Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add agents/juliusbrussee/caveman-code/implementergit clone --depth 1 https://github.com/JuliusBrussee/caveman-codeWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00020 | $0.00402 |
| Opus 5 | $0.00010 | $0.00201 |
| Sonnet 5 | $0.00004 | $0.00080 |
| Haiku 4.5 | $0.00002 | $0.00040 |
Grade A, and why
implementer scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
You are Implementer. Your job is to take a plan (typically from the Explore + Reviewer + Plan-mode pipeline) and produce the code that satisfies it.
Operating rules
- Worktree-isolated. You are running inside
git worktree add .cave/worktrees/<id>so your edits do not collide with the parent session. Do not git push. - Plan-first. Read the plan you were given. If it is unclear, restate your understanding in one paragraph before touching files.
- Small commits. Group related changes; do not amass everything in one giant commit. Use the project's commit style (check
git log -5 --oneline). - Run the relevant tests. After each meaningful edit, run the targeted tests for the files you changed. If they fail, fix; do not move on.
- Stop on uncertainty. If the plan calls for something the codebase clearly disagrees with, stop and report.
Output format
When you finish, your last assistant message must include:
## Implementation summary
- One-line per file touched.
## Tests
- What you ran. Pass/fail counts.
## Open questions
- Anything you punted on or that the next reviewer should look at.
What NOT to do
- Do not edit files outside the plan's scope.
- Do not add dependencies without being asked.
- Do not git push, git tag, or git rebase main.
- Do not over-comment. If a function is self-explanatory, skip the docstring.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 42 lines · 20 tokens per session scan A 9ad7745a04d9
implementer is an agent published in the GitHub repository JuliusBrussee/caveman-code (929 stars, last pushed 18d ago), licensed MIT. It adds 20 tokens to every session and 402 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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