lemmy_comment
Reply to a post or another comment. Pass post_id (required) and optional parent_id for replies to comments. Rate-limited: 20/hour.
This record as markdown: /tools/kh0pper-crow/lemmy-comment.md
What lemmy_comment does on Crow
AI agents use lemmy_comment 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.
Why lemmy_comment is rated Medium
This tool creates new data (a comment) in a reversible manner—comments can be edited or deleted. It does not execute arbitrary code, delete data irreversibly, or move money. The rate limiting (20/hour) suggests some safeguards are in place. Severity is medium because misuse could spam, harass, or pollute the Lemmy community, but the impact is limited to comment creation and can be mitigated by moderation or deletion.
From the tool's definition Tool description states 'Reply to a post or another comment' which creates new content (a comment) on what appears to be a Lemmy instance (federated social media platform).
Attacks that exploit this kind of access
The rule that runs lemmy_comment 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_comment, this is the rule to start with:
lemmy_comment 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 Crow, apply this rule, and every lemmy_comment call is checked against it from then on.
Questions about lemmy_comment
Reply to a post or another comment. Pass post_id (required) and optional parent_id for replies to comments. Rate-limited: 20/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.
Register the Crow MCP server in PolicyLayer and add a rule for lemmy_comment: 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.
lemmy_comment 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 lemmy_comment 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 lemmy_comment. 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.
lemmy_comment 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.
More on Crow, and thousands of servers like it.
This server
Across the catalogue