Upload a local file to Hyperplexity. Compound tool: reads the file, gets a presigned S3 URL, PUTs the bytes (without auth headers — presigned URL carries the credentials), and returns session_id + s3_key ready for start_table_validation. file_type must be one of: "excel", "csv", "pdf"
Risk signalsAccepts file system path (file_path)
Part of the Hyperplexity server.
Free to start. No card required.
AI agents use upload_file to create or modify resources in Hyperplexity. 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 upload_file 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 Hyperplexity.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"upload_file": {
"limits": [
{
"counter": "upload_file_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Hyperplexity policy for all 16 tools.
These attack patterns abuse exactly the kind of access upload_file 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.
Upload a local file to Hyperplexity. Compound tool: reads the file, gets a presigned S3 URL, PUTs the bytes (without auth headers — presigned URL carries the credentials), and returns session_id + s3_key ready for start_table_validation. file_type must be one of: "excel", "csv", "pdf". It is categorised as a Write tool in the Hyperplexity MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Hyperplexity MCP server in PolicyLayer and add a rule for upload_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 Hyperplexity. Nothing to install.
upload_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 upload_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 upload_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.
upload_file is provided by the Hyperplexity MCP server (hyperplexity/hyperplexity). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 16 Hyperplexity tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.