community-post
Post to a community (NIP-72). Creates a kind 1 note with an a-tag pointing to the community. A moderator must approve it before it appears in the feed.
This record as markdown: /tools/dev-forgesworn-bray/community-post.md
What community-post does on Nostr Bray
AI agents use community-post to create or update resources in Nostr Bray, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Nostr Bray environment.
Why community-post is rated Medium
This tool creates new data (a Nostr note) in a community context, which is a Write operation. It is not Read (no retrieval), not Execute (no code/command execution), not Destructive (content can be deleted or remains in moderation queue), and not Financial. Severity is medium because misuse could spam communities with unwanted posts, but the moderator approval gate and reversibility limit the blast radius.
From the tool's definition Tool description states it 'Creates a kind 1 note' and 'Posts to a community', indicating creation of new content. The note requires moderator approval before appearing, suggesting it is reversible (can be deleted/unapproved) rather than immediately permanent.
Attacks that exploit this kind of access
The rule that runs community-post 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 community-post, this is the rule to start with:
community-post 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Nostr Bray, apply this rule, and every community-post call is checked against it from then on.
Questions about community-post
Post to a community (NIP-72). Creates a kind 1 note with an a-tag pointing to the community. A moderator must approve it before it appears in the feed. It is categorised as a Write tool in the Nostr Bray MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Nostr Bray MCP server in PolicyLayer and add a rule for community-post: 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.
community-post 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 community-post 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 community-post. 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.
community-post 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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