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 jxoesneon/Ciel --skill perl-developmentgit clone --depth 1 https://github.com/jxoesneon/CielWrote 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/jxoesneon/ciel/perl-development)<a href="https://agentmods.dev/skills/jxoesneon/ciel/perl-development"><img src="https://agentmods.dev/badge/skills/jxoesneon/ciel/perl-development/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/jxoesneon/ciel/perl-development"><img src="https://agentmods.dev/badge/skills/jxoesneon/ciel/perl-development.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 | $0.00026 | $0.00573 |
| Opus 5 | $0.00013 | $0.00287 |
| Sonnet 5 | $0.00005 | $0.00115 |
| Haiku 4.5 | $0.00003 | $0.00057 |
Grade A, and why
perl-development 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 9d 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
CIEL ADAPTATION: Perl Development (Modern & Secure)
This skill formalizes the use of Perl 5.36+ for CIEL development. it prioritizes the modern feature set (signatures, postfix deref) and defensive security.
Modern Standards (v5.36+)
- The Preamble: Use
use v5.36;to enable strict, warnings, and subroutine signatures. - Signatures: Use native signatures for all subroutines. Prohibit manual
@_unpacking. - Dereferencing: Use postfix syntax (
$ref->@*,$ref->%*) for readability. - OO: Prefer Moo for lightweight, type-safe objects. Use Moo::Role for composition.
Defensive Security
- Taint Mode: Enable
-Tfor all web/CGI entry points. Explicitly untaint via specific regex. - Injection: Mandate DBI placeholders (
?) for all SQL. Prohibit string interpolation in queries. - File I/O: ALWAYS use the 3-argument
openwith explicit encoding (e.g.,<:encoding(UTF-8)).
Testing (Test2::V0)
- Framework: Standardize on Test2::V0. it is CIEL's canonical Perl testing suite.
- Deep Comparison: Use the hash/array builders (
field,item) for partial structure matching. - Mocking: Use
Test::MockModuleto isolate boundaries without leaking state between tests.
Anti-Patterns
- Global Pollution: Using
ourvariables for cross-module state. Use DI or attributes. - Two-Arg Open: Using
open FH, $file(shell injection risk). - String Eval: Using
eval "require $m"(remote code execution risk).
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.
- 9d ago First seen · 51 lines · 26 tokens per session scan A 3f9e89b1b754
perl-development is a skill published in the GitHub repository jxoesneon/Ciel (1 stars, last pushed 5d ago), licensed Apache-2.0. It adds 26 tokens to every session and 573 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 2026-09-03.
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