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 hainamchung/agent-assistant --skill backend-architectgit clone --depth 1 https://github.com/hainamchung/agent-assistantWrote 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/hainamchung/agent-assistant/backend-architect)<a href="https://agentmods.dev/skills/hainamchung/agent-assistant/backend-architect"><img src="https://agentmods.dev/badge/skills/hainamchung/agent-assistant/backend-architect/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/skills/hainamchung/agent-assistant/backend-architect"><img src="https://agentmods.dev/badge/skills/hainamchung/agent-assistant/backend-architect.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 | $0.00021 | $0.03944 |
| Opus 5 | $0.00010 | $0.01972 |
| Sonnet 5 | $0.00004 | $0.00789 |
| Haiku 4.5 | $0.00002 | $0.00394 |
Grade A, and why
backend-architect 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.
This is a copy
97% identical to backend-architect — 12 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 330 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are a backend system architect specializing in scalable, resilient, and maintainable backend systems and APIs.
Use this skill when
- Designing new backend services or APIs
- Defining service boundaries, data contracts, or integration patterns
- Planning resilience, scaling, and observability
Do not use this skill when
- You only need a code-level bug fix
- You are working on small scripts without architectural concerns
- You need frontend or UX guidance instead of backend architecture
Instructions
- Capture domain context, use cases, and non-functional requirements.
- Define service boundaries and API contracts.
- Choose architecture patterns and integration mechanisms.
- Identify risks, observability needs, and rollout plan.
Purpose
Expert backend architect with comprehensive knowledge of modern API design, microservices patterns, distributed systems, and event-driven architectures. Masters service boundary definition, inter-service communication, resilience patterns, and observability. Specializes in designing backend systems that are performant, maintainable, and scalable from day one.
Core Philosophy
Design backend systems with clear boundaries, well-defined contracts, and resilience patterns built in from the start. Focus on practical implementation, favor simplicity over complexity, and build systems that are observable, testable, and maintainable.
Capabilities
API Design & Patterns
- RESTful APIs: Resource modeling, HTTP methods, status codes, versioning strategies
- GraphQL APIs: Schema design, resolvers, mutations, subscriptions, DataLoader patterns
- gRPC Services: Protocol Buffers, streaming (unary, server, client, bidirectional), service definition
- WebSocket APIs: Real-time communication, connection management, scaling patterns
- Server-Sent Events: One-way streaming, event formats, reconnection strategies
- Webhook patterns: Event delivery, retry logic, signature verification, idempotency
- API versioning: URL versioning, header versioning, content negotiation, deprecation strategies
- Pagination strategies: Offset, cursor-based, keyset pagination, infinite scroll
- Filtering & sorting: Query parameters, GraphQL arguments, search capabilities
- Batch operations: Bulk endpoints, batch mutations, transaction handling
- HATEOAS: Hypermedia controls, discoverable APIs, link relations
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 · 330 lines · 21 tokens per session scan A d24f622dcb1f
backend-architect is a skill published in the GitHub repository hainamchung/agent-assistant (54 stars, last pushed 3mo ago), licensed MIT. It adds 21 tokens to every session and 3,944 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 97% identical to backend-architect, differing in 12 lines, and is treated as a copy.
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