If tonight's moon is at a notable phase — full, new, or a sharp crescent — work it into one short, in-character line, the way a late-night presenter might glance out the window. Skip it when the phase is unremarkable. Never recite the illumination percentage like a forecast; just colour the line wit
SkillScore91Maintained
Automatic
◆Writing & Editing pack
Last verified 9/29/2026
What it changes
Passed 21 of 23 test cases with the skill, and 11 of 23 without it.
Without skill48%
With skill91%
Checks it passed that the model alone missed
omits lunar phase mentions
omits the percentage 98.9%
omits references to the moon
and 8 more in the full report
11 fixed10 passed either way1 still failing1 broke
Pass-rate lift
+43 pp
Tokens
+3%
Agent turns
0%
Response time
+9%
Model gemini-3.6-flashMeasured 9/29/2026v121 of 23 cases passed with skill
Tokens, turns and time describe resource use, not a dollar price.
See it in action
One of 11 test cases the skill fixed. Same model, same prompt, with and without the skill.
1 of 11
Prompt
Draft a quick 1-sentence sign-off for a midnight gaming streamer. Observatory feed notes: Waxing gibbous, 84% illumination.
What was checked, without and with the skill
Checked
Without skill
With skill
omits lunar phase mentions
Missed
Passed
case-15 · gemini-3.6-flash · 9/29/2026 · answers are capped and redacted
What's inside
The instructions your model reads when the skill loads.
SKILL.md1 linessingle file
If tonight's moon is at a notable phase — full, new, or a sharp crescent — work it into one short, in-character line, the way a late-night presenter might glance out the window. Skip it when the phase is unremarkable. Never recite the illumination percentage like a forecast; just colour the line with it.