Searches Reddit for content (e.g., posts, comments) using a query, with results typically confined to subreddits unless restrict_sr is set to False.
AI agents call REDDIT_SEARCH_ACROSS_SUBREDDITS to retrieve information from Reddit without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
sort | string | — | The criterion for sorting search results. 'relevance' (default) sorts by relevance to the query. 'new' sorts by newest first. 'top' sorts by highest score (typi |
limit | integer | — | The maximum number of search results to return. Default is 5. Maximum allowed value is 100. |
restrict_sr | boolean | — | If True (default), confines the search to posts and comments within subreddits. If False, the search scope is broader and may include matching subreddit names o |
search_query | string | — | The search query string used to find content across subreddits. |
Parameters from the server's own tool schema.
This tool performs a read-only search operation against Reddit content. It retrieves matching posts and comments based on a query string but does not create, modify, or delete any data. The blast radius of misuse is low as it only reads publicly available Reddit content.
From the tool's definition Searches Reddit for content (e.g., posts, comments) using a query
Documented attack patterns abuse exactly the kind of access REDDIT_SEARCH_ACROSS_SUBREDDITS 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_SEARCH_ACROSS_SUBREDDITS:
{
"version": "1",
"default": "deny",
"tools": {
"REDDIT_SEARCH_ACROSS_SUBREDDITS": {}
}
}REDDIT_SEARCH_ACROSS_SUBREDDITS is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Searches Reddit for content (e.g., posts, comments) using a query, with results typically confined to subreddits unless restrict_sr is set to False. It is categorised as a Read tool in the Reddit MCP Server, which means it retrieves data without modifying state.
REDDIT_SEARCH_ACROSS_SUBREDDITS accepts 4 parameters: sort, limit, restrict_sr, search_query. 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_SEARCH_ACROSS_SUBREDDITS: 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_SEARCH_ACROSS_SUBREDDITS 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 REDDIT_SEARCH_ACROSS_SUBREDDITS 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_SEARCH_ACROSS_SUBREDDITS. 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_SEARCH_ACROSS_SUBREDDITS 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.
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26 Reddit tools catalogued and risk-classified — across an index of 42,500+ MCP servers.