v2.0.3: CLI client + human inbox + cost tracking + Boomerang new_task

Phase 7 of v2.0. BooCoder gains a terminal-driven UX and subagent
isolation primitive.

CLI (src/cli.ts): standalone entry point for terminal use.
- boocode run "task" [--agent x] [--model y] — create + stream output
- boocode ls [--state x] — formatted task table
- boocode attach <id> — WS stream of running task
- boocode send <id> "msg" — follow-up message to task session
Connects to BOOCODER_URL (default http://100.114.205.53:9502).

Human inbox (routes/inbox.ts): GET /api/inbox (failed/blocked tasks),
POST /api/inbox/:id/retry (reset to pending for re-dispatch).

Cost tracking: dispatcher aggregates tokens_used from all messages in
the task's session after completion, stores in tasks.cost_tokens.
GET /api/stats/costs?group_by=project|agent|day for aggregation.

Boomerang subagent isolation (3 new tools):
- new_task: creates child task with parent_task_id linkage, runs in
  fresh isolated session. Orchestrator sees only output_summary.
- list_tasks: query child tasks of current parent
- check_task_status: read task state + output_summary

The orchestrator pattern: an agent with tools: [new_task, list_tasks,
check_task_status] can ONLY dispatch — can't read files or MCP. This
is the Roo Code Boomerang Tasks capability-restriction principle.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/coder/src/services/dispatcher.ts

@@ -134,6 +134,14 @@ export function createDispatcher(deps: Deps): { start(): void; stop(): Promise<v
         return;
       }
 
+      // Aggregate token cost for the task's session
+      const [costRow] = await sql<{ total: number | null }[]>`
+        SELECT SUM(tokens_used)::int AS total
+        FROM messages
+        WHERE session_id = ${sessionId} AND tokens_used IS NOT NULL
+      `;
+      const costTokens = costRow?.total ?? null;
+
       if (finalStatus === 'complete') {
         const [msg] = await sql<{ content: string | null }[]>`
           SELECT content FROM messages WHERE id = ${assistantId}
@@ -141,10 +149,10 @@ export function createDispatcher(deps: Deps): { start(): void; stop(): Promise<v
         const summary = (msg?.content ?? '').slice(0, 500);
         await sql`
           UPDATE tasks
-          SET state = 'completed', ended_at = clock_timestamp(), output_summary = ${summary}
+          SET state = 'completed', ended_at = clock_timestamp(), output_summary = ${summary}, cost_tokens = ${costTokens}
           WHERE id = ${taskId}
         `;
-        log.info({ taskId }, 'dispatcher: task completed (native)');
+        log.info({ taskId, costTokens }, 'dispatcher: task completed (native)');
       } else {
         const [msg] = await sql<{ content: string | null }[]>`
           SELECT content FROM messages WHERE id = ${assistantId}
@@ -152,7 +160,7 @@ export function createDispatcher(deps: Deps): { start(): void; stop(): Promise<v
         const summary = (msg?.content ?? 'Inference failed').slice(0, 500);
         await sql`
           UPDATE tasks
-          SET state = 'failed', ended_at = clock_timestamp(), output_summary = ${summary}
+          SET state = 'failed', ended_at = clock_timestamp(), output_summary = ${summary}, cost_tokens = ${costTokens}
           WHERE id = ${taskId}
         `;
         log.warn({ taskId, finalStatus }, 'dispatcher: task failed (native)');
@@ -299,13 +307,21 @@ export function createDispatcher(deps: Deps): { start(): void; stop(): Promise<v
       // Step 4: Cleanup worktree
       await cleanupWorktree(projectPath, taskId);
 
-      // Step 5: Mark task completed
+      // Step 5: Aggregate token cost
+      const [extCostRow] = await sql<{ total: number | null }[]>`
+        SELECT SUM(tokens_used)::int AS total
+        FROM messages
+        WHERE session_id = ${sessionId} AND tokens_used IS NOT NULL
+      `;
+      const extCostTokens = extCostRow?.total ?? null;
+
+      // Step 6: Mark task completed
       await sql`
         UPDATE tasks
-        SET state = 'completed', ended_at = clock_timestamp(), output_summary = ${outputSummary}
+        SET state = 'completed', ended_at = clock_timestamp(), output_summary = ${outputSummary}, cost_tokens = ${extCostTokens}
         WHERE id = ${taskId}
       `;
-      log.info({ taskId, agent }, 'dispatcher: task completed (external)');
+      log.info({ taskId, agent, costTokens: extCostTokens }, 'dispatcher: task completed (external)');
 
     } catch (err) {
       const errMsg = err instanceof Error ? err.message : String(err);

apps/coder/src/services/tools/check_task_status.ts

@@ -0,0 +1,50 @@
+import { z } from 'zod';
+import type { ToolDef, ToolContext } from './types.js';
+
+const CheckTaskStatusInput = z.object({
+  task_id: z.string().uuid().describe('ID of the task to check'),
+});
+
+type CheckTaskStatusInputT = z.infer<typeof CheckTaskStatusInput>;
+
+export const checkTaskStatusTool: ToolDef<CheckTaskStatusInputT> = {
+  name: 'check_task_status',
+  description: 'Check the status and output of a subtask by ID. Returns state, output_summary, and timing.',
+  inputSchema: CheckTaskStatusInput,
+  jsonSchema: {
+    type: 'function',
+    function: {
+      name: 'check_task_status',
+      description: 'Check the status and output of a subtask by ID.',
+      parameters: {
+        type: 'object',
+        properties: {
+          task_id: { type: 'string', description: 'ID of the task to check' },
+        },
+        required: ['task_id'],
+      },
+    },
+  },
+
+  async execute(input: CheckTaskStatusInputT, _projectRoot: string, context: ToolContext): Promise<unknown> {
+    const { sql } = context;
+
+    const [task] = await sql<{ id: string; state: string; output_summary: string | null; started_at: string | null; ended_at: string | null }[]>`
+      SELECT id, state, output_summary, started_at, ended_at
+      FROM tasks
+      WHERE id = ${input.task_id}
+    `;
+
+    if (!task) {
+      return { error: `Task ${input.task_id} not found` };
+    }
+
+    return {
+      id: task.id,
+      state: task.state,
+      output_summary: task.output_summary,
+      started_at: task.started_at,
+      ended_at: task.ended_at,
+    };
+  },
+};

apps/coder/src/services/tools/index.ts

@@ -4,6 +4,9 @@ import { createFileTool } from './create_file.js';
 import { deleteFileTool } from './delete_file.js';
 import { applyPendingTool } from './apply_pending.js';
 import { rewindTool } from './rewind.js';
+import { newTaskTool } from './new_task.js';
+import { listTasksTool } from './list_tasks.js';
+import { checkTaskStatusTool } from './check_task_status.js';
 
 export type { ToolDef, ToolContext, ToolJsonSchema } from './types.js';
 
@@ -16,6 +19,11 @@ export const WRITE_TOOLS: readonly ToolDef<any>[] = [
   deleteFileTool,
   editFileTool,
   rewindTool,
+  // Boomerang subtask tools — orchestrator agents call these to spawn/monitor child tasks.
+  // An "Orchestrator" agent profile would whitelist [new_task, list_tasks, check_task_status].
+  newTaskTool,
+  listTasksTool,
+  checkTaskStatusTool,
 ];
 
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
@@ -23,4 +31,4 @@ export const WRITE_TOOLS_BY_NAME: ReadonlyMap<string, ToolDef<any>> = new Map(
   WRITE_TOOLS.map((t) => [t.name, t]),
 );
 
-export { editFileTool, createFileTool, deleteFileTool, applyPendingTool, rewindTool };
+export { editFileTool, createFileTool, deleteFileTool, applyPendingTool, rewindTool, newTaskTool, listTasksTool, checkTaskStatusTool };

apps/coder/src/services/tools/list_tasks.ts

@@ -0,0 +1,56 @@
+import { z } from 'zod';
+import type { ToolDef, ToolContext } from './types.js';
+import { getInferenceContext } from './inference_context.js';
+
+const ListTasksInput = z.object({
+  parent_task_id: z.string().uuid().optional().describe('Filter by parent task ID. Omit to list children of current task.'),
+});
+
+type ListTasksInputT = z.infer<typeof ListTasksInput>;
+
+export const listTasksTool: ToolDef<ListTasksInputT> = {
+  name: 'list_tasks',
+  description: 'List child tasks of the current task (or a specified parent). Returns id, state, input preview, and output_summary.',
+  inputSchema: ListTasksInput,
+  jsonSchema: {
+    type: 'function',
+    function: {
+      name: 'list_tasks',
+      description: 'List child tasks of the current task (or a specified parent).',
+      parameters: {
+        type: 'object',
+        properties: {
+          parent_task_id: { type: 'string', description: 'Filter by parent task ID. Omit to list children of current task.' },
+        },
+        required: [],
+      },
+    },
+  },
+
+  async execute(input: ListTasksInputT, _projectRoot: string, context: ToolContext): Promise<unknown> {
+    const { sql } = context;
+    const ctx = getInferenceContext();
+    const parentId = input.parent_task_id ?? ctx.taskId;
+
+    if (!parentId) {
+      return { tasks: [], note: 'No parent task context — not running inside a task.' };
+    }
+
+    const rows = await sql<{ id: string; state: string; input: string; output_summary: string | null }[]>`
+      SELECT id, state, input, output_summary
+      FROM tasks
+      WHERE parent_task_id = ${parentId}
+      ORDER BY created_at DESC
+      LIMIT 50
+    `;
+
+    return {
+      tasks: rows.map((r) => ({
+        id: r.id,
+        state: r.state,
+        input_preview: r.input.slice(0, 100),
+        output_summary: r.output_summary,
+      })),
+    };
+  },
+};

apps/coder/src/services/tools/new_task.ts

@@ -0,0 +1,65 @@
+import { z } from 'zod';
+import type { ToolDef, ToolContext } from './types.js';
+import { getInferenceContext } from './inference_context.js';
+
+const NewTaskInput = z.object({
+  input: z.string().min(1).describe('Task description for the child subtask'),
+  agent: z.string().optional().describe('Optional: dispatch to a specific agent'),
+  model: z.string().optional().describe('Optional: model override for the subtask'),
+});
+
+type NewTaskInputT = z.infer<typeof NewTaskInput>;
+
+export const newTaskTool: ToolDef<NewTaskInputT> = {
+  name: 'new_task',
+  description:
+    'Spawn a subtask that runs in isolation. The subtask gets its own session and ' +
+    'worktree. Use check_task_status to monitor progress. Only the output_summary is ' +
+    'accessible to the parent — full isolation (Boomerang pattern).',
+  inputSchema: NewTaskInput,
+  jsonSchema: {
+    type: 'function',
+    function: {
+      name: 'new_task',
+      description:
+        'Spawn a subtask that runs in isolation. The subtask gets its own session and ' +
+        'worktree. Use check_task_status to monitor progress.',
+      parameters: {
+        type: 'object',
+        properties: {
+          input: { type: 'string', description: 'Task description for the child subtask' },
+          agent: { type: 'string', description: 'Optional: dispatch to a specific agent' },
+          model: { type: 'string', description: 'Optional: model override for the subtask' },
+        },
+        required: ['input'],
+      },
+    },
+  },
+
+  async execute(input: NewTaskInputT, _projectRoot: string, context: ToolContext): Promise<unknown> {
+    const { sql } = context;
+    // Get the current task's project_id from the inference context
+    const ctx = getInferenceContext();
+    const currentTaskId = ctx.taskId;
+
+    // Look up the project_id from the current session
+    const [session] = await sql<{ project_id: string }[]>`
+      SELECT project_id FROM sessions WHERE id = ${ctx.sessionId}
+    `;
+    if (!session) {
+      return { error: 'Cannot determine project_id from current session' };
+    }
+
+    const [task] = await sql<{ id: string; state: string }[]>`
+      INSERT INTO tasks (project_id, parent_task_id, input, agent, model)
+      VALUES (${session.project_id}, ${currentTaskId}, ${input.input}, ${input.agent ?? null}, ${input.model ?? null})
+      RETURNING id, state
+    `;
+
+    return {
+      message: `Subtask created (id: ${task!.id}). It will run in isolation. Use check_task_status to monitor.`,
+      task_id: task!.id,
+      state: task!.state,
+    };
+  },
+};