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 skills/xenitv1/claude-code-maestro/backend-designnpx skills add xenitV1/claude-code-maestro --skill backend-designgit clone --depth 1 https://github.com/xenitV1/claude-code-maestroWrote 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/xenitv1/claude-code-maestro/backend-design)<a href="https://agentmods.dev/skills/xenitv1/claude-code-maestro/backend-design"><img src="https://agentmods.dev/badge/skills/xenitv1/claude-code-maestro/backend-design.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 | $0.00024 | $0.02176 |
| Opus 5 | $0.00012 | $0.01088 |
| Sonnet 5 | $0.00005 | $0.00435 |
| Haiku 4.5 | $0.00002 | $0.00218 |
Grade A, and why
backend-design 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 6d 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 — 175 lines — stays where its author put it; the contents beside it link to each section on GitHub.
<domain_overview>
Backend Design System
Philosophy: The Backend is the Fortress. Logic is Law. Latency is the Enemy. Core Principle: ISOLATE features. TRUST no one. SCALE linearly.
ANTI-HAPPY PATH MANDATE (CRITICAL): Never assume the ideal scenario. AI-generated code often fails by ignoring edge cases and failure modes. For every business logic slice, you MUST document and test at least three failure scenarios: Race Conditions, Data Integrity violations (e.g., unique constraint overlaps), and Boundary failures. Reject any implementation that only covers the 'Happy Path'. Engineering is the art of handling what shouldn't happen. </domain_overview>
<architectural_protocols>
🚀 ELITE TIER KNOWLEDGE (ARCHITECTURAL PROTOCOLS)
0. The "Vertical Slice" Law (The Anti-Layer Mandate)
CRITICAL: You are FORBIDDEN from creating "Horizontal Layers" (Controllers, Services, Repositories) as primary folders.
The "Feature-First" Protocol: Code must be organized by BUSINESS CAPABILITY, not technical role.
- The Slice: A single directory (e.g.,
features/create-order/) contains EVERYTHING needed for that feature:handler.ts(Controller)logic.ts(Domain/Service)schema.ts(DTO/Validation)db.ts(Data Access)
- The Benefit: Changing a feature requires touching only ONE folder. No "Shotgun Surgery" across 5 layers.
- Shared Kernel: Only truly generic code (Logging, Auth Middleware, Database Connection) goes into
shared/.
1. The "Modular Monolith" Mandate
- Microservices Ban: Do NOT start with microservices. Start with a Modular Monolith.
- Modulith Rules:
- Modules must be isolated (like internal microservices).
- Modules communicate via Events (Sub-Process or Message Bus), NEVER by importing another module's code directly.
- The Outbox Pattern (Guaranteed Delivery):
- Problem: If DB commit succeeds but Event Bus fails, the system is inconsistent.
- Mandate: Write events to an
outboxtable in the SAME transaction as the data change. - Relay: A background worker pushes
outboxentries to the Message Bus (RabbitMQ/Kafka).
- Data Sovereignty: Module A cannot query Module B's tables. It must ask Module B via API/Event.
What ships with it
1 file 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.
- 6d ago First seen · 175 lines · 24 tokens per session scan A 1696132e0581
backend-design is a skill published in the GitHub repository xenitV1/claude-code-maestro (230 stars, last pushed 7mo ago), licensed MIT. It adds 24 tokens to every session and 2,176 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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