hashtag-feed
Fetch notes (kind 1) with a specific hashtag. Uses standard tag filtering — works on all relays, no NIP-50 required.
This record as markdown: /tools/dev-forgesworn-bray/hashtag-feed.md
What hashtag-feed does on Nostr Bray
AI agents call hashtag-feed 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.
Why hashtag-feed is rated Low
This tool queries and retrieves Nostr notes matching a hashtag filter. It has no side effects, does not modify data, does not execute external operations, and does not involve financial transactions. It is a straightforward read operation analogous to searching or listing data. The low severity reflects minimal blast radius: an agent fetching hashtag-filtered notes poses no destructive or irreversible risk.
From the tool's definition Tool description states 'Fetch notes' — a retrieval operation with no modification or execution. The mechanism is 'standard tag filtering' on existing data.
Attacks that exploit this kind of access
The rule that runs hashtag-feed 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 hashtag-feed, this is the rule to start with:
hashtag-feed is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Nostr Bray, apply this rule, and every hashtag-feed call is checked against it from then on.
Questions about hashtag-feed
Fetch notes (kind 1) with a specific hashtag. Uses standard tag filtering — works on all relays, no NIP-50 required. It is categorised as a Read tool in the Nostr Bray MCP Server, which means it retrieves data without modifying state.
Register the Nostr Bray MCP server in PolicyLayer and add a rule for hashtag-feed: 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.
hashtag-feed 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 hashtag-feed 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 hashtag-feed. 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.
hashtag-feed 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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