Imported from xssnick/tonutils-go (AGENTS.md). Install upstream with npx skills add xssnick/tonutils-go. Copyright stays with the author.

AGENTS.md

Guidance for coding agents working in github.com/xssnick/tonutils-go.

This document is intentionally repo-specific. Follow the existing code and package boundaries here before applying generic Go advice.

Project Shape

tonutils-go is split by protocol layer and domain:

• address: TON address parsing, formatting, flags, bit helpers.
• tl: TL schema registration, loader/serialization primitives.
• tlb: TLB loaders/serializers built on top of cells and struct tags.
• tvm/cell: core cell, slice, builder, dict, proof, BoC primitives.
• tvm, tvm/vm, tvm/op/*, tvm/tuple, tvm/vmerr: TVM emulator and opcode implementation.
• adnl, adnl/dht, adnl/overlay, adnl/rldp: transport and overlay protocols.
• liteclient: liteserver connection pool, balancing, sticky contexts, config loading.
• ton: high-level blockchain API on top of liteclient, proofs, block/account/transaction access.
• ton/wallet, ton/nft, ton/jetton, ton/dns: domain clients built on ton.
• toncenter: HTTP-based client as a separate access path.
• example: runnable user-facing examples, kept small and practical.

When adding code, keep it at the lowest layer that owns the responsibility. Do not pull high-level TON client concerns into tl, tlb, tvm/cell, or transport packages.

API design

• Prefer linear APIs.

• Do not use tri-state returns like (value, ok, err) in storage and domain code.

• When data may be absent, use (value, error) and return a dedicated not-found error such as ErrNotFound.

• If err == nil, the returned value must already be valid and ready to use.

• Do not design APIs where err == nil but the caller still has to inspect ok or check the value for nil.

• Keep boolean returns only when they represent a real property or business flag, not presence or absence of data.

• Do not add wrapper APIs, aliases, or renames that do not simplify the code.

• Avoid patterns like:

  • type X = Y
  • type Options = ImplOptions
  • Open -> OpenImpl

• Name public types and functions correctly once and use them directly.

• Do not introduce internal conversion helpers like fromX and toX unless there is a real format boundary, protocol boundary, or external API boundary.

• Inside the project, prefer using the actual types directly.

Code style

• Add empty lines between logical blocks inside functions.

• Do not make excessive nil checks.

• Check only what can really be nil logically. Do not check obvious input values for nil, which are intended to have a value.

• Do not check obvious value inputs for nil.

• Do not add defensive nil/self-guard checks for required inputs, even when they are pointers. If a pointer is part of an internal invariant and the caller must provide it, use it directly.

• Required fields should not get fallback encoding or "just in case" nil handling.

• Treat low-level code as potentially hot. Add runtime checks only when they protect a real boundary, enforce an invariant that can be violated in normal use, or prevent a meaningful safety issue. Avoid defensive checks that duplicate earlier validation or guard states that cannot happen through the package API.

• Keep code simple and optimized.

• Add abstractions only when they remove real duplication or represent a real boundary.

• Prefer straightforward Go-style code.

• Keep the control flow linear and easy to read.

• Avoid unnecessary indirection.

• Beware of fallbacks, each fallback must have a strong reason why it is necessary and commented.

• Do not leave useless short wrapper methods, less calls are better unless it is big piece of code which is used in many places

• Do not handle both T and *T in type switches "just in case". Pick the concrete representation owned by that layer, convert once at a real boundary, and pass that concrete type through the rest of the code. Existing protocol-boundary compatibility helpers are exceptions, not patterns to copy.

Protocol types

• Any type used in tl.Register(...) must be public and named with a capital letter.

Tests

• Keep test-only constants, hooks, and helpers in _test.go files.
• Do not leave test-only code in normal production files.

Architecture Rules

• Treat tvm/cell, tl, and tlb as foundational packages. They should stay reusable and mostly independent from higher-level TON client logic.
• Keep transport and business logic separate. liteclient handles connectivity, node selection, stickiness, retries/timeouts at transport level; ton handles proof-aware blockchain semantics on top.
• Put domain-specific smart-contract clients under ton/* packages, not in liteclient or low-level protocol packages.
• Keep compatibility wrappers when API evolution is cheap. This repo already preserves deprecated aliases, wrapper methods, and compatibility files instead of breaking callers aggressively.
• File naming usually mirrors protocol version or variant: client-v2.go, client-v3.go, v5r1.go, overlay-adnl.go, item-editable.go. Follow that pattern instead of inventing abstract names.

Coding Style Seen In This Repo

• Use idiomatic Go with gofmt. Do not mass-reformat unrelated files just to normalize import groups or spacing.
• Keep comments and docs in English. Existing README, examples, and code comments are English-first.
• Prefer small exported constructors and wrappers with familiar names:
  • NewX
  • FromX
  • WithX
  • MustX
• Safe methods usually return error; panic-based variants are explicitly named Must*.
• Panic is acceptable for programmer errors or impossible internal states, not normal runtime failures.
• Public APIs favor straightforward structs and functional options over deep builder frameworks.
• Errors are usually wrapped with precise context using fmt.Errorf("failed to ...: %w", err).
• Prefer early returns and explicit branching over clever control flow.
• Short local names are normal when context is obvious: ctx, addr, b, res, api, cfg, st.
• Keep wire/protocol registration near the owning package. init() is used here for TL registration and similar setup, so adding another localized init() is acceptable when it matches existing patterns.
• Preserve concurrency guarantees. Networking code relies on context, sync, sync/atomic, and careful request bookkeeping; avoid changes that weaken thread safety.

API Design Patterns To Match

• If you add a convenience API, keep the lower-level path available too.
• If behavior is configurable, prefer wrapper/option style already used in the repo:
  • WithRetry
  • WithTimeout
  • WithAPI
  • WithSigner
• If a type has both ergonomic and strict forms, mirror the existing duality:
  • safe method returning error
  • Must* helper panicking on misuse
• For public-facing TON clients, preserve the current feel: practical, direct, and easy to use from examples.

Testing Conventions

• Use the standard testing package only. This repo does not rely on testify-style assertion libraries.
• Prefer direct assertions with t.Fatal / t.Fatalf / t.Errorf.
• Use t.Run for grouped cases and table-driven tests where it improves clarity.
• Add regression tests close to the touched package, especially for:
  • serialization/deserialization
  • proof validation
  • dictionary logic
  • stack/opcode behavior
  • network failover/sticky behavior
• Keep unit tests deterministic when possible.
• Integration tests exist and often touch live TON infrastructure. Do not silently turn ordinary unit coverage into network-dependent tests.

Examples And Docs

• example/ programs are part of the public face of the library. Keep them concise, runnable, and focused on one task.
• When a change affects user workflow, update or add an example if the package is example-driven.
• Prefer practical comments that explain protocol nuance, invariants, or surprising behavior. Avoid boilerplate commentary.

Change Strategy

• Make narrow changes that respect package ownership.
• Avoid introducing upward dependencies from low-level packages into high-level ones.
• Preserve backward compatibility where reasonable; this repo often keeps deprecated entry points instead of removing them immediately.
• When changing serialization, proof, or protocol code, add round-trip or regression tests in the same area.
• When changing high-level APIs in ton/*, verify the surrounding wrappers and examples still make sense.

Useful Local Checks

Typical checks for this repo:

• go build -v ./...
• go test -v -failfast $(go list ./... | grep -v /example/)
• targeted package tests such as go test ./ton/... or go test ./tvm/cell

CI currently builds the whole repo and runs tests excluding example/ packages, so mirror that unless your change is intentionally example-only.

What Usually Fits Poorly Here

• Large cross-package refactors without a protocol or API reason.
• New abstractions that hide simple request/response flows.
• Pulling high-level TON logic into foundational packages.
• Replacing explicit error handling with magical helpers.
• Introducing third-party test/assert dependencies for ordinary package tests.