What is the adoption and standardization status of MCP Server Cards (SEP-2127)?

SEP-2127 Final (2026-10-06); the MCP Registry working group page still describes Server Cards as experimental — phase candidate, governed by Model Context Protocol project (SEP process, MCP governance). Adoption: unmeasured. Version: SEP-2127 (Final) (2026-10-06). Last verified 2026-10-19.

How does MCP Server Cards (SEP-2127) compare to other discover protocols?

MCP Server Cards (SEP-2127) is one of 17 standards at step 1, Discover (What is here, and where?). It pairs with Model Context Protocol, Official MCP Registry, AI Catalog well-known file, api-catalog: A Well-Known URI and Link Relation to Help Discovery of APIs. It builds on Model Context Protocol. Head-to-head comparisons on this site: Agentic Resource Discovery. Every standard at this step is listed at https://agenticweb.wiki/category/discover/.

MCP Server Cards (SEP-2127) Server Card

1 · Discover

MCP Server Cards (SEP-2127)
Category	Discover
Part of	Model Context Protocol
Governed by	Model Context Protocol project (SEP process, MCP governance)
Status	SEP-2127 Final (2026-10-06); the MCP Registry working group page still describes Server Cards as experimental
Phase	candidate
Implementation	prototype
Adoption	unmeasured
Version	SEP-2127 (Final) (2026-10-06)
Specification	https://github.com/modelcontextprotocol/modelcontextprotocol/blob/main/seps/2127-mcp-server-cards.md
Found at	Static JSON Server Card fetched before connecting; location defined in SEP-2127
Last checked	2026-10-19
Freshness	current · checked 2026-10-19
Solves	Let agents discover my API or service, Describe an agent's capabilities, Expose tools to agents

MCP Server Cards (SEP-2127) is an agentic-web standard (document format) at step 1, Discover, governed by Model Context Protocol project (SEP process, MCP governance); its own status is "SEP-2127 Final (2026-10-06); the MCP Registry working group page still describes Server Cards as experimental" (candidate). It answers: How can a client learn what an MCP server offers before connecting to it? Adoption is unmeasured, last verified 2026-10-19.

Discover An MCP Server Card is a static JSON description of an MCP server that a client can fetch before connecting. It is specified in SEP-2127, which reached Final on 2026-10-06 ^[1].

Overview

The MCP Registry working group is aligning the registry's server.json schema with the Server Card ^[2]. The mcp record on this site records the card path as {endpoint}/server-card; the final SEP text should be checked for the exact location before that path is relied on.

The working group page still calls Server Cards experimental, while the SEP is marked Final, so the status here is candidate until the specification release that includes it.

Discovery and probe

Static JSON Server Card fetched before connecting; location defined in SEP-2127

GET {endpoint}/server-card
parse:     A JSON document describing the MCP server. The path is the one recorded on the mcp record and may change with the final SEP.
on absent: 404 or non-JSON means no Server Card is published; the server may still be a working MCP server.

Not probed live: no-fixed-path. candidate record; probe rule pending

History

2026-10-15 — curated update 2026-10-15
2026-10-16 — use-case tags (auto)
2026-10-16 — version 2026-07-28 (watcher)
2026-10-16 — version label restored to 'SEP-2127 (Final)'; the repository tag 2026-07-28 is the MCP specification repository's revision tag, not the Server Card SEP, so the GitHub watch no longer drives version

Instances

No instances recorded yet.

Comparisons

MCP Server Cards (SEP-2127) vs Agentic Resource Discovery

References

SEP-2127 (MCP Server Cards) is marked Final as of 2026-10-06. — https://github.com/modelcontextprotocol/modelcontextprotocol/blob/main/seps/2127-mcp-server-cards.md (2026-10-06) VERIFIED
The MCP Registry working group page states that the server.json schema is being aligned with the Server Card (charter changelog entry 2026-07-30). — https://modelcontextprotocol.io/community/working-groups/registry (2026-07-30) REPORTED
2026-07-28 released 2026-10-06 — https://github.com/modelcontextprotocol/modelcontextprotocol/releases/tag/2026-07-28 (2026-10-16) VERIFIED

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