Execute an INSERT, UPDATE, or DELETE query on the SQLite database
AI agents use write_query to create or update resources in MCP SQLite Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your MCP SQLite Server environment.
INSERT and UPDATE operations create or modify data reversibly, placing this tool in the Write category. While DELETE is mentioned, the tool's primary purpose emphasizes INSERT/UPDATE based on the description structure, and the presence of DELETE does not elevate it to Destructive in this context since the tool appears designed for general write operations.
From the tool's definition Tool description explicitly states it "Execute[s] an INSERT, UPDATE, or DELETE query on the SQLite database". The name "write_query" combined with the operations listed (INSERT, UPDATE, DELETE) confirms this is a data modification tool.
Documented attack patterns abuse exactly the kind of access write_query gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP SQLite Server, and nothing reaches the server without passing your rules. This is the rule we recommend for write_query:
{
"version": "1",
"default": "deny",
"tools": {
"write_query": {
"limits": [
{
"counter": "write_query_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}write_query stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Execute an INSERT, UPDATE, or DELETE query on the SQLite database. It is categorised as a Write tool in the MCP SQLite Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the MCP SQLite Server MCP server in PolicyLayer and add a rule for write_query: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches MCP SQLite Server. Nothing to install.
write_query is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the write_query rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for write_query. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
write_query is provided by the MCP SQLite Server MCP server (johnnyoshika/mcp-server-sqlite-npx). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from MCP SQLite Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
5 MCP SQLite Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.