# NousResearch/hermes-agent · MCP discovery failures from empty cacheScope values

## Open now

- 1 issue, 1 PR open on GitHub.
- #94992: MCP discovery fails when a server returns an empty cacheScope
- PR #94995: fix(mcp): tolerate empty list cache scope

These issues and pull requests address MCP server discovery failures caused by empty or unexpected cacheScope values, including fixes to treat empty cacheScope as omitted and SDK upgrades for related compatibility.

## TL;DR

- 4 member(s): 1 open issue(s), 0 closed issue(s), 1 open PR(s), 0 merged PR(s), 2 PR(s) closed without merging.
- No fix has been merged to main; one or more PRs were attempted (see below).
- **Recommended:** review the prior/competing PR(s) below. A fix was attempted but not merged; your case may extend or revive that work.

## Maintainer resolution verdict

- Internal-tracker verdict over this cluster's issue members: `unresolved`. 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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 `0.50`: 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.

## Open related issues

- #94992: MCP discovery fails when a server returns an empty cacheScope

## Prior & competing PRs

- **#94995: fix(mcp): tolerate empty list cache scope**. open
  - maintainer direction: category `uncategorized`; implication `needs_llm`
  - files: `tests/tools/test_mcp_cache_scope_compat.py`, `tools/mcp_tool.py`
- **#95145: fix(mcp): treat empty cacheScope as omitted to prevent discovery failure (#94992)**. closed without merge
  - maintainer direction: category `duplicate_of`; implication `duplicate`; refs `#94995`
- **#105438: fix(mcp): upgrade SDK for cross-revision responses**. closed without merge
  - maintainer direction: category `uncategorized`; implication `needs_llm`

## Fix status

- No merged fix on record.
- Subsystem: `mcp`