# NousResearch/hermes-agent · MCP remote server connection and error reporting issues

## Open now

- Nothing open on GitHub.

These items concern failures connecting to remote MCP servers and improvements to error messaging, including exposing HTTP status codes, URLs, and response bodies, and fixing incorrect sticky header seeding for the MCP protocol version.

## TL;DR

- 3 member(s): 0 open issue(s), 1 closed issue(s), 0 open PR(s), 1 merged PR(s), 1 PR(s) closed without merging.
- A fix was merged to main in PR #114817. Verify it addresses your case.
- **Recommended:** read PR #114817 (and any competing PRs below) before filing. Confirm the merged change covers your symptom.

## Maintainer resolution verdict

- Internal-tracker verdict over this cluster's issue members: `resolved` · deciding PR(s): `pr-114817`. This is distinct from the fix status above. Weigh it yourself.

## How this cluster was grouped

- Link evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.
- Pairwise link density `0.67`: the share of member pairs that carry a link, counting a structural link in full and a relevance-only link at 0.36. `1.00` means every pair is linked.

## Closed / duplicate issues

- #113359: mcp 2.0.0: remote MCP server unreachable from Hermes while a raw POST to the same URL with the same token returns 200

## Prior & competing PRs

- **#114817: fix(mcp): Streamable HTTP connect failures name the HTTP status, URL and body behind "Server returned an error response" (#113359, #114350, salvage #113392)**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `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`
- **#113392: fix(mcp): do not seed mcp-protocol-version as sticky header; log endpoint (#113359)**. closed without merge
  - maintainer direction: category `superseded_by_pr`; implication `superseded`; refs `9bd8257c0274`, `#114817`, `#113359`, `#114350`, `#113392`

## Fix status

- Merged to main in PR #114817 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-09-18`.