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Agent skill

Siwa

by BankrBot in BankrBot/skills

SIWA (Sign-In With Agent) authentication for ERC-8004 registered agents.

No licenceAuto-check passedBackend & APIs

Install Siwa

skills CLI
$ npx skills add BankrBot/skills --skill siwa -a claude-code

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

GitHub CLI
$ gh skill install BankrBot/skills siwa --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/BankrBot/skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/siwa .claude/skills/siwa && 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
siwa
GitHub stars
1.2k
Token cost
~379 tokens
SKILL.md length
87 words
Files
4 (incl. references)
Skills in repo
106
Repo updated
First seen
Licence
None found

At a glance

SIWA (Sign-In With Agent) authentication for ERC-8004 registered agents.

  • Tasks that involve Authentication
  • SKILL.md covers Install, Skills, SDK Modules and Links
  • Calls npm

What it does

Siwa is an agent skill from BankrBot/skills. SIWA (Sign-In With Agent) authentication for ERC-8004 registered agents.

Its SKILL.md is about 380 tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including reference files (for example `catalog.json`, `references/bankr-signer.md` and `references/server-side.md`).

It sits in Backend & APIs, covering Authentication. It works with Fastify and Hono. The repository describes itself as: Bankr Skills equip builders with plug-and-play tools to build more powerful agents.

When your agent uses it

  • Tasks that involve Authentication

Example prompts

  • “/siwa”

Requirements

  • Node.js

What it can do on your machine

Read from SKILL.md and the folder at commit dc47eed. 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

    Shell commands in SKILL.md call:

    • npm

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

  • Network

    Links to these hosts (documentation or services it may open):

    • siwa.id
    • eips.ethereum.org

    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

Siwa loads about 379 tokens when it runs, and up to ~4.4k if it reads all its reference files. Until then it costs about 19 tokens; SKILL.md has 87 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~19
When it runs · the whole SKILL.md, loaded when a task matches
~379
With references · SKILL.md plus every file in references/, read only if the agent opens them
~4.4k

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

Without a licence we can't republish the file, so here is its outline and opening line. It has 87 words (~379 tokens).

“Sign-In With Agent (SIWA) lets AI agents authenticate with services using their ERC-8004 onchain identity.”

— opening of SKILL.md by BankrBot
name
siwa
version
0.2.0

Read the full SKILL.md on GitHub

Files

SKILL.md and 3 other files (references) in siwa of BankrBot/skills.

  • SKILL.md
  • catalog.json
  • references/bankr-signer.md
  • references/server-side.md

Open the folder on GitHubat commit dc47eed

Compare with similar skills

Siwa 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.

Siwa compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Siwa this skillBankrBot/skills1.2k—~379Automated safety check: PassNone
Create Platform Adaptertsedio/tsed3.1k—~2.7kAutomated safety check: PassMIT
Fishjam JS Server SDKsoftware-mansion-labs/skills291—~1.4kAutomated safety check: PassMIT
Senior Backendalirezarezvani/claude-skills28k1 repos~3.8kAutomated safety check: PassMIT
Better Autheinverne/dotfiles121—~4kAutomated safety check: NotesMIT
Workflow Initusenotra/notra256—~821Automated safety check: PassAGPL-3.0

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Works with

Categories

Questions about Siwa

What does Siwa do?

SIWA (Sign-In With Agent) authentication for ERC-8004 registered agents. Siwa is an agent skill from BankrBot/skills. SIWA (Sign-In With Agent) authentication for ERC-8004 registered agents.

When should I use Siwa?

Siwa fits situations like: tasks that involve Authentication.

How do I install Siwa in Claude Code?

Run `npx skills add BankrBot/skills --skill siwa -a claude-code`. Or copy the skill folder (siwa in BankrBot/skills) into .claude/skills/siwa in your project. Claude Code loads it when a task matches its description.

How do I install Siwa in Codex?

Run `npx skills add BankrBot/skills --skill siwa -a codex`. Or copy the skill folder (siwa in BankrBot/skills) into .agents/skills/siwa in your project. Codex loads it when a task matches its description.

Can I use Siwa 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 BankrBot/skills --skill siwa -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/siwa, .gemini/skills/siwa, .github/skills/siwa and .opencode/skills/siwa in your project.

What does Siwa need to run?

Going by SKILL.md and its folder, Siwa needs the command-line tools its instructions call (npm). Our summary lists: Node.js.

Does Siwa access the network?

SKILL.md names 2 domains. As links in the text: siwa.id and eips.ethereum.org. This is read from the text; nothing was executed.

Is Siwa 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 Siwa use?

No licence was found for Siwa or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does Siwa use?

About 379 tokens (SKILL.md is roughly 1.5k 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 4k tokens, read only when the agent opens those files.

What are the alternatives to Siwa?

Skills that share tags, products or a category with Siwa: Create Platform Adapter (tsedio/tsed, 3.1k stars), Fishjam JS Server SDK (software-mansion-labs/skills, 291 stars), Senior Backend (alirezarezvani/claude-skills, 28k stars) and Better Auth (einverne/dotfiles, 121 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Siwa?

BankrBot (a GitHub organization) maintains it in BankrBot/skills, which has 1,202 GitHub stars. The repository holds 106 skills in this directory. The repository was last updated on October 10, 2026.

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