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jordanburke

reddit-mcp-server

create_post

Create a new post in a specified subreddit with a title and content, supporting both text and link submissions.

Instructions

Create a new post in a subreddit

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
contentYesContent of the post (text for self posts, URL for link posts)
is_selfNoWhether this is a self (text) post (true) or link post (false)
subredditYesName of the subreddit to post in
titleYesTitle of the post
Behavior2/5

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

With no annotations provided, the description carries full burden for behavioral disclosure. It mentions creation but fails to describe critical behaviors like authentication requirements, rate limits, error conditions (e.g., invalid subreddit), or what happens upon success (e.g., returns a post ID). This leaves significant gaps for an agent to understand how to use it safely and effectively.

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?

The description is a single, efficient sentence that directly states the tool's purpose without unnecessary words. It's front-loaded and wastes no space, making it easy for an agent to parse quickly.

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?

Given the complexity of a creation tool with no annotations and no output schema, the description is inadequate. It doesn't cover behavioral aspects like authentication, error handling, or return values, leaving the agent with insufficient information to use the tool correctly in context.

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 100%, so the schema already documents all parameters thoroughly. The description adds no additional meaning beyond implying 'subreddit' and 'post' context, which is minimal value. Baseline 3 is appropriate as the schema does the heavy lifting.

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 clearly states the action ('Create') and target resource ('new post in a subreddit'), making the purpose immediately understandable. However, it doesn't distinguish this tool from potential alternatives like 'reply_to_post' or specify what type of post (text vs. link) beyond what the schema indicates, preventing a perfect score.

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?

The description provides no guidance on when to use this tool versus alternatives like 'reply_to_post' or 'search_reddit', nor does it mention prerequisites such as authentication or subreddit permissions. It simply states what the tool does without contextual usage instructions.

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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