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Yes—with an important distinction. The Model Context Protocol (MCP) is an open-source standard: its specification, schema, documentation and SDK ecosystem are publicly developed. An “MCP server,” however, is any implementation that speaks that protocol. Each server can be open source, source-available, mixed, proprietary or hosted-only. Check the particular server’s repository, license, dependencies and service terms before you deploy it.
MCP protocol versus an MCP server
Anthropic announced MCP on November 25, 2024 as an open standard for two-way connections between AI applications and external systems. The official documentation describes MCP as an open-source standard for connecting AI applications to external systems. That statement applies to the protocol project, not automatically to every server that uses it.
An MCP server is a program that exposes tools, resources or prompts through MCP. It might run on your laptop, inside your network, in a container, or behind a vendor’s hosted endpoint. The protocol does not require the implementation to publish its source code. A closed server can speak an open protocol just as a proprietary web application can use HTTP.
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| Server category | What you can inspect | Typical deployment implication |
|---|---|---|
| Fully open source | Complete source is published under a stated license, including the code needed to build and run the server. | You can usually self-host within the license terms, audit the code and modify it. Dependencies and external APIs still have their own licenses and policies. |
| Source-available or mixed | Some code is public, while plugins, dependencies, deployment controls or hosted components have separate terms. | You may be able to run part of it locally, but need to verify which components are redistributable and which require a vendor service. |
| Proprietary or hosted | The endpoint is available as a service, but the implementation is not published. | You depend on the provider for operation, updates, data handling and availability. Open-protocol compatibility does not change those obligations. |
A registry listing, an npm package, or compatibility with an open SDK does not prove that a server is open source. Confirm the exact repository, release tag or commit, license files and any hosted-service terms.
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Licenses used by the official MCP projects
Specification and documentation
The official specification and documentation repository states that it is licensed under the MIT License. MIT is a permissive license, but you still need to preserve its notices and comply with the exact text in the version you use.
Reference servers
The official reference-server repository contains a small set of implementations rather than every server in the ecosystem. Its current notice says new contributions are under the Apache License 2.0, while existing code remains under MIT. That mixed history means you should read the repository’s license notice and the files for the particular component and revision you intend to ship.
Dependencies and APIs
Your compliance review cannot stop at the top-level license. Check per-package licenses, transitive dependencies, container images, model SDKs and the terms of every API the server calls. A server may be MIT-licensed while the database, SaaS API or data set it accesses imposes separate restrictions, fees or data-processing requirements.
Can you self-host an MCP server?
Often, yes. Self-hosting is a property of the implementation and its dependencies, not of MCP itself. A server that publishes build instructions and permits local use can run on a workstation, VM or container. A hosted-only server cannot be self-hosted merely because it uses MCP.
Questions to answer before deployment
- Is the complete source and build process available, or is a hosted component required?
- Which transport does the release support, and does your MCP client support the same protocol version?
- What credentials, filesystem paths, network destinations and account scopes does it require?
- Can you run it without sending prompts, documents or tool results to a third party?
- Are the license terms compatible with your distribution model, including internal resale or SaaS use?
- Can you pin a release or commit and reproduce the build?
For a local deployment, run the process under a dedicated account or container, expose only the required transport, and grant the smallest useful set of permissions. Keep secrets outside source control and rotate them as you would for any integration.
Does open source make an MCP server safe for production?
No. Public source improves inspectability; it does not provide a security audit, a support contract or a production guarantee. The official reference-server README explicitly says its servers are educational examples that demonstrate MCP features and SDK usage, not production-ready solutions. It also tells developers to evaluate their own security requirements and add safeguards for their threat model.
Production controls to require
- Least privilege: issue narrowly scoped tokens and restrict filesystem, database and cloud permissions.
- Isolation: place untrusted or high-impact tools in a container, VM or separate account with egress controls.
- Input and output validation: enforce schemas, size limits, allow-lists and safe handling of tool results before an agent can act on them.
- Secret handling: use a secret manager, redact logs and prevent tool output from echoing credentials.
- Auditability: record who invoked a tool, what arguments were supplied and what external side effect occurred.
- Dependency management: scan dependencies, pin versions and subscribe to security advisories for the runtime and libraries.
- Human approval: require confirmation for destructive actions such as deleting data, sending messages or changing production configuration.
Review the server’s issue history, security policy, release cadence and maintainer responsiveness. Source visibility is evidence you can evaluate; it is not evidence that someone else has evaluated it for you.
How MCP governance affects compatibility
MCP is an evolving project rather than a frozen file format. A governance announcement published July 31, 2025 by lead maintainer David Soria Parra describes Specification Enhancement Proposals (SEPs), maintainers, core maintainers and lead maintainers. Maintainers oversee components such as SDKs and documentation; core maintainers guide the specification; lead maintainers make final decisions for project health; and maintainers form the steering group. Meeting notes and decisions are intended to be public.
For an engineering team, open governance means you can see proposed changes and decisions, but it does not remove version-management work. Pin the specification and SDK versions you support, read changelogs, test a client and server together, and upgrade in a staging environment before changing production.
A practical upgrade process
- Record the server commit or release, MCP specification version and client SDK version currently deployed.
- Read the release notes and any relevant SEP or compatibility notice.
- Run contract tests for initialization, tool discovery, authentication, errors and the highest-risk actions.
- Verify that permissions and outbound network rules remain unchanged after the upgrade.
- Roll out gradually with a rollback artifact for the previous version.
Where to find official or community servers
The MCP Registry preview launched on September 8, 2025 as an official open catalog and API for publicly available servers. The registry and its parent OpenAPI specification are open source and permissively licensed. It supports public and private sub-registries and community reports for spam, malicious code or impersonation.
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Because the release is a preview, entries and APIs may change. The launch notice provides no data-durability or warranty guarantees before general availability. Treat the registry as a discovery and distribution source, not as a security certification, code review or production endorsement. Registry maintainers can denylist entries that violate moderation guidelines, but a listing alone does not establish trust.
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- Open the exact repository named by the entry and verify the publisher.
- Record the release date and pin a tag or commit rather than tracking an unbounded main branch.
- Read the top-level and per-package licenses; map dependencies to compatible terms.
- Determine whether the server is local, remotely operated or dependent on a hosted provider.
- List every credential and permission, then remove anything not required for the intended tools.
- Review security documentation, open issues, release activity and maintainer responses.
- Test protocol and SDK compatibility in an isolated environment before connecting sensitive data.
Example: GitHub’s official open-source server
On April 4, 2025, GitHub announced a new 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 a useful example of a vendor publishing an open-source server; it is not evidence that every vendor’s server is open source.
The server’s source license does not replace GitHub’s separate authentication rules, API limits, account terms or data policies. Apply the same review to any vendor-backed implementation: inspect the server’s repository and license, then separately assess the service it calls.
How to compare two MCP servers
When two implementations provide similar tools, compare them on the dimensions that affect your deployment rather than on protocol compatibility alone.
| Axis | Questions to ask |
|---|---|
| License and source completeness | Is all required code available? Are licenses compatible with your use and distribution? |
| Deployment | Does it run locally, remotely or only through a hosted provider? What data leaves your network? |
| Permissions and secrets | Which scopes, tokens, files and network destinations are required? |
| Maintenance | Who publishes releases? How active are issues, security fixes and reviews? |
| Protocol and SDK support | Which MCP and SDK versions are tested together, and is there a migration path? |
| Dependencies and API terms | Do downstream libraries, models or SaaS APIs add license, quota or data-processing constraints? |
| Security evidence | Is there a threat model, security policy, audit report or reproducible build? |
| Discovery status | Is it merely registry-discovered, or maintained and supported by the vendor? |
Troubleshooting common MCP server decisions
“The repository is public, so can I call it open source?”
Not necessarily. Look for an OSI-recognized or otherwise explicit license, complete buildable source and terms for bundled assets. “Source available,” a public container or an unlicensed repository does not grant the same rights.
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“The registry lists it, so is it safe?”
No. Validate the publisher, commit, dependencies, permissions and security history yourself. A registry listing is a discovery signal.
“The server worked, but my client now fails after an upgrade.”
Compare the pinned MCP and SDK versions, read changelogs and test initialization and tool schemas. Roll back to the last known-good commit while you isolate the compatibility change.
“Self-hosting still sends data to a vendor.”
Inspect outbound requests and the server configuration. A locally running process may call a hosted model, database or API. Block unnecessary egress, document the remaining provider terms and use a local alternative only when its license and operational requirements fit.
“A reference server has a permissive license. Can I deploy it unchanged?”
The license may allow reuse, but the maintainers’ warning that the examples are educational still applies. Add authentication, isolation, logging, validation and threat-model-specific controls before production use.
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Frequently Asked Questions
Is MCP proprietary to Anthropic?
No. Anthropic introduced MCP, but the project is presented as an open-source standard with public specifications, SDKs and governance. Individual servers can still be proprietary.
Does MIT licensing allow commercial use of an MCP server?
Generally, MIT permits broad reuse subject to its notice and disclaimer requirements, but verify the exact component, version and all dependency and service terms before commercial deployment.
Can a hosted MCP server be called open source?
Only if the implementation is actually published under an applicable license. Hosted availability or protocol compatibility alone does not make source code open.
Should I pin an MCP Registry entry in production?
Pin the repository release or commit and validate it independently. The Registry preview is for discovery and may change; its listing is not a security endorsement.
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