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reddit-mcp

reddit-mcp

by brettadams0
OverviewSchemaSourceRelated ServersDiscussionsAdmin
JavaScript
Remote

Get subreddit posts

reddit_get_subreddit_posts

Retrieve posts from a specified subreddit feed, choosing from hot, new, top, or rising categories.

Instructions

List posts from a subreddit feed (hot, new, top, rising).

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "subreddit": "<subreddit>"
    },
    "name": "reddit_get_subreddit_posts"
  }
}

Input Schema

NameRequiredDescriptionDefault
feedNo
timeNo
limitNo
subredditYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

B3.1/5.0
Behavior2/5

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

No annotations are provided, and the description only says 'list posts' without disclosing side effects, authentication needs, rate limits, or return behavior. Minimal behavioral context.

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

Conciseness5/5

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

Single sentence, front-loaded, efficient. No wasted words.

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

Completeness2/5

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

No output schema, and description omits return format, pagination, or default behavior. Incomplete for a tool with 4 parameters.

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

Parameters2/5

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

Schema description coverage is 0%, and the description only names feed types. It does not explain 'time', 'limit', or 'subreddit' parameters, failing to add meaning beyond the schema.

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

Purpose5/5

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

The description explicitly states 'List posts from a subreddit feed (hot, new, top, rising)', providing a clear verb and resource, and distinguishes from siblings like reddit_search and reddit_get_post.

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?

No guidance on when to use this tool versus alternatives (e.g., reddit_search). Lacks context about prerequisites or use cases.

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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