Slack: support Block Kit blocks in editMessage

src/agents/tools/slack-actions.e2e.test.ts

@@ -207,6 +207,55 @@ describe("handleSlackAction", () => {
     ).rejects.toThrow(/requires content, blocks, or mediaUrl/i);
   });
 
+  it("passes blocks JSON to editSlackMessage with empty content", async () => {
+    const cfg = { channels: { slack: { botToken: "tok" } } } as OpenClawConfig;
+    editSlackMessage.mockClear();
+    await handleSlackAction(
+      {
+        action: "editMessage",
+        channelId: "C123",
+        messageId: "123.456",
+        blocks: JSON.stringify([{ type: "section", text: { type: "mrkdwn", text: "Updated" } }]),
+      },
+      cfg,
+    );
+    expect(editSlackMessage).toHaveBeenCalledWith("C123", "123.456", "", {
+      blocks: [{ type: "section", text: { type: "mrkdwn", text: "Updated" } }],
+    });
+  });
+
+  it("passes blocks arrays to editSlackMessage", async () => {
+    const cfg = { channels: { slack: { botToken: "tok" } } } as OpenClawConfig;
+    editSlackMessage.mockClear();
+    await handleSlackAction(
+      {
+        action: "editMessage",
+        channelId: "C123",
+        messageId: "123.456",
+        blocks: [{ type: "divider" }],
+      },
+      cfg,
+    );
+    expect(editSlackMessage).toHaveBeenCalledWith("C123", "123.456", "", {
+      blocks: [{ type: "divider" }],
+    });
+  });
+
+  it("requires content or blocks for editMessage", async () => {
+    const cfg = { channels: { slack: { botToken: "tok" } } } as OpenClawConfig;
+    await expect(
+      handleSlackAction(
+        {
+          action: "editMessage",
+          channelId: "C123",
+          messageId: "123.456",
+          content: "",
+        },
+        cfg,
+      ),
+    ).rejects.toThrow(/requires content or blocks/i);
+  });
+
   it("auto-injects threadTs from context when replyToMode=all", async () => {
     const cfg = { channels: { slack: { botToken: "tok" } } } as OpenClawConfig;
     sendSlackMessage.mockClear();

src/agents/tools/slack-actions.ts

@@ -231,13 +231,18 @@ export async function handleSlackAction(
         const messageId = readStringParam(params, "messageId", {
           required: true,
         });
-        const content = readStringParam(params, "content", {
+        const content = readStringParam(params, "content", { allowEmpty: true });
-          required: true,
+        const blocks = readSlackBlocksParam(params);
-        });
+        if (!content && !blocks) {
+          throw new Error("Slack editMessage requires content or blocks.");
+        }
         if (writeOpts) {
-          await editSlackMessage(channelId, messageId, content, writeOpts);
+          await editSlackMessage(channelId, messageId, content ?? "", {
+            ...writeOpts,
+            blocks,
+          });
         } else {
-          await editSlackMessage(channelId, messageId, content);
+          await editSlackMessage(channelId, messageId, content ?? "", { blocks });
         }
         return jsonResult({ ok: true });
       }

src/slack/actions.ts

@@ -167,13 +167,14 @@ export async function editSlackMessage(
   channelId: string,
   messageId: string,
   content: string,
-  opts: SlackActionClientOpts = {},
+  opts: SlackActionClientOpts & { blocks?: (Block | KnownBlock)[] } = {},
 ) {
   const client = await getClient(opts);
   await client.chat.update({
     channel: channelId,
     ts: messageId,
-    text: content,
+    text: content || " ",
+    ...(opts.blocks?.length ? { blocks: opts.blocks } : {}),
   });
 }