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reddit-ads-mcp

reddit-ads-mcp

by filippofinke
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Local

Suggest communities

reddit_ads_suggest_communities
Read-only

Suggest related subreddits from seed names or a website URL, so you can find and target Reddit Ads communities that match your audience.

Instructions

Suggest related subreddits from seed subreddits and/or a website URL.

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "reddit_ads_suggest_communities"
  }
}

Input Schema

NameRequiredDescriptionDefault
namesNoComma separated seed subreddit names
max_pagesNoFollow pagination.next_url up to this many pages and merge results (default 1)
page_sizeNoItems per page (usually max 1000)
page_tokenNoPage token from a previous pagination.next_url
website_urlNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

C2.9/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds nothing behavioral beyond that: no indication of auth requirements, rate limits, result shape, or how many suggestions come back, and it largely restates the title plus the input fields.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

One tight sentence with the resource and the trigger input front-loaded and no filler. It is efficient, though its brevity borders on under-specification given the tool has five optional parameters and no output schema.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a read-only discovery tool with no output schema, the description is not required to explain returns. However, it omits a key clarification: with zero required parameters, an agent cannot tell whether names, website_url, or both must be supplied, and no sibling routing is provided. Adequate but with clear gaps.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 80% and the schema documents names, max_pages, page_size, and page_token well; only website_url lacks a schema description. The description confirms website_url and the seed-based input, but adds no syntax, format, or interaction detail (e.g., whether both inputs can be combined) beyond the schema. Baseline 3 for high coverage is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description names a specific verb (suggest) and resource (related subreddits) and states the input basis: seed subreddits and/or a website URL. That distinguishes it partially from discovery-style siblings, but it never contrasts itself with reddit_ads_search_communities or reddit_ads_get_communities, so an agent still has to guess which community tool fits.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

It implies usage by naming the inputs ('from seed subreddits and/or a website URL'), which is a weak usage signal. There is no statement of when to use this versus the adjacent search_communities or get_communities tools, nor any prerequisites or exclusions.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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