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 Aquifer-sea/pattern8 --skill feature_devgit clone --depth 1 https://github.com/Aquifer-sea/pattern8Wrote 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/aquifer-sea/pattern8/feature_dev)<a href="https://agentmods.dev/skills/aquifer-sea/pattern8/feature_dev"><img src="https://agentmods.dev/badge/skills/aquifer-sea/pattern8/feature_dev.svg" alt="Measured on agentmods" 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 | $0.00023 | $0.00317 |
| Opus 5 | $0.00012 | $0.00159 |
| Sonnet 5 | $0.00005 | $0.00063 |
| Haiku 4.5 | $0.00002 | $0.00032 |
Grade A, and why
feature_dev 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 7d 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
Feature Development
Constrains the Agent to follow "understand requirements → technical design → write code → self-test" structured process.
Step 1: Inversion (Requirements Alignment)
Before starting development, you must check every item in assets/checklist.yaml.
Step 2: Generator (Generate Development Plan + Code from Template)
Your output must strictly follow the format in assets/template.yaml.
Must include: requirement understanding, technical design, implementation code, test code, integration notes.
Step 3: Tool Wrapper (Security Fence)
Commands executed during development must be checked against references/security.yaml.
Do not introduce dependencies with known vulnerabilities or bypass authentication mechanisms.
Step 4: Reviewer (Self-Audit Loop)
Audit your development output against references/guidelines.yaml.
Key checks: does it match acceptance criteria? Are there tests? Is it backward compatible?
Roll back and regenerate if non-compliant, up to 3 retries.
What ships with it
4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 7d ago First seen · 45 lines · 23 tokens per session scan A a834b12ebdef
feature_dev is a skill published in the GitHub repository Aquifer-sea/pattern8 (49 stars, last pushed 5mo ago), licensed MIT. It adds 23 tokens to every session and 317 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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