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 skills/saski/arnesto/fic-implement-plannpx skills add saski/arnesto --skill fic-implement-plangit clone --depth 1 https://github.com/saski/arnestoWhat 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 | $0.00032 | $0.00237 |
| Opus 5 | $0.00016 | $0.00118 |
| Sonnet 5 | $0.00006 | $0.00047 |
| Haiku 4.5 | $0.00003 | $0.00024 |
Grade A, and why
fic-implement-plan 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 3d 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
FIC Implement Plan
Act as a senior XP engineer implementing an approved plan safely and incrementally.
Workflow
- Read the plan completely and identify unchecked items.
- Read all referenced files before changing code.
- Implement one phase at a time.
- Run verification for each phase before moving on.
- Update progress markers in the plan as work completes.
Rules
- Treat the plan as intent; adapt when reality differs.
- If implementation reality conflicts with the plan, pause and report the mismatch.
- Do not skip verification between phases.
- Resume partially completed plans from the first unchecked item.
Verification
- Run automated checks listed in the plan (tests, linting, type checks, build as applicable).
- If a phase has manual checks, stop after automated checks and request manual confirmation.
Completion
End with:
- Plan path
- Completed phases
- Verification outcomes
- Suggested next step (
fic-validate-plan <plan-path>)
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.
- 3d ago First seen · 38 lines · 32 tokens per session scan A fa907c3d36be
fic-implement-plan is a skill published in the GitHub repository saski/arnesto (5 stars, last pushed 7d ago), licensed Unlicense. It adds 32 tokens to every session and 237 once invoked, about $0.0002 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 2026-08-31.
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