sanitize tools for Gemini 3 compatibility #4512

Description

Got error when try to send message to gemini 3 model:

Invalid value at 'tools.function_declarations[12].parameters.properties[0].value.enum[0]' (TYPE_STRING), 0
Invalid value at 'tools.function_declarations[12].parameters.properties[0].value.enum[1]' (TYPE_STRING), 1
Invalid value at 'tools.function_declarations[12].parameters.properties[0].value.enum[2]' (TYPE_STRING), 2
Invalid value at 'tools.function_declarations[12].parameters.properties[1].value.enum[0]' (TYPE_STRING), 0
Invalid value at 'tools.function_declarations[12].parameters.properties[1].value.enum[1]' (TYPE_STRING), 1
Invalid value at 'tools.function_declarations[12].parameters.properties[1].value.enum[2]' (TYPE_STRING), 2
Invalid value at 'tools.function_declarations[12].parameters.properties[1].value.enum[3]' (TYPE_STRING), 3

After research i found out that problem was caused by Ponter MCP, would you handle properties type ?

OpenCode version

v1.0.78

Steps to reproduce

1. Add MCP:
   "pointer": {
   "type": "local",
   "command": ["npx", "-y", "@mcp-pointer/server@latest", "start"],
   "environment": {
   "MCP_POINTER_PORT": "7007"
   }

2. Try to send message

Screenshot and/or share link

No response

Operating System

Nobara 42

Terminal

No response