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Testing Plan Approval Tool Availability Issue

The Problem

When in planning mode and a plan is approved:

  1. The AI uses PlanApprovedTool which switches the session to normal mode
  2. However, the current response still has planning mode tools (read-only)
  3. If the AI tries to use write, edit, or bash tools, it gets an error
  4. These tools only become available in the next response

Root Cause

The tool context is set at the beginning of each AI response based on the session mode at that time. Even though PlanApprovedTool changes the session mode mid-response, the available tools don't update until the next response.

Solution

The PlanApprovedTool now explicitly warns the AI:

  • NOT to use implementation tools in the current response
  • To use TodoWrite to prepare implementation steps
  • To wait for the user to send another message before starting implementation

Testing Steps

  1. Start opencode
  2. Enter planning mode (Shift+Tab)
  3. Ask to implement something: "Create a new file called test.js with a hello world function"
  4. When the AI presents a plan, approve it: "yes, looks good"
  5. Observe that the AI:
    • Uses PlanApprovedTool
    • Does NOT try to use write/edit/bash tools
    • Uses TodoWrite to prepare steps
    • Asks the user to send a message to start implementation
  6. Send "go ahead" or "start"
  7. Now the AI has access to all tools and can implement

Expected Behavior

Before Fix

  • AI tries to use write tool after plan approval
  • Gets error: "Tool not found" or similar
  • User confused why implementation fails

After Fix

  • AI acknowledges plan approval
  • AI prepares todo list
  • AI explicitly asks user to send a message to start
  • No tool errors
  • Clear workflow for the user

Code Flow

Planning Mode Response:
- Available tools: read, grep, glob, ls, todo, planapproved
- User approves plan
- AI uses PlanApprovedTool (switches mode to normal)
- AI still has planning mode tools for rest of response
- AI must NOT use write/edit/bash

Next Response (Normal Mode):
- Available tools: ALL tools including write, edit, bash
- AI can now implement the plan

This is a limitation of the AI SDK's streamText function - tools are determined once per response and cannot be changed mid-stream.