AI agents use update_field_plugin to create or update resources in Storyblok MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Storyblok MCP Server environment.
The tool modifies plugin field configuration in Storyblok (Write category). Severity is medium because such updates could affect content rendering or workflows but are typically reversible. Confidence is 0.75 due to empty description, though the naming pattern and server context support Write classification over Execute.
From the tool's definition Tool name 'update_field_plugin' indicates modification of field plugin configuration. Sibling tools like 'bulk_update_stories' and 'bulk_publish_stories' confirm this server performs Write operations.
Documented attack patterns abuse exactly the kind of access update_field_plugin 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 update_field_plugin:
{
"version": "1",
"default": "deny",
"tools": {
"update_field_plugin": {
"limits": [
{
"counter": "update_field_plugin_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update_field_plugin 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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update_field_plugin. It is categorised as a Write tool in the Storyblok MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Storyblok MCP Server MCP server in PolicyLayer and add a rule for update_field_plugin: 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.
update_field_plugin 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 update_field_plugin 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 update_field_plugin. 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.
update_field_plugin is provided by the Storyblok MCP Server MCP server (kiran1689/storyblok-mcp-server). 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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159 Storyblok MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.