Bash tool called with invalid arguments: "expected string, received undefined" for command and description fields

[demiryasin95]

Description

OpenCode version:
(npm opencode-ai)
OS: Windows
Model: claude-opus-4-6 (via custom provider)
Error:
The bash tool is called with invalid arguments:

• command: expected string, received undefined
• description: expected string, received undefined
  Steps to reproduce:

1. Start opencode CLI
2. Ask it to perform any task that requires running a shell command
3. Tool call fails with schema validation error
   Expected behavior:
   Bash tool should receive valid string arguments for command and description fields.

Plugins

No response

OpenCode version

1.2.10

Steps to reproduce

No response

Screenshot and/or share link

No response

Operating System

Windows 11

Terminal

Windows Terminal

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• The bash tool was called with invalid arguments: #10213: Same error — bash tool called with invalid arguments: expected string, received undefined for command and description fields
• Bash(ls -la) tool description parameter is required but not exposed in tool schema — breaks all bash calls #13146: Same root cause — bash tool description parameter is required but not exposed in tool schema, causing all bash calls to fail with the same Zod validation error