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 skills add DavidVujic/my-eca-config --skill fp-idiomatic-stylegit clone --depth 1 https://github.com/DavidVujic/my-eca-configWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/davidvujic/my-eca-config/fp-idiomatic-style)<a href="https://agentmods.dev/skills/davidvujic/my-eca-config/fp-idiomatic-style"><img src="https://agentmods.dev/badge/skills/davidvujic/my-eca-config/fp-idiomatic-style/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/davidvujic/my-eca-config/fp-idiomatic-style"><img src="https://agentmods.dev/badge/skills/davidvujic/my-eca-config/fp-idiomatic-style.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What 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 5.1 | $0.00048 | $0.00378 |
| Opus 5 | $0.00024 | $0.00189 |
| Sonnet 5 | $0.00010 | $0.00076 |
| Haiku 4.5 | $0.00005 | $0.00038 |
Grade A, and why
fp-idiomatic-style 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 11d 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
Functional-leaning, idiomatic coding style policy
Applies whenever you write new code OR propose code changes, in any language.
Priorities (in order)
- Correctness and clarity first.
- Idiomatic for the target language (e.g., Pythonic for Python, idiomatic TS for TypeScript).
- Functional-leaning style when it fits naturally:
- explicit inputs/outputs
- minimize side effects and shared mutable state
- small composable functions
- declarative transformations over imperative loops where readable
Data modeling preference (important)
- Prefer lightweight structures for transient data over heavy class/schema abstractions.
- Only introduce richer types when clearly beneficial, e.g.:
- validation/invariants are required
- long-lived domain objects
- meaningful behavior/methods beyond data transport
Language examples
- Python: prefer
dict/Mapping/tuples; avoiddataclassesorpydanticmodels unless justified. - TypeScript: prefer plain objects, interfaces, or type aliases; avoid classes unless justified.
- Other languages: follow the same principle — reach for the lightest idiomatic container first.
Don't force FP purity
- Avoid clever chaining, excessive
map/filter, or recursion if it reduces readability. - Choose the most readable idiomatic solution, then make it functional-leaning where it remains clear.
When editing existing code
- Prefer the smallest change that satisfies requirements.
- Preserve local conventions unless they conflict with correctness/security.
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.
- 11d ago First seen · 38 lines · 48 tokens per session scan A 4aec007449e1
fp-idiomatic-style is a skill published in the GitHub repository DavidVujic/my-eca-config (11 stars, last pushed 13d ago), licensed MIT. It adds 48 tokens to every session and 378 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 2026-08-30.
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