AI agents call blob_list to retrieve information from Flux MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool performs a query operation to retrieve/list blob metadata filtered by task ID. It has no side effects, creates no data, executes no commands, and causes no irreversible changes. This is a straightforward Read operation with minimal risk if misused by an AI agent.
From the tool's definition Tool name 'blob_list' and description 'List blobs, optionally filtered by task ID' indicate a retrieval operation with no modification or deletion of data.
Documented attack patterns abuse exactly the kind of access blob_list gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Flux MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for blob_list:
{
"version": "1",
"default": "deny",
"tools": {
"blob_list": {}
}
}blob_list is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List blobs, optionally filtered by task ID. It is categorised as a Read tool in the Flux MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Flux MCP Server MCP server in PolicyLayer and add a rule for blob_list: 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 Flux MCP Server. Nothing to install.
blob_list is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the blob_list 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 blob_list. 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.
blob_list is provided by the Flux MCP Server MCP server (sirsjg/flux). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 25 Flux MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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25 Flux MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.