# NousResearch/hermes-agent · Fix session poisoning from encrypted content 400 errors

## Open now

- Nothing open on GitHub.

A bug where certain 400 error responses (encrypted content and related provider-specific errors) were not recognized as recoverable, causing sessions to be permanently poisoned. The fixes add handling so these errors recover gracefully instead of breaking the session.

## 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 #111437. Verify it addresses your case.
- **Recommended:** read PR #111437 (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-111437`. 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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

- #111309: \[Bug\]: opencode-zen wrapped "encrypted_content was not issued to this caller" 400 is not classified as invalid_encrypted_content — session permanently poisoned, forces new session

## Prior & competing PRs

- **#111437: fix(agent): opencode-zen encrypted-reasoning and NVIDIA NIM tool-content 400s now recover instead of poisoning the session (#111309, #111231, salvage #111312 #111236)**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `agent/error_classifier.py`, `tests/agent/test_error_classifier.py`, `tests/agent/test_multimodal_tool_content_recovery.py`
- **#111312: fix(agent): recover OpenCode Zen encrypted replay errors**. closed without merge
  - maintainer direction: category `uncategorized`; implication `needs_llm`; refs `#109578`, `#109572`, `#111309`

## Fix status

- Merged to main in PR #111437 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-09-15`.