lemmy_post

Create a post in a community. Either url (link post) or body (text post) must be set — or both. Rate-limited: 10/hour.

SERVERCrow SOURCEkh0pper/crow

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/kh0pper-crow/lemmy-post.md

WHAT IT DOES

What lemmy_post does on Crow

AI agents use lemmy_post to create or update resources in Crow, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Crow environment.

RISK

Why lemmy_post is rated Medium

This tool creates data (a post in a Lemmy community) which is reversible (posts can be deleted). It does not execute arbitrary code, delete data irreversibly, or move money. The rate limit suggests it performs real actions with persistent effects. Medium severity reflects that misuse could spam communities or create unwanted content, but the effect is limited to a single community and posts are editable/deletable.

From the tool's definition Tool description states it will "Create a post" and notes it is "Rate-limited: 10/hour", indicating a reversible creation action with side effects on external platforms.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs lemmy_post safely

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

lemmy_post Rate-limited

lemmy_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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "lemmy_post": {
      "limits": [
        {
          "counter": "lemmy_post_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Crow, apply this rule, and every lemmy_post call is checked against it from then on.

FAQ

Questions about lemmy_post

What does the lemmy_post tool do? +

Create a post in a community. Either url (link post) or body (text post) must be set — or both. Rate-limited: 10/hour. It is categorised as a Write tool in the Crow MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on lemmy_post? +

Register the Crow MCP server in PolicyLayer and add a rule for lemmy_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 Crow. Nothing to install.

What risk level is lemmy_post? +

lemmy_post is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit lemmy_post? +

Yes. Add a rate_limit block to the lemmy_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.

How do I block lemmy_post completely? +

Set action: deny in the PolicyLayer policy for lemmy_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.

What MCP server provides lemmy_post? +

lemmy_post is provided by the Crow MCP server (kh0pper/crow). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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