blossom-list

List blobs uploaded by a pubkey on a blossom server.

SERVERNostr Bray SOURCEnostr-bray

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/dev-forgesworn-bray/blossom-list.md

WHAT IT DOES

What blossom-list does on Nostr Bray

AI agents call blossom-list to retrieve information from Nostr Bray without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why blossom-list is rated Low

The tool retrieves and enumerates existing blob data associated with a public key on a Blossom server. This is a read-only operation that queries data without creating, modifying, deleting, or executing external operations. The verb 'list' and the retrieval context confirm this is a Read category tool with low severity since unauthorized access to a user's blob list has limited blast radius.

From the tool's definition Tool name 'blossom-list' and description 'List blobs uploaded by a pubkey on a blossom server' indicate a query/retrieval operation with no modification or side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs blossom-list safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Nostr Bray, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For blossom-list, this is the rule to start with:

blossom-list Allowed

blossom-list is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "blossom-list": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Nostr Bray, apply this rule, and every blossom-list call is checked against it from then on.

FAQ

Questions about blossom-list

What does the blossom-list tool do? +

List blobs uploaded by a pubkey on a blossom server. It is categorised as a Read tool in the Nostr Bray MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on blossom-list? +

Register the Nostr Bray MCP server in PolicyLayer and add a rule for blossom-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 Nostr Bray. Nothing to install.

What risk level is blossom-list? +

blossom-list is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit blossom-list? +

Yes. Add a rate_limit block to the blossom-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.

How do I block blossom-list completely? +

Set action: deny in the PolicyLayer policy for blossom-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.

What MCP server provides blossom-list? +

blossom-list is provided by the Nostr Bray MCP server (nostr-bray). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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