AI agents call fetch_datasources to retrieve information from Storyblok MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The 'fetch' prefix strongly suggests a read-only operation that retrieves datasource configuration or metadata from Storyblok without modifying it. No language in the server description or tool name indicates content creation, deletion, or execution of external operations. The low severity reflects that unauthorized datasource reads would have minimal blast radius in a typical CMS context.
From the tool's definition Tool name 'fetch_datasources' uses 'fetch' verb which indicates data retrieval with no side effects. The tool is part of a CMS content management server where datasources are typically reference data structures (e.g., dropdown options, content sets) that are…
Documented attack patterns abuse exactly the kind of access fetch_datasources gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Storyblok MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for fetch_datasources:
{
"version": "1",
"default": "deny",
"tools": {
"fetch_datasources": {}
}
}fetch_datasources is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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fetch_datasources. It is categorised as a Read tool in the Storyblok MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Storyblok MCP Server MCP server in PolicyLayer and add a rule for fetch_datasources: 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 Storyblok MCP Server. Nothing to install.
fetch_datasources 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 fetch_datasources 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 fetch_datasources. 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.
fetch_datasources is provided by the Storyblok MCP Server MCP server (arjuncodess/storyblok-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Storyblok MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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115 Storyblok MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.