MCP server manifest

What is MCP server manifest?

‍MCP server manifest is the metadata file that describes an MCP server for discovery and registration, including its name, version, capabilities, and permissions. In practice, it helps clients and registries understand what a server does before they connect to it. (modelcontextprotocol.io)

Understanding MCP server manifest

‍A manifest turns a server from a local implementation into something that can be indexed, installed, and reasoned about by tooling. In the official MCP Registry, this metadata is stored in a standardized server.json format and includes discovery data such as the server’s unique name, version, description, and capabilities. The registry also uses versioning rules so clients can sort releases and identify the latest published entry. (modelcontextprotocol.io)

‍For builders, the manifest is the contract that sits between the server and everything around it, such as registry indexes, installers, and client configuration flows. Some manifest systems also express transport details, package identifiers, and configuration requirements, while registry metadata can preserve publisher-provided fields for downstream use. That makes the manifest useful both for automation and for human review. (modelcontextprotocol.io)

‍Key aspects of MCP server manifest include:

1. Identity: the server’s unique name and human-readable label tell clients what they are connecting to.
2. Versioning: each published manifest should carry a distinct version so registries can track releases.
3. Capabilities: the manifest can describe what the server supports, such as tools, prompts, or resources.
4. Permissions: required access or scope information helps clients and users evaluate trust and approval needs.
5. Install data: package or remote connection details let tooling automate setup.

Advantages of MCP server manifest

1. Better discovery: clients can find and compare servers without manual setup.
2. Cleaner installs: manifests make one-click or guided configuration possible.
3. Clearer capabilities: teams can see what a server exposes before use.
4. Safer operations: permissions and metadata support review and governance.
5. Easier distribution: registries and marketplaces can index the same server consistently.

Challenges in MCP server manifest

1. Schema drift: manifest fields can change as the ecosystem evolves.
2. Metadata quality: incomplete or outdated manifests can confuse clients.
3. Permission clarity: teams still need to explain access scopes in plain language.
4. Version discipline: publishing metadata changes cleanly takes process.
5. Ecosystem fit: different clients may support different manifest features.

Example of MCP server manifest in action

‍Scenario: a team publishes an internal ticketing MCP server and wants engineers to install it through a registry instead of copying config by hand.

‍They create a manifest with the server name, version, supported tools, and the permissions needed to read and update tickets. The registry can then list the server, and a client can show a clear installation flow that tells users what access they are granting.

‍If the team later ships a new tool or changes a permission boundary, they update the manifest and publish a new version. That keeps the discovery layer in sync with the actual server behavior and gives reviewers a single place to inspect changes.

How PromptLayer helps with MCP server manifest

‍PromptLayer helps teams keep the surrounding LLM workflow organized while they standardize server metadata. If your MCP servers are growing across multiple prompts, tools, and approval paths, PromptLayer gives you a place to manage prompts, track changes, and keep visibility into how those pieces evolve alongside the manifest.

Ready to try it yourself? Sign up for PromptLayer and start managing your prompts in minutes.