Upload a notebook file to SingleStore Spaces
AI agents use upload_notebook_file to create or update resources in SingleStore MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your SingleStore MCP Server environment.
This tool performs a reversible write operation—uploading a file creates or modifies data in the Spaces system but does not irreversibly delete data or execute arbitrary code. The blast radius is medium because an adversarial agent could upload malicious notebook content that might later be executed by users, but the upload itself is non-destructive and the harm depends on subsequent actions.
From the tool's definition The tool description states 'Upload a notebook file to SingleStore Spaces', which creates or adds new data (a notebook file) to the system. The act of uploading is a write operation that modifies the state of SingleStore Spaces by adding a new file artifact.
Documented attack patterns abuse exactly the kind of access upload_notebook_file gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and SingleStore MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for upload_notebook_file:
{
"version": "1",
"default": "deny",
"tools": {
"upload_notebook_file": {
"limits": [
{
"counter": "upload_notebook_file_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}upload_notebook_file 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.
Free to start. No card required.
Upload a notebook file to SingleStore Spaces. It is categorised as a Write tool in the SingleStore MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the SingleStore MCP Server MCP server in PolicyLayer and add a rule for upload_notebook_file: 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 SingleStore MCP Server. Nothing to install.
upload_notebook_file 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 upload_notebook_file 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 upload_notebook_file. 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.
upload_notebook_file is provided by the SingleStore MCP Server MCP server (singlestore-labs/mcp-server-singlestore). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 24 SingleStore MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
24 SingleStore MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.