Upload a file to a file input on the current page. Use this to attach images, documents, or other files to forms, posts, or upload dialogs. The file must exist on the local filesystem.
Risk signalsAccepts file system path (filePath)
Part of the Perplexity Comet server.
Free to start. No card required.
AI agents use comet_upload to create or modify resources in Perplexity Comet. 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 comet_upload 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 Perplexity Comet.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"comet_upload": {
"limits": [
{
"counter": "comet_upload_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Perplexity Comet policy for all 8 tools.
These attack patterns abuse exactly the kind of access comet_upload 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 file to a file input on the current page. Use this to attach images, documents, or other files to forms, posts, or upload dialogs. The file must exist on the local filesystem.. It is categorised as a Write tool in the Perplexity Comet MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Perplexity Comet MCP server in PolicyLayer and add a rule for comet_upload: 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 Perplexity Comet. Nothing to install.
comet_upload 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 comet_upload 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 comet_upload. 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.
comet_upload is provided by the Perplexity Comet MCP server (perplexity-comet-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 8 Perplexity Comet 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.