Probe outcomes over time
Daily outcome after removing authentication-gated endpoints and legacy catalog runs
Updated daily · Last collection September 12, 2026 at 4:19 AM
MCP server version statistics
A daily view of how many safely measurable MCP servers have crossed the breaking protocol boundary introduced by version 2026-07-28.
Modern protocol
4
Legacy protocol
74
Not yet observed
0
Measurement coverage
100%
Changed today
1
Standards view
Are servers ready for the July 2026 protocol break?
Adoption is measured through anonymous remote negotiation and audited vendor-owned local packages. Auth-gated targets are excluded instead of being counted as unknown.
Breaking-change readiness
Modern protocol adoption
The July 2026 release replaced the initialization handshake with the stateless protocol.
4
of 78 safe protocol targets
verified on the modern wire protocol
verified on the modern wire protocol
Modern
45.1%
2026-07-28 or newer
Legacy
7494.9%
Before 2026-07-28
Unknown
00.0%
Not yet observed
Among the 78 servers with a verified version, modern adoption is 5.1%.
Exact observed versions
2025-11-25legacy · 58
2024-11-05legacy · 8
2025-03-26legacy · 5
2026-07-28modern · 4
2025-06-18legacy · 3
Migration progress over time
Share of safely probeable servers, grouped by the July 2026 breaking-change boundary
Dashed markers indicate a change in the safely measurable server population.
Operational view
How the ecosystem behaves
Status trends show reachability, deployment mix shows where servers run, and probe duration makes the long tail visible.
Deployment shape
Where visible catalog records are designed to run
30%remote
127 of 421 visible catalog records are remote.
Response-time distribution
Completed probe duration, split by deployment type; retries are included
283ms median6.7s p90
Based on 240 of 421 targets with a recorded duration. Latency measures the collector’s full probe, not server processing time alone.
3 safe probe targets still failed after retries today. Last-known values remain in protocol percentages where available; 0 eligible targets have never produced a usable protocol value.
Latest server observations
Safe protocol targets are shown first. Click a server to inspect its protocol history.
57 safe protocol targets
30 anonymous remote targets
27 trusted local targets
126 release-metadata records
238 catalog-only records
“Release metadata” means a package or repository version is public, but there is no audited anonymous endpoint or audited launch command for wire-protocol negotiation. Local commands are explicit vendor-owned allowlist entries; they are never inferred from README text. “Catalog only” means the listing exposes neither. Both are excluded from adoption percentages.
| Catalog | |||||||
|---|---|---|---|---|---|---|---|
mcpservers.org | local | protocol errorlast known | 2025-11-25 | 1.29.1 | last known | 30998 ms | |
mcpservers.org | remote | ok | 2026-07-28 | 0.4.13 | discover | 985 ms | |
mcpservers.org | remote | ok | 2025-03-26 | 1.0.0 | initialize | 993 ms | |
mcpservers.org | remote | ok | 2024-11-05 | 1.0.0 | initialize | 2503 ms | |
mcpservers.org | remote | ok | 2025-11-25 | 1.0.0 | initialize | 1313 ms | |
mcpservers.org | remote | ok | 2025-11-25 | 1.28.1 | initialize | 3790 ms | |
mcpservers.org | remote | ok | 2025-11-25 | 0.5.1 | initialize | 1287 ms | |
mcpservers.org | remote | ok | 2026-07-28 | 1.0.0 | discover | 846 ms | |
mcpservers.org | remote | ok | 2025-11-25 | 2.6.0 | initialize | 4550 ms | |
mcpservers.org | remote | ok | 2025-11-25 | 2.14.3 | initialize | 1580 ms |
57 servers · Page 1 of 6
Measurement note. Runtime versions come from anonymous remote MCP negotiation or an explicit allowlist of vendor-owned local packages. Local processes run without collector credentials and no server tools are called. Other local versions come from official package or release metadata. Authentication-gated targets are excluded because their protocol version cannot be verified safely. Failed probes remain visible, and their last successful value is retained when available. The population is limited to mcpservers.org's current Official catalog.