Upload a file to the Storacha Network. The file must be provided as a base64 encoded string. The file name should include the extension (e.g.,
AI agents use upload to create or update resources in Storacha MCP Storage Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Storacha MCP Storage Server environment.
This tool creates new files in a decentralized storage network, which is a reversible write operation. It does not execute code, delete data, or move money. Severity is medium because unauthorized file uploads could introduce malicious content, consume storage quota, or contaminate the storage namespace, but the action is reversible (files can be deleted by authorized parties).
From the tool's definition Tool description states 'Upload a file to the Storacha Network' — an explicit write operation that creates new data in a decentralized storage system. The tool accepts base64-encoded file content and a filename, enabling modification of stored data.
Documented attack patterns abuse exactly the kind of access upload gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Storacha MCP Storage Server, and nothing reaches the server without passing your rules. This is the rule we recommend for upload:
{
"version": "1",
"default": "deny",
"tools": {
"upload": {
"limits": [
{
"counter": "upload_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}upload 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.
Upload a file to the Storacha Network. The file must be provided as a base64 encoded string. The file name should include the extension (e.g.,. It is categorised as a Write tool in the Storacha MCP Storage Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Storacha MCP Storage Server MCP server in PolicyLayer and add a rule for 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 Storacha MCP Storage Server. Nothing to install.
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 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 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.
upload is provided by the Storacha MCP Storage Server MCP server (storacha/mcp-storage-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Storacha MCP Storage Server, 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.
3 Storacha MCP Storage Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.