feat(core): expose mcp prompts as commands

packages/core/src/plugin/mcp-command.ts

@@ -0,0 +1,33 @@
+export * as McpCommandPlugin from "./mcp-command"
+
+import { McpEvent } from "@opencode-ai/schema/mcp-event"
+import { Effect, Stream } from "effect"
+import { EventV2 } from "../event"
+import { MCP } from "../mcp"
+import { define } from "./internal"
+
+export const Plugin = define({
+  id: "mcp-command",
+  effect: Effect.fn(function* (ctx) {
+    const mcp = yield* MCP.Service
+    const events = yield* EventV2.Service
+    yield* ctx.command.transform(
+      Effect.fn(function* (draft) {
+        for (const prompt of yield* mcp.prompts()) {
+          draft.update(commandName(prompt), (command) => {
+            command.template = ""
+            command.description = prompt.description
+            command.source = "mcp"
+          })
+        }
+      }),
+    )
+    yield* events
+      .subscribe(McpEvent.PromptsChanged)
+      .pipe(Stream.runForEach(() => ctx.command.reload()), Effect.forkScoped({ startImmediately: true }))
+  }),
+})
+
+const commandName = (prompt: MCP.Prompt) => `${sanitize(prompt.server)}:${sanitize(prompt.name)}`
+
+const sanitize = (value: string) => value.replace(/[^a-zA-Z0-9_-]/g, "_")