List stored blobs
AI agents call list_blobs to retrieve information from Walrus MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries the list of stored blobs without creating, modifying, or deleting any data. It has no side effects beyond information retrieval. Listing operations are inherently Read category with low severity since they do not change state or enable destructive actions.
From the tool's definition Tool name 'list_blobs' and description 'List stored blobs' indicate a read-only operation that retrieves or queries data without modification.
Attacks that exploit this kind of access
List stored blobs. It is categorised as a Read tool in the Walrus MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Walrus MCP Server MCP server in PolicyLayer and add a rule for list_blobs: 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 Walrus MCP Server. Nothing to install.
list_blobs 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 list_blobs 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 list_blobs. 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.
list_blobs is provided by the Walrus MCP Server MCP server (motion-labs-sui/walrus-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
Teams ship this data inside their own products. See what a licence covers →