MCP 2025-06-18
SUPERSEDED Confidence: High (1.00)MCP 2025-06-18 is a superseded revision of the Model Context Protocol specification, released 2025-06-18. 8 of 8 verified entities support it.
What is MCP specification revision 2025-06-18?
MCP 2025-06-18 is a superseded revision of the Model Context Protocol specification, released 2025-06-18.
Which servers and clients support MCP 2025-06-18?
8 entities have a verified support record against 2025-06-18: 8 supported, 0 partial, 0 not supported. Each record links its evidence URL and check date.
Removed JSON-RPC batching, added structured tool output and elicitation, classified MCP servers as OAuth resource servers, and required RFC 8707 resource indicators plus the MCP-Protocol-Version header on HTTP.
What changed in MCP 2025-06-18?
- Removed JSON-RPC batching support
- Structured tool output
- MCP servers classified as OAuth resource servers with protected resource metadata
- Clients required to implement RFC 8707 resource indicators against malicious-server token capture
- Elicitation - servers can request additional information from users
- Resource links in tool call results
- MCP-Protocol-Version header required on subsequent HTTP requests
MCP 2025-06-18 hardened the authorization story (resource-server classification, RFC 8707 resource indicators) and introduced elicitation, structured tool output, and resource links. It also removed the JSON-RPC batching added in the previous revision and made the MCP-Protocol-Version HTTP header mandatory after negotiation.
Which servers and clients are verified against MCP 2025-06-18?
| Entity | Type | Status | Last checked | Evidence |
|---|---|---|---|---|
| Ash AI MCP Server | server | Supported | Source | |
| brightdata-mcp | server | Supported | Source | |
| france-data-mcp | server | Supported | Source | |
| homebutler | server | Supported | Source | |
| memory | server | Supported | Source | |
| GitLab MCP Server | server | Supported | Source | |
| Power BI Modeling MCP Server | server | Supported | Source | |
| Run402 | server | Supported | Source |
How was this verified, and what are the sources?
Verified · method: spec-changelog
· confidence 1.00 (High).