Connect MediaFast's Reddit MCP server, use five specific tools from plain prompts, and know exactly what still has to happen outside the chat.
Connect MediaFast's hosted Reddit MCP server to ChatGPT by going to Settings, then Connectors, then Add custom connector, pasting https://api.mediafa.st/mcp, clicking Add, signing in with Google, and approving. No API key is needed for this path. From there, run your Reddit marketing by asking plain-language prompts, such as "find subreddits for my product" or "draft a Reddit post for r/SaaS," and ChatGPT calls the right tool for you.
There are exactly five tools it can call: find_subreddits, generate_reddit_post, find_comment_opportunities, check_shadowban, and get_growth_roadmap. All five research, draft, or check something. None of them post to Reddit. You read what ChatGPT gives you, edit it into your own words, and post it yourself from your own Reddit account.
The setup underneath the "custom connector" screen is OpenAI's Developer Mode, which requires a Pro, Plus, Business, Enterprise, or Education plan. It is the same Model Context Protocol standard Anthropic open-sourced in 2024, which is also why this entire workflow carries over to Claude with the same server URL if you ever switch assistants.
No API key needed
The primary connection method uses OAuth with Google sign-in, not a copy-pasted secret key.
Five tools, one connector
One custom connector unlocks all five MediaFast Reddit marketing tools inside the same ChatGPT chat.
Zero auto-post tools
Every tool call researches, drafts, or checks something. Posting to Reddit is always a manual step you take yourself.
Developer Mode required
OpenAI's own docs list Pro, Plus, Business, Enterprise, and Education as the plans that support custom MCP connectors.
The whole setup happens inside ChatGPT's own settings screens, no code and no separate developer account required.
Open ChatGPT Settings, then Connectors
In ChatGPT, go to Settings, then Connectors, then Add custom connector. This is the same screen used for any custom MCP server, not something specific to MediaFast.
Paste the MediaFast MCP server URL
Paste the URL below exactly as written, then click Add.
https://api.mediafa.st/mcpSign in with Google and approve
ChatGPT will prompt you to sign in with the Google account tied to your MediaFast account, then click Approve. No API key is needed for this path, it is the primary way to connect.
Confirm it shows as connected
Once approved, the connector should show as active in your list. Start a new chat and ask something simple to confirm it is working, such as asking it to find subreddits for a product.
Prefer a Bearer API key over OAuth. That advanced option is generated from Dashboard > Settings > API keys, and is pasted into the same connector screen with authentication set to Bearer.
"Add custom connector" is the front door, but the feature underneath it is what OpenAI calls Developer Mode, and it is worth understanding what that actually turns on. Per OpenAI's own documentation, Developer Mode is available to Pro, Plus, Business, Enterprise, and Education account holders on the web, and it is enabled from Settings, then Security and login, by toggling Developer Mode on. That toggle is what unlocks full Model Context Protocol client support, meaning ChatGPT can call any tool a connected server like MediaFast's exposes, not just a pre-approved subset.
OpenAI is explicit that this carries more responsibility than a typical setting. Its documentation describes Developer Mode as having "elevated risk," and calls out prompt injection, model errors on write actions, and malicious MCP servers as real concerns for any server you connect, not just MediaFast's. In practice this is why ChatGPT asks you to confirm before a tool runs a write action, and why it is worth reading what a tool is about to do before approving it, the same instinct that makes the human-in-the-loop posting workflow on this page work in the first place.
None of MediaFast's five tools perform a write action against Reddit itself, they research, draft, or check status, which is a lower-risk category than a tool that could, for example, delete or modify content somewhere. But ChatGPT's permission system still applies to how you approve any tool call, so understanding what Developer Mode is actually asking you to trust makes the whole connector setup less mysterious.
Once the connector is approved, these are the only five actions ChatGPT can trigger through MediaFast. Everything else in a Reddit marketing workflow, actually posting, replying, moderating your own account, stays with you.
find_subreddits
Returns subreddit candidates that already discuss the kind of problem your product solves.
generate_reddit_post
Drafts a post for a specific subreddit and tone. You still read it, edit it, and post it yourself.
find_comment_opportunities
Surfaces existing threads where a genuine reply from you would be relevant and useful.
check_shadowban
Checks whether a given Reddit account is currently shadowbanned.
get_growth_roadmap
Builds a longer-term plan for growing an account or a product presence on Reddit.
The reason a custom connector can hand ChatGPT five working Reddit tools is a protocol called MCP, the Model Context Protocol. Anthropic open-sourced it in November 2024 as a standard way for an AI assistant to call outside tools without a custom integration built for every single pairing of app and assistant. OpenAI adopted the same standard for ChatGPT's connectors and Developer Mode, which is exactly why a server built once, like MediaFast's, works the same way in ChatGPT as it does in Claude.
In practice, an MCP server like MediaFast's is a small program that exposes a fixed list of "tools," each with a name, a description, and defined inputs, that any MCP-compatible client can call. MediaFast's server exposes exactly five: find_subreddits, generate_reddit_post, find_comment_opportunities, check_shadowban, and get_growth_roadmap. The protocol itself does not know or care what those tools do internally, it just standardizes how ChatGPT asks for them and how results come back. That is also why the missing sixth tool, one that would post to Reddit automatically, is a deliberate product decision by MediaFast rather than a limitation of MCP itself. The protocol would support a submit_post tool exactly the same way it supports the five that exist.
Because MCP is an open standard rather than something proprietary to OpenAI or Anthropic, you are not learning a ChatGPT-specific integration by connecting MediaFast this way, you are using a pattern that already works the same in Claude Desktop, claude.ai, and developer tools like Cursor.
You do not need to know the tool names. ChatGPT maps a plain-language request to the right one. These examples show which tool actually fires behind each kind of prompt.
"Find subreddits where people are already talking about problems my product solves."
"Suggest three subreddits I have not tried yet that fit a project management SaaS."
"Draft a Reddit post introducing my SaaS to r/SaaS without sounding like an ad."
"Write a shorter, more casual version of that post for r/startups instead."
"Find threads this week where I could add real value and mention my product naturally."
"Check this Reddit account for a shadowban before I post anything else from it."
"Build me a 30-day Reddit growth roadmap for a bootstrapped SaaS with no existing presence."
"Find two threads from the last week where a genuine reply about my product would actually help someone, not just promote it."
Connect MediaFast's Reddit MCP server once, then ask for subreddits, drafts, comment opportunities, and shadowban checks whenever you need them.
Here is what a full session looks like, from connecting the tool to a post actually going live on Reddit.
"Build me a 30-day Reddit growth roadmap for a bootstrapped SaaS with no existing presence."
Calls get_growth_roadmap and returns a phased plan: which weeks to spend commenting, when to attempt a first post, and how to pace it.
"Find subreddits where people are already talking about problems my product solves."
Calls find_subreddits and returns a shortlist with a short reason each one fits.
Open two of the suggested subreddits in a browser tab, skim recent posts, pick one.
"Draft a Reddit post introducing my product for r/SaaS, no ad language."
Calls generate_reddit_post and returns a draft tuned to that subreddit.
Rewrite two sentences that sound generic, add a specific detail about why you built the product.
Post the edited draft on Reddit yourself, from your own logged-in account.
"Check this account for a shadowban before I comment anywhere else."
Calls check_shadowban and reports the current status.
"Find me two threads worth replying to this week."
Calls find_comment_opportunities and returns specific threads with the reason each one is relevant.
The five tools work from plain language, but a few habits make ChatGPT pick the right tool and return something more useful on the first try.
Name your product and audience up front
find_subreddits works from context. "Find subreddits for my product" returns less useful results than "Find subreddits for a project management SaaS aimed at small agency owners."
Ask for one tool at a time while you learn the workflow
A single prompt like "handle my Reddit marketing" asks ChatGPT to chain several tool calls with no feedback in between. Breaking it into find subreddits, then draft, then check shadowban gives you a chance to redirect before a bad first step compounds.
Reference the subreddit by name once you have picked one
generate_reddit_post tunes its draft to a specific community's tone. "Draft a post for r/SaaS" produces a more targeted result than "draft a Reddit post" with no subreddit named.
Ask it to explain why, not just what
Adding "and explain why each one fits" to a find_subreddits or find_comment_opportunities prompt gives you the reasoning to sanity-check the suggestion yourself, instead of a bare list you have to research from scratch anyway.
Treat a bad first result as a prompting problem, not a broken connector
If a draft reads generic, the fix is usually a more specific follow-up prompt, more detail about your product, your audience, or the tone you want, rather than assuming the tool itself failed.
One session, like the one above, is not the whole strategy. This is the loop that turns it into an ongoing channel.
Start with the roadmap, not a single post
Ask get_growth_roadmap for a starting plan before you draft anything. It gives the rest of the session a direction instead of one-off requests.
Narrow down subreddits before you draft
Run find_subreddits, then actually open two or three of the suggested communities yourself and skim recent posts before you commit to one.
Draft, then rewrite in your own words
Ask generate_reddit_post for a first draft, then rewrite the parts that sound generic. This is the step that determines whether a post reads as authentic.
Post it yourself, outside the chat
There is no tool that submits to Reddit. Open Reddit in a separate tab, paste your edited draft, and post it from your own account.
Come back for comment opportunities on a cadence
Ask find_comment_opportunities every few days rather than once. Reddit rewards accounts that show up consistently, not accounts that burst all their activity into one session.
Run a shadowban check before any new push
Before a bigger promotional push, ask check_shadowban so you are not investing time posting from an account that is already invisible to other users.
None of this is a magic fully-automated growth machine, and it should not be sold as one. Here is exactly what this setup does not do.
No auto-posting, ever
None of the five tools submit content to Reddit. If a workflow needs something published, that step is yours.
Custom connectors need a compatible ChatGPT plan
Adding a custom MCP connector in ChatGPT is a feature of paid ChatGPT plans with connector or developer settings enabled, not the free tier.
Scoped to your MediaFast plan
The tools only do what your MediaFast account and plan allow. A free trial gets a limited taste, a paid plan unlocks the full workflow.
Drafts still need a human edit
A generated post or comment reply is a starting point tuned to the general tone of a subreddit, not a finished, submission-ready piece of copy.
Write actions ask for confirmation
ChatGPT's Developer Mode surfaces a confirmation step before a tool performs a write action. None of MediaFast's tools write to Reddit, but this is how the permission model behaves for any connector.
The honest version of this workflow is a research and drafting speed-up, not a replacement for judgment. Tools like MediaFast are built around that split on purpose, so the parts that carry real risk to your account stay in your hands.
This is not a hypothetical risk you are being warned about for effect. In July 2026, Reddit publicly detailed a new push against inauthentic activity, and reporting on that push put real numbers on the scale of the problem. Reddit is now blocking roughly 23 million spam views and revoking nearly 2 million inauthentic votes every single day, according to Forbes' coverage of the crackdown. Whatever workflow you run out of ChatGPT, it runs inside that enforcement environment.
The specific threat Reddit is racing to catch is more subtle than old-style spam bots. Researchers at Cornell found that a snippet of text as short as thirteen words, embedded naturally inside a Reddit comment, was enough to influence what an AI system says when it later summarizes or cites that thread, a practice sometimes called generative engine optimization or GEO. That is exactly the kind of pattern a naive auto-posting bot risks producing by accident, repeated phrasing, unnatural keyword density, something a person reading their own draft before posting would simply rewrite.
The practical takeaway for a ChatGPT workflow specifically is that speed is not the goal. Getting a subreddit shortlist or a first draft back in seconds is a genuine time saver, but the value of that speed depends entirely on what happens after ChatGPT responds: you reading it, editing it, and deciding whether it is worth posting at all.
Reddit's own help center is explicit about what happens to an account flagged for spam, inauthentic activity, or ban evasion. Reddit's support article on the topic confirms this class of ban can be temporary or permanent, and while it stands you lose the ability to vote, post, comment, message other users or subreddits, report content, create communities, or edit anything you have already posted. Reddit gives itself up to six months from the ban to review an appeal, which is not a fast recovery for an account you were using to grow a product.
Reddit also publishes a separate Responsible Builder Policy aimed specifically at apps, bots, and AI agents that touch Reddit data or accounts. It states plainly that apps must not engage in spamming activity through automated posts, comments, or direct messages, and must not circumvent safety mechanisms such as bans or blocks. That policy is exactly why the ChatGPT connector described on this page never includes a tool that submits to Reddit, doing so would put MediaFast and every account connected to it on the wrong side of Reddit's own rules for automated tools.
None of this means AI has no place in a ChatGPT-driven Reddit strategy. It means the one action Reddit's policy explicitly targets, unattended automated posting, is the one action this connector structurally cannot perform, because there is no tool that does it.
Even a well-written, human-edited draft can still get an account flagged if it is one of too many promotional posts in a row. Reddit's long-standing guidance, often called the 90/10 rule, is to keep roughly 9 out of every 10 pieces of activity, comments included, non-promotional, and reserve promotional posts for the remaining slice. It is a benchmark moderators reference constantly, not a hard line Reddit enforces automatically, but an account that ignores it entirely reads as spam regardless of how any single post is worded.
What breaks the ratio
Asking ChatGPT for a fresh promotional draft every session and posting each one, without also spending time genuinely participating in threads that have nothing to do with your product.
What protects the ratio
Using find_comment_opportunities regularly to reply to threads with no promotional angle at all, so the account has real, varied history before it ever posts something promotional.
This is one more reason an auto-post tool built into ChatGPT would be dangerous rather than convenient. Pacing promotional content against genuine participation is a judgment call about an account's entire history, not something any single generated draft can account for on its own. That judgment has to stay with the person who can see the whole account, which today means it stays with you.
Nothing stops a developer from standing up their own MCP server against Reddit's API and pointing ChatGPT's Developer Mode at it directly. OpenAI's documentation supports exactly that, a public HTTPS endpoint exposing an MCP-compatible tool list is all a custom connector needs. The question is whether that effort buys you anything the hosted MediaFast connector does not already provide.
Building it yourself still means requesting Reddit API access, agreeing to the same Responsible Builder Policy, respecting the same rate limits, and building your own subreddit ranking, drafting, and shadowban-checking logic from scratch, since Reddit's raw API does not do any of that for you. It also means you inherit OpenAI's own warning about Developer Mode at full force: a self-hosted server you wrote yourself carries the same prompt injection and write-action risks as any other, minus a team dedicated to keeping it aligned with Reddit's current rules as they change.
Pointing ChatGPT at https://api.mediafa.st/mcp instead skips that build entirely. You get the same five tools, find_subreddits, generate_reddit_post, find_comment_opportunities, check_shadowban, and get_growth_roadmap, already built around Reddit's actual norms, without maintaining a server or re-reading Reddit's policy updates yourself every time they ship.
Most friction with this workflow comes from one of these five slips, not from the tools themselves.
Do This
Add the connector from ChatGPT's own Settings > Connectors screen, not a third-party extension.
Sign in with the Google account that is actually tied to your MediaFast account.
Ask for one tool call at a time when you are new to the workflow, so you can see what each one returns.
Rewrite generated drafts in your own words before you post them anywhere.
Treat the connector as one input to your Reddit strategy, alongside reading subreddit rules yourself.
Review what a tool is about to do before approving a write-action confirmation in Developer Mode.
Not This
Search for an unofficial browser extension claiming to add MCP support instead of using ChatGPT's built-in connector settings.
Approve the connector with a different Google account and then wonder why the tools return nothing useful.
Ask a single vague prompt like "do my Reddit marketing" and expect ChatGPT to chain five tool calls perfectly on the first try.
Copy a generated draft directly into Reddit without changing a single word.
Assume the connector knows a subreddit's current rules better than the subreddit's own sidebar does.
Click approve on every confirmation prompt out of habit, without reading what it actually says.
The same five tools, three different places to trigger them. Pick based on where you already spend your time.
No. Adding a custom connector is done from ChatGPT's own Settings, not a separate developer portal, though it does require a ChatGPT plan that includes custom connector access.
Yes. The same MediaFast MCP server URL and the same OAuth sign-in work as a custom connector in both, so the prompts and the tools behave the same way in either assistant.
The assistant will answer from its own general knowledge instead, since it can only call MediaFast's tools for what those tools actually do: subreddit discovery, drafting, comment discovery, shadowban checks, and growth roadmaps.
A free trial gives a limited taste of the tools. A paid MediaFast plan is what unlocks the full workflow across all five tools without the limits of the trial.
Per OpenAI's own documentation, Developer Mode, the feature underneath custom connectors, is available to Pro, Plus, Business, Enterprise, and Education accounts on the web. It is not available on the free tier.
Yes. Reddit's own July 2026 enforcement update, covered by Forbes, describes blocking roughly 23 million spam views and revoking nearly 2 million inauthentic votes per day, which makes an unattended auto-post workflow a worse idea today than it used to be.
Nine terms worth knowing before you connect ChatGPT to Reddit marketing tools.
The setting inside ChatGPT (and Claude) where you register a new MCP server by pasting its URL and authorizing access, in this case via Google sign-in.
Model Context Protocol, an open standard that lets an assistant call external tools, like MediaFast Reddit marketing tools, from inside a chat instead of switching to a dashboard.
The moment an assistant actually invokes one of the five MediaFast tools in response to your prompt, rather than answering from its own general knowledge.
The output of get_growth_roadmap, a structured, longer-term plan for building a presence on Reddit rather than a single one-off action.
The output of check_shadowban, confirming whether an account posts and comments are currently hidden from other users without visible notice.
The primary way to authorize MediaFast MCP, using an existing Google account instead of generating and pasting an API key.
OpenAI's setting that unlocks full MCP client support in ChatGPT, including custom connectors like MediaFast's. Available on Pro, Plus, Business, Enterprise, and Education accounts on the web.
Reddit's official rulebook for apps, bots, and AI agents that access Reddit data or accounts, covering spam, rate limits, and prohibited automation.
The practice of shaping content, including Reddit comments, specifically to influence what AI chatbots say when they summarize or cite it later. Reddit has flagged this as a growing 2026 enforcement target.
Primary sources for everything claimed above, from the protocol MediaFast's ChatGPT connector is built on to Reddit's own rules for bots and AI agents.
What is the Model Context Protocol (MCP)?
modelcontextprotocol.io
The official documentation explaining what MCP is, why it exists, and how AI applications use it to call outside tools.
Introducing the Model Context Protocol
Anthropic
The original November 2024 announcement open-sourcing MCP, the standard MediaFast's ChatGPT connector is built on.
Developer mode and MCP apps in ChatGPT
OpenAI Help Center
OpenAI's own explanation of Developer Mode, eligibility, and how custom MCP connectors work inside ChatGPT.
Connect from ChatGPT
OpenAI Developers
OpenAI's technical walkthrough for connecting a remote MCP server, the same pattern MediaFast's connector uses.
Responsible Builder Policy
Reddit Help
Reddit's official rules for apps, bots, and AI agents that touch Reddit data or accounts, including the ban on automated spam posting.
My account was banned for spam, inauthentic activity, or ban evasion
Reddit Help
What actually happens to an account once Reddit flags it for this category of violation, including the appeal window.
Reddit Cracks Down On Bots And Spam, But AI Search Manipulation May Be Harder To Stop
Forbes
Reporting on Reddit's July 2026 enforcement numbers and the harder problem of AI-targeted manipulation in comments.
Introduction to the Model Context Protocol (MCP) by Anthropic
YouTube
A video walkthrough of how MCP connects an assistant to outside tools, for anyone who prefers watching over reading docs.
Go deeper on connecting AI assistants to Reddit marketing and posting safely.
Common questions about connecting MediaFast MCP to ChatGPT and running the workflow.
Connect MediaFast's Reddit MCP server as a custom connector in ChatGPT Settings using the URL https://api.mediafa.st/mcp, sign in with Google, and approve it. From there, ask plain-language prompts such as "find subreddits for my product" or "draft a Reddit post for r/SaaS," and ChatGPT calls the right MediaFast tool. You still read every draft and post it yourself, there is no auto-publish step.
find_subreddits for discovery, generate_reddit_post for drafting, find_comment_opportunities for reply-worthy threads, check_shadowban for account health, and get_growth_roadmap for a longer-term plan. All five are scoped to your MediaFast account and plan.
No, not for the primary path. Settings > Connectors > Add custom connector, paste the server URL, click Add, sign in with Google, and approve. A Bearer API key from Dashboard > Settings > API keys exists as an advanced alternative if you need it.
No. None of the five tools submit content to Reddit. ChatGPT can research subreddits, draft posts and comments, and check account health, but publishing is always a manual action you take on Reddit itself.
Ask for a growth roadmap, ask for subreddit suggestions, pick one and ask for a draft, rewrite that draft yourself, post it on Reddit, then come back later for comment opportunities and a shadowban check before your next push.
Yes. The same server URL and the same Google sign-in work as a custom connector in Claude Desktop and claude.ai, so the workflow and the prompts carry over directly if you switch assistants.
Developer Mode is OpenAI's setting that gives ChatGPT full MCP client support, which is what lets it call MediaFast's five tools at all. You do not need to understand its internals to use MediaFast MCP, but it is worth knowing it exists, since OpenAI's own documentation describes it as carrying elevated risk and requires Pro, Plus, Business, Enterprise, or Education access.
Because that is the actual, honest answer. Reddit's Responsible Builder Policy explicitly prohibits automated posting, and Reddit's own 2026 enforcement numbers show it is actively catching more of it, not less. A workflow that hands ChatGPT the drafting and research, while keeping the publish action with a person, is the version that survives contact with those rules.