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
29.9%
6,314 / 21,130

Protocol revision (negotiated)

Stateless server/discover only (no initialize)
0.6%
124 / 21,130
Speaks only 2024-11-05
3.8%
503 / 13,172
Tops out at 2025-03-26
21%
2,768 / 13,172
2025-06-18 or newer (structured output, elicitation)
75.2%
9,900 / 13,172
Answers with 2025-11-25 or newer
1.7%
230 / 13,172
2026-07-28 (stateless) revision
0.9%
121 / 13,172

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)
53.8%
8,796 / 16,337

Server capabilities

Argument completions
0.9%
136 / 15,302
Experimental capabilities
7.8%
1,189 / 15,302
Logging
3.8%
584 / 15,302
Prompts
28.6%
4,374 / 15,302
Resources
35.2%
5,388 / 15,302
Declares the tools capability
100%
15,299 / 15,302

Tool definitions

Safety annotations (readOnlyHint / destructiveHint)
58.1%
8,563 / 14,731
idempotentHint annotation
48.9%
7,204 / 14,731
openWorldHint annotation
55.2%
8,133 / 14,731
Output schemas (structured tool results) on at least one tool
32.2%
4,750 / 14,731
Human-readable tool titles
49.5%
7,285 / 14,731

FAQ

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

29.9% of 21,130 MCP servers Glimind checked (as of 2026-10-17).

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

75.2% of 13,172 MCP servers Glimind checked (as of 2026-10-17).

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

0.9% of 13,172 MCP servers Glimind checked (as of 2026-10-17).

What share of MCP servers support prompts?

28.6% of 15,302 MCP servers Glimind checked (as of 2026-10-17).

What share of MCP servers support resources?

35.2% of 15,302 MCP servers Glimind checked (as of 2026-10-17).

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

58.1% of 14,731 MCP servers Glimind checked (as of 2026-10-17).

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

32.2% of 14,731 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.