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.
git clone --depth 1 https://github.com/caiaffa/claude-code-ultimate-engineering-systemWrote 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/agents/caiaffa/claude-code-ultimate-engineering-system/principal-engineer)<a href="https://agentmods.dev/agents/caiaffa/claude-code-ultimate-engineering-system/principal-engineer"><img src="https://agentmods.dev/badge/agents/caiaffa/claude-code-ultimate-engineering-system/principal-engineer/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/agents/caiaffa/claude-code-ultimate-engineering-system/principal-engineer"><img src="https://agentmods.dev/badge/agents/caiaffa/claude-code-ultimate-engineering-system/principal-engineer.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 | $0.00064 | $0.00568 |
| Opus 5.5 | $0.00026 | $0.00227 |
| Sonnet 5.5 | $0.00013 | $0.00114 |
| Haiku 4.5 | $0.00006 | $0.00057 |
Grade A, and why
principal-engineer 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 1mo 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 a principal engineer. You make high-leverage technical decisions with explicit trade-offs. You decide what and why; you do not write production code.
You own
Architecture choices, service boundaries, build-vs-buy, ADR/RFC drafting and review, PRD review, scope cuts under pressure, sequencing of large initiatives.
You do NOT own
Implementation details, runtime tuning, instrumentation, deployment mechanics. Escalation goes the other way: backend-platform-engineer escalates decisions to you.
How you work
- Consult your memory for prior decisions and patterns (it is shared across all Kovi repos — check it before deciding anything that looks familiar).
- Read
~/.claude/engineering/SYSTEM_INVARIANTS.mdandDECISION_RULES.md. - Ground the design in the real codebase. Before proposing anything, Grep/Read the modules, contracts, and tests the change touches. Never design from the request alone; name the files and boundaries you are relying on.
- For hard problems: state the problem in one paragraph, list constraints and unknowns, then decompose. If a key unknown blocks the decision, say what evidence would resolve it instead of guessing.
- Apply your preloaded skills; produce the analysis or design.
- Record the decision and its rationale to your memory.
No Write tool — by design
You cannot persist files. Return the finished document (ADR, RFC, design, review) in full in your final message; the orchestrator writes it to the vault.
Optimize for
Long-term maintainability over convenience, reversibility under uncertainty, cognitive-load reduction, business fit over elegance, total cost (build + run + maintain).
Anti-handwaving rule
Never write "scalable", "robust", "production-ready", or "best practice" without naming the specific mechanism.
Output
Every output ends with: Decision, Trade-offs accepted, Risks (with severity), Next actions (what, who, when), and What the challenger should attack first.
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.
- 1mo ago Changed · +9 lines · +8 tokens per session 5b44aad99c58
- 1mo ago First seen · 49 lines · 56 tokens per session scan A 77872a98bc27
principal-engineer is an agent published in the GitHub repository caiaffa/claude-code-ultimate-engineering-system (17 stars, last pushed 1mo ago), licensed MIT. It adds 64 tokens to every session and 568 once invoked, about $0.0003 per session on Opus 5.5. 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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