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<?php |
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defined( 'ABSPATH' ) || exit; |
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/** |
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* Desktop Mode — AI tool registration API. |
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* |
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* Third-party plugins register server-side tools the AI Copilot can |
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* invoke during a `/ai/search` call. Mirrors every other |
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* registration API in this plugin (`desktop_mode_register_window`, |
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* `desktop_mode_register_wallpaper`, `desktop_mode_register_widget`). |
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* |
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* Tools registered here are *PHP-dispatched* — the tool's `handler` |
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* runs on the server, returns a JSON-serialisable array, and the |
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* result is fed straight back to the OpenAI agent loop. This is the |
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* right home for integrations that are inherently server-side: |
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* site-health checks, WooCommerce lookups, WP-CLI wrappers, any |
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* database-heavy query. |
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* |
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* JS-owned tools (plugin slash-commands) take a different path — the |
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* shell harvests the command registry client-side, passes metadata |
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* to the AI as tools, receives a `tool_call` answer_type back, and |
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* invokes the command's `run()` locally. See `src/ai/ask.ts`. |
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* |
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* Example: |
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* |
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* ```php |
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* desktop_mode_register_ai_tool( array( |
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* 'name' => 'list_recent_orders', |
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* 'description' => 'List the site\'s most recent WooCommerce orders.', |
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* 'parameters' => array( |
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* 'type' => 'object', |
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* 'properties' => array( |
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* 'limit' => array( 'type' => 'integer' ), |
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* 'status' => array( 'type' => 'string', 'enum' => array( 'processing', 'completed' ) ), |
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* ), |
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* 'required' => array( 'limit' ), |
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* ), |
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* 'handler' => 'my_plugin_list_orders', |
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* 'capability' => 'manage_woocommerce', |
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* 'progress_message' => 'Checking recent orders…', |
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* ) ); |
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* ``` |
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* |
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* Handlers receive `( array $args, int $user_id )` and return |
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* `array|WP_Error`. A thrown exception is caught, reported via the |
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* `desktop_mode_ai_search_error` action, and relayed to the model as a |
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* structured `{ error: ... }` tool result; a `WP_Error` return is |
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* relayed to the model the same way (without firing the action) so the |
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* agent can decide whether to try another tool. |
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* |
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* @since 0.5.1 |
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* @package WPDesktopMode |
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*/ |
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|
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/** |
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* Register a server-side AI tool. |
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* |
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* @since 0.5.1 |
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* |
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* @param array $args { |
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* @type string $name Unique tool name, `[a-z0-9_]+` (1-64 chars). |
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* Namespace with your plugin prefix — e.g. `woocommerce_list_orders`. |
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* Required. |
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* @type string $description One-line description shown to the model as part of the tool spec. |
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* Required. |
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* @type array $parameters JSON-Schema object describing the tool's arguments. Follow the |
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* OpenAI function-calling shape — `{ type: "object", properties: {...}, |
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* required: [...] }`. Default `{ type: "object", properties: {} }` |
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* for tools that take no arguments (in PHP, use `(object) array()` or |
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* `new stdClass()` for `properties` so it JSON-encodes as an object, |
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* not an array). |
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* @type callable $handler `function( array $args, int $user_id ): array|WP_Error`. Return |
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* value is JSON-encoded and passed back to the model. Required. |
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* @type string $capability WordPress capability the current user must hold for the tool to |
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* be visible to the model. Checked BEFORE the tool is included in |
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* the request — unauthorised users never even see it exists. |
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* Default empty (visible to all logged-in users with AI enabled). |
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* @type string $progress_message Short phrase shown to the user while the tool runs (SSE progress |
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* events). Falls back to a generic "Working…" when empty. |
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* } |
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* @return true|WP_Error `true` on success, `WP_Error` on validation failure. |
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*/ |
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function desktop_mode_register_ai_tool( $args ) { |
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$defaults = array( |
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'name' => '', |
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'description' => '', |
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'parameters' => array( |
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'type' => 'object', |
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'properties' => (object) array(), |
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), |
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'handler' => null, |
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'capability' => '', |
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'progress_message' => '', |
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); |
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$args = wp_parse_args( $args, $defaults ); |
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|
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$name = (string) $args['name']; |
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if ( '' === $name || ! preg_match( '/^[a-z0-9_]{1,64}$/', $name ) ) { |
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return desktop_mode_registration_error( |
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'desktop_mode_ai_tool_invalid_name', |
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__( 'AI tool registration requires a `name` matching [a-z0-9_]{1,64}.', 'desktop-mode' ), |
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array( 'name' => $name ) |
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); |
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} |
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if ( '' === (string) $args['description'] ) { |
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return desktop_mode_registration_error( |
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'desktop_mode_ai_tool_missing_description', |
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__( 'AI tool registration requires a non-empty `description`.', 'desktop-mode' ), |
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array( 'name' => $name ) |
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); |
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} |
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if ( ! is_callable( $args['handler'] ) ) { |
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return desktop_mode_registration_error( |
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'desktop_mode_ai_tool_invalid_handler', |
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__( 'AI tool registration requires a callable `handler`.', 'desktop-mode' ), |
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array( 'name' => $name ) |
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); |
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} |
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if ( ! is_array( $args['parameters'] ) && ! is_object( $args['parameters'] ) ) { |
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return desktop_mode_registration_error( |
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'desktop_mode_ai_tool_invalid_parameters', |
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__( 'AI tool `parameters` must be a JSON-Schema object.', 'desktop-mode' ), |
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array( 'name' => $name ) |
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); |
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} |
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|
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$entry = array( |
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'name' => $name, |
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'description' => (string) $args['description'], |
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'parameters' => $args['parameters'], |
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'handler' => $args['handler'], |
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'capability' => (string) $args['capability'], |
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'progress_message' => (string) $args['progress_message'], |
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); |
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desktop_mode_desktop_ai_tool_registry( $name, $entry ); |
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|
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/** |
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* Fires after a desktop AI tool is successfully registered. |
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* |
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* @since 0.5.1 |
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* |
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* @param string $name The tool name. |
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* @param array $entry The stored registry entry (handler included). |
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*/ |
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do_action( 'desktop_mode_ai_tool_registered', $name, $entry ); |
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|
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return true; |
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} |
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|
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/** |
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* Internal module-level registry for AI tools declared via |
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* {@see desktop_mode_register_ai_tool()}. |
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* |
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* @since 0.5.1 |
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* @internal |
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* |
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* @param string $name Tool name to read or write. |
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* @param array|null $entry Entry to store, or `null` to read. |
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* @return array|null|array<string,array> |
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*/ |
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function desktop_mode_desktop_ai_tool_registry( $name = '', $entry = null ) { |
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static $store = array(); |
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|
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if ( '' === (string) $name ) { |
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return $store; |
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} |
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if ( null !== $entry ) { |
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$store[ (string) $name ] = $entry; |
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} |
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return isset( $store[ (string) $name ] ) ? $store[ (string) $name ] : null; |
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} |
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|
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/** |
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* Capability-filtered list of registered AI tools for the current user. |
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* |
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* Walks the registry and drops any tool whose `capability` the current |
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* user doesn't hold. The caller (the agent loop in search.php) later |
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* merges the result with the built-in and command tools and runs the |
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* combined list through the `desktop_mode_ai_tools` filter. |
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* |
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* @since 0.5.1 |
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* |
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* @param int $user_id User whose capabilities gate visibility. |
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* @return array[] List of tool entries with `handler` still attached — |
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* the caller is expected to strip `handler` before |
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* sending the definitions to OpenAI. |
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*/ |
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function desktop_mode_get_registered_ai_tools_for_user( $user_id ) { |
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$registry = desktop_mode_desktop_ai_tool_registry(); |
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if ( ! is_array( $registry ) || empty( $registry ) ) { |
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return array(); |
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} |
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|
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$user = $user_id > 0 ? get_user_by( 'id', $user_id ) : null; |
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$out = array(); |
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foreach ( $registry as $entry ) { |
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$cap = (string) ( $entry['capability'] ?? '' ); |
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if ( '' !== $cap && ( ! $user || ! user_can( $user, $cap ) ) ) { |
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continue; |
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} |
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$out[] = $entry; |
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} |
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return $out; |
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} |
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|
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/** |
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* Project a registered tool entry into the OpenAI function-calling |
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* tool definition shape. Strips the handler + internal metadata. |
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* |
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* @since 0.5.1 |
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* |
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* @param array $entry Registry entry. |
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* @return array OpenAI tool definition. |
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*/ |
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function desktop_mode_ai_tool_entry_to_definition( array $entry ) { |
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return array( |
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'type' => 'function', |
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'name' => (string) $entry['name'], |
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'description' => (string) $entry['description'], |
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'parameters' => $entry['parameters'], |
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); |
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} |
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|
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/** |
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* Invoke a registered tool's handler, translating exceptions and |
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* `WP_Error` returns into a structured error payload the model can |
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* reason about without aborting the run. |
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* |
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* @since 0.5.1 |
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* |
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* @param array $entry Registry entry (must include `handler`). |
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* @param array $args Decoded arguments from the model's tool call. |
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* @param int $user_id Current user (forwarded to the handler). |
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* @return array JSON-serialisable payload (error envelope on failure). |
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*/ |
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function desktop_mode_ai_invoke_registered_tool( array $entry, array $args, $user_id ) { |
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$name = (string) ( $entry['name'] ?? '' ); |
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try { |
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$result = call_user_func( $entry['handler'], $args, (int) $user_id ); |
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} catch ( \Throwable $e ) { |
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/** |
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* Fires when an AI tool handler throws. |
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* |
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* @since 0.5.1 |
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* |
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* @param array $error { code, message, data } scrubbed of |
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* exception internals. |
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* @param string $name Tool name that threw. |
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* @param \Throwable $e The caught exception. |
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*/ |
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do_action( |
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'desktop_mode_ai_search_error', |
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array( |
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'code' => 'desktop_mode_ai_tool_exception', |
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'message' => 'Tool handler threw.', |
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'data' => array( 'tool' => $name ), |
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), |
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$name, |
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$e |
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); |
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return array( |
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'error' => 'tool_exception', |
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'tool' => $name, |
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'message' => 'The tool failed. Try a different approach.', |
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); |
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} |
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|
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if ( is_wp_error( $result ) ) { |
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return array( |
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'error' => $result->get_error_code(), |
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'tool' => $name, |
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'message' => $result->get_error_message(), |
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); |
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} |
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if ( ! is_array( $result ) ) { |
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return array( |
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'error' => 'tool_bad_return', |
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'tool' => $name, |
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'message' => 'Handler did not return an array.', |
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); |
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} |
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return $result; |
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} |
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|
