Add read_messages tool and conversational task prompts

Agents now have a read_messages tool to check their inbox and channel
history during runs, enabling them to catch up on conversation before
acting. Task prompts are rewritten to encourage checking messages first
and discussing work with teammates rather than posting status updates.

AgentCompany-New/src/main/services/agent-tools.ts

@@ -110,6 +110,19 @@ export const AGENT_TOOLS: ToolDefinition[] = [
       required: ["channel", "body"],
     },
   },
+  {
+    name: "read_messages",
+    description: "Read recent messages from a channel or your direct mentions. Check what your teammates have been saying before you respond or start work.",
+    parameters: {
+      type: "object",
+      additionalProperties: false,
+      properties: {
+        channel: { type: "string", description: "Channel name: 'engineering', 'product', 'general'. Omit to read your recent @mentions across all channels." },
+        limit: { type: "number", description: "Number of recent messages (default 10, max 30)." },
+      },
+      required: [],
+    },
+  },
   {
     name: "create_document",
     description: "Create a company document (PRD, spec, memo, report, runbook, proposal, policy, guide). Use this for structured deliverables that the company should keep versioned.",
@@ -144,6 +157,8 @@ export function dispatchAgentTool(
         return writeDeliverableTool(deps, ctx, call.arguments);
       case "send_message":
         return sendMessageTool(deps, ctx, call.arguments);
+      case "read_messages":
+        return readMessagesTool(deps, ctx, call.arguments);
       case "create_document":
         return createDocumentTool(deps, ctx, call.arguments);
       default:
@@ -334,6 +349,45 @@ function joinNames(names: string[]): string {
   return `${names.slice(0, -1).join(", ")}, and ${names[names.length - 1]}`;
 }
 
+function readMessagesTool(deps: AgentToolDeps, ctx: AgentToolContext, args: JsonRecord): string {
+  const channel = optionalString(args.channel);
+  const limit = Math.min(Math.max(Number(args.limit) || 10, 1), 30);
+  if (channel) {
+    const space = deps.db.prepare(
+      "select id from chat_spaces where org_id = ? and lower(name) = lower(?) and space_type <> 'direct' limit 1",
+    ).get(ctx.orgId, channel) as { id: string } | undefined;
+    if (!space) throw new Error(`No channel named "${channel}".`);
+    const rows = deps.db.prepare(`
+      select m.body_md,
+             coalesce(a.name, e.display_name, m.sender_type) as sender_name,
+             m.thread_id
+      from chat_messages m
+      left join agents a on a.id = m.sender_id and m.sender_type = 'agent'
+      left join employees e on e.id = m.sender_id and m.sender_type = 'employee'
+      where m.space_id = ? and m.org_id = ? and m.deleted_at is null
+      order by m.created_at desc
+      limit ?
+    `).all(space.id, ctx.orgId, limit) as Array<{ body_md: string; sender_name: string; thread_id: string }>;
+    if (rows.length === 0) return `No recent messages in #${channel}.`;
+    return rows.reverse().map((m) => `[${m.sender_name}] (thread=${m.thread_id}): ${m.body_md}`).join("\n");
+  }
+  const rows = deps.db.prepare(`
+    select m.body_md,
+           coalesce(a.name, e.display_name, m.sender_type) as sender_name,
+           m.thread_id, s.name as channel_name
+    from chat_mentions cm
+    join chat_messages m on m.id = cm.message_id
+    join chat_spaces s on s.id = m.space_id
+    left join agents a on a.id = m.sender_id and m.sender_type = 'agent'
+    left join employees e on e.id = m.sender_id and m.sender_type = 'employee'
+    where cm.target_type = 'agent' and cm.target_id = ? and m.org_id = ? and m.deleted_at is null
+    order by m.created_at desc
+    limit ?
+  `).all(ctx.agent.id, ctx.orgId, limit) as Array<{ body_md: string; sender_name: string; thread_id: string; channel_name: string }>;
+  if (rows.length === 0) return "No recent mentions.";
+  return rows.reverse().map((m) => `[${m.sender_name} in #${m.channel_name}] (thread=${m.thread_id}): ${m.body_md}`).join("\n");
+}
+
 function createDocumentTool(deps: AgentToolDeps, ctx: AgentToolContext, args: JsonRecord): string {
   const title = requireString(args.title, "title");
   const docType = requireString(args.doc_type, "doc_type");