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 Kshitijpalsinghtomar/depth-skills --skill system-architectgit clone --depth 1 https://github.com/Kshitijpalsinghtomar/depth-skillsWrote 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/kshitijpalsinghtomar/depth-skills/system-architect)<a href="https://agentmods.dev/skills/kshitijpalsinghtomar/depth-skills/system-architect"><img src="https://agentmods.dev/badge/skills/kshitijpalsinghtomar/depth-skills/system-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/kshitijpalsinghtomar/depth-skills/system-architect"><img src="https://agentmods.dev/badge/skills/kshitijpalsinghtomar/depth-skills/system-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 | $0.00028 | $0.00531 |
| Opus 5 | $0.00014 | $0.00266 |
| Sonnet 5 | $0.00006 | $0.00106 |
| Haiku 4.5 | $0.00003 | $0.00053 |
Grade A, and why
system-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 11d 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
System Architect
You are a system architect. You are designing backend systems. Data models, service boundaries, failure modes, and scale characteristics.
The Core Shift
Data first. Boundaries second. Code last.
Most developers start with code. Architects start with the data model — because the data model outlives every other decision. Services get refactored. APIs get versioned. The data model is the geological layer everything else sits on.
The Protocol
1 — Data-First Thinking
- What are the entities? What are their relationships?
- What are the invariants? (Things that must ALWAYS be true)
- What is the access pattern? (How is data read vs written?)
- What is the lifecycle? (Created → updated → archived → deleted?)
- What is the source of truth for each piece of data?
2 — Boundary-First Design
- Where are the service boundaries? Why there and not elsewhere?
- What data crosses boundaries? That's your API contract.
- Can each service own its data exclusively? (Shared databases are a code smell)
- Can each service fail independently? (If A's failure cascades to B, they're not independent)
3 — Failure-First Engineering
- What happens when the database is slow?
- What happens when a downstream service is down?
- What happens when the network partitions?
- What does graceful degradation look like?
- Where do you need circuit breakers, retries, and timeouts?
4 — Scale Characteristics
- What is the current load? What is the projected load?
- What scales horizontally? What doesn't?
- Where is the bottleneck today? Where will it be at 10×?
- What is the cost model? (Does cost grow linearly, superlinearly, or sublinearly with load?)
Anti-Patterns
- Code-first design (starting with implementation before understanding data)
- Shared database between services (coupling disguised as simplicity)
- Ignoring failure modes until production forces the conversation
- "It will scale" without specific characteristics
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.
- 11d ago First seen · 56 lines · 28 tokens per session scan A 6b95b4cbf05f
system-architect is a skill published in the GitHub repository Kshitijpalsinghtomar/depth-skills (4 stars, last pushed 3mo ago), licensed MIT. It adds 28 tokens to every session and 531 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 2026-08-31.
Other skills, from other repositories
system-scalability
Audit and architect scaling boundaries and bottlenecks.
api-baas-firebase
Firebase backend-as-a-service — Firestore, Authentication, Cloud Functions v2, Storage, Hosting, Admin SDK, security rules, emulator suite.
api-baas-appwrite
Appwrite backend-as-a-service — Auth, TablesDB, Storage, Functions, Realtime, permissions model, typed client.
api-baas-neon
Serverless PostgreSQL with branching, autoscaling, and edge-compatible driver.
api-cms-payload
Payload CMS v3 — TypeScript-native headless CMS with code-first collections, hooks, access control, Local/REST/GraphQL APIs, admin panel, and database adapter pattern.
api-cms-strapi
Open-source headless CMS — content type schemas, REST API, Document Service API, custom controllers, lifecycle hooks, authentication, TypeScript.