AI agents call get_js_block to retrieve information from Nocobase without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves (reads) a JavaScript block's UI schema configuration by its unique identifier. It performs a query operation with no side effects—it neither modifies, executes, deletes, nor commits any changes. The action is non-destructive data retrieval, placing it squarely in the Read category with low severity.
From the tool's definition Tool name 'get_js_block' and description 'Get a JS block UI schema by UID' indicate retrieval of schema configuration data.
Attacks that exploit this kind of access
Get a JS block UI schema by UID (for classic. It is categorised as a Read tool in the Nocobase MCP Server, which means it retrieves data without modifying state.
Register the Nocobase MCP server in PolicyLayer and add a rule for get_js_block: 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 Nocobase. Nothing to install.
get_js_block 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 get_js_block 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 get_js_block. 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.
get_js_block is provided by the Nocobase MCP server (puguhsudarma/nocobase-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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