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reddit_mcp

reddit_mcp

by ajaaysrinivaas
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Remote

post_reply

Reply to a Reddit post or comment using an authenticated browser session. Supply the URL or ID of the target and the reply content.

Instructions

Post a reply to a Reddit thread or comment using an authenticated browser session.

The browser must already be authenticated. If the session has expired, this tool will fail immediately with a descriptive error rather than waiting for a timeout.

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": {
      "url_or_id": "<url_or_id>",
      "content": "<content>"
    },
    "name": "post_reply"
  }
}

Input Schema

NameRequiredDescriptionDefault
url_or_idYesFull Reddit URL or a bare post/comment ID (e.g. "1qd9z8x")
contentYesThe text content of the reply to post

Output Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

A4/5.0
Behavior3/5

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

No annotations provided, so description must disclose behavioral traits. It covers authentication requirement and error handling but omits side effects (e.g., that a new comment is created and becomes visible) or rate limits. Adequate but not rich.

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?

Two short sentences, each essential. Front-loaded with the main action, followed by crucial prerequisites and error behavior. No wasted words.

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

Completeness4/5

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

Given the tool's simplicity (2 parameters, straightforward action) and existence of an output schema, the description covers key aspects: authentication, failure mode, and the action itself. Missing minor details like success behavior, but still complete enough for correct invocation.

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 coverage is 100%, and descriptions are already present in the schema. The tool description adds no new parameter meaning beyond what the schema provides, so baseline 3 applies.

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 the tool's action: 'Post a reply to a Reddit thread or comment.' It directly distinguishes from sibling tools (all get-oriented) by being the only write operation.

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

Usage Guidelines4/5

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

Explicitly states the prerequisite of an authenticated browser session and describes failure behavior ('fail immediately with a descriptive error'). Does not compare to alternatives, but siblings are clearly read-only, so usage context is clear.

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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