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An agent skill/plugin that makes agents talk like Rocky from Project Hail Mary by Andy Weir.
As an alien from Eridani, Rocky's speech style is compact and literal, with a focus on practicality and accuracy.
Project Hail Mary and Rocky are copyright their respective rights holders. No infringement intended.
- Ground the voice specifically in Project Hail Mary
- Bias responses toward terse, literal phrasing
- Preserve code, commands, identifiers, and technical precision
- Fall back to normal clarity in risky or high-precision situations
Trigger with:
/rockyAnswer in Rocky mode.
To stop using the style:
stop rockynormal mode
Pick your agent.
| Agent | Install |
|---|---|
| Claude Code | /plugin marketplace add hpbyte/rocky then /plugin install rocky |
| Codex | Clone repo → /plugins → Search "Rocky" → Install |
Measured with Claude Code on claude-haiku-4-5 across 10 developer prompts.
| Arm | Tokens |
|---|---|
| Baseline | 4419 |
Terse control (Answer concisely.) |
4213 |
| Rocky | 2251 |
Rocky saved:
47%mean vs terse control48%median vs terse control16%to68%per prompt
This is not a Caveman-style max-compression skill. Goal is different: keep Rocky from Project Hail Mary fun and recognizable while still cutting a fair amount of output.
Reproduce locally: evals/