# NousResearch/hermes-agent · MCP tool schema repair for reserved parameter names

## Open now

- Nothing open on GitHub.

A bug where MCP tools with parameters named 'properties' or 'required' caused 400 errors, because the schema repair logic mistakenly treated the properties map itself as a schema node. Fixes address the _repair_object_shape function to handle per-entry keywords correctly.

## 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 #111479. Verify it addresses your case.
- **Recommended:** read PR #111479 (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-111479`. 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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

- #110530: MCP tool schemas 400 with \`"object" is not of types "boolean", "object"\` when a parameter is named \`properties\` (_repair_object_shape treats the properties map as a node)

## Prior & competing PRs

- **#111479: fix(mcp): tools with a parameter named properties/required no longer 400 every request (#110530, salvage #110537)**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `tests/tools/test_mcp_tool.py`, `tools/mcp_tool_schema.py`
- **#110537: fix(mcp): repair schema-map keywords per-entry in _repair_object_shape**. closed without merge
  - maintainer direction: category `implemented_elsewhere`; implication `superseded`; refs `798cc60f4c`, `3dbaffd814`, `#111479`

## Fix status

- Merged to main in PR #111479 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-09-15`.