AI agents use dbfs_put to create or update resources in Databricks MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Databricks MCP Server environment.
The tool creates or modifies data in DBFS (Databricks File System) through upload operations. While reversible via deletion, this is a Write operation—not Read (no query), not Execute (no code execution), not Destructive (upload is reversible with dbfs_delete), not Financial.
From the tool's definition Tool name 'dbfs_put' and description 'Upload small content to DBFS' indicate creation/modification of data in Databricks File System. DBFS is a persistent storage layer where data persists across sessions.
Documented attack patterns abuse exactly the kind of access dbfs_put gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Databricks MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for dbfs_put:
{
"version": "1",
"default": "deny",
"tools": {
"dbfs_put": {
"limits": [
{
"counter": "dbfs_put_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}dbfs_put 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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Upload small content to DBFS. It is categorised as a Write tool in the Databricks MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Databricks MCP Server MCP server in PolicyLayer and add a rule for dbfs_put: 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 Databricks MCP Server. Nothing to install.
dbfs_put 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 dbfs_put 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 dbfs_put. 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.
dbfs_put is provided by the Databricks MCP Server MCP server (markov-kernel/databricks-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Databricks MCP 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.
38 Databricks MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.