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
820pages tracked
773 changed this week · last read 23 Oct 2026
Claude Code CLI
228pages tracked
147 changed this week · last read 23 Oct 2026
Claude Documentation
280pages tracked
77 changed this week · last read 23 Oct 2026
Model Context Protocol
357pages tracked
171 changed this week · last read 23 Oct 2026
100 on this page
ReadSourcePageWhatLines
20 Oct 2026
432 pages
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mcp
specification/2025-11-25/client/sampling
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mcpchanged
specification/2025-11-25/client/sampling
<div id="enable-section-numbers" />
<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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specification/2025-11-25/client/roots
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<div id="enable-section-numbers" />
<Warning>
For trust & safety and security:
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specification/2025-11-25/basic/utilities/tasks
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mcpchanged
specification/2025-11-25/basic/utilities/tasks
<div id="enable-section-numbers" />
<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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specification/2025-11-25/basic/transports
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<div id="enable-section-numbers" />
<Info>
This replaces the [HTTP+SSE
transport](/specification/2024-11-05/basic/transports#http-with-sse) from
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specification/2025-11-25/basic/lifecycle
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specification/2025-11-25/basic/lifecycle
<div id="enable-section-numbers" />
<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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mcp
specification/2025-06-18/server/tools
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mcpchanged
specification/2025-06-18/server/tools
<div id="enable-section-numbers" />
<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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mcp
specification/2025-06-18/server/resources
±changed
+1−3
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specification/2025-06-18/server/resources
<div id="enable-section-numbers" />
<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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mcp
specification/2025-06-18/server/prompts
±changed
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mcpchanged
specification/2025-06-18/server/prompts
<div id="enable-section-numbers" />
<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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mcp
specification/2025-06-18/client/sampling
±changed
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mcpchanged
specification/2025-06-18/client/sampling
<div id="enable-section-numbers" />
<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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mcp
specification/2025-06-18/client/roots
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<div id="enable-section-numbers" />
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mcp
specification/2025-06-18/client/elicitation
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mcpchanged
specification/2025-06-18/client/elicitation
<div id="enable-section-numbers" />
<Note>
Elicitation is newly introduced in this version of the MCP specification and its design may evolve in future protocol versions.
</Note>
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mcp
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specification/2025-06-18/basic/utilities/progress
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<div id="enable-section-numbers" />
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specification/2025-06-18/basic/utilities/cancellation
<div id="enable-section-numbers" />
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mcp
specification/2025-06-18/basic/transports
±changed
+6−8
mcpchanged
specification/2025-06-18/basic/transports
<div id="enable-section-numbers" />
<Info>
This replaces the [HTTP+SSE
transport](/specification/2024-11-05/basic/transports#http-with-sse) from
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mcp
specification/2025-06-18/basic/lifecycle
±changed
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mcpchanged
specification/2025-06-18/basic/lifecycle
<div id="enable-section-numbers" />
<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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mcp
specification/2025-06-18/basic/authorization
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<div id="enable-section-numbers" />
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mcp
specification/2025-03-26/server/tools
±changed
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specification/2025-03-26/server/tools
<Warning>
For trust & safety and security, there **SHOULD** always
be a human in the loop with the ability to deny tool invocations.
Applications **SHOULD**:
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mcp
specification/2025-03-26/server/resources
±changed
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mcpchanged
specification/2025-03-26/server/resources
<img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/specification/2025-03-26/server/resource-picker.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=7f6d9a491a97e714b5d5fc74cb0c713
![Example of resource context picker](https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/specification/2025-03-26/server/resource-picker.png?fit=max\&auto=format\&n=4ZXF1PrDkEaJvXpn\&q=85\&s
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mcp
specification/2025-03-26/server/prompts
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mcpchanged
specification/2025-03-26/server/prompts
<img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/specification/2025-03-26/server/slash-command.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=8390583e2400c914dd404e37e014613e"
 from
protocol version 2024-11-05. See the [backwards compatibility](#backwards-compatibility)
guide below.
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mcp
specification/2024-11-05/server/tools
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mcpchanged
specification/2024-11-05/server/tools
<Warning>
For trust & safety and security, there **SHOULD** always
be a human in the loop with the ability to deny tool invocations.
Applications **SHOULD**:
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mcp
specification/2024-11-05/server/resources
±changed
+1−1
mcpchanged
specification/2024-11-05/server/resources
<img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/specification/2024-11-05/server/resource-picker.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=c393fd9aa41eca521cb2f830d839612
![Example of resource context picker](https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/specification/2024-11-05/server/resource-picker.png?fit=max\&auto=format\&n=4ZXF1PrDkEaJvXpn\&q=85\&s
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mcp
specification/2024-11-05/server/prompts
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mcpchanged
specification/2024-11-05/server/prompts
<img src="https://mintcdn.com/mcp/4ZXF1PrDkEaJvXpn/specification/2024-11-05/server/slash-command.png?fit=max&auto=format&n=4ZXF1PrDkEaJvXpn&q=85&s=ae78d658be66d75446ffd37a36e944c9"
 as of protocol version
`2026-07-28` and scheduled for removal. New implementations should pass
directories or files via tool parameters, resource URIs, or server
configuration instead.
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mcp
docs/draft/learn/architecture
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docs/draft/learn/architecture
<Note>
MCP focuses solely on the protocol for context exchange—it does not dictate
how AI applications use LLMs or manage the provided context.
</Note>
> [!NOTE]
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docs/draft/getting-started/intro
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docs/draft/getting-started/intro
<Frame>
<img src="https://mintcdn.com/mcp/bEUxYpZqie0DsluH/images/mcp-simple-diagram.png?fit=max&auto=format&n=bEUxYpZqie0DsluH&q=85&s=35268aa0ad50b8c385913810e7604550" width="3840" heig
</Frame>
<CardGroup cols={2}>
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docs/2026-07-28/learn/versioning
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docs/2026-07-28/learn/versioning
<Info>
The protocol version will *not* be incremented when the
protocol is updated, as long as the changes maintain backwards compatibility. This allows
for incremental improvements while preserving interoperability.
</Info>
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mcp
docs/2026-07-28/learn/server-concepts
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docs/2026-07-28/learn/server-concepts
| **Tools** | Functions that your LLM can actively call, and decides when to use them based on user requests. Tools can write to databases, call external APIs, modify files, or tri
| **Resources** | Passive data sources that provide read-only access to information for context, such as file contents, database schemas, or API documentation. | Retrieve documents
| **Prompts** | Pre-built instruction templates that tell the model to work with specific tools and resources. | Plan a vacation<br />Summarize my meetings<br />Draft an email | Us
| **Tools** | Functions that your LLM can actively call, and decides when to use them based on user requests. Tools can write to databases, call external APIs, modify files, or tri
| **Resources** | Passive data sources that provide read-only access to information for context, such as file contents, database schemas, or API documentation. | Retrieve documents
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mcp
docs/2026-07-28/learn/client-concepts
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docs/2026-07-28/learn/client-concepts
<Warning>
Roots are [deprecated](/specification/2026-07-28/deprecated) as of protocol
version `2026-07-28` and scheduled for removal. New implementations should
pass directories or files via tool parameters, resource URIs, or server
configuration instead.
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mcp
docs/2026-07-28/learn/architecture
±changed
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mcpchanged
docs/2026-07-28/learn/architecture
<Note>
MCP focuses solely on the protocol for context exchange—it does not dictate
how AI applications use LLMs or manage the provided context.
</Note>
> [!NOTE]
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docs/2026-07-28/getting-started/intro
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<Frame>
<img src="https://mintcdn.com/mcp/bEUxYpZqie0DsluH/images/mcp-simple-diagram.png?fit=max&auto=format&n=bEUxYpZqie0DsluH&q=85&s=35268aa0ad50b8c385913810e7604550" width="3840" heig
</Frame>
<CardGroup cols={2}>
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docs/2025-11-25/learn/versioning
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mcpchanged
docs/2025-11-25/learn/versioning
<Info>
The protocol version will *not* be incremented when the
protocol is updated, as long as the changes maintain backwards compatibility. This allows
for incremental improvements while preserving interoperability.
</Info>
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mcp
docs/2025-11-25/learn/server-concepts
±changed
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docs/2025-11-25/learn/server-concepts
| **Tools** | Functions that your LLM can actively call, and decides when to use them based on user requests. Tools can write to databases, call external APIs, modify files, or tri
| **Resources** | Passive data sources that provide read-only access to information for context, such as file contents, database schemas, or API documentation. | Retrieve documents
| **Prompts** | Pre-built instruction templates that tell the model to work with specific tools and resources. | Plan a vacation<br />Summarize my meetings<br />Draft an email | Us
| **Tools** | Functions that your LLM can actively call, and decides when to use them based on user requests. Tools can write to databases, call external APIs, modify files, or tri
| **Resources** | Passive data sources that provide read-only access to information for context, such as file contents, database schemas, or API documentation. | Retrieve documents
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mcp
docs/2025-11-25/learn/architecture
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mcpchanged
docs/2025-11-25/learn/architecture
<Note>
MCP focuses solely on the protocol for context exchange—it does not dictate
how AI applications use LLMs or manage the provided context.
</Note>
> [!NOTE]
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docs/2025-11-25/getting-started/intro
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<Frame>
<img src="https://mintcdn.com/mcp/bEUxYpZqie0DsluH/images/mcp-simple-diagram.png?fit=max&auto=format&n=bEUxYpZqie0DsluH&q=85&s=35268aa0ad50b8c385913810e7604550" width="3840" heig
</Frame>
<CardGroup cols={2}>
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docs/2025-06-18/learn/versioning
±changed
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mcpchanged
docs/2025-06-18/learn/versioning
<Info>
The protocol version will *not* be incremented when the
protocol is updated, as long as the changes maintain backwards compatibility. This allows
for incremental improvements while preserving interoperability.
</Info>
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mcp
docs/2025-06-18/learn/server-concepts
±changed
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docs/2025-06-18/learn/server-concepts
| **Tools** | Functions that your LLM can actively call, and decides when to use them based on user requests. Tools can write to databases, call external APIs, modify files, or tri
| **Resources** | Passive data sources that provide read-only access to information for context, such as file contents, database schemas, or API documentation. | Retrieve documents
| **Prompts** | Pre-built instruction templates that tell the model to work with specific tools and resources. | Plan a vacation<br />Summarize my meetings<br />Draft an email | Us
| **Tools** | Functions that your LLM can actively call, and decides when to use them based on user requests. Tools can write to databases, call external APIs, modify files, or tri
| **Resources** | Passive data sources that provide read-only access to information for context, such as file contents, database schemas, or API documentation. | Retrieve documents
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mcp
docs/2025-06-18/learn/architecture
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mcpchanged
docs/2025-06-18/learn/architecture
<Note>
MCP focuses solely on the protocol for context exchange—it does not dictate
how AI applications use LLMs or manage the provided context.
</Note>
> [!NOTE]
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mcp
docs/2025-06-18/getting-started/intro
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docs/2025-06-18/getting-started/intro
<Frame>
<img src="https://mintcdn.com/mcp/bEUxYpZqie0DsluH/images/mcp-simple-diagram.png?fit=max&auto=format&n=bEUxYpZqie0DsluH&q=85&s=35268aa0ad50b8c385913810e7604550" width="3840" heig
</Frame>
<CardGroup cols={2}>
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mcp
docs/2025-03-26/learn/versioning
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mcpchanged
docs/2025-03-26/learn/versioning
<Info>
The protocol version will *not* be incremented when the
protocol is updated, as long as the changes maintain backwards compatibility. This allows
for incremental improvements while preserving interoperability.
</Info>
+5 −5 lines
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mcp
docs/2025-03-26/learn/server-concepts
±changed
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mcpchanged
docs/2025-03-26/learn/server-concepts
| **Tools** | Functions that your LLM can actively call, and decides when to use them based on user requests. Tools can write to databases, call external APIs, modify files, or tri
| **Resources** | Passive data sources that provide read-only access to information for context, such as file contents, database schemas, or API documentation. | Retrieve documents
| **Prompts** | Pre-built instruction templates that tell the model to work with specific tools and resources. | Plan a vacation<br />Summarize my meetings<br />Draft an email | Us
| **Tools** | Functions that your LLM can actively call, and decides when to use them based on user requests. Tools can write to databases, call external APIs, modify files, or tri
| **Resources** | Passive data sources that provide read-only access to information for context, such as file contents, database schemas, or API documentation. | Retrieve documents
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mcp
docs/2025-03-26/learn/architecture
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mcpchanged
docs/2025-03-26/learn/architecture
<Note>
MCP focuses solely on the protocol for context exchange—it does not dictate
how AI applications use LLMs or manage the provided context.
</Note>
> [!NOTE]
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docs/2025-03-26/getting-started/intro
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docs/2025-03-26/getting-started/intro
<Frame>
<img src="https://mintcdn.com/mcp/bEUxYpZqie0DsluH/images/mcp-simple-diagram.png?fit=max&auto=format&n=bEUxYpZqie0DsluH&q=85&s=35268aa0ad50b8c385913810e7604550" width="3840" heig
</Frame>
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<Info>
The protocol version will *not* be incremented when the
protocol is updated, as long as the changes maintain backwards compatibility. This allows
for incremental improvements while preserving interoperability.
</Info>
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| **Tools** | Functions that your LLM can actively call, and decides when to use them based on user requests. Tools can write to databases, call external APIs, modify files, or tri
| **Resources** | Passive data sources that provide read-only access to information for context, such as file contents, database schemas, or API documentation. | Retrieve documents
| **Prompts** | Pre-built instruction templates that tell the model to work with specific tools and resources. | Plan a vacation<br />Summarize my meetings<br />Draft an email | Us
| **Tools** | Functions that your LLM can actively call, and decides when to use them based on user requests. Tools can write to databases, call external APIs, modify files, or tri
| **Resources** | Passive data sources that provide read-only access to information for context, such as file contents, database schemas, or API documentation. | Retrieve documents
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<Note>
MCP focuses solely on the protocol for context exchange—it does not dictate
how AI applications use LLMs or manage the provided context.
</Note>
> [!NOTE]
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<Frame>
<img src="https://mintcdn.com/mcp/bEUxYpZqie0DsluH/images/mcp-simple-diagram.png?fit=max&auto=format&n=bEUxYpZqie0DsluH&q=85&s=35268aa0ad50b8c385913810e7604550" width="3840" heig
</Frame>
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<Info>Last updated: **2026-08-22**</Info>
> [!NOTE]
>
> Last updated: **2026-08-22**
<Note>
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community/working-groups/transports
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* **[Agents WG](/community/working-groups/agents)**: The Agents WG owns Tasks and
durable execution; the groups coordinate where these depend on multi-round-trip
requests, request association, stateless operation, or binding behavior.
* **[Triggers and Events WG](/community/working-groups/triggers-events)**: Event
callbacks, subscriptions, and application-level delivery semantics are owned by that
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registry schema changes), Agents WG (skill activation, server metadata consumption),
registry schema changes), Agents IG (skill activation, server metadata consumption),
* **Agents WG** — How agents consume server metadata, skill activation
* **Agents IG** — How agents consume server metadata, skill activation
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* **Agents WG.** Multi-agent and job orchestration systems are the motivating consumers of a shared write path.
* **Agents IG.** Multi-agent and job orchestration systems are the motivating consumers of a shared write path.
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* **[Agents WG](/community/working-groups/agents)**: Tasks are the foundation for the long-running
* **[Tasks and Events WG](/community/working-groups/tasks-events)**: Tasks are the foundation for the long-running
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* **Agents WG**: delegated/on-behalf-of access and consent for multi-agent chains overlap heavily with agentic use cases
* **Agents IG**: delegated/on-behalf-of access and consent for multi-agent chains overlap heavily with agentic use cases
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* (breaking) Changed SSH sessions on macOS and Linux hosts to not start when the host can't report the real location of one of the session's folders. The error says to start a new
* (breaking) Changed SSH sessions that start through your organization's corporate launcher: if the launcher reads standard input before it starts Claude Code, for example to ask f
* (breaking) Changed SSH sessions to stop starting the MCP servers from your desktop settings on a remote host whose administrator uses Claude Code's `managed-mcp.json` to allow on
* (breaking) Changed the Browser pane in SSH sessions to keep sign-ins separate for each session and only until you quit the app, to open localhost (your computer) and private-netw
* (breaking) Changed WSL sessions, and SSH sessions on macOS and Linux hosts, to stop using an added folder whose saved path is relative, starts with `//`, or starts or ends with a
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tools-reference
Read refuses an image file larger than 128 MB with an error that tells Claude to resize the image or export a smaller copy, then read that copy. If Claude stops at the error inst
Read refuses an image file larger than 128 MB with an error that tells Claude to resize the image or export a smaller copy, then read that copy. If Claude stops at the error instea
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ARG ANT_VERSION=1.42.0
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VERSION=1.42.0
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implementation("com.anthropic:anthropic-java:2.73.0")
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implementation("com.anthropic:anthropic-java:2.73.0")
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implementation("com.anthropic:anthropic-java:2.73.0")
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implementation("com.anthropic:anthropic-java:2.73.0")
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To gate a merge or post a summary from your own CI, parse the last line of the Details text with `gh` and jq. That line is a machine-readable comment.
To gate a merge or post a summary from your own CI, parse the last line of the Details text with `gh` and jq. That line is an HTML comment that holds the severity counts as JSON:
```text theme={null}
<!-- bughunter-severity: {"nit":1,"normal":2,"pre_existing":0} -->
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To remove a session from the list, press `Ctrl+X` to stop it and `Ctrl+X` again within two seconds to delete it. Pressing `Ctrl+X` on a group header deletes every session in that g
The second press deletes the session even when the stop attempt fails, for example because the [background service isn't responding](#agent-view-says-the-background-service-did-not
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Nothing on this page matches that. Press Enter to search every page of the ledger.