Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/sandeepmvl/rails-skillsnpx agentmods add skills/sandeepmvl/rails-skills/41-microservices-decompositionWrote 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/sandeepmvl/rails-skills/41-microservices-decomposition)<a href="https://agentmods.dev/skills/sandeepmvl/rails-skills/41-microservices-decomposition"><img src="https://agentmods.dev/badge/skills/sandeepmvl/rails-skills/41-microservices-decomposition/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/sandeepmvl/rails-skills/41-microservices-decomposition"><img src="https://agentmods.dev/badge/skills/sandeepmvl/rails-skills/41-microservices-decomposition.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 | $0.00130 | $0.02554 |
| Opus 5 | $0.00065 | $0.01277 |
| Sonnet 5 | $0.00026 | $0.00511 |
| Haiku 4.5 | $0.00013 | $0.00255 |
Grade A, and why
microservices-decomposition 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.
How it starts
The opening of the file, as written. The whole thing — 284 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Microservices Decomposition
If you're reading this skill instead of
when-NOT-to-use-microservices, you've already justified the operational uplift. This skill is about HOW, not WHETHER. The wrong cuts produce distributed monoliths — same coupling, worse latency.
The opinion
Decompose by bounded context, not by entity. A "Users service" is wrong. An "Identity service" or a "Billing service" is right. Each service owns its data — no cross-service joins, no cross-service foreign keys. Communicate via async events for non-critical flows and HTTP for synchronous queries. Authenticate service-to-service with short-lived JWTs or mTLS. Never write a "shared models gem."
Step 1: Identify bounded contexts
A bounded context is a chunk of business capability with its own ubiquitous language. In an e-commerce monolith:
- Catalog — products, SKUs, categories, descriptions. Owned by content team.
- Inventory — stock levels, reservations, warehouse locations. Owned by ops.
- Orders — cart, checkout, fulfillment state. Owned by commerce.
- Billing — payment methods, invoices, refunds. Owned by finance.
- Identity — users, sessions, OAuth, 2FA. Owned by platform.
- Shipping — carriers, labels, tracking. Owned by logistics.
These are NOT the same as your AR models. A User row might be touched by Identity (auth) and Billing (Stripe customer ID) and Orders (purchase history) — each context has its own view.
How to find boundaries
- Map the language. What words do business folks use? "Order" might mean different things in Cart context vs Fulfillment context.
- Look at team ownership. Who gets paged when X breaks? That person's team should own the service.
- Track who edits what.
git log --pretty=format: --name-onlyfor the last 6 months. Files churned by exactly one team are good candidates for extraction. - Conway's law check. If two teams constantly merge-conflict in the same file, that file is in the wrong service.
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.
- 11d ago First seen · 284 lines · 130 tokens per session scan A d91a06ecf8ca
microservices-decomposition is a skill published in the GitHub repository sandeepmvl/rails-skills (21 stars, last pushed 3mo ago), licensed MIT. It adds 130 tokens to every session and 2,554 once invoked, about $0.0006 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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