diff --git a/AGENTS.md b/AGENTS.md
new file mode 100644
index 00000000..a0975bd7
--- /dev/null
+++ b/AGENTS.md
@@ -0,0 +1,110 @@
+# AI Dev Guide - AMBER API
+
+## Env
+Container: `development-environment-alpha-1`
+Path in container: `~/amber-api`
+Shell: Must use `/bin/bash -l` for PATH
+CMD: `docker exec -it development-environment-alpha-1 /bin/bash -l -c "cd ~/amber-api && bundle exec <cmd>"`
+Direct: Enter container, `cd ~/amber-api`, then run `bundle exec <cmd>`
+
+## Rules
+1. Follow existing patterns
+2. Tests for everything (95%+ coverage)
+3. Follow RuboCop or document exception with reason
+4. Keep it simple: convention over configuration
+5. Don't add gems unless they have real benefit (student-maintained, avoid bloat)
+
+## RuboCop
+Config: `.rubocop.yml`
+Target: Rails 7.2, Ruby 3.3, NewCops: enable
+Disabled: HttpPositionalArguments, HasManyOrHasOneDependent, InverseOf, LexicallyScopedActionFilter, RSpec/LeadingSubject, Documentation, FrozenStringLiteralComment, GuardClause
+Modified: RSpec/NestedGroups Max:5, Style/ClassAndModuleChildren excludes v1 resources, Metrics/BlockLength excludes spec/**
+Exceptions: Must explain why in .rubocop.yml comments
+
+## Structure
+Resources: `app/resources/v1/*.rb` extends `V1::ApplicationResource < JSONAPI::Resource`
+Tests: `spec/resources/v1/*_spec.rb` type: :resource
+Factories: `spec/factories/*.rb` use FactoryBot + Faker
+
+## Resource Template
+```ruby
+# app/resources/v1/model_resource.rb
+class V1::ModelResource < V1::ApplicationResource
+  attributes :attr1, :attr2
+  has_one :user
+  has_many :items
+  filter :field
+  
+  def self.creatable_fields(context)
+    %i[attr1 attr2]
+  end
+  
+  def self.updatable_fields(context)
+    creatable_fields(context)
+  end
+  
+  def self.searchable_fields
+    %i[attr1 attr2]
+  end
+end
+```
+
+## Test Template
+```ruby
+# spec/resources/v1/model_resource_spec.rb
+require 'rails_helper'
+
+RSpec.describe V1::ModelResource, type: :resource do
+  let(:user) { create(:user) }
+  let(:context) { { user: } }
+
+  describe '#creatable_fields' do
+    it { expect(described_class.creatable_fields(context)).to match_array(%i[attr1 attr2]) }
+  end
+
+  describe '#updatable_fields' do
+    it { expect(described_class.updatable_fields(context)).to match_array(%i[attr1 attr2]) }
+  end
+end
+```
+
+## Factory Template
+```ruby
+# spec/factories/models.rb
+FactoryBot.define do
+  factory :model do
+    user
+    attr1 { Faker::Lorem.word }
+    attr2 { [true, false].sample }
+  end
+end
+```
+
+## Test What
+Resources: creatable_fields, updatable_fields, fetchable_fields, searchable_fields, filters, relationships, attributes, permissions
+Models: validations, associations, scopes, methods, callbacks
+Controllers: auth, Pundit policies, response codes, response body, error handling
+
+## Commands
+Test all: `bundle exec rspec`
+Test file: `bundle exec rspec spec/path/to/file_spec.rb`
+Test line: `bundle exec rspec spec/path/to/file_spec.rb:12`
+RuboCop: `bundle exec rubocop`
+RuboCop fix: `bundle exec rubocop -a`
+Guard: `bundle exec guard`
+DB: `bundle exec rails db:migrate`, `bundle exec rails g migration Name`
+
+## Docker Commands
+Enter: `docker exec -it development-environment-alpha-1 /bin/bash -l` then `cd ~/amber-api`
+Start: `cd "C:/Users/jorai/Programeren/1. Alpha/1. Development/amber-api" && docker-compose -f docker-compose.development.yml up -d api`
+Stop: `docker-compose -f docker-compose.development.yml down`
+Logs: `docker logs development-environment-alpha-1`
+
+## Pitfalls
+- Don't use `docker exec ... bundle exec ...` directly (PATH + working dir issues)
+- Don't skip tests
+- Don't ignore RuboCop
+- Don't use hash rockets `{:key => val}` except in excluded dirs
+- Don't over-engineer
+- Don't use `_context` param if unused (keep it for consistency)
+- Do use existing patterns from ApplicationResource for permissions
diff --git a/app/models/activity.rb b/app/models/activity.rb
index 083d59e2..403e9ad7 100644
--- a/app/models/activity.rb
+++ b/app/models/activity.rb
@@ -35,7 +35,7 @@ class Activity < ApplicationRecord
 
   def self.categories
     %w[algemeen societeit vorming kring
-       choose ifes ozon disputen genootschapen huizen extern eerstejaars]
+       choose ifes ozon disputen genootschappen huizen extern eerstejaars]
   end
 
   def full_day?
diff --git a/db/migrate/20260216222433_fix_genootschapen_dyslexia.rb b/db/migrate/20260216222433_fix_genootschapen_dyslexia.rb
new file mode 100644
index 00000000..078a9b4f
--- /dev/null
+++ b/db/migrate/20260216222433_fix_genootschapen_dyslexia.rb
@@ -0,0 +1,13 @@
+class FixGenootschapenDyslexia < ActiveRecord::Migration[7.2]
+  def up
+    Activity.where(category: 'genootschapen').find_each do |activity|
+      activity.update!(category: 'genootschappen')
+    end
+  end
+
+  def down
+    Activity.where(category: 'genootschappen').find_each do |activity|
+      activity.update!(category: 'genootschapen')
+    end
+  end
+end
diff --git a/spec/factories/activities.rb b/spec/factories/activities.rb
index 63692b97..eb6d4f97 100644
--- a/spec/factories/activities.rb
+++ b/spec/factories/activities.rb
@@ -11,7 +11,7 @@
     end_time { Faker::Time.between(from: 1.day.from_now, to: 2.days.from_now) }
     category do
       %w[algemeen societeit vorming kring
-         choose ifes ozon disputen genootschapen huizen extern eerstejaars].sample
+         choose ifes ozon disputen genootschappen huizen extern eerstejaars].sample
     end
     publicly_visible { false }
 
diff --git a/spec/models/activity_spec.rb b/spec/models/activity_spec.rb
index e761f715..33ccc967 100644
--- a/spec/models/activity_spec.rb
+++ b/spec/models/activity_spec.rb
@@ -180,7 +180,7 @@
       let(:record) do
         build_stubbed(:activity,
                       category: %w[algemeen sociëteit vorming kring
-                                   disputen genootschapen huizen extern].sample)
+                                   disputen genootschappen huizen extern].sample)
       end
 
       it { expect(record.humanized_category).to eq record.category.capitalize }