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reddit-mcp

reddit-mcp

by brettadams0
OverviewSchemaSourceRelated ServersDiscussionsAdmin
JavaScript
Remote

Submit a post

reddit_submit_post

Submit a post to a subreddit with title and optional text or URL. Posts are created instantly without a confirmation step.

Instructions

Creates a real post in a subreddit immediately. No confirmation step.

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>",
      "title": "<title>"
    },
    "name": "reddit_submit_post"
  }
}

Input Schema

NameRequiredDescriptionDefault
urlNoLink-post URL. Omit if using text.
textNoSelf-post body (markdown). Omit if using url.
titleYes
subredditYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

B3.4/5.0
Behavior3/5

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

Discloses it is a write action that executes immediately with no confirmation, but lacks details on side effects, permissions, or rate limits.

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 with no wasted words, communicates essential purpose efficiently.

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 value, error cases, or validation, leaving users uninformed about what the tool returns.

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?

The description adds value by explaining mutual exclusivity of url and text, but subreddit and title lack description beyond 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 clearly states it creates a real post in a subreddit immediately with no confirmation, distinguishing it from siblings like reddit_submit_comment.

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 explicit guidance on when to use this tool vs alternatives, nor prerequisites or when not to use it.

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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