# NousResearch/hermes-agent · MCP sampling crashes on non-object JSON arguments

## Open now

- 1 issue, 1 PR open on GitHub.
- #105551: \[Bug\]: MCP sampling crashes on valid non-object JSON tool arguments
- PR #105559: fix: wrap valid non-object JSON MCP sampling tool arguments as {"_raw": ...}

A bug where MCP sampling fails when tool arguments are valid JSON but not objects (e.g., arrays or primitives). Fixes involve normalizing or wrapping such values to prevent crashes.

## TL;DR

- 3 member(s): 1 open issue(s), 0 closed issue(s), 1 open PR(s), 0 merged PR(s), 1 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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 `0.67`: 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.

## Open related issues

- #105551: \[Bug\]: MCP sampling crashes on valid non-object JSON tool arguments

## Prior & competing PRs

- **#105559: fix: wrap valid non-object JSON MCP sampling tool arguments as {"_raw": ...}**. open
  - maintainer direction: category `uncategorized`; implication `needs_llm`
  - files: `tests/tools/test_mcp_tool.py`, `tools/mcp_tool_sampling.py`
- **#105563: fix(mcp): normalize non-object sampling arguments**. closed without merge
  - maintainer direction: category `duplicate_of`; implication `duplicate`; refs `#105559`

## Fix status

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