Creates a new text or link post on a specified, existing Reddit subreddit, optionally applying a flair.
AI agents use REDDIT_CREATE_REDDIT_POST to create or update resources in Reddit — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Reddit environment.
| Parameter | Type | Required | Description |
|---|---|---|---|
url | string | — | The URL for a 'link' post. Required if `kind` is 'link'. |
kind | string | — | The type of the post. Use 'self' for a text-based post or 'link' for a post that links to an external URL. |
text | string | — | The markdown-formatted text content for a 'self' post. Required if `kind` is 'self'. |
title | string | — | The title of the post. Must be 300 characters or less. |
flair_id | string | — | Optional ID of the flair to apply to the post. Use the 'REDDIT_GET_USER_FLAIR' action to find available flair IDs for the specified subreddit. Omit this field e |
subreddit | string | — | The name of the subreddit (without the 'r/' prefix) where the post will be submitted. |
Parameters from the server's own tool schema.
This tool creates new content on Reddit, which is a Write operation (reversible modification). While the server supports destructive actions (delete_post, delete_comment), this specific tool only creates content. The severity is medium because misuse could spam, impersonate, or spread misinformation, but the effects are recoverable. Confidence is high due to unambiguous evidence from both tool name and description.
From the tool's definition Tool name and description explicitly state 'Creates a new text or link post' — a content creation action that is reversible (posts can be deleted). Server description confirms 'create posts' capability.
Risk signalsAccepts URL/endpoint input (url)
Documented attack patterns abuse exactly the kind of access REDDIT_CREATE_REDDIT_POST gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Reddit, and nothing reaches the server without passing your rules. This is the rule we recommend for REDDIT_CREATE_REDDIT_POST:
{
"version": "1",
"default": "deny",
"tools": {
"REDDIT_CREATE_REDDIT_POST": {
"limits": [
{
"counter": "reddit_create_reddit_post_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}REDDIT_CREATE_REDDIT_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.
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Creates a new text or link post on a specified, existing Reddit subreddit, optionally applying a flair. It is categorised as a Write tool in the Reddit MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
REDDIT_CREATE_REDDIT_POST accepts 6 parameters: url, kind, text, title, flair_id, subreddit. The full parameter table on this page comes from the server's own tool schema.
Register the Reddit MCP server in PolicyLayer and add a rule for REDDIT_CREATE_REDDIT_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 Reddit. Nothing to install.
REDDIT_CREATE_REDDIT_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 REDDIT_CREATE_REDDIT_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 REDDIT_CREATE_REDDIT_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.
REDDIT_CREATE_REDDIT_POST is provided by the Reddit MCP server (reddit-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 26 Reddit tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
26 Reddit tools catalogued and risk-classified — across an index of 42,500+ MCP servers.