Saves the full source code of a JavaScript script to a local file.
AI agents use save_script_source to create or update resources in MiniApp CDP MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your MiniApp CDP MCP environment.
This tool creates or writes data to the local filesystem (a JavaScript source file). While the file can be deleted or overwritten later, the act of saving is a Write operation—reversible and non-destructive. It does not execute code, move money, or permanently delete data.
From the tool's definition Tool name is 'save_script_source' and description states it 'Saves the full source code of a JavaScript script to a local file.' The action of writing/saving data to a local file is a reversible modification operation.
Documented attack patterns abuse exactly the kind of access save_script_source gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MiniApp CDP MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for save_script_source:
{
"version": "1",
"default": "deny",
"tools": {
"save_script_source": {
"limits": [
{
"counter": "save_script_source_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}save_script_source 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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Saves the full source code of a JavaScript script to a local file. It is categorised as a Write tool in the MiniApp CDP MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the MiniApp CDP MCP server in PolicyLayer and add a rule for save_script_source: 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 MiniApp CDP MCP. Nothing to install.
save_script_source 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 save_script_source 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 save_script_source. 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.
save_script_source is provided by the MiniApp CDP MCP server (zhizhuodemao/miniapp-cdp-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 18 MiniApp CDP MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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18 MiniApp CDP MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.