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fix: deduplicate reasoning items in Responses API input

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When replaying codex_reasoning_items from previous turns,
duplicate item IDs (rs_*) could appear in the input array,
causing HTTP 400 "Duplicate item found" errors from the
OpenAI Responses API.

Add seen_item_ids tracking in both _chat_messages_to_responses_input()
and _preflight_codex_input_items() to skip already-added reasoning
items by their ID.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
sauljwu 2026-04-11 17:17:19 -04:00 • committed by Teknium
parent ef73babea1
commit dfe7386a58
1 changed files with 12 additions and 1 deletions
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13
run_agent.py
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@ -3446,6 +3446,7 @@ class AIAgent:
def _chat_messages_to_responses_input(self, messages: List[Dict[str, Any]]) -> List[Dict[str, Any]]:
"""Convert internal chat-style messages to Responses input items."""
items: List[Dict[str, Any]] = []
seen_item_ids: set = set()
for msg in messages:
if not isinstance(msg, dict):
@ -3466,7 +3467,12 @@ class AIAgent:
if isinstance(codex_reasoning, list):
for ri in codex_reasoning:
if isinstance(ri, dict) and ri.get("encrypted_content"):
item_id = ri.get("id")
if item_id and item_id in seen_item_ids:
continue
items.append(ri)
if item_id:
seen_item_ids.add(item_id)
has_codex_reasoning = True
if content_text.strip():
@ -3546,6 +3552,7 @@ class AIAgent:
raise ValueError("Codex Responses input must be a list of input items.")
normalized: List[Dict[str, Any]] = []
seen_ids: set = set()
for idx, item in enumerate(raw_items):
if not isinstance(item, dict):
raise ValueError(f"Codex Responses input[{idx}] must be an object.")
@ -3598,8 +3605,12 @@ class AIAgent:
if item_type == "reasoning":
encrypted = item.get("encrypted_content")
if isinstance(encrypted, str) and encrypted:
reasoning_item = {"type": "reasoning", "encrypted_content": encrypted}
item_id = item.get("id")
if isinstance(item_id, str) and item_id:
if item_id in seen_ids:
continue
seen_ids.add(item_id)
reasoning_item = {"type": "reasoning", "encrypted_content": encrypted}
if isinstance(item_id, str) and item_id:
reasoning_item["id"] = item_id
summary = item.get("summary")