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fix(agent): prevent silent tool result loss during context compression (#1993)

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_align_boundary_backward only checked messages[idx-1] to decide if
the compress-end boundary splits a tool_call/result group. When an
assistant issues 3+ parallel tool calls, their results span multiple
consecutive messages. If the boundary fell in the middle of that group,
the parent assistant was summarized away and orphaned tool results were
silently deleted by _sanitize_tool_pairs.

Now walks backward through all consecutive tool results to find the
parent assistant, then pulls the boundary before the entire group.

6 regression tests added in tests/test_compression_boundary.py.

Co-authored-by: Guts <Gutslabs@users.noreply.github.com>
This commit is contained in:
Teknium
2026-03-18 15:22:51 -07:00
committed by GitHub
parent 22f41daded
commit d132e344d7
2 changed files with 214 additions and 9 deletions
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24
agent/context_compressor.py
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@@ -253,18 +253,24 @@ Write only the summary body. Do not include any preamble or prefix; the system w
"""Pull a compress-end boundary backward to avoid splitting a
tool_call / result group.
If the message just before ``idx`` is an assistant message with
tool_calls, those tool results will start at ``idx`` and would be
separated from their parent. Move backwards to include the whole
group in the summarised region.
If the boundary falls in the middle of a tool-result group (i.e.
there are consecutive tool messages before ``idx``), walk backward
past all of them to find the parent assistant message. If found,
move the boundary before the assistant so the entire
assistant + tool_results group is included in the summarised region
rather than being split (which causes silent data loss when
``_sanitize_tool_pairs`` removes the orphaned tail results).
"""
if idx <= 0 or idx >= len(messages):
return idx
prev = messages[idx - 1]
if prev.get("role") == "assistant" and prev.get("tool_calls"):
# The results for this assistant turn sit at idx..idx+k.
# Include the assistant message in the summarised region too.
idx -= 1
# Walk backward past consecutive tool results
check = idx - 1
while check >= 0 and messages[check].get("role") == "tool":
check -= 1
# If we landed on the parent assistant with tool_calls, pull the
# boundary before it so the whole group gets summarised together.
if check >= 0 and messages[check].get("role") == "assistant" and messages[check].get("tool_calls"):
idx = check
return idx
def compress(self, messages: List[Dict[str, Any]], current_tokens: int = None) -> List[Dict[str, Any]]: