{"repo":"NousResearch/hermes-agent","public_id":"53676","display_label":"MCP protocol version header handling fixes","summary":"Multiple issues and fixes related to the incorrect injection of the `mcp-protocol-version` header on the MCP `initialize` request, which violates the MCP spec and causes initialization failures with certain servers. Fixes also address SSE transport fallback behavior.","subsystem":"mcp","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":106432,"merged_at":"2026-09-13T04:05:30+00:00"},"resolution":{"state":"resolved","by":"pr-106432"},"freshness":{"state":"verified","last_verified_at":"2026-09-13T04:05:30+00:00","is_stale":false},"grouping":{"backbone":"STRUCTURAL_SPANNING","link_density":0.6666666666666666},"fix_edges":[{"issue_number":53676,"pr_number":106432,"tier":"verified","basis":"closing_ref","confidence":0.95,"recoverable_from_timeline":true,"pr_merged_at":"2026-09-13T04:05:30+00:00"}],"members":[{"kind":"issue","number":53676,"title":"[Bug]: MCP HTTP transport: wigai server fails to initialize, ends as 0 active MCP servers","url":null,"state":"closed"},{"kind":"pr","number":53764,"title":"fix(mcp): auto-fallback to SSE transport when Streamable HTTP returns…400","url":null,"state":"closed","close_reason":{"refs":[{"kind":"commit","value":"a565e2d49350","number":0},{"kind":"pr","value":"#106432","number":106432}],"category":"merged_via","implication":"superseded"},"merged":false},{"kind":"pr","number":106432,"title":"fix(mcp): SSE-only MCP servers now connect via automatic transport fallback (salvage #53764)","url":null,"state":"merged","close_reason":{"category":"merged"},"merged":true,"is_fix_pr":true,"fix_tier":"verified","files_changed":["tests/tools/test_mcp_sse_fallback.py","tools/mcp_tool.py","tools/mcp_tool_errors.py","tools/mcp_tool_transport.py"]}],"trust":{"default_tier":"verified","includes_suggested":false}}