# NousResearch/hermes-agent · Tool schema combinator compatibility fixes across AI APIs

## Open now

- Nothing open on GitHub.

Multiple bugs and fixes related to tool/function schemas using top-level combinators (anyOf, allOf, oneOf) that are rejected by OpenAI, Anthropic, and Codex APIs. A recurring concern is the schema sanitizer stripping or corrupting valid properties like dependentRequired while attempting to normalize schemas.

## TL;DR

- 4 member(s): 0 open issue(s), 1 closed issue(s), 0 open PR(s), 1 merged PR(s), 2 PR(s) closed without merging.
- A fix was merged to main in PR #64623. Verify it addresses your case.
- **Recommended:** read PR #64623 (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-64623`. 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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

- #64587: fix(tools): schema sanitizer corrupts dependentRequired on MCP tools (HTTP 400)

## Prior & competing PRs

- **#64623: fix(schema): preserve dependentRequired property names**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `tests/tools/test_schema_sanitizer.py`, `tools/schema_sanitizer.py`
- **#64928: fix(tools): preserve dependentRequired in schema sanitizer (#64587)**. closed without merge · fix tier `suggested`
  - maintainer direction: category `superseded_by_pr`; implication `superseded`; refs `#64623`
  - _suggested-tier fix detail withheld; re-request with `?tier=all` to include it._
- **#64667: fix(tools): preserve dependentRequired in schema sanitizer (#64587)**. closed without merge
  - maintainer direction: category `duplicate_of`; implication `duplicate`; refs `#64623`

## Fix status

- Merged to main in PR #64623 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-07-28`.
- Subsystem: `agent`