Download a remote file and convert it with TweekIT in one step. This helper first fetches url, infers the input extension when possible, and then forwards the bytes to convert. Supply fetchHeaders when the remote resource needs authentication or custom headers. Args: url: Direct download URL for ...
Risk signalsAccepts URL/endpoint input (url) · Handles credentials or secrets (apiKey) · High parameter count (16 properties)
Part of the TweekIT MCP Server server.
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AI agents use convert_url to create or modify resources in TweekIT MCP Server. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call convert_url repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach TweekIT MCP Server.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"convert_url": {
"limits": [
{
"counter": "convert_url_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full TweekIT MCP Server policy for all 5 tools.
These attack patterns abuse exactly the kind of access convert_url gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Download a remote file and convert it with TweekIT in one step. This helper first fetches url, infers the input extension when possible, and then forwards the bytes to convert. Supply fetchHeaders when the remote resource needs authentication or custom headers. Args: url: Direct download URL for the source document or image. outfmt: Desired output format (Fmt). apiKey: TweekIT API key (ApiKey header). Falls back to TWEEKIT_API_KEY env var. apiSecret: TweekIT API secret (ApiSecret header). Falls back to TWEEKIT_API_SECRET env var. inext: Optional override for the source extension if it cannot be detected from the URL or response headers. noRasterize: Forwarded to TweekIT to skip rasterization when possible. width: Optional pixel width to request in the output. height: Optional pixel height to request in the output. x1: Left crop coordinate in source pixels. y1: Top crop coordinate in source pixels. x2: Right crop coordinate in source pixels. y2: Bottom crop coordinate in source pixels. page: Page number to extract for multipage inputs. alpha: Whether the output should preserve alpha transparency. bgColor: Background color to composite behind transparent pixels. fetchHeaders: Optional mapping of HTTP headers to include when fetching. Returns: A FastMCP Image or File payload, or an error description.. It is categorised as a Write tool in the TweekIT MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the TweekIT MCP Server MCP server in PolicyLayer and add a rule for convert_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 TweekIT MCP Server. Nothing to install.
convert_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 convert_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 convert_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.
convert_url is provided by the TweekIT MCP Server MCP server (https://mcp.tweekit.io/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 5 TweekIT MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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