feat(core): add completion support for MCP tools and refactor related classes

- Add completion field to AgentTool class
- Update McpFunctionProvider to include completion data
- Refactor CustomMcpServerManager to use a single Client instance
- Modify DevInsCompiler to use codeText() instead of text
- Update ToolchainCommandCompletion to handle MCP tools differently

Author: phodal

core/src/main/kotlin/cc/unitmesh/devti/agent/tool/AgentTool.kt

@@ -7,7 +7,8 @@ import kotlinx.serialization.Serializable
 data class AgentTool(
     override val name: String, override val description: String,
     val example: String,
-    val isMcp: Boolean = false
+    val isMcp: Boolean = false,
+    val completion: String = "",
 ) : Tool {
     override fun toString(): String {
         val string = if (description.isEmpty()) "" else """desc: $description"""

core/src/main/kotlin/cc/unitmesh/devti/mcp/client/CustomMcpServerManager.kt

@@ -44,12 +44,7 @@ class CustomMcpServerManager(val project: Project) {
                 return@mapNotNull null
             }
 
-            val client = Client(
-                clientInfo = Implementation(
-                    name = it.key,
-                    version = "1.0.0"
-                )
-            )
+            val client = Client(clientInfo = Implementation(name = it.key, version = "1.0.0"))
 
             val processBuilder = ProcessBuilder(it.value.command, *it.value.args.toTypedArray())
             val process = processBuilder.start()

core/src/main/kotlin/cc/unitmesh/devti/mcp/client/McpFunctionProvider.kt

@@ -24,7 +24,8 @@ class McpFunctionProvider : ToolchainFunctionProvider {
                 it.name,
                 it.description ?: "",
                 "Here is command and JSON schema\n/${it.name}\n```json\n$encodeToString\n```",
-                isMcp = true
+                isMcp = true,
+                completion = encodeToString
             )
         }
     }

exts/devins-lang/src/main/kotlin/cc/unitmesh/devti/language/compiler/DevInsCompiler.kt

@@ -347,7 +347,7 @@ class DevInsCompiler(
         prop: String,
         provider: ToolchainFunctionProvider
     ): PrintInsCommand {
-        val codeContent: String? = lookupNextCode(used)?.text
+        val codeContent: String? = lookupNextCode(used)?.codeText()
         val args = if (codeContent != null) {
             val code = CodeFence.parse(codeContent).text
             listOf(code)

exts/devins-lang/src/main/kotlin/cc/unitmesh/devti/language/completion/provider/ToolchainCommandCompletion.kt

@@ -24,12 +24,18 @@ class ToolchainCommandCompletion : CompletionProvider<CompletionParameters>() {
     }
 
     private fun createCommandCompletionCandidate(tool: AgentTool): LookupElement {
-        val icon = if (tool.isMcp) {
-            AutoDevIcons.MCP
-        } else {
-            AutoDevIcons.TOOLCHAIN
+        if (!tool.isMcp) {
+            val element = LookupElementBuilder.create(tool.name).withIcon(AutoDevIcons.TOOLCHAIN)
+            return PrioritizedLookupElement.withPriority(element, 98.0)
         }
 
-        return PrioritizedLookupElement.withPriority(LookupElementBuilder.create(tool.name).withIcon(icon), 98.0)
+        val element = LookupElementBuilder.create(tool.name).withIcon(AutoDevIcons.MCP)
+            .withTailText(tool.description)
+            .withInsertHandler { context, _ ->
+                context.editor.caretModel.moveToOffset(context.tailOffset)
+                context.editor.document.insertString(context.tailOffset, tool.completion)
+            }
+
+        return PrioritizedLookupElement.withPriority(element, 97.0)
     }
 }