# NousResearch/hermes-agent · Oversized item IDs causing 400 errors in Responses API

## Open now

- Nothing open on GitHub.

Multiple fixes and reports address a problem where replayed message, reasoning, or call IDs exceeding length limits trigger HTTP 400 'string_above_max_length' errors in the Responses API. The cluster covers stripping, clamping, or dropping these oversized IDs across various replay scenarios.

## TL;DR

- 8 member(s): 0 open issue(s), 2 closed issue(s), 0 open PR(s), 2 merged PR(s), 4 PR(s) closed without merging.
- A fix was merged to main in PR #62225. Verify it addresses your case.
- **Recommended:** read PR #62225 (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-62225,pr-73538`. 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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 `0.26`: 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

- #10788: Codex (OpenAI Responses) provider hits 400 "string_above_max_length" on multi-turn — reasoning item \`id\` exceeds 64-char limit
- #27038: bug: Codex Responses API rejects replayed assistant message items with long id fields

## Prior & competing PRs

- **#27143: fix(codex): strip oversized message item ids on replay to prevent HTTP 400**. closed without merge · fix tier `suggested`
  - maintainer direction: category `superseded_by_pr`; implication `superseded`; refs `#17318`
  - _suggested-tier fix detail withheld; re-request with `?tier=all` to include it._
- **#62225: fix(codex): drop oversized message ids on Responses input replay**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`; implication `superseded`
  - files: `agent/codex_responses_adapter.py`, `tests/agent/test_codex_responses_adapter.py`
- **#73538: fix(codex): clamp oversized Responses call_id so MCP tools don't brick sessions (#73492)**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`; implication `superseded`
  - files: `agent/codex_responses_adapter.py`, `tests/agent/test_codex_responses_adapter.py`
- **#10796: fix(codex): drop reasoning item ids > 64 chars**. closed without merge
  - maintainer direction: category `silent_close`; implication `active`
- **#33306: fix: strip oversized item ids from Responses API replay (#10788)**. closed without merge
  - maintainer direction: category `implemented_elsewhere`; implication `superseded`; refs `0b2907f586552bbfd87f54ceda5d1a7343ea5cc9`, `#62225`
- **#35488: fix(codex_responses_adapter): drop cross-issuer message ids on replay**. closed without merge
  - maintainer direction: category `superseded_by_pr`; implication `superseded`; refs `#62225`, `#27038`

## Fix status

- Merged to main in PR #62225 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-07-28`.
- Subsystem: `agent`