Save a script source to a local file. Use VM<id> pattern to match by scriptId, otherwise matches by URL substring.
AI agents use save_script_source to create or update resources in ReverseCraft DevTools MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your ReverseCraft DevTools MCP environment.
This tool creates or modifies files on the local system by saving script source code. While this is reversible (files can be deleted or overwritten), it writes data to disk and could consume resources or overwrite existing files if misused. It does not execute code, delete irreversibly, or move money, so Write is the correct category.
From the tool's definition Tool description explicitly states 'Save a script source to a local file', which is a write operation that creates or modifies data on the local filesystem.
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 ReverseCraft DevTools 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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Save a script source to a local file. Use VM<id> pattern to match by scriptId, otherwise matches by URL substring. It is categorised as a Write tool in the ReverseCraft DevTools MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the ReverseCraft DevTools 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 ReverseCraft DevTools 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 ReverseCraft DevTools MCP server (reverse-craft/rc-devtools-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from ReverseCraft DevTools MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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46 ReverseCraft DevTools MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.