Agent skill · software engineering · jeremylongshore
alchemy-hello-world
Build a minimal, reviewable Alchemy EVM read with viem and prove its network, authentication, and failure behavior. Use when starting an Alchemy integration or replacing an SDK sample. Trigger with "Alchemy hello world", "read an Ethereum block", or "test my Alchemy connection".
Why this skill is useful
Adds executable scripts for interacting with the Alchemy SDK, enabling blockchain queries that the AI cannot generate on its own.
What it needs
Requires alchemy-sdk installed locally. Requires alchemy account access. About 3k tokens when loaded. Last updated 2026-08-07. 2,604 stars on the source repository.
What this skill does
Alchemy Read-Only Connectivity Proof Overview Build a minimal, reviewable Alchemy EVM read with viem and prove its network, authentication, and failure behavior. This workflow produces a reviewable artifact and negative-path evidence before any live side effect. Prerequisites Current first-party Alchemy documentation for the selected product, chain, feature, client, authentication method, limit, and lifecycle. Named product, application, security, data/privacy, budget, release, and operations owners appropriate to the requested scope. Synthetic or approved non-production fixtures, a credential canary, explicit success criteria, and a tested rollback boundary. Current Contract The current Ethereum quickstart uses viem. A successful ethblockNumber proves endpoint connectivity only; it does not prove Enhanced API, NFT API, Portfolio, Wallet API, or Admin entitlement. Chain identity must be checked from the response context rather than assumed from an endpoint string. Authentication Use a development application key through the repository's approved server-side secret boundary. Never print the URL when it contains a credential. A browser proof requires the allowlist or short-lived-JWT protections documented in the approved threat model. Instructions 1. Choose one supported EVM chain and verify its current endpoint and feature support in first-party documentation. 2. Install a repository-approved, pinned viem release and preserve the lockfile review; do not add alchemy-sdk. 3. Create a public client with the declared viem chain and an Alchemy HTTP transport supplied from the server secret boundary. 4. Read the chain ID and latest block number, assert that the chain ID equals the configured chain, and record only redacted timing and block evidence. 5. Exercise an invalid credential and a deliberately mismatched chain expectation so the proof demonstrates fail-closed behavior. 6. …
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills jeremylongshore/alchemy-hello-world