diff --git a/agent/prompt_builder.py b/agent/prompt_builder.py
index f6e53b5b187..f1c5ab0890a 100644
--- a/agent/prompt_builder.py
+++ b/agent/prompt_builder.py
@@ -281,14 +281,20 @@ def build_memory_guidance(memory_enabled: bool = True, profile_enabled: bool = T
             "disabled, so never target='memory'. "
         )
     return frame + (
-        "Save proactively — storage has a hard character budget, and when "
-        "it fills, replace or consolidate stale entries in the same batch "
+        "Skills come first: when you learn something while doing a task — a "
+        "procedure, a pitfall, and the user's preferences and corrections "
+        "for that kind of work — record it in the skill you used or built "
+        "for the task (skill_manage), where it loads only when relevant. "
+        "Memory is the narrow exception for facts that apply to EVERY "
+        "session regardless of task (who the user is, environment facts, "
+        "standing conventions with no task home); it has a hard character "
+        "budget, so when it fills, replace or consolidate stale entries "
         "rather than skipping the save. Write entries as declarative facts, "
         "not instructions to yourself: 'User prefers concise responses' ✓ — "
         "'Always respond concisely' ✗ (imperative phrasing gets re-read as "
         "a directive in later sessions and can override the user's current "
-        "request). Route by longevity: a fact stale within a week belongs "
-        "in session history; procedures and workflows belong in skills."
+        "request). A fact stale within a week belongs in session history; "
+        "procedures and workflows belong in skills."
     )
 
 
diff --git a/tests/agent/test_prompt_builder.py b/tests/agent/test_prompt_builder.py
index 6b4190f8415..4331c2bc9d2 100644
--- a/tests/agent/test_prompt_builder.py
+++ b/tests/agent/test_prompt_builder.py
@@ -70,7 +70,12 @@ class TestGuidanceConstants:
         assert "declarative facts" in MEMORY_GUIDANCE
         assert "imperative phrasing" in MEMORY_GUIDANCE
         assert "stale within a week" in MEMORY_GUIDANCE
-        assert "Save proactively" in MEMORY_GUIDANCE  # positive posture leads
+        # Skills are the default home for task-learned knowledge (incl. the
+        # user's preferences/corrections for that work); memory is the narrow
+        # every-session exception. The routing rule must LEAD, not trail.
+        assert MEMORY_GUIDANCE.index("Skills come first") < MEMORY_GUIDANCE.index("Memory is the narrow exception")
+        assert "preferences and corrections" in MEMORY_GUIDANCE
+        assert "Save proactively" not in MEMORY_GUIDANCE
         assert "workflows belong" in MEMORY_GUIDANCE
         # The category/SKIP curricula must NOT be re-taught here.
         assert "PR numbers" not in MEMORY_GUIDANCE
diff --git a/tools/memory_tool.py b/tools/memory_tool.py
index 54dcaa71a62..eccbe82674f 100644
--- a/tools/memory_tool.py
+++ b/tools/memory_tool.py
@@ -1271,10 +1271,12 @@ MEMORY_SCHEMA = {
         "reports current/limit chars and confirms completion; one batch call finishes the "
         "update, so don't repeat it. Use the bare action/content/old_text fields only for a "
         "single lone change.\n\n"
-        "WHEN: save proactively when the user states a preference, correction, or personal "
-        "detail, or you learn a stable fact about their environment, conventions, or workflow. "
-        "Priority: user preferences & corrections > environment facts > procedures. The best "
-        "memory stops the user repeating themselves.\n\n"
+        "WHEN: only for facts that apply to EVERY session regardless of task: who the user "
+        "is, stable environment facts, standing conventions with no task home. Anything "
+        "learned while doing a task (procedures, pitfalls, and the user's preferences and "
+        "corrections for that kind of work) belongs in the task's skill via skill_manage, "
+        "where it loads only when relevant; memory is injected into every turn and must "
+        "stay small.\n\n"
         "IF FULL: an add is rejected with the current entries shown. Reissue as ONE batch that "
         "removes or shortens enough stale entries and adds the new one together.\n\n"
         "TARGETS: 'user' = who the user is (name, role, preferences, style). 'memory' = your "