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fix(api_server): preserve conversation history when /v1/runs input is a message array

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When /v1/runs receives an OpenAI-style array of messages as input, all
messages except the last user turn are now extracted as conversation_history.
Previously only the last message was kept, silently discarding earlier
context in multi-turn conversations.

Handles multi-part content blocks by flattening text portions. Only fires
when no explicit conversation_history was provided.

Based on PR #5837 by pradeep7127.
This commit is contained in:
pradeep7127 2026-04-07 17:41:34 -07:00 • committed by Teknium
parent 786038443e
commit 1d5a69a445
1 changed files with 15 additions and 0 deletions
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15
gateway/platforms/api_server.py
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@ -1454,6 +1454,21 @@ class APIServerAdapter(BasePlatformAdapter):
if instructions is None:
instructions = stored.get("instructions")
# When input is a multi-message array, extract all but the last
# message as conversation history (the last becomes user_message).
# Only fires when no explicit history was provided.
if not conversation_history and isinstance(raw_input, list) and len(raw_input) > 1:
for msg in raw_input[:-1]:
if isinstance(msg, dict) and msg.get("role") and msg.get("content"):
content = msg["content"]
if isinstance(content, list):
# Flatten multi-part content blocks to text
content = " ".join(
part.get("text", "") for part in content
if isinstance(part, dict) and part.get("type") == "text"
)
conversation_history.append({"role": msg["role"], "content": str(content)})
session_id = body.get("session_id") or run_id
ephemeral_system_prompt = instructions