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Sometimes—but not because they use MCP. The Model Context Protocol (MCP) is an open-source standard, while each MCP server is a separate implementation with its own source code, license, dependencies, and operating model. Check the particular server before assuming you can inspect, modify, or self-host it.
What “open source” means for MCP
MCP is the protocol that lets AI applications connect to external systems. Anthropic announced it as an open standard on November 25, 2024, and released the specification, SDKs, and server repository publicly. The current Model Context Protocol documentation describes MCP as an open-source standard for connecting AI applications to external systems.
That answers whether MCP itself is proprietary: the protocol project is open source. It does not answer whether any particular server is open source. A server is software that implements the protocol and connects to a service, data source, or tool. Its publisher decides how that implementation is distributed and licensed.
| What you are evaluating | What openness tells you | What it does not establish |
|---|---|---|
| MCP protocol and specification | The protocol and its public project materials are available as an open standard. | That every compatible server publishes its source or uses the same license. |
| A specific server repository | Its license and source determine what you may inspect, modify, and redistribute. | That its dependencies, hosted services, or data terms have identical conditions. |
| A server listing in a catalog | The listing may help you discover a server. | That the server is open source, secure, audited, or production-ready. |
How MCP server licensing varies
MCP servers may be fully open source, source-available or mixed, or proprietary and hosted. These are practical categories rather than a claim that every project fits neatly into one label: read the actual license and deployment terms for the version you intend to use.
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- Fully open source: The implementation is published under a stated license. You can generally run or change it subject to that license’s conditions. Confirm that the necessary components are included and that self-hosting is permitted.
- Source-available or mixed: Some source is public, but a plugin, dependency, hosted API, or deployment component may have separate terms. Public code alone does not guarantee that the complete system can be self-hosted.
- Proprietary or hosted: A provider offers an MCP endpoint or service without publishing the implementation. It may still interoperate with the open protocol; compatibility does not make the server source open.
The official specification and documentation repository states that it is licensed under MIT. The official reference-server repository has a different notice: new contributions are under Apache License 2.0, while existing code remains under MIT. Do not generalize either license to the entire MCP ecosystem—or even to a different repository maintained by the same organization.
Before adopting a server, check its top-level LICENSE, any per-package license notices, and the licenses of its dependencies. Also find out whether it calls a paid API, requires a hosted component, or is governed by separate provider terms for data processing and use. A project can be open source while the service it connects to remains separately controlled.
Can you self-host an MCP server?
Often, if the specific implementation provides source or a distributable build and its license and dependencies allow the deployment you need. “MCP server” describes a role, not a deployment location: a compatible server may run locally, remotely, or as part of a hosted service. Check its setup instructions and terms rather than inferring self-hosting support from the protocol.
Self-hosting gives you control over where the server runs, but it also makes you responsible for deployment, updates, secrets, access controls, and monitoring. A hosted server may reduce that operational work but requires you to assess the provider, the data sent to it, and its service terms. Neither model is automatically safer; the right choice depends on your data sensitivity and threat model.
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Are the official reference servers ready for production?
No: the official reference-server repository explicitly says its servers are educational examples intended to demonstrate MCP features and SDK usage, not production-ready solutions. The repository also warns developers to evaluate their own security requirements and add safeguards for their threat model.
Use reference implementations to understand patterns and explore protocol features, not as a substitute for production review. Before deploying any server, determine what tools it exposes, what information those tools can read or change, how credentials are supplied, and what protections apply to tool calls. A useful security boundary is least privilege: give a server only the data and actions it needs, and isolate it from unrelated systems.
How to evaluate an MCP server before using it
- Verify identity and version. Find the publisher’s canonical repository, then record the release tag or commit you plan to run. Check that the package or registry entry points to the expected project.
- Read the license and distribution terms. Inspect the repository license, per-package notices, dependency licenses, and any terms for hosted APIs or managed deployments. Confirm the intended use—especially modification, redistribution, and self-hosting—is allowed.
- Map the deployment and data path. Establish whether it runs locally, remotely, or through a provider. List the systems it contacts and the information it sends or receives.
- Review credentials and permissions. Identify every secret the server needs and what those credentials can do. Prefer narrowly scoped permissions; avoid exposing broad account access to a tool that needs only a small subset.
- Assess maintenance and security signals. Read the security policy, issue history, release activity, and maintainer responses. Look for evidence relevant to the version you will use; an open repository by itself is not an audit.
- Test compatibility and upgrades. Pin the specification or SDK version used by your integration where practical. Test a proposed upgrade against your client and server before rolling it into production.
- Keep discovery separate from approval. Treat a directory listing as a way to find candidates, then perform your own license, security, and compatibility checks.
Governance and protocol changes
MCP is an evolving project, not a frozen interface. In a July 31, 2025 governance announcement, lead maintainer David Soria Parra described the adoption of Specification Enhancement Proposals (SEPs). The project structure includes maintainers for components such as SDKs and documentation, core maintainers who guide the specification, and lead maintainers responsible for final decisions about project health. Maintainers form the steering group, and meeting notes and decisions are intended to be public.
That formal process helps developers follow how the standard changes, but openness does not remove upgrade risk. For a production integration, pin the version you have validated, watch relevant changelogs and decisions, and test compatibility before changing SDKs or protocol versions. Confirm that both ends of your connection support the capabilities you rely on rather than assuming that every server adopts a change at the same time.
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Where to find servers—and what a listing proves
The MCP Registry preview launched on September 8, 2025 as an official catalog and API for publicly available servers. The registry and its parent OpenAPI specification are open source, and the registry is permissively licensed. It supports public and private sub-registries and community reporting of spam, malicious code, or impersonation.
The preview announcement cautions that the registry may change and provides no data-durability or warranty guarantees before general availability. Its maintainers can denylist entries that violate moderation guidelines, but being listed is not a security certification or production endorsement. Verify the publisher, repository, version, license, and deployment details independently.
Example: GitHub’s official local MCP server
GitHub’s April 4, 2025 changelog announced an official open-source local GitHub MCP Server in public preview. GitHub said it worked with Anthropic to rewrite the reference server in Go, preserve its functionality, and continue development. This is an example of a vendor publishing an open-source server; it is not evidence that every vendor’s MCP server is open source.
Even when a server implementation is open source, the service it connects to has its own boundaries. For a GitHub integration, authentication, API limits, and account terms remain relevant alongside the server’s license. Review the permissions granted to the integration and check which operations the particular version exposes.
ScreenshotNeo as an MCP option for screenshot tasks
If your specific need is to let an AI agent capture website screenshots or PDFs, ScreenshotNeo offers an MCP server with the tools take_screenshot, get_page_info, and capture_pdf, for Claude, Cursor, and any MCP client. Its MCP availability does not by itself establish that the server’s implementation is open source; check the applicable source and license terms if that is a requirement. For a direct API call instead, the documented endpoint accepts a URL in one GET request; see the ScreenshotNeo API documentation.
Quick Recap
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpScreenshotNeo says it removes cookie and consent banners, newsletter popups, and chat widgets before capture, with each step configurable. Bot checks, blank pages, timeouts, failed loads, and cache hits cost nothing; responses identify page verdict and billing status in headers. Plans include 1,000 screenshots a month free with no card and paid plans starting at $5 for 3,000. If that screenshot workflow fits, sign up for the free plan.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
