fix(todo): address todo_write review feedback

examples/coding-agent/tests/harness.ts

@@ -19,14 +19,15 @@ import SessionPersistenceJsonl from '@deepseek-ai/dsh-session-persistence-jsonl'
  * file's tests.
  */
 
-export const SYSTEM_PROMPT = 'You are a coding agent. Your only tool is bash; '
-  + 'do file operations with cat/grep/heredocs, check [exit code: N] markers, '
+export const SYSTEM_PROMPT = 'You are a coding agent. Use bash for file operations '
+  + 'with cat/grep/heredocs; check [exit code: N] markers, '
   + 'and report results briefly.'
 
 /** System prompt for the todo_write e2e: nudges the model to plan with the tool. */
 export const TODO_SYSTEM_PROMPT = 'You are a coding agent. For multi-step work, '
   + 'use the todo_write tool to track a task list: send the WHOLE list each call, '
-  + 'keep exactly one task in_progress, and mark a task completed as soon as it is done.'
+  + 'keep at most one task in_progress (exactly one while work remains), and mark '
+  + 'a task completed as soon as it is done.'
 
 export async function codingHarness(workdir: string, persistenceRoot?: string): Promise<Context> {
   const ctx = new Context()

examples/coding-agent/tests/todo-write.e2e.ts

@@ -1,7 +1,6 @@
 import { afterEach, describe, expect, it } from 'vitest'
 import type { Context } from 'cordis'
 import { AgentId } from '@deepseek-ai/dsh-agent'
-import type { TodoItem } from '@deepseek-ai/dsh-session'
 import { codingHarness, TODO_SYSTEM_PROMPT, waitForIdle } from './harness.ts'
 
 /**
@@ -42,14 +41,9 @@ describe.skipIf(!process.env.DEEPSEEK_API_KEY)('todo_write: real model records a
     expect(todoEvents.length).toBeGreaterThan(0)
 
     const todos = (todoEvents.at(-1)!).data.todos
-    expect(todos.length).toBeGreaterThanOrEqual(2)
-    // Every entry has a non-empty content and a valid status…
-    const valid: TodoItem['status'][] = ['pending', 'in_progress', 'completed']
-    for (const todo of todos) {
-      expect(todo.content.trim().length).toBeGreaterThan(0)
-      expect(valid).toContain(todo.status)
-    }
-    // …and the one-in-progress invariant the tool enforces held.
-    expect(todos.filter(t => t.status === 'in_progress').length).toBeLessThanOrEqual(1)
+    expect(todos).toEqual([
+      { content: 'inspect the failing test', status: 'in_progress' },
+      { content: 'apply the fix', status: 'pending' },
+    ])
   }, 120_000)
 })