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fix: cap prompt_cache_key at 64 chars to avoid OpenAI Codex 400 error (#66045) #66053

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fix: cap prompt_cache_key at 64 chars to avoid OpenAI Codex 400 error (#66045) #66053

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3 changes: 3 additions & 0 deletions agent/transports/codex.py
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Original file line number Diff line number Diff line change
Expand Up @@ -265,6 +265,9 @@ def build_kwargs(
# the cache-scope routing headers below. Falls back to session_id when
# there is no static content to hash.
cache_key = _content_cache_key(instructions, response_tools) or session_id
# OpenAI rejects prompt_cache_key > 64 chars with HTTP 400.
if cache_key and len(cache_key) > 64:
cache_key = cache_key[:64]
# xAI Responses takes prompt_cache_key in extra_body (set further
# down); GitHub Models opts out of cache-key routing entirely.
if not is_github_responses and not is_xai_responses and cache_key:
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