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Agent skill

System Design Communication

by HoangNguyen0403 in HoangNguyen0403/agent-skills-standard

Select how services talk: REST, gRPC, GraphQL, WebSocket, SSE, or webhook per hop, sync versus async per flow, service discovery mode, and DNS/edge routing.

MITAuto-check passedBackend & APIs

Install System Design Communication

skills CLI
$ npx skills add HoangNguyen0403/agent-skills-standard --skill system-design-communication -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install HoangNguyen0403/agent-skills-standard system-design-communication --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/HoangNguyen0403/agent-skills-standard.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/system-design/system-design-communication .claude/skills/system-design-communication && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
system-design-communication
GitHub stars
572
Token cost
~894 tokens
SKILL.md length
401 words
Files
3 (incl. references)
Skills in repo
211
Repo updated
First seen
Licence
MIT

At a glance

Select how services talk: REST, gRPC, GraphQL, WebSocket, SSE, or webhook per hop, sync versus async per flow, service discovery mode, and DNS/edge routing.

  • Choosing a protocol
  • SKILL.md covers Priority: P1 (HIGH), Paradigm Table, Sync vs Async per Flow and Service Discovery, plus 4 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Defer REST contract detail (status codes

What it does

System Design Communication is an agent skill from HoangNguyen0403/agent-skills-standard. Select how services talk: REST, gRPC, GraphQL, WebSocket, SSE, or webhook per hop, sync versus async per flow, service discovery mode, and DNS/edge routing. Use when choosing a protocol or API paradigm; defer REST contract detail (status codes, pagination, OpenAPI) to common-api-design.

Its SKILL.md is about 890 tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including reference files (for example `evals/evals.json` and `references/communication-selection.md`).

It sits in Backend & APIs, covering Realtime and WebSockets, GraphQL and gRPC and Protobuf. It works with gRPC, GraphQL and OpenAPI. The repository describes itself as: A collection of Agent Skills Standard and Best Practice for Programming Languages, Frameworks that help our AI Agent follow best practies on frameworks and programming laguages. The licence is MIT.

When your agent uses it

  • Choosing a protocol
  • Defer REST contract detail (status codes
  • OpenAPI) to common-api-design

Example prompts

  • “/system-design-communication”

What it can do on your machine

Read from SKILL.md and the folder at commit b529c2d. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

System Design Communication loads about 894 tokens when it runs, and up to ~1.9k if it reads all its reference files. Until then it costs about 79 tokens; SKILL.md has 401 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~79
When it runs · the whole SKILL.md, loaded when a task matches
~894
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.9k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from HoangNguyen0403/agent-skills-standard at commit b529c2d, republished under its MIT licence (© HoangNguyen0403). 401 words, ~894 tokens.

Download SKILL.mdSave it as .claude/skills/system-design-communication/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.
name
system-design-communication
description
Select how services talk: REST, gRPC, GraphQL, WebSocket, SSE, or webhook per hop, sync versus async per flow, service discovery mode, and DNS/edge routing. Use when choosing a protocol or API paradigm; defer REST contract detail (status codes, pagination, OpenAPI) to common-api-design.

Communication Selection

Priority: P1 (HIGH)

Choose the paradigm per hop from the constraint, not from familiarity. One flow may legitimately use three.

Paradigm Table

Constraint observedParadigmCost accepted
Resource CRUD for broad, unknown clients; HTTP caching wantedRESTOver/under-fetching; N round trips for aggregates
Internal service-to-service, low latency, streaming, schema-firstgRPCBrowser needs a proxy; L7 balancers need HTTP/2 awareness
One client aggregates many sources with client-shaped responsesGraphQLQuery-cost limits and N+1 resolvers become your problem
Bidirectional real-time (chat, collaboration, gaming)WebSocketStateful connections; LB affinity; reconnect protocol
Server push only (feeds, progress, notifications)SSEOne direction; plain HTTP, auto-reconnect built in
Cross-organization async callbackWebhookReceiver retries, signature verification, idempotency required

Sync vs Async per Flow

  • The caller needs the answer to proceed -> synchronous call with a timeout and a fallback.
  • The caller needs completion, not the answer now -> queue or event; return an id to poll or push the result.
  • Never chain more than 2 synchronous internal hops on a user-facing path; each hop multiplies latency and failure.

Service Discovery

  • Start with DNS-based discovery of a load balancer; it is discovery enough for most systems.
  • Move to a health-checked registry (server-side discovery) when instances churn faster than DNS TTLs propagate.
  • Client-side discovery only when the client must pick the instance (cache affinity, zone-local routing); it couples every client to the registry.
Show full SKILL.md (176 more words)Show less

DNS and Edge Routing

  • DNS TTL is a failover lever: low TTL enables fast region switch, at the cost of resolver load.
  • Geo-DNS routes users to the nearest region; it is routing, not failover - pair it with health checks.
  • Do not use DNS for instance-level balancing; resolvers cache and ignore your weights.

Versioning

  • Additive changes only on live contracts: new fields optional, old fields never repurposed.
  • Breaking change = new version side by side, a deprecation window with usage telemetry, then removal.
  • Internal gRPC/proto: reserve removed field numbers; never reuse them.

Anti-Patterns

  • No one-paradigm-everywhere: edge REST plus internal gRPC plus async events is normal, not inconsistency.
  • No WebSocket for server-push-only: SSE is cheaper and survives proxies better.
  • No webhook without signature, retry policy, and idempotency key: all three, or it is not production.
  • No GraphQL as a proxy for missing API design: schema sprawl without owners is the same mess with resolvers.
  • No sync call to a service that only needs to know: notifications are events.

References

© HoangNguyen0403, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 2 other files (references) in skills/system-design/system-design-communication of HoangNguyen0403/agent-skills-standard.

  • SKILL.md
  • evals/evals.json
  • references/communication-selection.md

Open the folder on GitHubat commit b529c2d

Compare with similar skills

System Design Communication next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

System Design Communication compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
System Design Communication this skillHoangNguyen0403/agent-skills-standard572—~894Automated safety check: PassMIT
API ForgeEliasOulkadi/shokunin114—~2.9kAutomated safety check: PassMIT
API Contract Detectionprime-radiant-inc/greenfield292—~4.2kAutomated safety check: PassApache-2.0
API Designmajiayu000/spellbook287—~2.1kAutomated safety check: PassMIT
API Architectcuriositech/some_claude_skills244—~1.4kAutomated safety check: PassMIT
API Protocol Securityzhaji2333/CkSKILLS115—~520Automated safety check: PassMIT

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Works with

Categories

Questions about System Design Communication

What does System Design Communication do?

Select how services talk: REST, gRPC, GraphQL, WebSocket, SSE, or webhook per hop, sync versus async per flow, service discovery mode, and DNS/edge routing. System Design Communication is an agent skill from HoangNguyen0403/agent-skills-standard. Select how services talk: REST, gRPC, GraphQL, WebSocket, SSE, or webhook per hop, sync versus async per flow, service discovery mode, and DNS/edge routing.

When should I use System Design Communication?

System Design Communication fits situations like: choosing a protocol; defer REST contract detail (status codes; openAPI) to common-api-design.

How do I install System Design Communication in Claude Code?

Run `npx skills add HoangNguyen0403/agent-skills-standard --skill system-design-communication -a claude-code`. Or copy the skill folder (skills/system-design/system-design-communication in HoangNguyen0403/agent-skills-standard) into .claude/skills/system-design-communication in your project. Claude Code loads it when a task matches its description.

How do I install System Design Communication in Codex?

Run `npx skills add HoangNguyen0403/agent-skills-standard --skill system-design-communication -a codex`. Or copy the skill folder (skills/system-design/system-design-communication in HoangNguyen0403/agent-skills-standard) into .agents/skills/system-design-communication in your project. Codex loads it when a task matches its description.

Can I use System Design Communication in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add HoangNguyen0403/agent-skills-standard --skill system-design-communication -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/system-design-communication, .gemini/skills/system-design-communication, .github/skills/system-design-communication and .opencode/skills/system-design-communication in your project.

What does System Design Communication need to run?

SKILL.md names no scripts, command-line tools or credentials: System Design Communication is instructions for the agent only.

Does System Design Communication access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is System Design Communication safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does System Design Communication use?

System Design Communication is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does System Design Communication use?

About 894 tokens (SKILL.md is roughly 3.6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.1k tokens, read only when the agent opens those files.

What are the alternatives to System Design Communication?

Skills that share tags, products or a category with System Design Communication: API Forge (EliasOulkadi/shokunin, 114 stars), API Contract Detection (prime-radiant-inc/greenfield, 292 stars), API Design (majiayu000/spellbook, 287 stars) and API Architect (curiositech/some_claude_skills, 244 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains System Design Communication?

HoangNguyen0403 (a GitHub user) maintains it in HoangNguyen0403/agent-skills-standard, which has 572 GitHub stars. The repository holds 211 skills in this directory. The repository was last updated on October 9, 2026.

Source: HoangNguyen0403/agent-skills-standard on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.