# NousResearch/hermes-agent · Stripping non-standard outputSchema from tool definitions sent to providers

## Open now

- 1 issue, 2 PRs open on GitHub.
- #137128: \[Bug\]: \`function.outputSchema\` forwarded to OpenAI-compatible providers causes HTTP 400 on strict backends (e.g. GLM)
- PR #137133: fix(chat): strip MCP output schemas from wire tools
- PR #137141: fix(tools): strip non-standard keys from tools\[\].function before sending to providers

The members concern non-standard keys such as \`function.outputSchema\` (from MCP tools) being included in tool definitions sent to OpenAI-compatible providers, with a bug report citing HTTP 400 errors on strict backends like GLM. Two pull request titles propose removing these keys before sending; the titles alone don't confirm whether either was merged or whether the issue is closed.

## TL;DR

- 3 member(s): 1 open issue(s), 0 closed issue(s), 2 open PR(s), 0 merged PR(s), 0 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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

- #137128: \[Bug\]: \`function.outputSchema\` forwarded to OpenAI-compatible providers causes HTTP 400 on strict backends (e.g. GLM)

## Prior & competing PRs

- **#137133: fix(chat): strip MCP output schemas from wire tools**. open
  - maintainer direction: category `silent_close`; implication `active`
  - files: `agent/transports/chat_completions.py`, `tests/agent/transports/test_chat_completions.py`
- **#137141: fix(tools): strip non-standard keys from tools\[\].function before sending to providers**. open
  - maintainer direction: category `silent_close`; implication `active`
  - files: `tests/tools/test_schema_sanitizer.py`, `tools/schema_sanitizer.py`

## Fix status

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