Generate Artifact

Status: Live on the public MCP. Tool: generate_artifact.

Amsterdam

Generate a BAL for a block with one plain ETH transfer on Amsterdam.

Look forBAL JSON and its hash

Agent will likely call generate_artifactWhat you can ask →

Purpose

Derive structured artifacts from a lab block run — same inputs as Run Block (1–8 txs, accounts, optional header). First kind: block-access-list (EIP-7928 BAL JSON + hash).

BYOS lab only. Does not verify the BAL of a mainnet block without archive parent state.

MCP tool name

generate_artifact

Inputs

Same as run_block, plus optional kind (block-access-list, default).

Outputs

Field	Description
artifactKind	block-access-list
bal	Engine API JSON
hash	blockAccessListHash commitment
itemCount / maxItems	EIP-7928 item cap vs lab block gas limit
provenance	Fork and engine metadata

Pair with Inspect Artifact on caller-supplied BAL payloads.

JSON schema

generate_artifact.input.json

Generate Artifact Changelog

Generate Artifact Changelog

1. v0.32026-10-06Public endpoint is live.
2. v0.22026-09-22Renamed MCP tool generate → generate_artifact (query shape stays generate).
3. v0.12026-09-16Implemented — BAL from lab block on Glamsterdam.