Fetches a file from a remote web URL and uploads it as a new revision of an existing file, preserving prior revisions in the file history, and returns the file title and URL. The upload appears in the wiki
AI agents use update-file-from-url to create or update resources in Mediawiki Mcp Server Olioex — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mediawiki Mcp Server Olioex environment.
This tool creates/modifies data reversibly—it uploads a new revision of an existing file while preserving prior revisions in history, so the action is not destructive. The high severity reflects potential misuse: an attacker could replace legitimate files with malicious content (e.g., injecting malware, phishing images, misleading documents), affecting all wiki users who access or embed that file.
From the tool's definition The tool description states it 'uploads it as a new revision of an existing file' and 'returns the file title and URL.' The phrase 'appears in the wiki' confirms persistent modification.
Documented attack patterns abuse exactly the kind of access update-file-from-url gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mediawiki Mcp Server Olioex, and nothing reaches the server without passing your rules. This is the rule we recommend for update-file-from-url:
{
"version": "1",
"default": "deny",
"tools": {
"update-file-from-url": {
"limits": [
{
"counter": "update-file-from-url_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update-file-from-url 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.
Free to start. No card required.
Fetches a file from a remote web URL and uploads it as a new revision of an existing file, preserving prior revisions in the file history, and returns the file title and URL. The upload appears in the wiki. It is categorised as a Write tool in the Mediawiki Mcp Server Olioex MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Mediawiki Mcp Server Olioex MCP server in PolicyLayer and add a rule for update-file-from-url: 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 Mediawiki Mcp Server Olioex. Nothing to install.
update-file-from-url 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-file-from-url 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-file-from-url. 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-file-from-url is provided by the Mediawiki Mcp Server Olioex MCP server (mediawiki-mcp-server-olioex). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mediawiki Mcp Server Olioex, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
38 Mediawiki Mcp Server Olioex tools catalogued and risk-classified — across an index of 43,000+ MCP servers.