Prevent $500 Accidental AI Queries with Mandatory Dry-Run Byte Caps
Runs a mandatory dry-run byte estimate before executing any warehouse query, blocks full-table scans above your threshold, and caches results in DuckDB.
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{
"mcpServers": {
"query-guard": {
"command": "uvx",
"args": [
"queryguard-mcp-server"
],
"env": {
"MAX_BYTES_BILLED": "5368709120",
"REQUIRE_PARTITION_FILTER": "true",
"LOCAL_DUCKDB_CACHE": "./.cache/analytics.duckdb"
}
}
}
}
What’s Included in QueryGuard BigQuery/DuckDB MCP
- Hard byte-billed circuit breaker (default: 5 GB max per agent query)
- Automatic partition-filter enforcement on timestamp columns
- Zero-cost local Parquet & CSV querying via embedded DuckDB engine