sf-apex: Salesforce Apex Code Generation and Review

Expert Apex developer specializing in clean code, SOLID principles, and 2025 best practices. Generate production-ready, secure, performant, and maintainable Apex code.

Core Responsibilities

1. Code Generation: Create Apex classes, triggers (TAF), tests, async jobs from requirements
2. Code Review: Analyze existing Apex for best practices violations with actionable fixes
3. Validation & Scoring: Score code against 8 categories (0-150 points)
4. Deployment Integration: Validate and deploy via sf-deploy skill

Workflow (5-Phase Pattern)

Phase 1: Requirements Gathering

Use AskUserQuestion to gather:

• Class type (Trigger, Service, Selector, Batch, Queueable, Test, Controller)
• Primary purpose (one sentence)
• Target object(s)
• Test requirements

Then:

1. Check existing code: Glob: **/*.cls, Glob: **/*.trigger
2. Check for existing Trigger Actions Framework setup: Glob: **/*TriggerAction*.cls
3. Create TodoWrite tasks

Phase 2: Design & Template Selection

Select template:

Template Path Resolution (try in order):

1. Marketplace folder: ~/.claude/plugins/marketplaces/sf-skills/sf-apex/templates/[template]
2. Project folder: [project-root]/sf-apex/templates/[template]

Example: Read: ~/.claude/plugins/marketplaces/sf-skills/sf-apex/templates/apex-class.cls

Phase 3: Code Generation/Review

For Generation:

1. Create class file in force-app/main/default/classes/
2. Apply naming conventions (see docs/naming-conventions.md)
3. Include ApexDoc comments
4. Create corresponding test class

For Review:

1. Read existing code
2. Run validation against best practices
3. Generate improvement report with specific fixes

Run Validation:

Score: XX/150 ⭐⭐⭐⭐ Rating
├─ Bulkification: XX/25
├─ Security: XX/25
├─ Testing: XX/25
├─ Architecture: XX/20
├─ Clean Code: XX/20
├─ Error Handling: XX/15
├─ Performance: XX/10
└─ Documentation: XX/10

⛔ GENERATION GUARDRAILS (MANDATORY)

BEFORE generating ANY Apex code, Claude MUST verify no anti-patterns are introduced.

If ANY of these patterns would be generated, STOP and ask the user:

"I noticed [pattern]. This will cause [problem]. Should I: A) Refactor to use [correct pattern] B) Proceed anyway (not recommended)"

DO NOT generate anti-patterns even if explicitly requested. Ask user to confirm the exception with documented justification.

See: resources/security-guide.md for detailed security patterns See: resources/anti-patterns.md for complete anti-pattern catalog

Phase 4: Deployment

Step 1: Validation

Skill(skill="sf-deploy", args="Deploy classes at force-app/main/default/classes/ to [target-org] with --dry-run")

Step 2: Deploy (only if validation succeeds)

Skill(skill="sf-deploy", args="Proceed with actual deployment to [target-org]")

See: resources/troubleshooting.md for deployment prerequisites

Phase 5: Documentation & Testing Guidance

Completion Summary:

✓ Apex Code Complete: [ClassName]
  Type: [type] | API: 65.0
  Location: force-app/main/default/classes/[ClassName].cls
  Test Class: [TestClassName].cls
  Validation: PASSED (Score: XX/150)

Next Steps: Run tests, verify behavior, monitor logs

Best Practices (150-Point Scoring)

Thresholds: ✅ 90+ (Deploy) | ⚠️ 67-89 (Review) | ❌ <67 (Block - fix required)

Deep Dives:

• resources/bulkification-guide.md - Governor limits, collection handling
• resources/security-guide.md - CRUD/FLS, sharing, injection prevention
• resources/testing-patterns.md - Exception types, mocking, coverage
• resources/patterns-deep-dive.md - TAF, @InvocableMethod, async patterns

Trigger Actions Framework (TAF)

Quick Reference

When to Use: If TAF package is installed in target org (check: sf package installed list)

Trigger Pattern (one per object):

trigger AccountTrigger on Account (before insert, after insert, before update, after update, before delete, after delete, after undelete) {
    new MetadataTriggerHandler().run();
}

Action Class (one per behavior):

public class TA_Account_SetDefaults implements TriggerAction.BeforeInsert {
    public void beforeInsert(List<Account> newList) {
        for (Account acc : newList) {
            if (acc.Industry == null) {
                acc.Industry = 'Other';
            }
        }
    }
}

⚠️ CRITICAL: TAF triggers do NOTHING without Trigger_Action__mdt records! Each action class needs a corresponding Custom Metadata record.

Installation:

sf package install --package 04tKZ000000gUEFYA2 --target-org [alias] --wait 10

Fallback: If TAF is NOT installed, use standard trigger pattern (see resources/patterns-deep-dive.md)

See: resources/patterns-deep-dive.md for complete TAF patterns and Custom Metadata setup

Async Decision Matrix

See: resources/patterns-deep-dive.md for detailed async patterns

Modern Apex Features (API 62.0)

• Null coalescing: value ?? defaultValue
• Safe navigation: record?.Field__c
• User mode: WITH USER_MODE in SOQL
• Assert class: Assert.areEqual(), Assert.isTrue()

Breaking Change (API 62.0): Cannot modify Set while iterating - throws System.FinalException

See: resources/bulkification-guide.md for collection usage

Flow Integration (@InvocableMethod)

Apex classes can be called from Flow using @InvocableMethod. This pattern enables complex business logic, DML, callouts, and integrations from declarative automation.

Quick Pattern

public with sharing class RecordProcessor {

    @InvocableMethod(label='Process Record' category='Custom')
    public static List<Response> execute(List<Request> requests) {
        List<Response> responses = new List<Response>();
        for (Request req : requests) {
            Response res = new Response();
            res.isSuccess = true;
            res.processedId = req.recordId;
            responses.add(res);
        }
        return responses;
    }

    public class Request {
        @InvocableVariable(label='Record ID' required=true)
        public Id recordId;
    }

    public class Response {
        @InvocableVariable(label='Is Success')
        public Boolean isSuccess;
        @InvocableVariable(label='Processed ID')
        public Id processedId;
    }
}

Template: Use templates/invocable-method.cls for complete pattern

See:

• resources/patterns-deep-dive.md - Complete @InvocableMethod guide
• docs/flow-integration.md - Advanced Flow-Apex patterns
• docs/triangle-pattern.md - Flow-LWC-Apex triangle

Testing Best Practices

The 3 Test Types (PNB Pattern)

Every feature needs:

1. Positive: Happy path test
2. Negative: Error handling test
3. Bulk: 251+ records test

Example:

@IsTest
static void testPositive() {
    Account acc = new Account(Name = 'Test', Industry = 'Tech');
    insert acc;
    Assert.areEqual('Tech', [SELECT Industry FROM Account WHERE Id = :acc.Id].Industry);
}

@IsTest
static void testNegative() {
    try {
        insert new Account(); // Missing Name
        Assert.fail('Expected DmlException');
    } catch (DmlException e) {
        Assert.isTrue(e.getMessage().contains('REQUIRED_FIELD_MISSING'));
    }
}

@IsTest
static void testBulk() {
    List<Account> accounts = new List<Account>();
    for (Integer i = 0; i < 251; i++) {
        accounts.add(new Account(Name = 'Bulk ' + i));
    }
    insert accounts;
    Assert.areEqual(251, [SELECT COUNT() FROM Account]);
}

See:

• resources/testing-patterns.md - Exception types, mocking, Test Data Factory
• docs/testing-guide.md - Complete testing reference

Common Exception Types

When writing test classes, use these specific exception types:

Example:

@IsTest
static void testExceptionHandling() {
    try {
        insert new Account(); // Missing required Name
        Assert.fail('Expected DmlException was not thrown');
    } catch (DmlException e) {
        Assert.isTrue(e.getMessage().contains('REQUIRED_FIELD_MISSING'),
            'Expected REQUIRED_FIELD_MISSING but got: ' + e.getMessage());
    }
}

See: resources/testing-patterns.md for complete reference

LSP-Based Validation (Auto-Fix Loop)

The sf-apex skill includes Language Server Protocol (LSP) integration for real-time syntax validation. This enables Claude to automatically detect and fix Apex syntax errors during code authoring.

How It Works

1. PostToolUse Hook: After every Write/Edit operation on .cls or .trigger files, the LSP hook validates syntax
2. Apex Language Server: Uses Salesforce's official apex-jorje-lsp.jar (from VS Code extension)
3. Auto-Fix Loop: If errors are found, Claude receives diagnostics and auto-fixes them (max 3 attempts)
4. Two-Layer Validation:
   • LSP Validation: Fast syntax checking (~500ms)
   • 150-Point Validation: Semantic analysis for best practices

Prerequisites

For LSP validation to work, users must have:

• VS Code Salesforce Extension Pack: VS Code → Extensions → "Salesforce Extension Pack"
• Java 11+: https://adoptium.net/temurin/releases/

Graceful Degradation: If LSP is unavailable, validation silently skips - the skill continues to work with only 150-point semantic validation.

See: resources/troubleshooting.md for complete LSP guide

Cross-Skill Integration

Reference Documentation

Quick Guides (resources/)

Full Documentation (docs/)

Path: ~/.claude/plugins/marketplaces/sf-skills/sf-apex/docs/

Dependencies

All optional: sf-deploy, sf-metadata, sf-data. Install: /plugin install github:Jaganpro/sf-skills/[skill-name]

Notes

• API Version: 62.0 required
• TAF Optional: Prefer TAF when package is installed, use standard trigger pattern as fallback
• Scoring: Block deployment if score < 67
• LSP: Optional but recommended for real-time syntax validation

License

MIT License. See LICENSE file. Copyright (c) 2024-2025 Jag Valaiyapathy