HomeDocs changes
Documentation changes
What the docs quietly changed.
Anthropic's published documentation, fetched on a schedule and diffed against the last copy. Every edit dated, including the ones that never made a release note.
Last poll read all 4 cleanly: Claude Code CLI, Claude Developer Platform, Claude Documentation, Model Context Protocol. A date here is when this site noticed, not when Anthropic edited.
Claude Developer Platform
808pages tracked
587 changed this week · last read 22 Oct 2026
Claude Code CLI
228pages tracked
146 changed this week · last read 22 Oct 2026
Claude Documentation
278pages tracked
74 changed this week · last read 22 Oct 2026
Model Context Protocol
357pages tracked
163 changed this week · last read 21 Oct 2026
100 on this page
786 of the ledger's changes in mcp. Show every change
ReadSourcePageWhatLines
20 Oct 2026
162 pages
+3897 −4226 lines
mcp
specification/draft/server/index
±changed
+3−5
mcpchanged
specification/draft/server/index
<CardGroup cols={3}>
<Card title="Prompts" icon="message" href="/specification/draft/server/prompts" />
> **[Prompts](/specification/draft/server/prompts)**
<Card title="Resources" icon="file-lines" href="/specification/draft/server/resources" />
> **[Resources](/specification/draft/server/resources)**
+3 −5 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/index
±changed
+5−9
mcpchanged
specification/draft/index
<div id="enable-section-numbers" />
<CardGroup cols={5}>
<Card title="Architecture" icon="sitemap" href="/specification/draft/architecture" />
> **[Architecture](/specification/draft/architecture)**
+5 −9 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/basic/transports/index
±changed
+0−2
mcpchanged
specification/draft/basic/transports/index
<div id="enable-section-numbers" />
+0 −2 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/basic/patterns/index
±changed
+0−2
mcpchanged
specification/draft/basic/patterns/index
<div id="enable-section-numbers" />
+0 −2 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/basic/index
±changed
+17−19
mcpchanged
specification/draft/basic/index
<div id="enable-section-numbers" />
<Note>
This implies that an open connection, such as a STDIO process, is not a
conversation or session: clients may interleave unrelated requests on the same
+17 −19 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/basic/authorization/index
±changed
+0−2
mcpchanged
specification/draft/basic/authorization/index
<div id="enable-section-numbers" />
+0 −2 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/architecture/index
±changed
+0−2
mcpchanged
specification/draft/architecture/index
<div id="enable-section-numbers" />
+0 −2 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2026-07-28/server/index
±changed
+3−5
mcpchanged
specification/2026-07-28/server/index
<CardGroup cols={3}>
<Card title="Prompts" icon="message" href="/specification/2026-07-28/server/prompts" />
> **[Prompts](/specification/2026-07-28/server/prompts)**
<Card title="Resources" icon="file-lines" href="/specification/2026-07-28/server/resources" />
> **[Resources](/specification/2026-07-28/server/resources)**
+3 −5 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2026-07-28/index
±changed
+5−9
mcpchanged
specification/2026-07-28/index
<div id="enable-section-numbers" />
<CardGroup cols={5}>
<Card title="Architecture" icon="sitemap" href="/specification/2026-07-28/architecture" />
> **[Architecture](/specification/2026-07-28/architecture)**
+5 −9 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2026-07-28/basic/transports/index
±changed
+0−2
mcpchanged
specification/2026-07-28/basic/transports/index
<div id="enable-section-numbers" />
+0 −2 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2026-07-28/basic/patterns/index
±changed
+0−2
mcpchanged
specification/2026-07-28/basic/patterns/index
<div id="enable-section-numbers" />
+0 −2 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2026-07-28/basic/index
±changed
+17−19
mcpchanged
specification/2026-07-28/basic/index
<div id="enable-section-numbers" />
<Note>
This implies that an open connection, such as a STDIO process, is not a
conversation or session: clients may interleave unrelated requests on the same
+17 −19 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2026-07-28/basic/authorization/index
±changed
+0−2
mcpchanged
specification/2026-07-28/basic/authorization/index
<div id="enable-section-numbers" />
+0 −2 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2026-07-28/architecture/index
±changed
+0−2
mcpchanged
specification/2026-07-28/architecture/index
<div id="enable-section-numbers" />
+0 −2 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2025-11-25/server/index
±changed
+3−5
mcpchanged
specification/2025-11-25/server/index
<CardGroup cols={3}>
<Card title="Prompts" icon="message" href="/specification/2025-11-25/server/prompts" />
> **[Prompts](/specification/2025-11-25/server/prompts)**
<Card title="Resources" icon="file-lines" href="/specification/2025-11-25/server/resources" />
> **[Resources](/specification/2025-11-25/server/resources)**
+3 −5 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2025-11-25/index
±changed
+5−9
mcpchanged
specification/2025-11-25/index
<div id="enable-section-numbers" />
<CardGroup cols={5}>
<Card title="Architecture" icon="sitemap" href="/specification/2025-11-25/architecture" />
> **[Architecture](/specification/2025-11-25/architecture)**
+5 −9 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2025-11-25/basic/index
±changed
+0−2
mcpchanged
specification/2025-11-25/basic/index
<div id="enable-section-numbers" />
+0 −2 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2025-11-25/architecture/index
±changed
+0−2
mcpchanged
specification/2025-11-25/architecture/index
<div id="enable-section-numbers" />
+0 −2 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2025-06-18/server/index
±changed
+3−5
mcpchanged
specification/2025-06-18/server/index
<CardGroup cols={3}>
<Card title="Prompts" icon="message" href="/specification/2025-06-18/server/prompts" />
> **[Prompts](/specification/2025-06-18/server/prompts)**
<Card title="Resources" icon="file-lines" href="/specification/2025-06-18/server/resources" />
> **[Resources](/specification/2025-06-18/server/resources)**
+3 −5 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2025-06-18/index
±changed
+5−9
mcpchanged
specification/2025-06-18/index
<div id="enable-section-numbers" />
<CardGroup cols={5}>
<Card title="Architecture" icon="sitemap" href="/specification/2025-06-18/architecture" />
> **[Architecture](/specification/2025-06-18/architecture)**
+5 −9 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2025-06-18/basic/index
±changed
+0−2
mcpchanged
specification/2025-06-18/basic/index
<div id="enable-section-numbers" />
+0 −2 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2025-06-18/architecture/index
±changed
+0−2
mcpchanged
specification/2025-06-18/architecture/index
<div id="enable-section-numbers" />
+0 −2 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2025-03-26/server/index
±changed
+3−5
mcpchanged
specification/2025-03-26/server/index
<CardGroup cols={3}>
<Card title="Prompts" icon="message" href="/specification/2025-03-26/server/prompts" />
> **[Prompts](/specification/2025-03-26/server/prompts)**
<Card title="Resources" icon="file-lines" href="/specification/2025-03-26/server/resources" />
> **[Resources](/specification/2025-03-26/server/resources)**
+3 −5 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2025-03-26/index
±changed
+5−7
mcpchanged
specification/2025-03-26/index
<CardGroup cols={5}>
<Card title="Architecture" icon="sitemap" href="/specification/2025-03-26/architecture" />
> **[Architecture](/specification/2025-03-26/architecture)**
<Card title="Base Protocol" icon="code" href="/specification/2025-03-26/basic" />
> **[Base Protocol](/specification/2025-03-26/basic)**
+5 −7 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2024-11-05/server/index
±changed
+3−5
mcpchanged
specification/2024-11-05/server/index
<CardGroup cols={3}>
<Card title="Prompts" icon="message" href="/specification/2024-11-05/server/prompts" />
> **[Prompts](/specification/2024-11-05/server/prompts)**
<Card title="Resources" icon="file-lines" href="/specification/2024-11-05/server/resources" />
> **[Resources](/specification/2024-11-05/server/resources)**
+3 −5 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2024-11-05/index
±changed
+5−7
mcpchanged
specification/2024-11-05/index
<CardGroup cols={5}>
<Card title="Architecture" icon="sitemap" href="/specification/2024-11-05/architecture" />
> **[Architecture](/specification/2024-11-05/architecture)**
<Card title="Base Protocol" icon="code" href="/specification/2024-11-05/basic" />
> **[Base Protocol](/specification/2024-11-05/basic)**
+5 −7 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2024-11-05/basic/index
±changed
+6−8
mcpchanged
specification/2024-11-05/basic/index
<CardGroup cols={3}>
<Card title="Lifecycle" icon="arrows-rotate" href="/specification/2024-11-05/basic/lifecycle" />
> **[Lifecycle](/specification/2024-11-05/basic/lifecycle)**
<Card title="Resources" icon="file-lines" href="/specification/2024-11-05/server/resources" />
> **[Resources](/specification/2024-11-05/server/resources)**
+6 −8 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
seps/index
±changed
+54−54
mcpchanged
seps/index
<Card title="Submit a SEP" icon="file-plus" href="/community/sep-guidelines">
Learn how to submit your own Specification Enhancement Proposal
</Card>
> **[Submit a SEP](/community/sep-guidelines)**
>
+54 −54 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
community/working-groups/triggers-events
−removed
+0−82
mcpremoved
community/working-groups/triggers-events
No line of the body moved in this read.
+0 −82 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
community/working-groups/agents
−removed
+0−143
mcpremoved
community/working-groups/agents
No line of the body moved in this read.
+0 −143 lines
Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/server/utilities/pagination
±changed
+8−10
mcpchanged
specification/draft/server/utilities/pagination
<div id="enable-section-numbers" />
<Note>
For brevity, the request examples on this page omit the `_meta` request
metadata (`io.modelcontextprotocol/protocolVersion`,
+8 −10 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/server/utilities/logging
±changed
+12−14
mcpchanged
specification/draft/server/utilities/logging
<div id="enable-section-numbers" />
<Warning>
**Deprecated**: The Logging feature is deprecated as of protocol version
`2026-07-28`
+12 −14 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/server/utilities/completion
±changed
+8−10
mcpchanged
specification/draft/server/utilities/completion
<div id="enable-section-numbers" />
<Note>
For brevity, the request examples on this page omit the `_meta` request
metadata (`io.modelcontextprotocol/protocolVersion`,
+8 −10 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/server/utilities/caching
±changed
+8−10
mcpchanged
specification/draft/server/utilities/caching
<div id="enable-section-numbers" />
* The <b>Time-to-live (TTL) Field</b>,`ttlMs`, is an integer value in milliseconds specifying how long the client MAY consider the result fresh.
* The <b>Cache Scope Field</b>,`cacheScope`, indicates the intended scope of the cached response, either `"public"` or `"private"`.
* The **Time-to-live (TTL) Field**,`ttlMs`, is an integer value in milliseconds specifying how long the client MAY consider the result fresh.
+8 −10 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/server/tools
±changed
+56−58
mcpchanged
specification/draft/server/tools
<div id="enable-section-numbers" />
<Note>
For brevity, the request examples on this page omit the `_meta` request
metadata (`io.modelcontextprotocol/protocolVersion`,
+56 −58 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/server/resources
±changed
+9−11
mcpchanged
specification/draft/server/resources
<div id="enable-section-numbers" />
<Note>
For brevity, the request examples on this page omit the `_meta` request
metadata (`io.modelcontextprotocol/protocolVersion`,
+9 −11 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/server/prompts
±changed
+14−16
mcpchanged
specification/draft/server/prompts
<div id="enable-section-numbers" />
<Note>
For brevity, the request examples on this page omit the `_meta` request
metadata (`io.modelcontextprotocol/protocolVersion`,
+14 −16 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/server/discover
±changed
+6−8
mcpchanged
specification/draft/server/discover
<div id="enable-section-numbers" />
<Note>
`serverInfo` is self-reported by the server and is not verified by the
protocol. It is intended for display, logging, and debugging. Clients **SHOULD
+6 −8 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/deprecated
±changed
+0−2
mcpchanged
specification/draft/deprecated
<div id="enable-section-numbers" />
+0 −2 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/client/sampling
±changed
+32−34
mcpchanged
specification/draft/client/sampling
<div id="enable-section-numbers" />
<Warning>
**Deprecated**: The Sampling feature is deprecated as of protocol version
`2026-07-28`
+32 −34 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/client/roots
±changed
+11−13
mcpchanged
specification/draft/client/roots
<div id="enable-section-numbers" />
<Warning>
**Deprecated**: The Roots feature is deprecated as of protocol version
`2026-07-28`
+11 −13 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/client/elicitation
±changed
+43−45
mcpchanged
specification/draft/client/elicitation
<div id="enable-section-numbers" />
<Warning>
For trust & safety and security:
+43 −45 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/basic/versioning
±changed
+0−2
mcpchanged
specification/draft/basic/versioning
<div id="enable-section-numbers" />
+0 −2 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/basic/transports/streamable-http
±changed
+66−68
mcpchanged
specification/draft/basic/transports/streamable-http
<div id="enable-section-numbers" />
<Info>
Streamable HTTP was introduced in protocol version 2025-03-26 as a replacement
for the [HTTP+SSE transport][http-sse] from protocol version 2024-11-05.
+66 −68 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/basic/transports/stdio
±changed
+0−2
mcpchanged
specification/draft/basic/transports/stdio
<div id="enable-section-numbers" />
+0 −2 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/basic/patterns/subscriptions
±changed
+0−2
mcpchanged
specification/draft/basic/patterns/subscriptions
<div id="enable-section-numbers" />
+0 −2 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/basic/patterns/progress
±changed
+0−2
mcpchanged
specification/draft/basic/patterns/progress
<div id="enable-section-numbers" />
+0 −2 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/basic/patterns/mrtr
±changed
+23−25
mcpchanged
specification/draft/basic/patterns/mrtr
<div id="enable-section-numbers" />
<Note>
Multi Round-Trip Requests (MRTR) was introduced in this version of the MCP
specification. This replaces the previous approach of sending server-initiated
+23 −25 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/basic/patterns/cancellation
±changed
+0−2
mcpchanged
specification/draft/basic/patterns/cancellation
<div id="enable-section-numbers" />
+0 −2 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/basic/authorization/security-considerations
±changed
+0−2
mcpchanged
specification/draft/basic/authorization/security-considerations
<div id="enable-section-numbers" />
+0 −2 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/basic/authorization/client-registration
±changed
+6−8
mcpchanged
specification/draft/basic/authorization/client-registration
<div id="enable-section-numbers" />
<Warning>
Dynamic Client Registration is deprecated. New implementations should use
[Client ID Metadata Documents](#client-id-metadata-documents) instead. This
+6 −8 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/draft/basic/authorization/authorization-server-discovery
±changed
+0−2
mcpchanged
specification/draft/basic/authorization/authorization-server-discovery
<div id="enable-section-numbers" />
+0 −2 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2026-07-28/server/utilities/pagination
±changed
+8−10
mcpchanged
specification/2026-07-28/server/utilities/pagination
<div id="enable-section-numbers" />
<Note>
For brevity, the request examples on this page omit the `_meta` request
metadata (`io.modelcontextprotocol/protocolVersion`,
+8 −10 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2026-07-28/server/utilities/logging
±changed
+12−14
mcpchanged
specification/2026-07-28/server/utilities/logging
<div id="enable-section-numbers" />
<Warning>
**Deprecated**: The Logging feature is deprecated as of protocol version
`2026-07-28`
+12 −14 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2026-07-28/server/utilities/completion
±changed
+8−10
mcpchanged
specification/2026-07-28/server/utilities/completion
<div id="enable-section-numbers" />
<Note>
For brevity, the request examples on this page omit the `_meta` request
metadata (`io.modelcontextprotocol/protocolVersion`,
+8 −10 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2026-07-28/server/utilities/caching
±changed
+8−10
mcpchanged
specification/2026-07-28/server/utilities/caching
<div id="enable-section-numbers" />
* The <b>Time-to-live (TTL) Field</b>,`ttlMs`, is an integer value in milliseconds specifying how long the client MAY consider the result fresh.
* The <b>Cache Scope Field</b>,`cacheScope`, indicates the intended scope of the cached response, either `"public"` or `"private"`.
* The **Time-to-live (TTL) Field**,`ttlMs`, is an integer value in milliseconds specifying how long the client MAY consider the result fresh.
+8 −10 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2026-07-28/server/tools
±changed
+56−58
mcpchanged
specification/2026-07-28/server/tools
<div id="enable-section-numbers" />
<Note>
For brevity, the request examples on this page omit the `_meta` request
metadata (`io.modelcontextprotocol/protocolVersion`,
+56 −58 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2026-07-28/server/resources
±changed
+9−11
mcpchanged
specification/2026-07-28/server/resources
<div id="enable-section-numbers" />
<Note>
For brevity, the request examples on this page omit the `_meta` request
metadata (`io.modelcontextprotocol/protocolVersion`,
+9 −11 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2026-07-28/server/prompts
±changed
+14−16
mcpchanged
specification/2026-07-28/server/prompts
<div id="enable-section-numbers" />
<Note>
For brevity, the request examples on this page omit the `_meta` request
metadata (`io.modelcontextprotocol/protocolVersion`,
+14 −16 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2026-07-28/server/discover
±changed
+6−8
mcpchanged
specification/2026-07-28/server/discover
<div id="enable-section-numbers" />
<Note>
`serverInfo` is self-reported by the server and is not verified by the
protocol. It is intended for display, logging, and debugging. Clients **SHOULD
+6 −8 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2026-07-28/deprecated
±changed
+0−2
mcpchanged
specification/2026-07-28/deprecated
<div id="enable-section-numbers" />
+0 −2 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2026-07-28/client/sampling
±changed
+32−34
mcpchanged
specification/2026-07-28/client/sampling
<div id="enable-section-numbers" />
<Warning>
**Deprecated**: The Sampling feature is deprecated as of protocol version
`2026-07-28`
+32 −34 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2026-07-28/client/roots
±changed
+11−13
mcpchanged
specification/2026-07-28/client/roots
<div id="enable-section-numbers" />
<Warning>
**Deprecated**: The Roots feature is deprecated as of protocol version
`2026-07-28`
+11 −13 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2026-07-28/client/elicitation
±changed
+43−45
mcpchanged
specification/2026-07-28/client/elicitation
<div id="enable-section-numbers" />
<Warning>
For trust & safety and security:
+43 −45 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2026-07-28/changelog
±changed
+0−2
mcpchanged
specification/2026-07-28/changelog
<div id="enable-section-numbers" />
+0 −2 lines
Upstream edited 20 Oct 2026 20:02 UTC Recorded here 20 Oct 2026 20:07 UTC
mcp
specification/2026-07-28/basic/versioning
±changed
+0−2
mcpchanged
specification/2026-07-28/basic/versioning
<div id="enable-section-numbers" />
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<Info>
Streamable HTTP was introduced in protocol version 2025-03-26 as a replacement
for the [HTTP+SSE transport][http-sse] from protocol version 2024-11-05.
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<Note>
Multi Round-Trip Requests (MRTR) was introduced in this version of the MCP
specification. This replaces the previous approach of sending server-initiated
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<Warning>
Dynamic Client Registration is deprecated. New implementations should use
[Client ID Metadata Documents](#client-id-metadata-documents) instead. This
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<Warning>
For trust & safety and security, there **SHOULD** always
be a human in the loop with the ability to deny tool invocations.
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<img src="https://mintcdn.com/mcp/uzELntid9uQ-QMAr/specification/2025-11-25/server/resource-picker.png?fit=max&auto=format&n=uzELntid9uQ-QMAr&q=85&s=bc7bc3db17d447a69809689e5888a3a
![Example of resource context picker](https://mintcdn.com/mcp/uzELntid9uQ-QMAr/specification/2025-11-25/server/resource-picker.png?fit=max\&auto=format\&n=uzELntid9uQ-QMAr\&q=85\&s
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<img src="https://mintcdn.com/mcp/uzELntid9uQ-QMAr/specification/2025-11-25/server/slash-command.png?fit=max&auto=format&n=uzELntid9uQ-QMAr&q=85&s=965e4fa2273b376721d6f26c396c69c5"
![Example of prompt exposed as slash command](https://mintcdn.com/mcp/uzELntid9uQ-QMAr/specification/2025-11-25/server/slash-command.png?fit=max\&auto=format\&n=uzELntid9uQ-QMAr\&q
<Note>
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<Warning>
For trust & safety and security, there **SHOULD** always
be a human in the loop with the ability to deny sampling requests.
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<Warning>
For trust & safety and security:
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<Note>
Tasks were introduced in version 2025-11-25 of the MCP specification and are currently considered **experimental**.
The design and behavior of tasks may evolve in future protocol versions.
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<Info>
This replaces the [HTTP+SSE
transport](/specification/2024-11-05/basic/transports#http-with-sse) from
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<Note>
If using HTTP, the client **MUST** include the `MCP-Protocol-Version: <protocol-version>` HTTP header on all subsequent requests to the MCP
server.
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<Warning>
For trust & safety and security, there **SHOULD** always
be a human in the loop with the ability to deny tool invocations.
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<img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/specification/2025-06-18/server/resource-picker.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=133fa885ef6e9c2e20049da5c33f438
![Example of resource context picker](https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/specification/2025-06-18/server/resource-picker.png?fit=max\&auto=format\&n=4ZXF1PrDkEaJvXpn\&q=85\&s
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<img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/specification/2025-06-18/server/slash-command.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=7f003e36d881dd6f3e5b8cbdd85e5ca5"
![Example of prompt exposed as slash command](https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/specification/2025-06-18/server/slash-command.png?fit=max\&auto=format\&n=4ZXF1PrDkEaJvXpn\&q
<Note>
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<Warning>
For trust & safety and security, there **SHOULD** always
be a human in the loop with the ability to deny sampling requests.
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