# NousResearch/hermes-agent · MCP tool registration and availability in ACP sessions

## Open now

- Nothing open on GitHub.

These items concern registering client-provided MCP servers as agent tools and fixing cases where MCP toolsets are dropped or not exposed—particularly across model switches and in TUI/CLI/gateway contexts.

## TL;DR

- 5 member(s): 0 open issue(s), 1 closed issue(s), 0 open PR(s), 1 merged PR(s), 3 PR(s) closed without merging.
- A fix was merged to main in PR #115303. Verify it addresses your case.
- **Recommended:** read PR #115303 (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-115303`. 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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 `0.40`: 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

- #42719: ACP-provided MCP tools are registered but dropped from the model request

## Prior & competing PRs

- **#115303: fix(acp): session MCP tools survive a model switch (#42719, salvage #42753)**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`; implication `superseded`
  - files: `acp_adapter/server.py`, `acp_adapter/session.py`, `tests/acp_adapter/test_acp_dashboard_model_switch_validation.py`, `tests/acp_adapter/test_session.py`
- **#30658: fix(acp): model switch via set_session_model discards ACP-injected MCP toolsets**. closed without merge
  - maintainer direction: category `merged_via`; implication `superseded`; refs `#115303`, `#42753`, `#30658`, `#42753`, `#75722`, `#104474`, `#67540`, `#107359`, `#115303`, `#115303`
- **#42753: fix(acp): preserve session MCP toolsets across model switches**. closed without merge
  - maintainer direction: category `merged_via`; implication `superseded`; refs `#115303`, `#42753`, `#30658`, `#42753`, `#75722`, `#104474`, `#67540`, `#107359`, `#115303`, `#115303`
- **#107359: fix(acp): preserve ACP-provided MCP tools across model switches and requests**. closed without merge
  - maintainer direction: category `merged_via`; implication `superseded`; refs `#115303`, `#42753`, `#30658`, `#42753`, `#75722`, `#104474`, `#67540`, `#107359`, `#115303`, `#115303`

## Fix status

- Merged to main in PR #115303 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-09-18`.
- Subsystem: `acp`