zenrpc

A reference for building JSON-RPC 2.0 servers in Go with ZenRPC, a system for calling server methods through structured messages. It covers generated code, HTTP, WebSocket, and NATS connections.

In plain words
What is it for?
Use it when creating or editing ZenRPC services, changing their API, regenerating code, or working with OpenRPC and SMD descriptions.
Why use it?
It helps keep RPC services and their generated code consistent when you create or change methods, models, or API annotations.

Skill for Claude CodeCodex

Part of the vmkteam-developer plugin — 35 skills shipped together

Install

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.

agentmods
npx agentmods add skills/vmkteam/claude-plugins/zenrpc
Any agent
npx skills add vmkteam/claude-plugins --skill zenrpc
Clone the repo
git clone --depth 1 https://github.com/vmkteam/claude-plugins

Made for: Claude Code, Codex.

Or install vmkteam-developer, the plugin that ships this one along with the rest of its 35 skills.

Per session 35 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,603 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00035 $0.01603
Opus 5 $0.00017 $0.00801
Sonnet 5 $0.00007 $0.00321
Haiku 4.5 $0.00003 $0.00160

Measured 3d ago against content hash d2e0b4050565, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

zenrpc 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 3d 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.

plugins/developer/skills/zenrpc/SKILL.md · 160 lines

How it starts

The opening of the file, as written. The whole thing — 160 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Zenrpc

Codegen

//go:generate go tool zenrpc

go.mod содержит tool github.com/vmkteam/zenrpc/v2/zenrpc. make generate — обязательно после любых изменений в API/моделях/аннотациях. Файлы *_zenrpc.go не редактировать.

Сервис

Встраивание zenrpc.Service; VT-сервисы дополнительно встраивают embedlog.Logger:

type ReviewService struct {
    rm *reviewer.ReviewManager
    zenrpc.Service
}

type ProjectService struct {
    zenrpc.Service
    embedlog.Logger
    projectRepo db.ProjectRepo
}

Сигнатура метода: func (Service) Method([ctx,] [args]) (<value>, <error>) — любой return опционален, value может быть pointer, error = error | *zenrpc.Error.

Аннотации (magic comments)

// GetByID returns review details.
//
//zenrpc:reviewId Review ID
//zenrpc:return Review
//zenrpc:500 Internal Error
//zenrpc:404 Not Found
func (s ReviewService) GetByID(ctx context.Context, reviewId int) (*Review, error) {
  • //zenrpc:<param> Description — описание параметра
  • //zenrpc:<param>=<default> Description — default value
  • //zenrpc:<httpCode> Description — код ошибки
  • //zenrpc:return Description — описание возврата

Ошибки

RPC-слой использует zenrpc.NewStringError, для wrap — zenrpc.NewError:

var (
    ErrInternal   = zenrpc.NewStringError(http.StatusInternalServerError, "internal error")
    ErrNotFound   = zenrpc.NewStringError(http.StatusNotFound, "not found")
    ErrBadRequest = zenrpc.NewStringError(http.StatusBadRequest, "bad request")
)
func newInternalError(err error) *zenrpc.Error {
    return zenrpc.NewError(http.StatusInternalServerError, err)
}

Read the full file on GitHub · 160 lines

Changes

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.

  1. 3d ago First seen · 160 lines · 35 tokens per session scan A d2e0b4050565

Subscribe to this mod's changes

zenrpc is a skill published in the GitHub repository vmkteam/claude-plugins (7 stars, last pushed 4mo ago), licensed MIT. It adds 35 tokens to every session and 1,603 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 2026-08-31.

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