AI agents use upload_document to create or update resources in Sifter — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Sifter environment.
Upload operations create new data entries (documents and their derived records) within the system. This is reversible via the sibling 'delete_sift' tool and does not execute arbitrary code or cause financial transactions, placing it in Write category.
From the tool's definition Tool name 'upload_document' indicates file/document creation or modification. Server description states 'Sifter turns documents into typed, schema-defined records', establishing that uploaded documents become structured data within the system.
Documented attack patterns abuse exactly the kind of access upload_document gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Sifter, and nothing reaches the server without passing your rules. This is the rule we recommend for upload_document:
{
"version": "1",
"default": "deny",
"tools": {
"upload_document": {
"limits": [
{
"counter": "upload_document_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}upload_document 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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upload_document. It is categorised as a Write tool in the Sifter MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Sifter MCP server in PolicyLayer and add a rule for upload_document: 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 Sifter. Nothing to install.
upload_document 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_document 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_document. 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_document is provided by the Sifter MCP server (sifter-ai/sifter). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 15 Sifter tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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15 Sifter tools catalogued and risk-classified — across an index of 42,500+ MCP servers.