arbitrum

name	arbitrum
description	Arbitrum Nitro L2 stack—architecture, ADRs, gas model, BOLD dispute protocol, and repo conventions.
metadata	{"author":"hairy","version":"2026.2.24","source":"Generated from https://github.com/OffchainLabs/nitro"}

Skill is based on Arbitrum Nitro (OffchainLabs/nitro), generated from source at the listed date. Main docs live at nitro-docs and developer.arbitrum.io.

Nitro is the current Arbitrum L2 stack: Geth for execution, ArbOS for L2 chain services (bridges, batching, compression), and WASM-based interactive fraud proofs. The Nitro repo contains the node implementation, ADRs, and the BOLD dispute protocol integration; run/build and operator docs are in the external documentation.

Core References

Topic	Description	Reference
Nitro overview	Stack (Geth, ArbOS, WASM proofs), where docs live, audits	core-about
ADRs	MADR format, templates, adding decisions under docs/decisions/	core-decisions-adr

Features

Topic	Description	Reference
Multi-dimensional gas	ResourceKind categories, L1/L2 calldata, WASM (Stylus) metering	features-multidimensional-gas
BOLD protocol	Dispute system, assertion poster/scanner, edge trackers, L2 state provider	features-bold-protocol

Best Practices

Topic	Description	Reference
Changelog fragments	Format, sections (Added/Changed/Configuration/Ignored), one file per PR	best-practices-changelog
Constraint types (Go)	Avoid primitive constraint wrappers; keep checks at call sites	best-practices-constraint-types