diff --git a/apps/x/packages/core/src/knowledge/note_creation.ts b/apps/x/packages/core/src/knowledge/note_creation.ts
index 26901b9e..5426d9a5 100644
--- a/apps/x/packages/core/src/knowledge/note_creation.ts
+++ b/apps/x/packages/core/src/knowledge/note_creation.ts
@@ -48,6 +48,7 @@ You are a memory agent. You are given one or more source files (emails, meeting
 7. **Detect state changes (status updates, resolved items, role changes)**
 8. Create new notes or update existing notes
 9. **Apply state changes to existing notes**
+10. **Maintain assistant-facing notes for every canonical note you create or update**
 
 The core rule: **Meetings and voice memos can create notes freely. Emails require personalized content — and a new People/Organization note from an email also requires the user to have replied at least once in the thread (the Email Reply Gate). Slack and connected-tool artifacts can update existing notes when they carry clear state changes, decisions, commitments, or project facts; they should create new notes only when the artifact clearly identifies a durable person, organization, project, or topic worth tracking.**
 
@@ -977,6 +978,38 @@ One line summarizing this source's relevance to the entity:
 **2025-01-15** (email): Sarah shared the contract draft.
 \`\`\`
 
+## Assistant Notes
+
+Every canonical People, Organizations, Projects, or Topics note you create or update must include a bottom section:
+
+\`\`\`markdown
+## Assistant notes
+- [2026-02-03T14:25:00.000Z] Prefers concise technical detail before pricing discussion.
+\`\`\`
+
+These notes are for future assistant context, not for user-facing summaries.
+
+**Rules:**
+- Add assistant note lines only when the source contains durable, entity-specific context worth preserving for future assistant use.
+- Add one line for a single clear observation; add more only when there are multiple distinct durable observations.
+- Do not add filler. If the source has no useful entity-specific observation beyond what the activity entry already captures, ensure the section exists but leave it without a new bullet.
+- Use the current ISO timestamp from the Context section, not just the source date.
+- Keep each line concise and specific: one durable observation about who or what the note is about.
+- For people, capture subtle useful context when evidenced: working style, preferences, role changes, current company, interests, constraints, or relationship context.
+- For organizations, capture useful context about relationship status, decision process, interests, constraints, or how they prefer to work.
+- For projects and topics, capture current state, constraints, recurring patterns, or what the assistant should remember when helping with that project/topic.
+- Prefer useful but non-obvious observations over restating the activity entry.
+- Do not add guesses.
+- If the note already has \`## Assistant notes\`, append new lines at the top of that section so it is reverse chronological.
+- If the note lacks \`## Assistant notes\`, add the section at the very bottom.
+- Deduplicate within the section: do not add the same observation again if an equivalent line already exists; refresh or update the timestamp only when the source reconfirms the same durable observation.
+- Do not put user-wide preferences here; those belong in \`knowledge/Agent Notes/\`. This section is scoped to the entity note itself.
+
+**Examples:**
+- \`- [2026-02-03T14:25:00.000Z] Sarah prefers pricing options framed with implementation risk called out explicitly.\`
+- \`- [2026-02-03T14:25:00.000Z] Rahul just joined Acme as VP Engineering and is still learning their vendor review process.\`
+- \`- [2026-02-03T14:25:00.000Z] Acme's team tends to route security questions through procurement before engineering review.\`
+
 ---
 
 # Step 7: Detect State Changes
@@ -1131,11 +1164,13 @@ If you discovered new name variants during resolution, add them to Aliases field
 
 - **Always use absolute paths** with format \`[[Folder/Name]]\` for all links
 - Use YYYY-MM-DD format for dates
+- Use ISO timestamp format for assistant notes
 - Be concise: one line per activity entry
 - Note state changes with \`[Field → value]\` in activity
 - Escape quotes properly in shell commands
 - Write only one file per response (notes and \`suggested-topics.md\` follow the same rule)
 - **Always set \`Last update\`** in the Info section to the YYYY-MM-DD date of the source email or meeting. When updating an existing note, update this field to the new source event's date.
+- **Keep \`## Assistant notes\` at the very bottom** for canonical People, Organizations, Projects, or Topics notes, and update it only when there is durable entity-specific context worth preserving.
 - Keep \`suggested-topics.md\` curated, deduped, and capped to the strongest 8-12 cards
 
 ---
@@ -1248,6 +1283,7 @@ Before completing, verify:
 - [ ] Key facts are substantive (no filler)
 - [ ] Open items are commitments/next steps only
 - [ ] Empty sections left empty rather than filled with placeholders
+- [ ] Canonical entity notes keep \`## Assistant notes\` at the bottom, with new timestamped lines only for durable entity-specific context
 
 **State Changes:**
 - [ ] Detected project status changes
diff --git a/apps/x/packages/core/src/knowledge/note_system.ts b/apps/x/packages/core/src/knowledge/note_system.ts
index b7becb3f..5be31161 100644
--- a/apps/x/packages/core/src/knowledge/note_system.ts
+++ b/apps/x/packages/core/src/knowledge/note_system.ts
@@ -40,7 +40,10 @@ const DEFAULT_NOTE_TYPE_DEFINITIONS: NoteTypeDefinition[] = [
 {Substantive facts only. Leave empty if none.}
 
 ## Open items
-{Commitments and next steps only. Leave empty if none.}`,
+{Commitments and next steps only. Leave empty if none.}
+
+## Assistant notes
+- [{ISO_TIMESTAMP}] {One concise assistant-facing observation about this person.}`,
     extractionGuide:
       "Look for: name, role, organization, email, aliases, relationship context",
   },
@@ -77,7 +80,10 @@ const DEFAULT_NOTE_TYPE_DEFINITIONS: NoteTypeDefinition[] = [
 {Substantive facts only. Leave empty if none.}
 
 ## Open items
-{Commitments and next steps only. Leave empty if none.}`,
+{Commitments and next steps only. Leave empty if none.}
+
+## Assistant notes
+- [{ISO_TIMESTAMP}] {One concise assistant-facing observation about this organization.}`,
     extractionGuide:
       "Look for: organization name, type, industry, relationship, domain, key people, projects",
   },
@@ -116,7 +122,10 @@ const DEFAULT_NOTE_TYPE_DEFINITIONS: NoteTypeDefinition[] = [
 {Commitments and next steps only. Leave empty if none.}
 
 ## Key facts
-{Substantive facts only. Leave empty if none.}`,
+{Substantive facts only. Leave empty if none.}
+
+## Assistant notes
+- [{ISO_TIMESTAMP}] {One concise assistant-facing observation about this project.}`,
     extractionGuide:
       "Look for: project name, type, status, people involved, organizations, timeline, decisions",
   },
@@ -149,7 +158,10 @@ const DEFAULT_NOTE_TYPE_DEFINITIONS: NoteTypeDefinition[] = [
 {Commitments and next steps only. Leave empty if none.}
 
 ## Key facts
-{Substantive facts only. Leave empty if none.}`,
+{Substantive facts only. Leave empty if none.}
+
+## Assistant notes
+- [{ISO_TIMESTAMP}] {One concise assistant-facing observation about this topic.}`,
     extractionGuide:
       "Look for: topic name, keywords, related people/orgs/projects, decisions, key facts",
   },
@@ -199,11 +211,39 @@ export function getNoteTypeDefinitions(): NoteTypeDefinition[] {
 
 // ── Render helper ────────────────────────────────────────────────────────
 
+function assistantNotesPlaceholder(type: string): string {
+  const normalized = type.toLowerCase();
+  if (normalized === "people") {
+    return "person";
+  }
+  if (normalized === "organizations") {
+    return "organization";
+  }
+  if (normalized === "projects") {
+    return "project";
+  }
+  if (normalized === "topics") {
+    return "topic";
+  }
+  return "entity";
+}
+
+function renderTemplateWithAssistantNotes(def: NoteTypeDefinition): string {
+  if (!["People", "Organizations", "Projects", "Topics"].includes(def.type)) {
+    return def.template;
+  }
+  if (/^## Assistant notes\b/im.test(def.template)) {
+    return def.template;
+  }
+  const target = assistantNotesPlaceholder(def.type);
+  return `${def.template.trimEnd()}\n\n## Assistant notes\n- [{ISO_TIMESTAMP}] {One concise assistant-facing observation about this ${target}.}`;
+}
+
 export function renderNoteTypesBlock(): string {
   const defs = getNoteTypeDefinitions();
   const sections = defs.map(
     (d) =>
-      `## ${d.type}\n\`\`\`markdown\n${d.template}\n\`\`\``,
+      `## ${d.type}\n\`\`\`markdown\n${renderTemplateWithAssistantNotes(d)}\n\`\`\``,
   );
   return `# Note Templates\n\n${sections.join("\n\n")}`;
 }