Tasks: UI auto-resume on send #1269

Repo: coder/coder

Scope: When user sends a message to a paused task, automatically resume and deliver.

Changes:

• Attempt to send message via POST /tasks/{task}/send
• If 409 response (task paused):
  • Store message in component state (not persisted)
  • Call POST /tasks/{task}/resume endpoint
  • Poll task status until active or build fails (see Polling logic below)
  • Show build progress indicator with workspace build details
  • Retry send with stored message when task is active
  • Clear stored message on successful send
  • Transition to live chat interface

Polling logic:

• Poll task status every 5 seconds
• Exit when task.Status === "active" (workspace running, agent ready, AgentAPI responding)
• Exit on terminal build failure (build job status is failed/canceled)

Local state handling:

• Message stored in component state during resume (not persisted)
• Message persists in input field during resume (user sees what they typed)
• Message cleared from state on successful send
• Message kept in input field on error (user can edit and retry)
• Message lost if user navigates away (acceptable - no warning needed, standard web behavior)

Error handling:

• 409 on send, resume build fails: Show build error modal, keep message in input field for retry
• 409 on send, resume succeeds, retry send fails: Show "Failed to send message" error, keep message in input field for retry
• Non-409 send error: Show send error (network/AgentAPI issue), keep message in input field

Files:

• site/src/pages/TaskPage/TaskPage.tsx

Acceptance criteria:

• Send to active task works normally (no change in behavior)
• Send to paused task receives 409, triggers resume, waits for active, retries send
• Message remains visible in input field during entire resume process
• Build progress indicator shown during resume with workspace build status
• Polling exits when task.Status === "active" and send succeeds
• Terminal build failure stops polling, shows build error, preserves message
• Retry send failure after successful resume shows send error, preserves message
• Successful send clears message from input and transitions to live chat
• User can navigate away during resume (message lost, no warning - standard behavior)

Dependencies:

• Tasks: Resume endpoint #1262
• Tasks: API /send returns 409 when paused #1265

References:

• PRD: Start/Pause/Resume the Task Workspace
• RFC: Tasks: Start/Pause/Resume Lifecycle: UI
• Figma: Tasks: Resume/stop/start