as of 2026-10-17 · updated daily · CC-BY 4.0

Can I use it in MCP?

How many MCP servers actually support each protocol feature today — measured across every reachable server Glimind tracks, so you know what a client can rely on and which revision to target.

Authentication

Bearer challenge (WWW-Authenticate) among sign-in servers
86.8%
5,478 / 6,314
Requires sign-in to list tools
29.8%
6,314 / 21,160

Protocol revision (negotiated)

Stateless server/discover only (no initialize)
0.6%
124 / 21,160
Speaks only 2024-11-05
3.8%
503 / 13,271
Tops out at 2025-03-26
20.8%
2,767 / 13,271
2025-06-18 or newer (structured output, elicitation)
75.4%
10,000 / 13,271
Answers with 2025-11-25 or newer
1.7%
227 / 13,271
2026-07-28 (stateless) revision
0.9%
121 / 13,271

SDKs (published packages)

Python SDK (mcp / fastmcp)
53.9%
19,070 / 35,407
TypeScript SDK (@modelcontextprotocol/sdk)
46.1%
16,337 / 35,407
TypeScript SDK range ≥ 1.20 (of TS servers)
53.9%
8,798 / 16,337

Server capabilities

Argument completions
0.9%
136 / 15,332
Experimental capabilities
7.8%
1,202 / 15,332
Logging
3.8%
587 / 15,332
Prompts
28.7%
4,404 / 15,332
Resources
35.4%
5,427 / 15,332
Declares the tools capability
100%
15,329 / 15,332

Tool definitions

Safety annotations (readOnlyHint / destructiveHint)
58.2%
8,589 / 14,759
idempotentHint annotation
49%
7,235 / 14,759
openWorldHint annotation
55.3%
8,160 / 14,759
Output schemas (structured tool results) on at least one tool
32.2%
4,754 / 14,759
Human-readable tool titles
49.6%
7,315 / 14,759

FAQ

What share of MCP servers support requires sign-in to list tools?

29.8% of 21,160 MCP servers Glimind checked (as of 2026-10-17).

What share of MCP servers support 2025-06-18 or newer (structured output, elicitation)?

75.4% of 13,271 MCP servers Glimind checked (as of 2026-10-17).

What share of MCP servers support 2026-07-28 (stateless) revision?

0.9% of 13,271 MCP servers Glimind checked (as of 2026-10-17).

What share of MCP servers support prompts?

28.7% of 15,332 MCP servers Glimind checked (as of 2026-10-17).

What share of MCP servers support resources?

35.4% of 15,332 MCP servers Glimind checked (as of 2026-10-17).

What share of MCP servers support safety annotations (readonlyhint / destructivehint)?

58.2% of 14,759 MCP servers Glimind checked (as of 2026-10-17).

What share of MCP servers support output schemas (structured tool results)?

32.2% of 14,759 MCP servers Glimind checked (as of 2026-10-17).

Shares of reachable MCP servers, from Glimind's liveness probe (handshake + tools/list; no tool is called) and published package manifests. Snapshotted daily. Data: https://glimind.com/v1/features. Protocol rows show the revision each server answers with when offered 2025-06-18 (or via server/discover). Check one server's support at https://glimind.com/check.