diff --git a/codex_context.yaml b/codex_context.yaml
index eac20ae..aaba8ba 100644
--- a/codex_context.yaml
+++ b/codex_context.yaml
@@ -99,6 +99,7 @@ SESSION_STATE:
     D39: "Shared context bootstrap update 2026-05-03: start-codex.sh now runs from repo root, prints that it is loading ./codex_context.yaml, and injects the required initial instruction 'Before doing any task, read codex_context.yaml and treat it as shared project memory.' before existing SESSION_STATE bootstrap content."
     D40: "Created ./start-aider.sh and ./update-context.md on 2026-05-03. start-aider.sh runs from repo root, defaults OLLAMA_API_BASE to http://100.100.231.104:11434, uses model ollama/deepseek-coder:latest, and attaches ./codex_context.yaml via aider --read after confirming read-only support from local aider help. update-context.md documents shared context rules for Codex and Aider; scripts set executable."
     D41: "Startup 2026-05-03: read existing ./codex_context.yaml before task work, verified parity with user-provided SESSION_STATE, retained state, overwrote file."
+    D42: "Aider is installed as a local coding assistant, but current local Ollama models are not reliable enough for context-file editing."
   todos:
     T1: "For all future meaningful changes/decisions, update and overwrite ./codex_context.yaml."
     T2: "DONE: Commit current changes."
@@ -123,6 +124,7 @@ SESSION_STATE:
     T21: "DONE: Commit deploy escalation output changes."
     T22: "DONE: Retry Aider setup on remaining hosts using corrected SSH targets pi@piha and ubuntu-4gb-hel1-1; both verified at aider 0.86.2."
     T23: "DONE: Add shared Codex/Aider context bootstrap scripts and update-context protocol doc."
+    T24: "Use Codex for codex_context.yaml updates; use Aider only for simple code edits until a better local model/edit format is validated."
   issues:
     I1: "Tailscale DNS health warning: configured DNS servers unreachable."
     I2: "Preferred gateway path unavailable: 100.108.208.3:8080 connection failed."