diff --git a/atlasbot/engine/answerer.py b/atlasbot/engine/answerer.py
index bdbd511..ea72cec 100644
--- a/atlasbot/engine/answerer.py
+++ b/atlasbot/engine/answerer.py
@@ -77,6 +77,8 @@ class ModePlan:
     chunk_lines: int
     chunk_top: int
     chunk_group: int
+    kb_max_chars: int
+    kb_max_files: int
     parallelism: int
     score_retries: int
     use_deep_retrieval: bool
@@ -335,7 +337,7 @@ class AnswerEngine:
                 if observer:
                     observer("retrieve", "scoring chunks")
                 chunks = _chunk_lines(summary_lines, plan.chunk_lines)
-                kb_lines = self._kb.chunk_lines() if self._kb else []
+                kb_lines = self._kb.chunk_lines(max_files=plan.kb_max_files, max_chars=plan.kb_max_chars) if self._kb else []
                 if kb_lines:
                     kb_chunks = _chunk_lines(kb_lines, plan.chunk_lines)
                     for idx, chunk in enumerate(kb_chunks):
@@ -1135,6 +1137,8 @@ def _mode_plan(settings: Settings, mode: str) -> ModePlan:
             chunk_lines=6,
             chunk_top=10,
             chunk_group=4,
+            kb_max_chars=5000,
+            kb_max_files=18,
             parallelism=4,
             score_retries=3,
             use_deep_retrieval=True,
@@ -1154,6 +1158,8 @@ def _mode_plan(settings: Settings, mode: str) -> ModePlan:
             chunk_lines=8,
             chunk_top=8,
             chunk_group=4,
+            kb_max_chars=3000,
+            kb_max_files=12,
             parallelism=2,
             score_retries=2,
             use_deep_retrieval=True,
@@ -1172,6 +1178,8 @@ def _mode_plan(settings: Settings, mode: str) -> ModePlan:
         chunk_lines=12,
         chunk_top=5,
         chunk_group=5,
+        kb_max_chars=1200,
+        kb_max_files=6,
         parallelism=1,
         score_retries=1,
         use_deep_retrieval=False,