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SIWA SDK — measured AI agent skill | DecimalAI

bankrbot/siwa

NewSkillScoreMaintained

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

agent-toolingby bankrbot

Links this skill to your agents and keeps it current with the author’s updates.

Automatic

Coding pack

decimalai skills pull bankrbot-siwa

Get this skill — curl · raw file

curl -fsSL https://app.decimal.ai/s/bankrbot-siwa/SKILL.md

Raw file: /s/bankrbot-siwa/SKILL.md ↗ · machine-readable summary at /s/bankrbot-siwa.json ↗

In productionGlobal

how this skill behaves on real traffic · last 30 days

No production data for this skill yet — usage numbers appear here once agents start running it.

Anonymized aggregate across every org using this skill — proof from real production use, not a demo.

Does this skill help? · Benchmark: with vs. withoutsign in to run this on your agents

23 test cases from the publisher’s eval.yaml · each run twice on gemini-3.6-flash — with the skill injected, then without · last run 4h ago

Yes — +61% lift-45% tokens0% turns78% of whole cases pass with skill (18/23)

Test case	Without → With	Effect	Δ tokens	Δ turns
case-01	✗→✓	▲ Improved	-37%	0%
case-02	✗→✓	▲ Improved	-33%	0%
case-03	✗→✓	▲ Improved	-39%	0%
case-04	✗→✓	▲ Improved	-57%	0%
case-05	✗→✓	▲ Improved	-58%	0%

Showing 5 of 23 cases

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

bankrbot / skills

siwa/SKILL.md

View on GitHub ↗

Imported 8/3/2026Version v1Bundled 2 files

Skill contents

references/

SKILL.md

SIWA SDK

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

Install

bash
npm install @buildersgarden/siwa

Skills

Agent-Side (Signing)

Choose based on your wallet provider:

Bankr — Bankr Agent API wallets

Server-Side (Verification)

Server-Side Verification — Next.js, Express, Hono, Fastify

SDK Modules

| Import | Description | |--------|-------------| | @buildersgarden/siwa | Core: signSIWAMessage, verifySIWA, createSIWANonce | | @buildersgarden/siwa/signer | Signer factories | | @buildersgarden/siwa/erc8128 | ERC-8128 HTTP signing/verification | | @buildersgarden/siwa/receipt | HMAC receipt helpers | | @buildersgarden/siwa/nonce-store | Nonce stores (Memory, Redis, KV) | | @buildersgarden/siwa/next | Next.js middleware | | @buildersgarden/siwa/express | Express middleware | | @buildersgarden/siwa/hono | Hono middleware | | @buildersgarden/siwa/fastify | Fastify middleware |

Links

Want to see if bankrbot/siwa would activate on your phrasing? Try it before you install — no LLM call, no signup.

Other measured skills in the registry, with their headline benchmark lift.