#model-context-protocol

A dark comparison-matrix style cover listing the MCP 2026-07-28 spec rewrite's changes: Mcp-Session-Id removed, initialize handshake replaced by _meta fields, server/discover now required, and SSE subscriptions replaced

The MCP 2026-07-28 Spec Rewrite: Full Guide

The MCP 2026-07-28 spec rewrites the protocol core: sessions gone, a new required RPC, subscriptions replaced. Full rundown of every breaking change.

Aug 6, 2026Read more →

A terminal window showing the verbatim MCP 2026-07-28 changelog entry: OAuth 2.0 Dynamic Client Registration Protocol deprecated in favor of Client ID Metadata Documents

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MCP Deprecates OAuth Dynamic Client Registration

The 2026-07-28 MCP spec deprecates OAuth DCR for Client ID Metadata Documents. A stable HTTPS URL becomes the client_id instead of a minted registration.

Aug 6, 2026Read more →

A terminal window showing the verbatim MCP 2026-07-28 changelog entry: Roots, Sampling, and Logging features deprecated, suggested migrations provided

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MCP Deprecates Roots, Sampling, and Logging

The 2026-07-28 MCP spec deprecates Roots, Sampling, and Logging with a 12-month runway. Each has a real migration path: config, MRTR, and stderr/OTel.

Aug 6, 2026Read more →

A terminal window showing the verbatim MCP 2026-07-28 changelog entry: moved experimental tasks to official extension io.modelcontextprotocol/tasks, replaced blocking tasks/result with polling

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MCP Moves Tasks Out of Core Into an Extension

The 2026-07-28 MCP spec moves Tasks into io.modelcontextprotocol/tasks and replaces blocking tasks/result with polling via tasks/get and tasks/update.

Aug 6, 2026Read more →

A terminal window showing the verbatim MCP 2026-07-28 changelog entry: removed protocols ping, logging/setLevel, notifications/roots/list_changed

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MCP Removes the ping and logging/setLevel Methods

The 2026-07-28 MCP spec removes ping and logging/setLevel. Log level now sets per-request via _meta, and there is no stated ping replacement.

Aug 6, 2026Read more →

A terminal window showing the verbatim MCP 2026-07-28 changelog entry: eliminated Mcp-Session-Id header from Streamable HTTP transport, servers use explicit handles for cross-call state

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MCP Removes Protocol-Level Sessions (Mcp-Session-Id)

The 2026-07-28 MCP spec eliminates the Mcp-Session-Id header. Cross-call state now needs explicit, server-minted handles passed as tool arguments.

Aug 6, 2026Read more →

A terminal window showing the verbatim MCP 2026-07-28 changelog entry: eliminated Last-Event-ID header and SSE event IDs, broken streams require re-issuing as new requests

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MCP Removes SSE Resumability (Last-Event-ID Gone)

The 2026-07-28 MCP spec eliminates Last-Event-ID and SSE event IDs. A broken stream now requires re-issuing the whole request, not resuming in place.

Aug 6, 2026Read more →

A terminal window showing a real MCP 2026-07-28 request with protocol version and client capabilities carried in the _meta field instead of an initialize handshake

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MCP Replaces initialize Handshake With _meta Fields

The 2026-07-28 MCP spec removes the initialize handshake. Every request now carries protocol version and capabilities in _meta fields instead.

Aug 6, 2026Read more →

A terminal window showing a real MCP notification sent over a subscriptions/listen stream: notifications/tools/list_changed

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MCP Replaces SSE Subscriptions With subscriptions/listen

The 2026-07-28 MCP spec replaces the SSE GET endpoint with an opt-in subscriptions/listen stream. Clients now request each notification type explicitly.

Aug 6, 2026Read more →

A real MCP InputRequiredResult example showing resultType input_required, an inputRequests confirmation elicitation, and an opaque requestState value

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MCP Requires resultType on Every Returned Result

The 2026-07-28 MCP spec makes resultType mandatory on every result. The old server-initiated request pattern is replaced by an input_required result.

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A terminal window showing the verbatim MCP 2026-07-28 changelog entry: servers must implement server/discover to advertise supported protocol versions, capabilities, and identity

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MCP Servers Must Now Implement server/discover

The 2026-07-28 MCP spec adds a required server/discover RPC. Existing servers need a handler for it before a compliant client can negotiate at all.

Aug 6, 2026Read more →