# NousResearch/hermes-agent · Strip unsupported cache retention param at wire boundary

## Open now

- Nothing open on GitHub.

A bug was identified where prompt_cache_retention was being sent to models that do not support it. These issues and PRs address stripping that parameter at the wire boundary in the Codex tool.

## 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 #90243. Verify it addresses your case.
- **Recommended:** read PR #90243 (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-90243`. 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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

- #89897: \[Bug\]: Codex tool follow-ups can send unsupported prompt_cache_retention to gpt-5.6-sol

## Prior & competing PRs

- **#90243: fix(codex): strip unsupported cache retention at the consumer Codex wire (salvages #89969)**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `agent/codex_runtime.py`, `contributors/emails/[redacted:email]`, `tests/agent/test_relay_llm.py`, `tests/run_agent/test_run_agent_codex_responses.py`
- **#89969: fix(codex): strip unsupported cache retention at wire**. closed without merge
  - maintainer direction: category `merged_via`; implication `superseded`; refs `8e2949495a`, `8430c1b4da`, `#90243`
- **#90195: fix(codex): strip unsupported prompt_cache_retention at wire boundary (#89897)**. closed without merge
  - maintainer direction: category `merged_via`; implication `superseded`; refs `09b567b7a8`, `a305ed2ba3`, `8e2949495a`, `8430c1b4da`, `#89969`, `#90243`

## Fix status

- Merged to main in PR #90243 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-08-19`.
- Subsystem: `agent`