Release Round
ethereumjs/ethereumjs-monorepo
Runs a coordinated EthereumJS npm release round in six human-gated phases — intent and readiness, CHANGELOG, version bump, publish (human executes), post-publish verification, and announcements.
A skill your agent uses when writing or debugging JavaScript/TypeScript that interacts with Starknet through the starknet.js SDK — building Call objects or calldata, encoding/decoding Cairo types…
Install Starknet JS
$ npx skills add starknet-io/starknet.js --skill starknet-js -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install starknet-io/starknet.js starknet-js --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/starknet-io/starknet.js.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/starknet-js .claude/skills/starknet-js && rm -rf skills-srcUse ~/.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/
Install the "starknet-js" agent skill from https://github.com/starknet-io/starknet.js/tree/develop/skills/starknet-js into .claude/skills/starknet-js/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "starknet-js", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/starknet-io/starknet.js/tree/develop/skills/starknet-jsType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add starknet-io/starknet.js --skill starknet-js -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install starknet-io/starknet.js starknet-js --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/starknet-io/starknet.js.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/starknet-js .agents/skills/starknet-js && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "starknet-js" agent skill from https://github.com/starknet-io/starknet.js/tree/develop/skills/starknet-js into .agents/skills/starknet-js/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "starknet-js", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add starknet-io/starknet.js --skill starknet-js -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install starknet-io/starknet.js starknet-js --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/starknet-io/starknet.js.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/starknet-js .cursor/skills/starknet-js && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "starknet-js" agent skill from https://github.com/starknet-io/starknet.js/tree/develop/skills/starknet-js into .cursor/skills/starknet-js/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "starknet-js", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/starknet-io/starknet.js.git --path skills/starknet-js--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add starknet-io/starknet.js --skill starknet-js -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install starknet-io/starknet.js starknet-js --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/starknet-io/starknet.js.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/starknet-js .gemini/skills/starknet-js && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "starknet-js" agent skill from https://github.com/starknet-io/starknet.js/tree/develop/skills/starknet-js into .gemini/skills/starknet-js/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "starknet-js", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install starknet-io/starknet.js starknet-jsInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add starknet-io/starknet.js --skill starknet-js -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/starknet-io/starknet.js.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/starknet-js .github/skills/starknet-js && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "starknet-js" agent skill from https://github.com/starknet-io/starknet.js/tree/develop/skills/starknet-js into .github/skills/starknet-js/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "starknet-js", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add starknet-io/starknet.js --skill starknet-js -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install starknet-io/starknet.js starknet-js --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/starknet-io/starknet.js.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/starknet-js .opencode/skills/starknet-js && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "starknet-js" agent skill from https://github.com/starknet-io/starknet.js/tree/develop/skills/starknet-js into .opencode/skills/starknet-js/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "starknet-js", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
starknet-js- GitHub stars
- 1.3k
- Token cost
- ~1.2k tokens
- SKILL.md length
- 314 words
- Files
- 3
- Skills in repo
- 1
- Repo updated
- First seen
- Licence
- MIT
At a glance
A skill your agent uses when writing or debugging JavaScript/TypeScript that interacts with Starknet through the starknet.js SDK — building Call objects or calldata, encoding/decoding Cairo types…
- Debugging JavaScript/TypeScript that interacts with Starknet through the starknet.js SDK — building Call objects
- SKILL.md covers Reference files, Non-negotiable rules, Quick reference and Top mistakes (from outdated…
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Encoding/decoding Cairo types (felt252
What it does
Starknet JS is an agent skill from starknet-io/starknet.js. Use when writing or debugging JavaScript/TypeScript that interacts with Starknet through the starknet.js SDK — building Call objects or calldata, encoding/decoding Cairo types (felt252, u256, structs, arrays, spans, ByteArray, Option/Result/custom enums), or working with contracts, accounts, providers, transactions, fees, deployment, or events.
Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `calldata.md` and `interacting.md`).
It sits in Development. It works with JavaScript, TypeScript and Ethereum. The repository describes itself as: JavaScript library for Starknet. The licence is MIT.
When your agent uses it
- Debugging JavaScript/TypeScript that interacts with Starknet through the starknet.js SDK — building Call objects
- Encoding/decoding Cairo types (felt252
- Option/Result/custom enums)
- Working with contracts
Example prompts
- “/starknet-js”
What it can do on your machine
Read from SKILL.md and the folder at commit dbe69e9. 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
Starknet JS loads about 1.2k tokens when it runs. Until then it costs about 90 tokens; SKILL.md has 314 words of instructions outside code blocks.
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 starknet-io/starknet.js at commit dbe69e9, republished under its MIT licence (© starknet-io). 314 words, ~1,229 tokens.
Download SKILL.mdSave it as
.claude/skills/starknet-js/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.- name
- starknet-js
- description
- Use when writing or debugging JavaScript/TypeScript that interacts with Starknet through the starknet.js SDK — building Call objects or calldata, encoding/decoding Cairo types (felt252, u256, structs, arrays, spans, ByteArray, Option/Result/custom enums), or working with contracts, accounts, providers, transactions, fees, deployment, or events.
starknet.js
Official JS/TS SDK for Starknet. Skill verified against starknet.js 10.8.0.
Do not trust training-data memory of starknet.js: it is typically outdated and wrong. Constructors take option objects, only V3 transactions exist (STRK fees, no maxFee). When this skill and memory disagree, the skill wins.
Layer model: Account (signs & submits) wraps RpcProvider (parses, retries) wraps RpcChannel (raw JSON-RPC).
Reference files
- calldata.md — REQUIRED reading before encoding or decoding anything: Call/calldata construction, wire format of every Cairo type, enums (Option/Result/custom), ByteArray, string auto-detection traps, response parsing,
decodeParameters. - interacting.md — providers, accounts, contracts, multicall, fees/tips, declare/deploy, receipts, events, RPC-version compatibility.
Non-negotiable rules
- Only V3 transactions (INVOKE/DECLARE/DEPLOY_ACCOUNT); fees paid in STRK via
resourceBounds+tip. Never suggestmaxFeeor V1/V2. - Constructors take an options object:
new Account({ provider, address, signer }),new Contract({ abi, address, providerOrAccount }),new RpcProvider({ nodeUrl }). - Never prepend an array length to calldata arrays — the library adds it.
Quick reference
| Task | API |
|---|---|
| Connect to node | new RpcProvider({ nodeUrl }) — or await RpcProvider.create({ nodeUrl }) to auto-detect RPC version |
| Account | new Account({ provider, address, signer: privateKey }) |
| Contract | new Contract({ abi, address, providerOrAccount }) |
| Read | await myContract.my_view_fn(arg1, arg2) → parsed JS value |
| Write | const { transaction_hash } = await myContract.my_fn(args) then await provider.waitForTransaction(transaction_hash) |
| Build a Call | myContract.populate('fn', { ...args }) → { contractAddress, entrypoint, calldata } |
| Compile calldata (ABI) | myContract.compile('fn', args) or new CallData(abi).compile('fn', args) |
| Compile calldata (no ABI) | CallData.compile(args) — several traps, see calldata.md |
| Multicall | await account.execute([call1, call2]) |
| Decode raw felts | new CallData(abi).decodeParameters('core::…::Type', feltArray) |
| Events | myContract.parseEvents(receipt), provider.getEvents({ ... }) |
| Deploy | await Contract.factory({ contract, casm, account, constructorCalldata }) |
Top mistakes (from outdated model knowledge)
| Mistake | Fix |
|---|---|
new Account(provider, address, pk) positional | Options object (see above) |
maxFee, V1/V2 transactions, ETH fees | V3 only; resourceBounds from estimateInvokeFee, tip |
Manually prepending array_len | Never — automatic |
CallData.compile([myU256Bigint]) gives 1 felt | Use cairo.uint256(n) without ABI; a plain bigint is fine only with ABI |
new CairoCustomEnum({ OnlyActive: v }) without ABI | Without ABI, list ALL variants (undefined for inactive) |
Expecting .res-style result objects | Cairo 1 returns the value directly (bigint, object, array, enum class) |
© starknet-io, 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 in skills/starknet-js of starknet-io/starknet.js.
- SKILL.md
- calldata.md
- interacting.md
Open the folder on GitHubat commit dbe69e9
Compare with similar skills
Starknet JS 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Starknet JS this skillstarknet-io/starknet.js | 1.3k | — | ~1.2k | Automated safety check: Pass | MIT | |
| Release Roundethereumjs/ethereumjs-monorepo | 2.8k | — | ~2k | Automated safety check: Pass | None | |
| Update Est Fixturesethereumjs/ethereumjs-monorepo | 2.8k | — | ~3.3k | Automated safety check: Pass | None | |
| Code Review ChecklistshareAI-lab/learn-claude-code | 78k | 5 repos | ~1.1k | Automated safety check: Pass | MIT | |
| Install Anti-Slop Oxlint Rulesdmmulroy/anti-slop | 5.3k | — | ~2.2k | Automated safety check: Pass | MIT | |
| Generate Release Notesteambit/bit | 18k | — | ~2.2k | Automated safety check: Pass | Custom licence |
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Questions about Starknet JS
What does Starknet JS do?
A skill your agent uses when writing or debugging JavaScript/TypeScript that interacts with Starknet through the starknet.js SDK — building Call objects or calldata, encoding/decoding Cairo types…. js.js SDK — building Call objects or calldata, encoding/decoding Cairo types (felt252, u256, structs, arrays, spans, ByteArray, Option/Result/custom enums), or working with contracts, accounts, providers, transactions, fees, deployment, or events.
When should I use Starknet JS?
Starknet JS fits situations like: debugging JavaScript/TypeScript that interacts with Starknet through the starknet.js SDK — building Call objects; encoding/decoding Cairo types (felt252; option/Result/custom enums); working with contracts.
How do I install Starknet JS in Claude Code?
Run `npx skills add starknet-io/starknet.js --skill starknet-js -a claude-code`. Or copy the skill folder (skills/starknet-js in starknet-io/starknet.js) into .claude/skills/starknet-js in your project. Claude Code loads it when a task matches its description.
How do I install Starknet JS in Codex?
Run `npx skills add starknet-io/starknet.js --skill starknet-js -a codex`. Or copy the skill folder (skills/starknet-js in starknet-io/starknet.js) into .agents/skills/starknet-js in your project. Codex loads it when a task matches its description.
Can I use Starknet JS 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 starknet-io/starknet.js --skill starknet-js -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/starknet-js, .gemini/skills/starknet-js, .github/skills/starknet-js and .opencode/skills/starknet-js in your project.
What does Starknet JS need to run?
SKILL.md names no scripts, command-line tools or credentials: Starknet JS is instructions for the agent only.
Does Starknet JS 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 Starknet JS 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 Starknet JS use?
Starknet JS 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 Starknet JS use?
About 1.2k tokens (SKILL.md is roughly 4.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Starknet JS?
Skills that share tags, products or a category with Starknet JS: Release Round (ethereumjs/ethereumjs-monorepo, 2.8k stars), Update Est Fixtures (ethereumjs/ethereumjs-monorepo, 2.8k stars), Code Review Checklist (shareAI-lab/learn-claude-code, 78k stars) and Install Anti-Slop Oxlint Rules (dmmulroy/anti-slop, 5.3k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Starknet JS?
starknet-io (a GitHub organization) maintains it in starknet-io/starknet.js, which has 1,253 GitHub stars. The repository was last updated on October 9, 2026.
Source: starknet-io/starknet.js on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.