Guidance error when tool_choice=required #335
Description
Foundry Local version 0.8.113 is giving the following error when tool_choice=required, for some payloads.
This is the error:
"Error creating grammar: failed to parse \"%json\": control character (\\u0000-\\u001F) found while parsing a string at line 12 column 0"
Example payload
{
"messages": [
{
"role": "system",
"content": "You are a helpful email and calendar assistant.\n\nCurrent date: 2025-11-29\n\nYou have access to the following tools:\n- search_emails: Search for emails containing specific keywords\n- get_latest_emails: Get the most recent emails\n- search_calendar: Search calendar events by query or date\n- get_upcoming_events: Get upcoming calendar events\n\nWhen the user asks a question:\n1. Use the appropriate tools to gather information\n2. Synthesize a clear, specific answer based on the tool results\n3. Include relevant details like dates, times, subjects, and people\n\nBe concise but informative."
},
{
"role": "user",
"content": "Search for any emails from Bob"
}
],
"model": "qwen2.5-1.5b-instruct-generic-gpu:4",
"max_tokens": 1024,
"stream": false,
"tool_choice": "required",
"tools": [
{
"type": "function",
"function": {
"name": "search_emails",
"description": "Search emails for a specific query string.\n\nArgs:\n query: Search query to find in emails\n max_results: Maximum number of results to return (default: 5)\n\nReturns:\n Formatted string with matching emails",
"parameters": {
"type": "object",
"properties": {
"query": {
"type": "string",
"description": "Search query to find in emails or events"
},
"max_results": {
"type": "integer",
"description": "Maximum number of results to return"
}
},
"required": [
"query",
"max_results"
]
}
}
},
{
"type": "function",
"function": {
"name": "get_latest_emails",
"description": "Get the most recent emails.\n\nArgs:\n count: Number of recent emails to retrieve (default: 5)\n\nReturns:\n Formatted string with recent emails",
"parameters": {
"type": "object",
"properties": {
"count": {
"type": "integer",
"description": "Number of recent emails to retrieve"
}
},
"required": [
"count"
]
}
}
},
{
"type": "function",
"function": {
"name": "search_calendar",
"description": "Search calendar events by query or date.\n\nArgs:\n query: Required search query for event subject\n date: Required date in YYYY-MM-DD format to filter events\n\nReturns:\n Formatted string with matching calendar events",
"parameters": {
"type": "object",
"properties": {
"query": {
"type": "string",
"description": "Search query for event subject"
},
"date": {
"type": "string",
"description": "Date in YYYY-MM-DD format to filter events"
}
},
"required": [
"query",
"date"
]
}
}
},
{
"type": "function",
"function": {
"name": "get_upcoming_events",
"description": "Get upcoming calendar events for the next N days.\n\nArgs:\n days: Number of days to look ahead (default: 7)\n\nReturns:\n Formatted string with upcoming events",
"parameters": {
"type": "object",
"properties": {
"days": {
"type": "integer",
"description": "Number of days to look ahead"
}
},
"required": [
"days"
]
}
}
}
]
}