diff --git a/tests/quickshell/agent-usage-contract b/tests/quickshell/agent-usage-contract
index e0baa82..eacde6e 100755
--- a/tests/quickshell/agent-usage-contract
+++ b/tests/quickshell/agent-usage-contract
@@ -355,13 +355,17 @@ for line in sys.stdin:
 STUB
 chmod +x "$stub/codex"
 
-mkdir -p "$work/codex/sessions/2026/08/25"
-cat >"$work/codex/sessions/2026/08/25/session.jsonl" <<'JSONL'
-{"type":"turn_context","payload":{"model":"gpt-5.6-sol"}}
-{"type":"token_count","timestamp":"2026-08-25T10:00:00Z","payload":{"type":"token_count","info":{"total_token_usage":{"input_tokens":999999,"output_tokens":999999},"last_token_usage":{"input_tokens":1200,"cached_input_tokens":1000,"output_tokens":300}}}}
-{"type":"token_count","timestamp":"2026-08-25T10:05:00Z","payload":{"type":"token_count","info":{"total_token_usage":{"input_tokens":1999999,"output_tokens":1999999},"last_token_usage":{"input_tokens":1200,"cached_input_tokens":1000,"output_tokens":300}}}}
-JSONL
-touch "$work/codex/sessions/2026/08/25/session.jsonl"
+session_day="$(date +%Y/%m/%d)"
+session_date="$(date +%Y-%m-%d)"
+session_offset="$(date +%:z)"
+mkdir -p "$work/codex/sessions/$session_day"
+{
+    printf '%s\n' '{"type":"turn_context","payload":{"model":"gpt-5.6-sol"}}'
+    jq -nc --arg timestamp "${session_date}T10:00:00${session_offset}" \
+        '{type:"token_count",timestamp:$timestamp,payload:{type:"token_count",info:{total_token_usage:{input_tokens:999999,output_tokens:999999},last_token_usage:{input_tokens:1200,cached_input_tokens:1000,output_tokens:300}}}}'
+    jq -nc --arg timestamp "${session_date}T10:05:00${session_offset}" \
+        '{type:"token_count",timestamp:$timestamp,payload:{type:"token_count",info:{total_token_usage:{input_tokens:1999999,output_tokens:1999999},last_token_usage:{input_tokens:1200,cached_input_tokens:1000,output_tokens:300}}}}'
+} >"$work/codex/sessions/$session_day/session.jsonl"
 
 codex_record="$(
     PATH="$stub:$PATH" \