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yorkie-js-sdk: Instructions file for Claude Code

CLAUDE.md

yorkie-js-sdk CLAUDE.md is an instructions file for Claude Code from yorkie-team/yorkie-js-sdk. It costs 593 tokens per session, scanned A, original, Apache-2.0.

Development instructions for Yorkie JavaScript SDK, a pnpm monorepo containing several packages for collaborative editing applications. A monorepo is one repository that holds multiple related packages.

In plain words
What is it for?
Use it to build, lint, test, or update the SDK and its related packages, including React, schema, ProseMirror, and developer-tools packages.
Why use it?
They provide the project’s required setup and checks, including the Yorkie server needed for tests. This reduces failures caused by using the wrong package commands or testing without the required service.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md.

This is yorkie-team/yorkie-js-sdk's own configuration. It tells Claude Code how to work on yorkie-js-sdk itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything yorkie-js-sdk configures →

not rated 162repo yesterday A scan 593 tokens original Apache-2.0
View source ↗ yorkie-team/yorkie-js-sdk yorkie.dev
Reuse

Borrowing it

Nothing to install: this file belongs to yorkie-team/yorkie-js-sdk. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/yorkie-team/yorkie-js-sdk/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/yorkie-team/yorkie-js-sdk

Made for: Claude Code.

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Per session 593 This file is loaded in full into every session.
When invoked 593 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00593 $0.00593
Opus 5 $0.00296 $0.00296
Sonnet 5 $0.00119 $0.00119
Haiku 4.5 $0.00059 $0.00059

Measured 11d ago against content hash 34d27af6f4d0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

yorkie-js-sdk CLAUDE.md 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.

CLAUDE.md · 54 lines

How it starts

The opening of the file, as written. The whole thing — 54 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Yorkie JavaScript SDK

pnpm monorepo with multiple packages for building collaborative editing applications.

Development Commands

pnpm i                       # Install (pnpm enforced)
pnpm sdk build               # Build core SDK
pnpm sdk build:proto         # Regenerate protobuf code (buf generate)
pnpm lint                    # ESLint with auto-fix (zero warnings enforced)

# Tests require a running Yorkie server:
docker compose -f docker/docker-compose.yml up --build -d
pnpm sdk test                # Run all SDK tests
pnpm sdk test test/integration/tree_test.ts  # Specific test file

Package filters: pnpm sdk, pnpm react, pnpm schema, pnpm prosemirror, pnpm devtools

After Making Changes

Always run before submitting:

pnpm lint && pnpm sdk build && pnpm sdk test

Project Docs

  • Design docs: docs/design/ for architectural context. New docs use TEMPLATE.md.
  • Task tracking: docs/tasks/active/ for in-progress, docs/tasks/archive/ for completed. Use YYYYMMDD-<slug>-{todo,lessons}.md pairs.
  • Setup: Husky manages git hooks. Run pnpm install to set up automatically.

Packages

  • sdk (@yorkie-js/sdk) — Core: client, documents, CRDTs, protobuf API
  • react (@yorkie-js/react) — React hooks/providers
  • prosemirror (@yorkie-js/prosemirror) — ProseMirror binding
  • schema (@yorkie-js/schema) — ANTLR-based schema validation (antlr/YorkieSchema.g4)
  • devtools (@yorkie-js/devtools) — Chrome extension (Plasmo)
  • mcp — Model Context Protocol integration

Gotchas

  • Protobuf source of truth is in yorkie-team/yorkie, not this repo
  • ESLint enforces zero warnings — CI and pre-commit hooks will reject any warnings
  • Tests use Vitest with custom-jsdom environment
  • Use .only on describe/it blocks to run specific tests within a file
  • Prettier config: single quotes, trailing commas, 80 char width

Read the full file on GitHub · 54 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. 11d ago First seen · 54 lines · 593 tokens per session scan A 34d27af6f4d0

Subscribe to this mod's changes

yorkie-js-sdk CLAUDE.md is an instructions file published in the GitHub repository yorkie-team/yorkie-js-sdk (162 stars, last pushed yesterday), licensed Apache-2.0. It adds 593 tokens to every session, about $0.0030 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.

collaborative-applicationscrdtgrpc-webrealtime-collaborationyorkieyorkie-js-sdk
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