Write content to a file inside a Studio site directory. Safe: only allows paths within the given sitePath.
AI agents use wpdev_fs_write_file to create or update resources in WordPress Developer MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your WordPress Developer MCP Server environment.
This tool creates or modifies files reversibly within a WordPress site directory. While scoped to a sitePath boundary, it permits arbitrary content writes to files, which could modify configuration files, theme files, plugin code, or other site assets. The impact is high because malicious file writes could compromise site integrity, inject malicious code, or alter business logic.
From the tool's definition Tool name 'wpdev_fs_write_file' and description 'Write content to a file' explicitly indicate file modification capability. The description notes it 'only allows paths within the given sitePath', suggesting scope limitation but not elimination of write risk.
Documented attack patterns abuse exactly the kind of access wpdev_fs_write_file gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and WordPress Developer MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for wpdev_fs_write_file:
{
"version": "1",
"default": "deny",
"tools": {
"wpdev_fs_write_file": {
"limits": [
{
"counter": "wpdev_fs_write_file_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}wpdev_fs_write_file 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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Write content to a file inside a Studio site directory. Safe: only allows paths within the given sitePath. It is categorised as a Write tool in the WordPress Developer MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the WordPress Developer MCP Server MCP server in PolicyLayer and add a rule for wpdev_fs_write_file: 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 WordPress Developer MCP Server. Nothing to install.
wpdev_fs_write_file 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 wpdev_fs_write_file 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 wpdev_fs_write_file. 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.
wpdev_fs_write_file is provided by the WordPress Developer MCP Server MCP server (nightnei/wordpress-developer-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 25 WordPress Developer MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
25 WordPress Developer MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.