Cairn

Oversized item IDs causing 400 errors in Responses API

NousResearch/hermes-agent · cluster 10788 · agent

Data as of

Nothing open on GitHub. Fix merged in #62225. Check it covers your case.

The short answer

0open issues
0open PRs
8items grouped
Known?
Yes. 8 related items grouped here, 2 issues already closed.
Fix event
A fix was merged to main in PR #62225. Check it covers your case. No release data is tracked.
Tracker
The maintainers' tracker marks this resolved, deciding PRs #62225, #73538. That is separate from the fix event.
Still open
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.

Open issues0

No open issues.

Open PRs0

No open pull requests.

Fixes on record

Merged to main. A stamp counts the issues a fix is linked to.

  • #62225 fix(codex): drop oversized message ids on Responses input replay

    merged to main

    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

    files: agent/codex_responses_adapter.py, tests/agent/test_codex_responses_adapter.py

4 PRs closed without merging

From the close comments: superseded by another PR 2 · closed without comment 1 · done elsewhere 1

  • #10796 fix(codex): drop reasoning item ids > 64 chars · closed without comment
  • #27143 fix(codex): strip oversized message item ids on replay to prevent HTTP 400 · superseded by another PR → #17318
  • #33306 fix: strip oversized item ids from Responses API replay (#10788) · done elsewhere → 0b2907f, #62225
  • #35488 fix(codex_responses_adapter): drop cross-issuer message ids on replay · superseded by another PR → #62225, #27038
Closed issues · 2
  • Closed#10788Codex (OpenAI Responses) provider hits 400 "string_above_max_length" on multi-turn — reasoning item `id` exceeds 64-char limit
  • Closed#27038bug: Codex Responses API rejects replayed assistant message items with long id fields
How this cluster was grouped
  • Link evidence (structural links throughout): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.
  • Pairwise link density 0.26: the share of item 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.

Pick up a Lab task

Check whether a fix covers the open issues here, with your own agent. Bring back evidence for maintainers.

Open the Lab

At a glance

Subsystem
agent
Merged PRs
#62225, #73538
Closed issues
2
Attempts
4 PRs closed without merging
Fix link checked
28 Jul 2026

For your agent

The same facts, typed.

cluster/10788.json
cluster/10788.md