AI agents use add-note to create or update resources in Simple Snowflake MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Simple Snowflake MCP environment.
This tool creates or modifies note data in a reversible manner. It does not execute queries, delete data irreversibly, or move money. The sibling tools on this server (execute-query, delete-note, export-schema) perform more severe operations, but add-note itself is a straightforward Write operation with low blast radius if misused by an AI agent—at worst, notes would be created or overwritten.
From the tool's definition Tool name 'add-note' and description 'Add or update a note for future reference' indicate data creation/modification operations.
Documented attack patterns abuse exactly the kind of access add-note gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Simple Snowflake MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for add-note:
{
"version": "1",
"default": "deny",
"tools": {
"add-note": {
"limits": [
{
"counter": "add-note_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}add-note 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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Add or update a note for future reference. It is categorised as a Write tool in the Simple Snowflake MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Simple Snowflake MCP server in PolicyLayer and add a rule for add-note: 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 Simple Snowflake MCP. Nothing to install.
add-note 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 add-note 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 add-note. 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.
add-note is provided by the Simple Snowflake MCP server (yannbrrd/simple_snowflake_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Simple Snowflake MCP, 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.
8 Simple Snowflake MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.