feat(plugins): tool MCP agent-facing idea_plugin_install_from_directory + reload couvrant le refresh UI — backend #279 (use case InstallPluginFromDirectory avec expectedPluginId, confinement répertoire sous project root: rejet absolu hors root/fichier/symlink escaping, soft refresh + événements plugin_installed/plugin_reloaded relayés, wiring app-tauri; QA verte ré-exécutée: application 2/2 directory_install, infrastructure mcp_server 39/39 dont routing plugin_install/plugin_reload, plugin_install_load 5/5)

crates/infrastructure/src/orchestrator/mcp/plugins.rs

@@ -49,23 +49,41 @@ pub trait PluginToolProvider: Send + Sync {
 /// Returns true when `name` is a public plugin tool.
 #[must_use]
 pub fn is_plugin_tool(name: &str) -> bool {
-    name == "idea_plugin_reload"
+    matches!(
+        name,
+        "idea_plugin_install_from_directory" | "idea_plugin_reload"
+    )
 }
 
 /// Public plugin tool definitions advertised by `tools/list`.
 #[must_use]
 pub fn catalogue() -> Vec<ToolDef> {
-    vec![ToolDef {
-        name: "idea_plugin_reload",
-        description: "Hot-reload an installed directory plugin from its recorded source.",
-        input_schema: json!({
-            "type": "object",
-            "properties": {
-                "pluginId": { "type": "string" },
-                "expectedContentHash": { "type": "string" }
-            },
-            "required": ["pluginId"],
-            "additionalProperties": false
-        }),
-    }]
+    vec![
+        ToolDef {
+            name: "idea_plugin_install_from_directory",
+            description: "Install a plugin from a directory confined to the requester project root; the emitted event lets the UI refresh plugin contributions without restarting IdeA.",
+            input_schema: json!({
+                "type": "object",
+                "properties": {
+                    "path": { "type": "string" },
+                    "expectedPluginId": { "type": "string" }
+                },
+                "required": ["path"],
+                "additionalProperties": false
+            }),
+        },
+        ToolDef {
+            name: "idea_plugin_reload",
+            description: "Hot-reload an installed directory plugin from its recorded source; the emitted event lets the UI refresh plugin contributions.",
+            input_schema: json!({
+                "type": "object",
+                "properties": {
+                    "pluginId": { "type": "string" },
+                    "expectedContentHash": { "type": "string" }
+                },
+                "required": ["pluginId"],
+                "additionalProperties": false
+            }),
+        },
+    ]
 }

crates/infrastructure/src/orchestrator/mcp/tools.rs

@@ -96,6 +96,7 @@ pub const WRITE_ACTION_TOOLS: &[&str] = &[
     "idea_managed_temp_allocate",
     "idea_managed_temp_release",
     "idea_managed_temp_gc",
+    "idea_plugin_install_from_directory",
     "idea_plugin_reload",
 ];