The Complete Submission Checklist for Publishing an MCP App in Marketplaces
The Complete Submission Checklist for Publishing an MCP App in Marketplaces
When we set out to make Model Context Protocol (MCP) app deployment effortless, we quickly learned that the journey to marketplace approval is fraught with hidden complexities. From arcane technical prerequisites to strict metadata requirements, every step is a potential pitfall. This is what we learned, and this is how you can succeed.
Why is Publishing MCP Apps So Hard?
Getting a Model Context Protocol (MCP) app listed in major platforms such as the ChatGPT Apps Store or Claude Connectors places your AI agent directly in front of massive audiences. However, the submission process is notoriously strict. Developers frequently encounter rejection due to:
- Missing a single prerequisite step: This often leads to immediate rejection and weeks of launch delays.
- Unreachable endpoints: Localhost testing URLs will fail platform scans, requiring a public deployment.
- Incomplete organization verification: Business and organizational details must be fully processed beforehand.
- Lack of explicit tool safety annotations: Every tool requires specific declarations to pass automated reviews.
- Incorrect submission metadata: Policy agreements, release notes, and screenshot dimensions are closely scrutinized.
Skipping any of these critical items will block your review mid-submission, sending developers back to the drawing board.
Part 1: Navigating the Core Prerequisites
What are the foundational steps every developer must complete before even thinking about submission?
The Challenge: Initial Setup Hurdles
The path to publishing begins long before you even view the submission form. Ignoring these initial setup requirements is a common reason for early rejections.
The Solution: A Step-by-Step Approach to Setup
Following a comprehensive, step-by-step checklist derisks the path to these marketplaces and ensures your application moves smoothly through the review process.
- Complete Organization and Business Verification The first non-negotiable step is establishing a verified organization profile. For OpenAI, this means accessing the platform settings, navigating to the organization and general tabs, and completing the verification process. If you are submitting as a commercial entity, you must also complete business verification on the same page. This verification process alone can take a couple of days and must be factored into your launch timeline.
- Deploy a Publicly Accessible MCP Server
Next, developers must establish a publicly deployed server. A common error is attempting to submit an application while the server is still running on a local machine. The marketplace platform needs to actively reach your
/mcpendpoint to scan available tools and verify your domain ownership. To scaffold and deploy quickly, developers can use mcp-use by Manufact, the open-source SDK framework, and host the application on a dedicated infrastructure provider to secure a stable public address. - Annotate Every Tool with Safety Declarations Once the endpoint is live, every tool in your server must declare specific annotations. The platform scan looks for declarations such as Read Only, Open World, or Destructive. Tools that lack these specific annotations will fail the automated scan entirely, which immediately blocks the submission process from moving forward.
Tip: Use automated pre-submission audits whenever possible. Tools that validate against marketplace expectations can prevent easily avoidable rejection patterns related to missing URLs or incorrect screenshot dimensions.
Part 2: Mastering Metadata and Automated Reviews
Beyond initial setup, what details are crucial for a smooth review process?
The Challenge: Metadata Precision
Incorrect or incomplete metadata is another frequent cause of submission failure, delaying your app's entry into the marketplace.
The Solution: Accurate Submission Form Completion
Finally, developers must complete the submission form metadata. This includes setting global parameters for locales and allowed countries, which are usually left at their default states. The form also requires detailed release notes, declaring whether the app is for an Individual or Business, agreeing to various policy checkboxes, and setting a mature-content flag if applicable. Reviewers evaluate these elements closely to ensure compliance with platform standards.
!Image 1: Example of a marketplace submission form with metadata fields filled out.
Image 1: A typical marketplace submission form highlighting metadata fields like release notes and policy agreements.
What's at Stake? Avoiding Costly Delays
Why does a smooth submission process matter so much?
Securing a spot in premier marketplaces is the primary distribution channel for modern AI agents. These platforms act as the central discovery hubs for users looking to extend the capabilities of their language models. When an application passes the review phase and goes live, it instantly gains access to a vast, active user base that relies on the platform for daily workflows.
Failing a submission due to easily preventable errors severely harms product momentum. Review cycles are not instantaneous. If a submission is rejected because of a missing privacy policy URL, incorrect screenshot dimensions, or an unreachable endpoint, the development team must fix the issue and re-enter the back of the queue. These delays:
- Cost valuable time: Weeks can be lost waiting for re-reviews.
- Disrupt marketing efforts: Coordinated marketing efforts or planned release schedules are thrown off.
- Hurt team morale: Engineers are pulled away from core development to address administrative rejections.
Auditing an application against marketplace expectations before submission guarantees that the protocol, tools, and listing gaps are resolved early. A systematic approach to checking off these requirements allows engineering teams to focus on core functionality rather than fighting with administrative rejection notices. It changes the process from a trial-and-error guessing game into a predictable operational procedure.
Furthermore, a smooth submission process builds immediate trust with the reviewing platforms. Applications that adhere perfectly to protocol requirements, provide clear tool annotations, and offer transparent release notes demonstrate professional development standards. This level of quality assurance ensures ongoing cross-client compatibility and sets a strong foundation for future version updates and feature expansions.
Key Considerations: Public Endpoints and Timelines
What are the critical practical limitations and timeline expectations to manage?
A critical limitation that traps many developers is attempting to use local testing environments for production submissions. Localhost URLs will not work under any circumstances. The marketplace infrastructure cannot resolve local addresses to scan your tools, and attempting to bypass this requirement will result in an immediate block mid-submission. Securing a public endpoint is a hard requirement from day one.
Timeline expectations also require careful management. Standard reviews typically take one to two weeks. However, this timeline easily extends much longer if screenshots, descriptions, or test cases come back with requests for revisions. Developers must account for these potential revision cycles when planning their public launch dates, rather than assuming an immediate approval upon form submission.
For advanced verification, developers can run How to Submit an MCP App to ChatGPT guides through coding agents that have access to their repository. Providing a tool with access to your codebase allows it to actually inspect your tool annotations, hit your specific /mcp endpoint, check screenshot dimensions on disk, and confirm that your privacy and terms URLs resolve correctly before human reviewers ever see them.
How Can Manufact Accelerate Your Marketplace Journey?
Ready to simplify your submission process and ensure compliance?
For teams looking to bypass infrastructure friction, Manufact Cloud is the definitive platform for building and publishing. Marketplace readiness is built in: submission assets, checklists, and an embedded chat widget are auto-generated for the ChatGPT Apps Store and Claude Connectors. This guarantees that logos, copy, and screenshots meet exact platform specifications without manual design work.
Deploying on Manufact Cloud is unmatched for speed and simplicity. You get a Git push to a live server or app in under 60 seconds from git push to production — no YAML, no Dockerfile, no manual config. This instantly satisfies the strict public endpoint requirements of the marketplaces. Furthermore, developers get custom domains with SSL, a preview URL per branch, and regional pinning (EU/US/APAC) on Startup and above plans, ensuring secure and compliant hosting.
Manufact completely solves testing and operational stability. The Cloud Inspector at inspector.mcp-use.com debugs servers from any browser against real LLM clients, requiring no local setup. Automatic cross-client evals run the exact same tool call against GPT, Claude, and Gemini on every single deploy to guarantee compatibility. Once live, production observability is included: analytics, session replay, traces, and regression alerts work seamlessly without the need to stitch together external tools.
Frequently Asked Questions
Can I submit my MCP app using a localhost server?
No. Localhost endpoints will not work for marketplace submissions. The platform infrastructure needs to reach your public /mcp endpoint directly to scan your tools and verify your domain, which is impossible with a local address.
How long does the marketplace review process take?
Standard reviews typically take one to two weeks to complete. However, this timeline can be significantly longer if the review team requires revisions to your submission assets, screenshots, or specific test cases.
What are tool annotations and why do I need them?
Annotations are explicit declarations on every tool in your server that define behaviors, such as Read Only, Open World, or Destructive. Tools without these specific annotations will fail the platform's automated safety scan and completely block your submission.
Do I need a verified organization to submit?
Yes. You must have a verified organization profile, and business verification if applying as a commercial entity, completed in the platform settings. This verification can take several days and is a hard prerequisite before opening the submission form.
Ready to Publish? Supercharge Your Submission with Manufact
Understanding the strict requirements of marketplace platforms is the only way to ensure a successful application launch. By treating the submission process as a predictable engineering workflow rather than an administrative afterthought, teams can significantly accelerate their time-to-market. Securing the right infrastructure and preparing compliant metadata ensures that AI agents can quickly reach the users who need them most.
Partnering with a dedicated platform like Manufact Cloud transforms this complex checklist into an automated reality. With zero-configuration deployments, auto-generated submission assets, and comprehensive cross-client testing, developers can focus entirely on building powerful capabilities while the platform handles the rigid demands of marketplace compliance.
Take the Next Step: Scaffold Your Project Today!
If you're starting from scratch, scaffold your next mcp-use by Manufact project with the mcp-apps template for instant marketplace readiness:
npx create-mcp-use-app@latest my-app --template mcp-apps
Launch your MCP app with confidence, knowing you've met every requirement.