# How JetBrains Go Modern Guidelines Help AI Code Agents Avoid Outdated Go Code

> JetBrains Go Modern Guidelines enable AI code agents to avoid outdated Go code by filtering deprecated patterns with version-aware validation and providing current best practices.

- Repository: [JetBrains/go-modern-guidelines](https://github.com/jetbrains/go-modern-guidelines)
- Tags: best-practices
- Published: 2026-08-30

---

**JetBrains Go Modern Guidelines provides a version-aware validation layer that filters deprecated patterns by Go version, enabling AI agents to retrieve only current best practices with executable before/after code examples.**

The JetBrains Go Modern Guidelines repository supplies AI-driven code agents with a lightweight, opinionated library for enforcing contemporary Go standards. By embedding validated guideline data and exposing semantic version filtering, this tool ensures automated systems never suggest obsolete patterns when targeting specific Go releases.

## Version-Aware Architecture for Modern Code

### Embedded Guideline Validation

The foundation of the system rests on a [`guidelines.json`](https://github.com/JetBrains/go-modern-guidelines/blob/main/guidelines.json) file compiled directly into the binary using Go's embed directive. In [internal/guidelines/guidelines.go](https://github.com/JetBrains/go-modern-guidelines/blob/main/internal/guidelines/guidelines.go), the `//go:embed guidelines.json` comment ensures the data ships with the executable.

Upon initialization, the [schema.Parse](https://github.com/JetBrains/go-modern-guidelines/blob/main/internal/guidelines/schema/schema.go) function validates every entry against strict criteria. It verifies that each guideline possesses a valid ID, proper Go version formatting, recognized category and impact levels, and at least one concrete code example. This compile-time validation guarantees that AI agents work with structurally sound recommendations.

### Semantic Version Comparison

To prevent outdated suggestions, the library implements precise version filtering through [internal/goversion/goversion.go](https://github.com/JetBrains/go-modern-guidelines/blob/main/internal/goversion/goversion.go). The `Compare` function parses major and minor version components, normalizing version strings for accurate chronological ordering.

When an AI agent specifies a target Go version, the system excludes any guidelines introduced in later releases. This ensures that a project locked to Go 1.20 never receives recommendations requiring Go 1.22 features, maintaining backward compatibility by design.

## Guideline Retrieval API for AI Agents

### Listing Applicable Rules by Version

The primary entry point for AI integration is the `ListText` function exposed in [internal/guidelines/guidelines.go](https://github.com/JetBrains/go-modern-guidelines/blob/main/internal/guidelines/guidelines.go). Accepting a `targetGoVersion` string parameter, this function returns a filtered set of guidelines where the `since_version` field is less than or equal to the specified version.

This allows automated agents to query the knowledge base dynamically: "What patterns should I avoid when targeting Go 1.21?" The function returns human-readable identifiers and summaries suitable for LLM context windows or IDE tooltips.

### Retrieving Before/After Examples

For concrete refactoring capabilities, the `ExplainText` function resolves specific guideline IDs and constructs detailed transformation instructions. Located in the same [guidelines.go](https://github.com/JetBrains/go-modern-guidelines/blob/main/internal/guidelines/guidelines.go) file, this utility assembles:

- The guideline description and rationale
- Complete before/after code snippets extracted from the embedded JSON
- Metadata regarding impact severity and category classification

AI agents can parse these examples to perform automated code migrations, replacing deprecated constructs with modern equivalents using precise, validated syntax patterns.

## Practical Integration for Code Generation Tools

The following implementation demonstrates how an AI agent might integrate the library to modernize codebases while respecting version constraints:

```go
package main

import (
	"fmt"
	"os"

	"github.com/JetBrains/go-modern-guidelines/internal/guidelines"
)

func main() {
	// Retrieve all guidelines applicable to Go 1.22
	fmt.Println("Modernization rules for Go 1.22:")
	fmt.Println(guidelines.ListText("1.22"))
	
	// Get detailed refactoring instructions for specific rules
	explanation, err := guidelines.ExplainText([]string{"use_generics", "avoid_getwd"})
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error retrieving guidelines: %v\n", err)
		return
	}
	
	fmt.Println("\nRefactoring details:")
	fmt.Println(explanation)
}

```

This pattern allows autonomous agents to validate existing code against current standards and apply verified transformations without hallucinating deprecated APIs or future features incompatible with the project's Go version.

## Summary

- **JetBrains Go Modern Guidelines** embeds a validated JSON knowledge base directly into compiled binaries, ensuring consistent rule availability across environments.
- The **semantic version comparison** engine in `goversion.Compare` filters guidelines by target Go version, preventing suggestions of unavailable language features.
- The **ListText** and **ExplainText** APIs provide AI agents with both high-level rule discovery and detailed, executable code transformations.
- All guidelines undergo **schema validation** at load time, verifying structural integrity and the presence of before/after examples.
- The library's architecture ensures AI-generated code remains synchronized with contemporary Go idioms while respecting legacy version constraints.

## Frequently Asked Questions

### How does the library prevent AI agents from suggesting features unavailable in older Go versions?

The `ListText` function accepts a target version parameter and internally utilizes `goversion.Compare` to filter the guideline database. Only rules with a `since_version` equal to or earlier than the specified version are returned, ensuring compatibility with the project's Go toolchain.

### What validation ensures the guideline data remains accurate and complete?

The `schema.Parse` function in the schema package validates every guideline entry against strict criteria including ID uniqueness, proper semantic versioning format, valid category and impact enumerations, and mandatory code examples. This validation executes during package initialization, preventing malformed data from reaching AI agents.

### Can AI agents retrieve executable code snippets for automated refactoring?

Yes. The `ExplainText` function returns detailed descriptions paired with complete before/after code examples embedded in the guidelines JSON. These snippets are validated during schema parsing and can be parsed by agents to perform concrete syntax transformations programmatically.

### Where does the library store its guideline definitions?

The guideline definitions reside in a [`guidelines.json`](https://github.com/JetBrains/go-modern-guidelines/blob/main/guidelines.json) file that is embedded into the binary using the `//go:embed` directive in [internal/guidelines/guidelines.go](https://github.com/JetBrains/go-modern-guidelines/blob/main/internal/guidelines/guidelines.go). This approach eliminates external dependencies and ensures AI agents have immediate access to the complete knowledge base without network requests.