Slack: add header and context blocks to arg menus

src/slack/monitor/slash.test.ts

@@ -167,6 +167,12 @@ function encodeValue(parts: { command: string; arg: string; value: string; userI
   ].join("|");
 }
 
+function findFirstActionsBlock(payload: { blocks?: Array<{ type: string }> }) {
+  return payload.blocks?.find((block) => block.type === "actions") as
+    | { type: string; elements?: Array<{ type?: string; action_id?: string }> }
+    | undefined;
+}
+
 function createArgMenusHarness() {
   const commands = new Map<string, (args: unknown) => Promise<void>>();
   const actions = new Map<string, (args: unknown) => Promise<void>>();
@@ -281,10 +287,11 @@ describe("Slack native command argument menus", () => {
 
     expect(respond).toHaveBeenCalledTimes(1);
     const payload = respond.mock.calls[0]?.[0] as { blocks?: Array<{ type: string }> };
-    expect(payload.blocks?.[0]?.type).toBe("section");
-    expect(payload.blocks?.[1]?.type).toBe("actions");
-    const elementType = (payload.blocks?.[1] as { elements?: Array<{ type?: string }> } | undefined)
-      ?.elements?.[0]?.type;
+    expect(payload.blocks?.[0]?.type).toBe("header");
+    expect(payload.blocks?.[1]?.type).toBe("section");
+    expect(payload.blocks?.[2]?.type).toBe("context");
+    const actions = findFirstActionsBlock(payload);
+    const elementType = actions?.elements?.[0]?.type;
     expect(elementType).toBe("button");
   });
 
@@ -307,11 +314,11 @@ describe("Slack native command argument menus", () => {
 
     expect(respond).toHaveBeenCalledTimes(1);
     const payload = respond.mock.calls[0]?.[0] as { blocks?: Array<{ type: string }> };
-    expect(payload.blocks?.[0]?.type).toBe("section");
-    expect(payload.blocks?.[1]?.type).toBe("actions");
-    const element = (
-      payload.blocks?.[1] as { elements?: Array<{ type?: string; action_id?: string }> } | undefined
-    )?.elements?.[0];
+    expect(payload.blocks?.[0]?.type).toBe("header");
+    expect(payload.blocks?.[1]?.type).toBe("section");
+    expect(payload.blocks?.[2]?.type).toBe("context");
+    const actions = findFirstActionsBlock(payload);
+    const element = actions?.elements?.[0];
     expect(element?.type).toBe("static_select");
     expect(element?.action_id).toBe("openclaw_cmdarg");
   });
@@ -335,10 +342,8 @@ describe("Slack native command argument menus", () => {
 
     expect(respond).toHaveBeenCalledTimes(1);
     const payload = respond.mock.calls[0]?.[0] as { blocks?: Array<{ type: string }> };
-    expect(payload.blocks?.[1]?.type).toBe("actions");
-    const firstElement = (
-      payload.blocks?.[1] as { elements?: Array<{ type?: string }> } | undefined
-    )?.elements?.[0];
+    const actions = findFirstActionsBlock(payload);
+    const firstElement = actions?.elements?.[0];
     expect(firstElement?.type).toBe("button");
   });
 
@@ -361,10 +366,8 @@ describe("Slack native command argument menus", () => {
 
     expect(respond).toHaveBeenCalledTimes(1);
     const payload = respond.mock.calls[0]?.[0] as { blocks?: Array<{ type: string }> };
-    expect(payload.blocks?.[1]?.type).toBe("actions");
-    const element = (
-      payload.blocks?.[1] as { elements?: Array<{ type?: string; action_id?: string }> } | undefined
-    )?.elements?.[0];
+    const actions = findFirstActionsBlock(payload);
+    const element = actions?.elements?.[0];
     expect(element?.type).toBe("overflow");
     expect(element?.action_id).toBe("openclaw_cmdarg");
   });

src/slack/monitor/slash.ts

@@ -34,6 +34,18 @@ const SLACK_COMMAND_ARG_OVERFLOW_MIN = 3;
 const SLACK_COMMAND_ARG_OVERFLOW_MAX = 5;
 const SLACK_COMMAND_ARG_SELECT_OPTIONS_MAX = 100;
 const SLACK_COMMAND_ARG_SELECT_OPTION_VALUE_MAX = 75;
+const SLACK_HEADER_TEXT_MAX = 150;
+
+function truncatePlainText(value: string, max: number): string {
+  const trimmed = value.trim();
+  if (trimmed.length <= max) {
+    return trimmed;
+  }
+  if (max <= 1) {
+    return trimmed.slice(0, max);
+  }
+  return `${trimmed.slice(0, max - 1)}…`;
+}
 
 type CommandsRegistry = typeof import("../../auto-reply/commands-registry.js");
 let commandsRegistry: CommandsRegistry | undefined;
@@ -164,10 +176,27 @@ function buildSlackCommandArgMenuBlocks(params: {
             },
           ],
         }));
+  const headerText = truncatePlainText(
+    `/${params.command}: choose ${params.arg}`,
+    SLACK_HEADER_TEXT_MAX,
+  );
+  const sectionText = truncatePlainText(params.title, 3000);
+  const contextText = truncatePlainText(
+    `Select one option to continue /${params.command} (${params.arg})`,
+    3000,
+  );
   return [
+    {
+      type: "header",
+      text: { type: "plain_text", text: headerText },
+    },
     {
       type: "section",
-      text: { type: "mrkdwn", text: params.title },
+      text: { type: "mrkdwn", text: sectionText },
+    },
+    {
+      type: "context",
+      elements: [{ type: "mrkdwn", text: contextText }],
     },
     ...rows,
   ];