diff --git a/.codex/AGENTS.md b/.codex/AGENTS.md
index 58706bae..b2151118 100644
--- a/.codex/AGENTS.md
+++ b/.codex/AGENTS.md
@@ -120,6 +120,12 @@ Before starting work, scan recent sessions (7 days) to avoid conflicts and reuse
 - Overlapping file scope → warn, suggest referencing prior session
 - Complementary findings → feed into current task context
 
+### Session Memory (`core_memory`)
+
+- `core_memory` (MCP) stores session snapshots as `CMEM-*` records — use `/compact` to save, `core_memory export` to restore
+- Query prior memories before complex tasks: `core_memory({ operation: "search", query: "..." })`
+- `.workflow/` artifacts are session-specific; `core_memory` is cross-session — reference session IDs, don't duplicate
+
 ## Execution Checklist
 
 **Before**: