diff --git a/scripts/claude-profile b/scripts/claude-profile
index 12c954f..120a6f5 100755
--- a/scripts/claude-profile
+++ b/scripts/claude-profile
@@ -378,6 +378,11 @@ combined_context="${context}
 
 ${body}"
 
+ctx_kb=$(( ${#combined_context} / 1024 ))
+if (( ${#combined_context} > 150000 )); then
+    echo "Warning: context is ${ctx_kb}KB — large projects may benefit from trimming CONTEXT.md or MEMORY.md" >&2
+fi
+
 if (( DRYRUN )); then
     dryrun_log "Profile:         $PROFILE ($target)"
     dryrun_log "Mode:            $MODE"
@@ -396,11 +401,11 @@ if (( DRYRUN )); then
     dryrun_log "Would write:     $target/active-mode.env"
     dryrun_log "Would write:     $target/last-mode"
     if (( ${#CLAUDE_ARGS[@]} > 0 )); then
-        dryrun_log "Would execute:   claude --model $MODEL_ID --append-system-prompt <context+mode> ${CLAUDE_ARGS[*]}"
+        dryrun_log "Would execute:   claude --model $MODEL_ID --append-system-prompt-file <tmpfile> ${CLAUDE_ARGS[*]}"
     else
-        dryrun_log "Would execute:   claude --model $MODEL_ID --append-system-prompt <context+mode>"
+        dryrun_log "Would execute:   claude --model $MODEL_ID --append-system-prompt-file <tmpfile>"
     fi
-    dryrun_log "Context length:  ${#combined_context} chars (${#context} from context-load + ${#body} from mode body)"
+    dryrun_log "Context length:  ${#combined_context} chars (~${ctx_kb}KB; ${#context} from context-load + ${#body} from mode body)"
     dryrun_log "No changes made."
     exit 0
 fi
@@ -433,5 +438,13 @@ done
 printf '%s\n' "$active_env" > "$target/active-mode.env"
 printf '%s\n' "$MODE" > "$target/last-mode"
 
-echo "Launching: $PROFILE / $MODE${PROJECT:+ / $PROJECT}"
-exec claude --model "$MODEL_ID" --append-system-prompt "$combined_context" "${CLAUDE_ARGS[@]}"
+# Write context to a temp file — passing it inline as an argument hits ARG_MAX
+# on large projects (context-load output can exceed 2 MB).
+# Dropping exec (→ subprocess) means the EXIT trap fires after claude exits,
+# which properly resets the WezTerm theme and cleans up the temp file.
+context_file=$(mktemp /tmp/claude-profile-ctx-XXXXXX.md)
+printf '%s\n' "$combined_context" > "$context_file"
+trap 'rm -f "${context_file:-}"; reset_wezterm_profile' EXIT
+
+echo "Launching: $PROFILE / $MODE${PROJECT:+ / $PROJECT} (context: ${ctx_kb}KB)"
+claude --model "$MODEL_ID" --append-system-prompt-file "$context_file" "${CLAUDE_ARGS[@]}"