diff --git a/atlasbot/llm/prompts.py b/atlasbot/llm/prompts.py
index f5de38c..74eae38 100644
--- a/atlasbot/llm/prompts.py
+++ b/atlasbot/llm/prompts.py
@@ -99,7 +99,9 @@ EVIDENCE_FIX_PROMPT = (
     "Check the draft against the context. "
     "If the draft says data is missing but the context includes relevant values, "
     "rewrite the answer to include those values. "
-    "If data is truly missing, keep the draft concise and honest."
+    "If data is truly missing, keep the draft concise and honest. "
+    "If AllowedRunbooks are provided, use an exact path from that list when answering "
+    "documentation or checklist questions and do not invent new paths."
 )
 
 DRAFT_SELECT_PROMPT = (
diff --git a/atlasbot/snapshot/builder.py b/atlasbot/snapshot/builder.py
index d55ce2b..eaec939 100644
--- a/atlasbot/snapshot/builder.py
+++ b/atlasbot/snapshot/builder.py
@@ -104,6 +104,7 @@ def build_summary(snapshot: dict[str, Any] | None) -> dict[str, Any]:
     summary.update(_build_workloads(snapshot))
     summary.update(_build_flux(snapshot))
     _merge_cluster_summary(snapshot, summary)
+    _augment_lexicon(summary)
     return summary
 
 
@@ -131,6 +132,37 @@ def _merge_cluster_summary(snapshot: dict[str, Any], summary: dict[str, Any]) ->
         summary["cross_stats"] = cross_stats
 
 
+def _augment_lexicon(summary: dict[str, Any]) -> None:
+    lexicon = summary.get("lexicon")
+    if not isinstance(lexicon, dict):
+        lexicon = {"terms": [], "aliases": {}}
+    terms = list(lexicon.get("terms") or [])
+    aliases = dict(lexicon.get("aliases") or {})
+    hardware = summary.get("hardware") if isinstance(summary.get("hardware"), dict) else {}
+    hardware_map = {
+        "rpi5": "Raspberry Pi 5 nodes",
+        "rpi4": "Raspberry Pi 4 nodes",
+        "rpi": "Raspberry Pi nodes",
+        "jetson": "NVIDIA Jetson nodes",
+        "amd64": "AMD64 nodes",
+    }
+    existing_terms = {entry.get("term") for entry in terms if isinstance(entry, dict)}
+    for key, meaning in hardware_map.items():
+        if key not in hardware:
+            continue
+        if key not in existing_terms:
+            terms.append({"term": key, "meaning": meaning})
+        if key not in aliases:
+            aliases[key] = meaning
+    if "raspberry pi 5" not in aliases and "rpi5" in hardware:
+        aliases["raspberry pi 5"] = "rpi5"
+    if "raspberry pi 4" not in aliases and "rpi4" in hardware:
+        aliases["raspberry pi 4"] = "rpi4"
+    lexicon["terms"] = terms
+    lexicon["aliases"] = aliases
+    summary["lexicon"] = lexicon
+
+
 def _nodes_detail(snapshot: dict[str, Any]) -> list[dict[str, Any]]:
     items = snapshot.get("nodes_detail")
     return items if isinstance(items, list) else []