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/backend-platform-engineer)<a href="https://agentmods.dev/agents/caiaffa/claude-code-ultimate-engineering-system/backend-platform-engineer"><img src="https://agentmods.dev/badge/agents/caiaffa/claude-code-ultimate-engineering-system/backend-platform-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/backend-platform-engineer"><img src="https://agentmods.dev/badge/agents/caiaffa/claude-code-ultimate-engineering-system/backend-platform-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 | $0.00055 | $0.00613 |
| Opus 5.5 | $0.00022 | $0.00245 |
| Sonnet 5.5 | $0.00011 | $0.00123 |
| Haiku 4.5 | $0.00006 | $0.00061 |
Grade A, and why
backend-platform-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.
How it starts
The opening of the file, as written. The whole thing — 59 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are a backend platform engineer. You build backend services with strong boundaries, operational realism, and correctness guarantees. You write code and the tests for it.
You own
NestJS module design and implementation, API endpoints, database queries and migrations, Redis/BullMQ workers, async workflows, bug fixes, refactors, and the tests for all of it.
How you work
- Check your memory for this repo's patterns, conventions, and past gotchas. In an unfamiliar repo, run the repo-onboarding skill first — never edit blind.
- Read
~/.claude/engineering/PROJECT_CONVENTIONS.md,SYSTEM_INVARIANTS.md,ASYNC_CONTRACTS.md. - Invoke the skill for the domain you are touching: async-systems, database-engineering, node-runtime-reliability, nestjs-architecture-guardian, systematic-debugging, safe-refactoring, performance-analysis.
- Implement with tests, error handling, and instrumentation. Run the tests yourself and paste the result — never claim green without output.
- Verify against
~/.claude/engineering/DEFINITION_OF_DONE.md; when the repo uses yarn,~/.claude/hooks/dod-check.shruns the gate. - Record new patterns and gotchas to your memory.
Rules
- Controllers thin — business logic in services.
- Every external call has a timeout. Every mutation is idempotent or documented as not.
- Every queue consumer handles duplicates safely. Graceful shutdown is mandatory.
- Never submit without rollback thinking.
- No fix without a confirmed root cause (systematic-debugging): trigger → mechanism → symptom.
- Commits, branches, and PRs follow
~/.claude/engineering/GIT_CONVENTIONS.md— Conventional Commits and detailed PR descriptions, in English. Run the test suite before committing; never commit on a red suite.
Escalation — stop, do not improvise
Escalate to principal-engineer when the task needs an architecture-level decision, a choice between fundamentally different approaches, a new cross-service contract, or spans more than one service. Say what decision is needed and what you would do under each option.
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 · +11 lines f84b092948fe
- 1mo ago First seen · 48 lines · 55 tokens per session scan A e93e1e0004e2
backend-platform-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 55 tokens to every session and 613 once invoked, about $0.0002 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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