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fix(compressor): pin summary role to user when only system prompt is protected (#52160)

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After the first compaction protect_first_n decays, so on a later compaction
the only protected head message can be the system prompt. Adapters like
Anthropic and Bedrock send the system prompt as a separate parameter, so the
summary becomes the first message in messages[] — and Anthropic rejects any
request whose first message is not role=user (HTTP 400). Pin the summary to
role=user when the head is system-only, and stop the collision-flip logic from
reverting it back to assistant.

Salvaged from #52167.

Co-authored-by: liuhao1024 <sunsky.lau@gmail.com>
This commit is contained in:
liuhao1024 2026-07-01 14:11:59 +05:30 • committed by kshitij
parent 82ac7e16b8
commit 8f4d195d5f
2 changed files with 110 additions and 2 deletions
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12
agent/context_compressor.py
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@ -2818,9 +2818,17 @@ This compaction should PRIORITISE preserving all information related to the focu
_merge_summary_into_tail = False
last_head_role = messages[compress_start - 1].get("role", "user") if compress_start > 0 else "user"
first_tail_role = messages[compress_end].get("role", "user") if compress_end < n_messages else "user"
# When the only protected head message is the system prompt, the
# summary becomes the first *visible* message in the API request
# (most adapters — Anthropic, Bedrock — send the system prompt as
# a separate ``system`` parameter, not inside ``messages[]``).
# Anthropic unconditionally rejects requests whose first message
# is not role=user, so we must pin the summary to "user" and
# prevent the flip logic below from reverting it (#52160).
_force_user_leading = last_head_role == "system"
# Pick a role that avoids consecutive same-role with both neighbors.
# Priority: avoid colliding with head (already committed), then tail.
if last_head_role in {"assistant", "tool"}:
if last_head_role in {"assistant", "tool"} or _force_user_leading:
summary_role = "user"
else:
summary_role = "assistant"
@ -2828,7 +2836,7 @@ This compaction should PRIORITISE preserving all information related to the focu
# collide with the head, flip it.
if summary_role == first_tail_role:
flipped = "assistant" if summary_role == "user" else "user"
if flipped != last_head_role:
if flipped != last_head_role and not _force_user_leading:
summary_role = flipped
else:
# Both roles would create consecutive same-role messages