// Complete reference of all hooks (actions and filters) available in Klytos CMS for intercepting and extending functionality. Use when hooking into Klytos events, modifying behavior through filters, adding custom behavior at lifecycle points, or understanding the hook system and priorities.
Guide for developing and maintaining Klytos CMS core. Use when modifying core files, adding MCP tools, fixing bugs, extending the core architecture, changing the build engine, modifying the installer, implementing hooks, or working with storage backends. Covers foundational principles (AI-first, privacy by design, security by default), architecture, boot sequence, manager pattern, MCP tool registration, and security checklist.
Complete guide for developing Klytos CMS plugins including structure, entry points, MCP tools, admin pages, hooks, routes, and best practices. Use when creating, modifying, extending Klytos functionality, adding MCP tools, admin pages, hooks, filters, or debugging plugins.
Complete reference of CSS design tokens, component classes, utility classes, and frontend styling in Klytos CMS. Use when building content, plugins, or admin templates that need consistent styling without hardcoding colors or writing custom CSS.
Guide for creating custom page templates, template parts, hook points, reusable blocks, and page template recipes in Klytos CMS. Use when creating new page layout templates, customizing template parts, adding frontend hook points, defining reusable blocks with slots, or building page template recipes combining multiple blocks.
Reference of all global helper functions available in Klytos CMS. Use when developing plugins, extending the CMS, accessing core services, checking permissions, generating URLs, logging messages, or calling any klytos_* global function from PHP code.
Guide for saving and retrieving plugin options and site configuration in Klytos CMS. Use when a plugin needs to store or read persistent settings, manage site configuration, retrieve options, save persistent key-value data, work with the Options API, Site Config, or Storage API, manage plugin settings, query options by domain, or clean up options during plugin uninstall.
| name | Klytos Hooks Reference |
| description | Complete reference of all hooks (actions and filters) available in Klytos CMS for intercepting and extending functionality. Use when hooking into Klytos events, modifying behavior through filters, adding custom behavior at lifecycle points, or understanding the hook system and priorities. |
| Actions | Filters | |
|---|---|---|
| Purpose | Execute code at specific points | Modify and return data |
| Return | None (void) | Modified value |
| Register | klytos_add_action() | klytos_add_filter() |
| Fire | klytos_do_action() | klytos_apply_filters() |
klytos_add_action(string $hook, callable $callback, int $priority = 10): void
klytos_do_action(string $hook, mixed ...$args): void
klytos_add_filter(string $hook, callable $callback, int $priority = 10): void
klytos_apply_filters(string $hook, mixed $value, mixed ...$args): mixed
klytos_remove_action(string $hook, callable $callback): bool
klytos_remove_filter(string $hook, callable $callback): bool
klytos_has_action(string $hook): bool
klytos_has_filter(string $hook): bool
klytos_remove_all_actions(string $hook): void
klytos_remove_all_filters(string $hook): void
klytos_did_action(string $hook): int // Times action was fired
klytos_get_fired_actions(): array // ['hook' => fire_count, ...]
klytos_get_registered_hooks(): array // ['actions' => ['hook' => count], 'filters' => [...]]
IMPORTANT: ALWAYS use the global
klytos_*functions. NEVER useHooks::class methods directly. TheHooksclass is an internal engine — plugins and core code must use theklytos_*wrappers.
klytos_current_admin_page(): string // 'settings', 'users', 'dashboard', etc.
klytos_is_admin_page(string $page): bool // Exact ('settings') or prefix ('settings.*')
page.before_save, page.after_save, page.before_delete, page.after_delete (actions)page.content (filter)build.before, build.after, build.page.before, build.page.after (actions)build.page.output, build.head_html, build.body_end_html, build.sitemap_urls (filters)build.llms_generated (action) — after llms.txt + llms-full.txt + .html.md are generated, receives $stats arraybuild.llms_txt (filter) — modify llms.txt content before writingbuild.llms_full_txt (filter) — modify llms-full.txt content before writingbuild.page_markdown (filter) — modify per-page Markdown before writing .html.md, receives ($md, $page)build.llms_pages (filter) — modify/reorder/add pages array for LLM file generationmcp.tools_list (filter) — register new toolsmcp.handle_tool (filter) — handle tool callsmcp.tool_response (filter) — modify responsesmcp.tool_called (action) — tool was calledauth.before_login, auth.after_login (actions)auth.capabilities (filter)admin.sidebar_items (filter) — customize sidebaradmin.head, admin.footer (actions)admin.{page}.before, admin.{page}.after (actions)block.before_save, block.after_save (actions)block.rendered_html (filter)page_template.before_save, page_template.after_save, page_template.approved (actions)plugin.activated, plugin.deactivated (actions)plugin.loaded, plugin.installed (actions)installer/core/hooks.phpinstaller/core/helpers-global.phpFor the complete hook catalog with all arguments and sources, see the references/complete-hooks.md file.