pr-114817"},"freshness":{"state":"verified","last_verified_at":"2026-09-18T19:48:43+00:00","is_stale":false},"grouping":{"backbone":"STRUCTURAL_SPANNING","link_density":0.6666666666666666},"fix_edges":[{"issue_number":113359,"pr_number":114817,"tier":"verified","basis":"closing_ref","confidence":0.95,"recoverable_from_timeline":true,"pr_merged_at":"2026-09-18T19:48:43+00:00"},{"issue_number":114350,"pr_number":114817,"tier":"verified","basis":"closing_ref","confidence":0.95,"recoverable_from_timeline":true,"pr_merged_at":"2026-09-18T19:48:43+00:00"}],"members":[{"kind":"issue","number":114350,"title":"[Bug]: Streamable HTTP MCP client fails against a server that negotiates a non-latest protocol version","url":null,"state":"closed"},{"kind":"pr","number":114381,"title":"fix(mcp): don't advertise an unnegotiated MCP-Protocol-Version on the streamable HTTP handshake","url":null,"state":"closed","close_reason":{"refs":[{"kind":"pr","value":"#113392","number":113392}],"category":"superseded_by_pr","implication":"superseded"},"merged":false},{"kind":"pr","number":114817,"title":"fix(mcp): Streamable HTTP connect failures name the HTTP status, URL and body behind \"Server returned an error response\" (#113359, #114350, salvage #113392)","url":null,"state":"merged","close_reason":{"category":"merged"},"merged":true,"is_fix_pr":true,"fix_tier":"verified","files_changed":["tests/tools/test_mcp_protocol_negotiation.py","tests/tools/test_mcp_sse_fallback.py","tools/mcp_tool.py","tools/mcp_tool_errors.py","tools/mcp_tool_transport.py","website/docs/user-guide/features/mcp.md"]}],"trust":{"default_tier":"verified","includes_suggested":false}}