Slack: consolidate message tool discovery

src/channels/plugins/slack.actions.ts

@@ -8,7 +8,7 @@ import {
   handleSlackMessageAction,
 } from "../../plugin-sdk/slack.js";
 import { createSlackMessageToolBlocksSchema } from "./message-tool-schema.js";
-import type { ChannelMessageActionAdapter } from "./types.js";
+import type { ChannelMessageActionAdapter, ChannelMessageToolDiscovery } from "./types.js";
 
 type SlackActionInvoke = (
   action: Record<string, unknown>,
@@ -20,26 +20,34 @@ export function createSlackActions(
   providerId: string,
   options?: { invoke?: SlackActionInvoke },
 ): ChannelMessageActionAdapter {
-  return {
-    listActions: ({ cfg }) => listSlackMessageActions(cfg),
-    getCapabilities: ({ cfg }) => {
-      const capabilities = new Set<"interactive" | "blocks">();
-      if (listSlackMessageActions(cfg).includes("send")) {
-        capabilities.add("blocks");
-      }
-      if (isSlackInteractiveRepliesEnabled({ cfg })) {
-        capabilities.add("interactive");
-      }
-      return Array.from(capabilities);
-    },
-    getToolSchema: ({ cfg }) =>
-      listSlackMessageActions(cfg).includes("send")
+  function describeMessageTool({
+    cfg,
+  }: Parameters<
+    NonNullable<ChannelMessageActionAdapter["describeMessageTool"]>
+  >[0]): ChannelMessageToolDiscovery {
+    const actions = listSlackMessageActions(cfg);
+    const capabilities = new Set<"blocks" | "interactive">();
+    if (actions.includes("send")) {
+      capabilities.add("blocks");
+    }
+    if (isSlackInteractiveRepliesEnabled({ cfg })) {
+      capabilities.add("interactive");
+    }
+    return {
+      actions,
+      capabilities: Array.from(capabilities),
+      schema: actions.includes("send")
         ? {
             properties: {
               blocks: createSlackMessageToolBlocksSchema(),
             },
           }
         : null,
+    };
+  }
+
+  return {
+    describeMessageTool,
     extractToolSend: ({ args }) => extractSlackToolSend(args),
     handleAction: async (ctx) => {
       return await handleSlackMessageAction({