# NousResearch/hermes-agent · MCP tool name collision detection and rejection

## Open now

- Nothing open on GitHub.

These issues and PRs address a bug where sanitized MCP tool names can collide with one another, silently replacing valid tools. The work focuses on detecting and rejecting such ambiguous name collisions.

## TL;DR

- 4 member(s): 0 open issue(s), 1 closed issue(s), 0 open PR(s), 2 merged PR(s), 1 PR(s) closed without merging.
- A fix was merged to main in PR #73668. Verify it addresses your case.
- **Recommended:** read PR #73668 (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-73668`. 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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.

## Closed / duplicate issues

- #72032: \[Bug\]: Sanitized MCP tool names can collide and silently replace valid tools

## Prior & competing PRs

- **#62856: fix(mcp): guard discovery with cross-process lock**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `tests/tools/test_mcp_discovery_cross_process.py`, `tests/tools/test_mcp_tool.py`, `tools/mcp_tool.py`
- **#73668: fix: reject ambiguous MCP tool name collisions (salvage #72033)**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `tests/tools/test_mcp_tool.py`, `tests/tools/test_registry.py`, `tools/mcp_tool.py`, `tools/registry.py`
- **#72033: fix: reject ambiguous MCP tool name collisions**. closed without merge
  - maintainer direction: category `merged_via`; implication `superseded`; refs `20de37d409`, `#73668`, `#62856`

## Fix status

- Merged to main in PR #73668 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-07-28`.
- Subsystem: `mcp`