List all Data Sources in the Tinybird Workspace
AI agents call list-data-sources to retrieve information from Tinybird MCP server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns metadata about data sources within a Tinybird workspace. It performs no writes, deletions, or code execution. The blast radius of misuse is minimal—an agent would only gain visibility into available data sources. Classification as Read is appropriate.
From the tool's definition Tool name is 'list-data-sources' and description states it 'List[s] all Data Sources in the Tinybird Workspace' — this is a retrieval operation with no modification, deletion, or execution of external operations.
Risk signalsBulk/mass operation — affects multiple targets
Documented attack patterns abuse exactly the kind of access list-data-sources gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Tinybird MCP server, and nothing reaches the server without passing your rules. This is the rule we recommend for list-data-sources:
{
"version": "1",
"default": "deny",
"tools": {
"list-data-sources": {}
}
}list-data-sources is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all Data Sources in the Tinybird Workspace. It is categorised as a Read tool in the Tinybird MCP server MCP Server, which means it retrieves data without modifying state.
Register the Tinybird MCP server MCP server in PolicyLayer and add a rule for list-data-sources: 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 Tinybird MCP server. Nothing to install.
list-data-sources is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list-data-sources 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 list-data-sources. 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.
list-data-sources is provided by the Tinybird MCP server MCP server (tinybirdco/mcp-tinybird). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 11 Tinybird MCP server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
11 Tinybird MCP server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.