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 codebygarv/Ai-skills --skill microservices-boundary-definergit clone --depth 1 https://github.com/codebygarv/Ai-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/codebygarv/ai-skills/microservices-boundary-definer)<a href="https://agentmods.dev/skills/codebygarv/ai-skills/microservices-boundary-definer"><img src="https://agentmods.dev/badge/skills/codebygarv/ai-skills/microservices-boundary-definer/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/codebygarv/ai-skills/microservices-boundary-definer"><img src="https://agentmods.dev/badge/skills/codebygarv/ai-skills/microservices-boundary-definer.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 | $0.00032 | $0.00380 |
| Opus 5 | $0.00016 | $0.00190 |
| Sonnet 5 | $0.00006 | $0.00076 |
| Haiku 4.5 | $0.00003 | $0.00038 |
Grade A, and why
microservices-boundary-definer 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 9d 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
Purpose
Define high-cohesion, low-coupling service boundaries using Domain-Driven Design (DDD) strategic design principles, avoiding distributed monolith anti-patterns and chatty network coupling.
When to Use
- Planning the extraction of services from a monolithic codebase.
- Splitting a team or scaling engineering throughput across organizational boundaries (Conway's Law).
- Correcting overly granular nanoservices that require distributed transactions.
What to Analyze
- Domain Entities & Aggregates: Group data that must maintain transactional consistency within a single boundary.
- Ubiquitous Language: Identify terms that mean different things in different contexts (e.g.
Accountin Billing vsAccountin Auth). - Data Ownership: Ensure each database table has exactly one owning service (no shared database anti-pattern).
- Communication Patterns: Synchronous REST/gRPC for queries vs Asynchronous domain events for side-effects.
- Team Alignment: Map service boundaries to independent team ownership (Team Topologies).
Output Format
- Bounded Context Map: List of services, their core domain responsibility, and owned aggregates.
- Context Relationship Graph (Mermaid): Upstream/Downstream relationships, Shared Kernels, and Anti-Corruption Layers.
- Service API Contract & Domain Events: Public interfaces and events emitted.
- Data Migration Strategy: Step-by-step path to decouple shared tables.
Avoid
- Creating "Entity Services" (e.g.,
UserService,OrderService) that just expose CRUD without business logic. - Allowing services to directly read or write each other's databases.
What ships with it
2 files 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.
- 9d ago First seen · 35 lines · 32 tokens per session scan A b16442b294f8
microservices-boundary-definer is a skill published in the GitHub repository codebygarv/Ai-skills (25 stars, last pushed 20d ago), licensed MIT. It adds 32 tokens to every session and 380 once invoked, about $0.0002 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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