LLMS Amplifier Changelog

A WordPress plugin for generating and managing llms.txt and llms-full.txt files to help AI language models better understand and interact with your website content.

Author: Brian Winum Website: brianwinum.com Current Version: 2.3.7

Version 2.3.7 — Hybrid Content Filtering

Released March 2026

This release introduces a multi-layered approach to content filtering, giving site owners fine-grained control over which content appears in their LLMS files.

Hybrid Content Filtering Engine

Added a three-layer filtering system for noindex detection:
- Layer 1 — Database-level meta queries supporting 8 SEO plugins: Yoast, Rank Math, AIOSEO, SEOPress, The SEO Framework, and SmartCrawl
- Layer 2 — Optional wp_robots() fallback for unknown or unsupported SEO plugins (WordPress 5.7+)
- Layer 3 — Developer filters (llms_amplifier_noindex_meta_query, llms_amplifier_filter_posts) for custom filtering logic

Per-Post Exclusion Controls

New “Exclude from llms.txt” checkbox available in the post, page, and product editors
Admin list column showing LLMS.txt inclusion status at a glance, with quick edit and bulk edit support

WooCommerce Visibility Filtering

Hidden catalog products now automatically excluded
Functional WooCommerce pages (Cart, Checkout, My Account, Shop) automatically excluded

Other Improvements

Password-protected content excluded by default
New Content Filtering Settings section in the admin dashboard with strict filtering toggle
SEO plugin detection display showing which plugins are active and recognized

New Files: class-llms-amplifier-content-filter.php, class-llms-amplifier-exclusion-meta-box.php

Version 2.3.6 — Activation Timeout Fix

Released January 2026

A critical stability update that resolves plugin activation failures across a wide range of hosting environments.

Resolved activation timeout issue caused by running full content generation during WordPress's activation window
File generation is now deferred to 60 seconds after activation via wp_schedule_single_event(), preventing PHP execution time limit errors
Improved error handling and security logging for first-time file generation
Enhanced stability for large sites with thousands of posts, products, and custom fields
Deactivation and uninstall routines updated to clean up the new scheduled hook

Version 2.3.5 — WordPress Compatibility Fix

Released late 2025

Fixed fatal error caused by calling wp_cache_delete_many(), which is not a standard WordPress function
Fixed wp_cache_flush_group() calls to check function existence before invoking (only available in WordPress 6.1+)
Improved compatibility with older WordPress versions and shared hosting environments

Version 2.3.4 — Cache Management Fix

Released December 2025

This release fixed a critical caching issue where regenerated LLMS files were serving stale content instead of pulling fresh data.

All caches are now cleared before file generation — main content cache, post query cache, and subdirectory caches
Added cache_results => false to all WP_Query calls to bypass WordPress internal query caching
Switched from get_posts() to WP_Query for better cache control
Single shared content generator instance prevents stale cache state conflicts between file types
Automatic cache invalidation triggered when posts are created, updated, or deleted via clean_post_cache()
Enhanced debug logging for cache clearing operations (visible when WP_DEBUG is enabled)
Fixed Safari checkbox and button clickability issue in the admin CSS (removed transform: scale() on form elements)

Version 2.3.3 — Cache Implementation & Timestamp Merge

Released December 2025

Initial cache clearing implementation for regenerated files
Shared content generator instance introduced to prevent conflicting cache states
Merged the v2.3.2 timestamp display fix and v2.3.0 full functionality into one consolidated admin JS file (v2.3.3)

Version 2.3.2 — Timestamp Display Fix

Released mid-2025

Fixed timestamp display to update in the admin dashboard without requiring a page reload after regeneration
Auto-refresh timestamp display using jQuery fade transitions

Version 2.3.1 — Authentication Token Update

Released mid-2025

Updated GitHub authentication token for the automatic update system
Improved update mechanism reliability and token expiration handling

Version 2.3.0 — Automatic Meta Tag Injection

Released July 2025

A discoverability-focused release that helps AI crawlers find your LLMS files automatically.

Injects <link rel="alternate" type="text/plain"> meta tags into all page headers, pointing to your LLMS files
Configurable options for which files to reference (llms.txt, llms-full.txt, subdirectory files)
Customizable title attributes on meta tags for better context
Full multisite compatibility
Settings migration for existing installations — meta tags disabled by default on upgrade to avoid unexpected changes
Admin notice alerting existing users to the new feature

Version 2.2.2 — Automatic Update Improvements

Released July 2025

Improved the automatic plugin update distribution pipeline
Removed the need for users to configure GitHub tokens or edit wp-config.php
Seamless, zero-configuration updates through the standard WordPress update system

Version 2.2.1 — Update Mechanism Fixes

Released July 2025

Resolved issues with the GitHub-based update mechanism
Improved reliability of version detection and download URL resolution

Version 2.2.0 — Creative Commons Attribution

Released July 2025

Added optional Creative Commons Attribution 4.0 International (CC BY 4.0) license headers
When enabled, the license header is automatically prepended to all generated LLMS files
Helps clarify content reuse permissions for AI systems and crawlers

Version 2.1.13 — Update Checker Stabilization

Released July 2025

This release resolved persistent issues with the GitHub-based plugin update system.

Removed custom force-release functions that were interfering with natural update detection
Simplified update checker initialization for reliability
Set a reasonable 12-hour check frequency (previously 1 hour)
Fixed GitHub Actions workflow permissions for uploading release assets
Resolved issue where updates downloaded source code instead of the built release ZIP
Configured enableReleaseAssets() with a pattern match for llms-amplifier.zip

Version 2.1.1 — Bug Fixes & Defensive Programming

Released June 2025

All class instantiations now check for class existence before loading, preventing fatal errors from missing files
Graceful degradation — when integration classes are missing, the plugin logs errors but continues operating
Atomic file write operations ensure LLMS files are either fully written or not written at all
Optimized database operations to avoid performance issues on large datasets
Comprehensive and consistent path validation throughout the codebase

Version 2.1.0 — WooCommerce & ACF Integration

Released June 2025

A major feature release adding deep integration with two of the most popular WordPress ecosystems.

WooCommerce Integration

Product prices, SKUs, and stock status included in LLMS output
Product attributes and specifications extracted and formatted
Featured products catalog section for prominent product listings
Configurable product limit to control output size
Privacy-first approach — customer and order data is completely excluded

Advanced Custom Fields (ACF) Integration

Automatic field detection and extraction across all post types
Support for 20+ ACF field types including text, textarea, number, select, checkbox, radio, date picker, and more
Flexible content and repeater field handling with configurable item limits
Field group structure documentation in generated output
Privacy controls — ability to exclude specific sensitive fields by name
ACF Pro feature detection

Other Improvements

New settings migration system for smooth upgrades from previous versions
Integration health checks with admin dashboard status display
Configurable security log retention (default: 1,000 entries)

New Files: class-llms-amplifier-woocommerce.php, class-llms-amplifier-acf.php

Version 2.0.6 — UTF-8 Encoding & Modular Architecture

Released June 2025

A significant architectural overhaul that resolved persistent character encoding issues and split the plugin into a maintainable modular structure.

UTF-8 Encoding Fixes

Implemented the proven v1.1.1 encoding approach — applying ensure_utf8_content() to every piece of content at the point of retrieval, not just at final output
Added UTF-8 BOM (Byte Order Mark) to all generated files for proper encoding detection
Fixed Nordic and special character handling (æ, ø, å, etc.)
Expanded character replacement map for double-encoded content

Modular Architecture

Split monolithic single-file plugin into dedicated class files:
- class-llms-amplifier-core.php — Core functionality and routing
- class-llms-amplifier-admin.php — Admin interface
- class-llms-amplifier-content-generator.php — Content generation
- class-llms-amplifier-security-logger.php — Security event logging
- class-llms-amplifier-utf8-handler.php — UTF-8 encoding handling
Each file kept under 1,000 lines for maintainability
Introduced singleton pattern for the core class and UTF-8 handler

Version 2.0.5 — Simplified UTF-8 Encoding

Released June 2025

Simplified UTF-8 encoding handling for better reliability
Fixed double-encoding issues with international characters
More efficient content processing pipeline

Version 2.0.4 — UTF-8 Refinements

Released June 2025

Further improvements to UTF-8 handling
Enhanced character encoding detection
Fixed edge cases in content extraction
Fixed PHP parse error in the character mapping array (malformed entry for the Ñ character)

Version 2.0.0 — Enhanced Security Edition

Released June 2025

A complete security overhaul of the plugin, addressing vulnerabilities identified in a comprehensive third-party security review.

Critical Security Fixes

Fixed CSRF vulnerabilities in all AJAX handlers with action-specific nonce verification
Resolved path traversal vulnerabilities with comprehensive validation, whitelist-based character filtering, length limits, and dangerous pattern detection
Enhanced input validation and sanitization across all user inputs
Improved output escaping throughout the admin interface using esc_html(), esc_url(), esc_attr(), and wp_kses_post()
SQL injection prevention through prepared statements

New Security Features

Comprehensive security event logging to a dedicated database table (wp_llms_amplifier_security_logs)
Tracking of failed authentication attempts, path validation failures, AJAX access attempts, file operations, and configuration changes
Content Security Policy, X-Content-Type-Options, X-Frame-Options, and Referrer Policy headers
Explicit file permissions (0644) on all generated files
IP address validation and logging for sensitive operations

Multilingual Support

Full UTF-8 encoding support with 70+ language detection
Custom language and charset override settings
Automatic language detection from WordPress locale

Other Improvements

Better multisite support and per-site isolation
Enhanced SEO plugin integrations (Yoast and RankMath)
Improved error handling without information disclosure
Real-time path validation in the admin interface

Version 1.2.0

Released May 2025

Basic LLMS file generation functionality
Initial multisite support
SEO plugin integration (Yoast and RankMath)
Subdirectory support for section-specific LLMS files

Version 1.0.0 — Initial Release

Released May 24, 2025

The first public release of LLMS Amplifier.

Automatic generation of llms.txt (overview) and llms-full.txt (detailed content) files
Content selection by post type with configurable post limits
Smart excerpts with configurable word limits and metadata inclusion
Custom content areas (headers and footers) for both files with persistence through regeneration
Scheduled automatic regeneration (immediate, daily, weekly, or manual)
SEO sitemap generation (llms-sitemap.xml) compatible with Yoast SEO and Rank Math
robots.txt integration
Subdirectory support for creating section-specific LLMS files (e.g., /blog/llms.txt)
Admin dashboard with file regeneration and settings management
WordPress 5.8+ and PHP 7.4+ required

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