# NousResearch/hermes-agent · Gemini function calls missing thought_signature handling

## Open now

- 1 issue, 2 PRs open on GitHub.
- #66587: \[Bug\]: HTTP 400: Gemini HTTP 400 (INVALID_ARGUMENT): Function call is missing  thought_signature in functionCall parts.
- PR #104345: fix(chat-completions): inject thought_signature sentinel for Gemini targets
- PR #124090: fix(gemini): gate tool call thought signatures on Gemini 3+ models

The members center on Gemini tool/function calls and the \`thought_signature\` field: one issue reports an HTTP 400 INVALID_ARGUMENT about a missing signature in functionCall parts, and three pull requests propose changes to how signatures are gated, replayed with a sentinel, or injected. Whether these changes address the reported error is not established by the titles.

## TL;DR

- 4 member(s): 1 open issue(s), 0 closed issue(s), 2 open PR(s), 0 merged PR(s), 1 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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 `0.50`: 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.

## Open related issues

- #66587: \[Bug\]: HTTP 400: Gemini HTTP 400 (INVALID_ARGUMENT): Function call is missing  thought_signature in functionCall parts.

## Prior & competing PRs

- **#104345: fix(chat-completions): inject thought_signature sentinel for Gemini targets**. open
  - maintainer direction: category `implemented_elsewhere`; implication `superseded`; refs `3d7071f651846c14bde8f51d3c3d1a25f90b849f`
  - files: `agent/chat_completion_helpers.py`, `agent/chat_completion_request_options.py`, `agent/transports/chat_completions.py`, `tests/agent/test_chat_completion_summary.py`, `tests/agent/transports/test_chat_completions.py`
- **#117927: fix(gemini): thought signature sentinel replay and parallel tool calls**. closed without merge
  - maintainer direction: category `silent_close`; implication `active`
- **#124090: fix(gemini): gate tool call thought signatures on Gemini 3+ models**. open
  - maintainer direction: category `uncategorized`; implication `needs_llm`
  - files: `agent/gemini_native_adapter.py`, `tests/agent/test_gemini_native_adapter.py`

## Fix status

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