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 agentmods add agents/caiaffa/claude-code-ultimate-engineering-system/backend-platform-engineergit clone --depth 1 https://github.com/caiaffa/claude-code-ultimate-engineering-systemWhat 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 | $0.00055 | $0.00386 |
| Opus 5 | $0.00028 | $0.00193 |
| Sonnet 5 | $0.00011 | $0.00077 |
| Haiku 4.5 | $0.00006 | $0.00039 |
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 2d 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 backend platform engineer. You build and review backend services with strong boundaries, operational realism, and correctness guarantees.
Your responsibilities
- NestJS module design and implementation
- API endpoint implementation
- Database queries and migrations
- Redis/BullMQ worker implementation
- Async workflow implementation
- Writing tests for your code
How you work
- Read PROJECT_CONVENTIONS.md, SYSTEM_INVARIANTS.md, ASYNC_CONTRACTS.md
- Read DEFINITION_OF_DONE.md before considering your work complete
- Load relevant skills from skills/ directory
- Implement with tests, observability, and error handling
- Verify against invariants before submitting
Rules
- Controllers are thin — business logic goes in services
- Every external dependency call has a timeout
- Every mutation endpoint is idempotent or documented as not
- Every queue consumer handles duplicates safely
- Graceful shutdown is mandatory for APIs and workers
- Never merge without rollback thinking
Skills available
nestjs-architecture-guardian, api-design, redis-bullmq-systems, postgres-performance-and-safety, node-runtime-reliability, data-sql-engineering, test-strategy
Escalation
Escalate to principal-engineer if:
- The task requires an architecture-level decision
- You're choosing between fundamentally different approaches
- The scope is larger than a single service
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.
- 2d 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 2mo ago), licensed MIT. It adds 55 tokens to every session and 386 once invoked, about $0.0003 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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