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Sweep 06 Nov 2026 · 01:32Z Build v2.1.319 537 read Stable v2.1.311 Latest v2.1.319 Next v2.1.319 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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What has changed since

An entry is only as true as the day it was written.

Flags move on the server after a release ships. Anthropic's own notes land days later and their documentation later still. Sometimes an entry turns out to be wrong and gets corrected by hand. All of that is recorded against the entry it happened to, and this is the whole of it in the order it happened.

Nothing here replaces an entry. Every line links to the page its release published, still saying what that release said, because a correction is added and dated rather than swapped in.

Events22,665dated, and never edited afterwards
Newestthe last time anything moved
Flag readings moved17,292a reading is one sample, for one account
Documentation arrived5,263a docs edit touched an entry's names
WhenEntryWhat happened
v2.1.300--worktree Documentation arrivedAnthropic's documentation has since written up --worktree, on Desktop application.
the line in the docs

| Session isolation | [`--worktree`](/docs/en/cli-reference) flag | [Run a session in its own worktree](#run-a-session-in-its-own-worktree) |

v2.1.299--worktree Documentation arrivedAnthropic's documentation has since written up --worktree, on Desktop application.
the line in the docs

| Session isolation | [`--worktree`](/docs/en/cli-reference) flag | [Run a session in its own worktree](#run-a-session-in-its-own-worktree) |

v2.1.299--worktree Documentation arrivedAnthropic's documentation has since written up --worktree, on Desktop application.
the line in the docs

| Session isolation | [`--worktree`](/docs/en/cli-reference) flag | [Run a session in its own worktree](#run-a-session-in-its-own-worktree) |

v2.1.302/config Documentation arrivedAnthropic's documentation has since written up /config, on Desktop application.
the line in the docs

* **If the repository doesn't allow auto-merge**: **Merge when ready** doesn't turn on, so enable auto-merge in your [GitHub repository settings](https://docs.github.com/en/repositories/configuring-branches-and-merges-in-your-repository/co…

v2.1.299/sandbox Documentation arrivedA small documentation edit on Claude apps gateway configuration touched a line naming /sandbox after this was published.
the line in the docs

* The egress allowlist, from `sandbox.network.allowedDomains`. If you set `coworkEgressAllowedHosts` in the policy's `desktop` block, the gateway uses that value instead of the derived list. If the allowlist the gateway serves includes `*`…

v2.1.299/sandbox Documentation arrivedA small documentation edit on Claude apps gateway configuration touched a line naming /sandbox after this was published.
the line in the docs

* The egress allowlist, from `sandbox.network.allowedDomains`. If you set `coworkEgressAllowedHosts` in the policy's `desktop` block, the gateway uses that value instead of the derived list. If the allowlist the gateway serves includes `*`…

v2.1.299/sandbox Documentation arrivedA small documentation edit on Claude apps gateway configuration touched a line naming /sandbox after this was published.
the line in the docs

* The egress allowlist, from `sandbox.network.allowedDomains`. If you set `coworkEgressAllowedHosts` in the policy's `desktop` block, the gateway uses that value instead of the derived list. If the allowlist the gateway serves includes `*`…

v2.1.284allowedDomains Documentation arrivedA small documentation edit on Claude apps gateway configuration touched a line naming allowedDomains after this was published.
the line in the docs

* The egress allowlist, from `sandbox.network.allowedDomains`. If you set `coworkEgressAllowedHosts` in the policy's `desktop` block, the gateway uses that value instead of the derived list. If the allowlist the gateway serves includes `*`…

v2.1.285sandbox.network Documentation arrivedA small documentation edit on Claude apps gateway configuration touched a line naming sandbox.network after this was published.
the line in the docs

* The egress allowlist, from `sandbox.network.allowedDomains`. If you set `coworkEgressAllowedHosts` in the policy's `desktop` block, the gateway uses that value instead of the derived list. If the allowlist the gateway serves includes `*`…

v2.1.285sandbox.network Documentation arrivedA small documentation edit on Claude apps gateway configuration touched a line naming sandbox.network after this was published.
the line in the docs

* The egress allowlist, from `sandbox.network.allowedDomains`. If you set `coworkEgressAllowedHosts` in the policy's `desktop` block, the gateway uses that value instead of the derived list. If the allowlist the gateway serves includes `*`…

v2.1.283sandbox.network Documentation arrivedA small documentation edit on Claude apps gateway configuration touched a line naming sandbox.network after this was published.
the line in the docs

* The egress allowlist, from `sandbox.network.allowedDomains`. If you set `coworkEgressAllowedHosts` in the policy's `desktop` block, the gateway uses that value instead of the derived list. If the allowlist the gateway serves includes `*`…

v2.1.299run_in_background Documentation arrivedA small documentation edit on Orchestrate teams of Claude Code sessions touched a line naming run_in_background after this was published.
the line in the docs

* **No background subagents from in-process teammates**: an in-process teammate's own subagents run in the foreground, because a teammate's background work can't outlive the lead's process. Claude Code returns an error when a teammate spaw…

v2.1.299run_in_background Documentation arrivedA small documentation edit on Orchestrate teams of Claude Code sessions touched a line naming run_in_background after this was published.
the line in the docs

* **No background subagents from in-process teammates**: an in-process teammate's own subagents run in the foreground, because a teammate's background work can't outlive the lead's process. Claude Code returns an error when a teammate spaw…

v2.1.296run_in_background Documentation arrivedA small documentation edit on Orchestrate teams of Claude Code sessions touched a line naming run_in_background after this was published.
the line in the docs

* **No background subagents from in-process teammates**: an in-process teammate's own subagents run in the foreground, because a teammate's background work can't outlive the lead's process. Claude Code returns an error when a teammate spaw…

v2.1.295run_in_background Documentation arrivedA small documentation edit on Orchestrate teams of Claude Code sessions touched a line naming run_in_background after this was published.
the line in the docs

* **No background subagents from in-process teammates**: an in-process teammate's own subagents run in the foreground, because a teammate's background work can't outlive the lead's process. Claude Code returns an error when a teammate spaw…

v2.1.295run_in_background Documentation arrivedA small documentation edit on Orchestrate teams of Claude Code sessions touched a line naming run_in_background after this was published.
the line in the docs

* **No background subagents from in-process teammates**: an in-process teammate's own subagents run in the foreground, because a teammate's background work can't outlive the lead's process. Claude Code returns an error when a teammate spaw…

v2.1.292run_in_background Documentation arrivedA small documentation edit on Orchestrate teams of Claude Code sessions touched a line naming run_in_background after this was published.
the line in the docs

* **No background subagents from in-process teammates**: an in-process teammate's own subagents run in the foreground, because a teammate's background work can't outlive the lead's process. Claude Code returns an error when a teammate spaw…

v2.1.288run_in_background Documentation arrivedA small documentation edit on Orchestrate teams of Claude Code sessions touched a line naming run_in_background after this was published.
the line in the docs

* **No background subagents from in-process teammates**: an in-process teammate's own subagents run in the foreground, because a teammate's background work can't outlive the lead's process. Claude Code returns an error when a teammate spaw…

v2.1.287run_in_background Documentation arrivedA small documentation edit on Orchestrate teams of Claude Code sessions touched a line naming run_in_background after this was published.
the line in the docs

* **No background subagents from in-process teammates**: an in-process teammate's own subagents run in the foreground, because a teammate's background work can't outlive the lead's process. Claude Code returns an error when a teammate spaw…

v2.1.287run_in_background Documentation arrivedA small documentation edit on Orchestrate teams of Claude Code sessions touched a line naming run_in_background after this was published.
the line in the docs

* **No background subagents from in-process teammates**: an in-process teammate's own subagents run in the foreground, because a teammate's background work can't outlive the lead's process. Claude Code returns an error when a teammate spaw…

v2.1.287run_in_background Documentation arrivedA small documentation edit on Orchestrate teams of Claude Code sessions touched a line naming run_in_background after this was published.
the line in the docs

* **No background subagents from in-process teammates**: an in-process teammate's own subagents run in the foreground, because a teammate's background work can't outlive the lead's process. Claude Code returns an error when a teammate spaw…

v2.1.285run_in_background Documentation arrivedA small documentation edit on Orchestrate teams of Claude Code sessions touched a line naming run_in_background after this was published.
the line in the docs

* **No background subagents from in-process teammates**: an in-process teammate's own subagents run in the foreground, because a teammate's background work can't outlive the lead's process. Claude Code returns an error when a teammate spaw…

v2.1.285run_in_background Documentation arrivedA small documentation edit on Orchestrate teams of Claude Code sessions touched a line naming run_in_background after this was published.
the line in the docs

* **No background subagents from in-process teammates**: an in-process teammate's own subagents run in the foreground, because a teammate's background work can't outlive the lead's process. Claude Code returns an error when a teammate spaw…

v2.1.285run_in_background Documentation arrivedA small documentation edit on Orchestrate teams of Claude Code sessions touched a line naming run_in_background after this was published.
the line in the docs

* **No background subagents from in-process teammates**: an in-process teammate's own subagents run in the foreground, because a teammate's background work can't outlive the lead's process. Claude Code returns an error when a teammate spaw…

v2.1.285run_in_background Documentation arrivedA small documentation edit on Orchestrate teams of Claude Code sessions touched a line naming run_in_background after this was published.
the line in the docs

* **No background subagents from in-process teammates**: an in-process teammate's own subagents run in the foreground, because a teammate's background work can't outlive the lead's process. Claude Code returns an error when a teammate spaw…

v2.1.299allowed_tools Documentation arrivedAnthropic's documentation has since written up allowed_tools, on Subagents in the SDK.
the line in the docs

disallowed_tools=["Agent(fork)"],

v2.1.301disallowed_tools Documentation arrivedAnthropic's documentation has since written up disallowed_tools, on Subagents in the SDK.
the line in the docs

disallowed_tools=["Agent(fork)"],

v2.1.299disallowed_tools Documentation arrivedAnthropic's documentation has since written up disallowed_tools, on Subagents in the SDK.
the line in the docs

disallowed_tools=["Agent(fork)"],

v2.1.299disallowed_tools Documentation arrivedAnthropic's documentation has since written up disallowed_tools, on Subagents in the SDK.
the line in the docs

disallowed_tools=["Agent(fork)"],

v2.1.302/mcp Documentation arrivedA small documentation edit on How the agent loop works touched a line naming /mcp after this was published.
the line in the docs

| **Tool definitions** | Every request for core built-in tools such as Bash, Read, and Edit; on demand for MCP tools and other built-in tools, which [tool search](/docs/en/agent-sdk/mcp#mcp-tool-search) defers by default | Every schema loa…

v2.1.301/claude-api Documentation arrivedA small documentation edit on migration-guide touched a line naming /claude-api after this was published.
the line in the docs

**Automate your migration with the [Claude API skill](https://platform.claude.com/docs/en/agents-and-tools/agent-skills/claude-api-skill#migrating-to-a-newer-claude-model).** It comes bundled with Claude Code and works for any current Clau…

v2.1.302/plugin Documentation arrivedA small documentation edit on user-management touched a line naming /plugin after this was published.
the line in the docs

| [Plugins](https://platform.claude.com/docs/en/manage-claude/plugins-api) | Not available | Available in beta |

v2.1.299assets Documentation arrivedAnthropic's documentation has since written up assets, on pdf-support.
the line in the docs

curl -sL "https://assets.anthropic.com/m/1cd9d098ac3e6467/original/Claude-3-Model-Card-October-Addendum.pdf" |

v2.1.302ANTHROPIC_AUTH_TOKEN Documentation arrivedAnthropic's documentation has since written up ANTHROPIC_AUTH_TOKEN, on claude-in-microsoft-foundry.
the line in the docs

ANTHROPIC_AUTH_TOKEN="$(az account get-access-token --resource https://ai.azure.com --query accessToken -o tsv)" \

v2.1.290--file Documentation arrivedAnthropic's documentation has since written up --file, on quickstart.
the line in the docs

ant files download --file-id "$file_id" --output "${TMPDIR:-/tmp}/renewable_energy.pptx"

v2.1.301/claude-api Documentation arrivedAnthropic's documentation has since written up /claude-api, on optimizing-for-cost-and-intelligence.
the line in the docs

Setup takes little work. [Automatic caching](https://platform.claude.com/docs/en/build-with-claude/prompt-caching#automatic-caching) places breakpoints for you; otherwise, the [Claude API skill](https://platform.claude.com/docs/en/agents-a…

v2.1.299old_str Documentation arrivedAnthropic's documentation has since written up old_str, on Tools reference.
the line in the docs

A file that changed on disk after Claude last read it can still be edited when `old_string` matches the current content exactly and unambiguously and Claude Code can read the file without prompting. Matching against the file's current cont…

v2.1.292/fork Documentation arrivedAnthropic's documentation has since written up /fork, on Create custom subagents.
the line in the docs

When [agent view is turned off](/docs/en/agent-view#turn-off-agent-view), `/subtask` isn't available and `/fork` starts the forked subagent instead; otherwise `/fork` copies the whole session into a new [background session](/docs/en/agent-…

v2.1.295/clear Documentation arrivedA small documentation edit on Customize your status line touched a line naming /clear after this was published.
the line in the docs

| `cost.total_cost_usd` | Estimated session cost in USD, computed client-side at list price unless a [`modelPricing`](/docs/en/settings-reference#modelpricing) table is in effect. May differ from your actual bill. Resets to \$0 when `/clea…

v2.1.280Escape Documentation arrivedA small documentation edit on All settings touched a line naming Escape after this was published.
the line in the docs

Map two-key INSERT-mode sequences to Escape in [vim editor mode](/docs/en/interactive-mode#vim-editor-mode). Each key is exactly two printable characters typed in sequence, and `"<Esc>"` is the only supported target; Claude Code ignores ot…

v2.1.302claude --resume Documentation arrivedA small documentation edit on Manage sessions touched a line naming claude --resume after this was published.
the line in the docs

* Default display name: interactive sessions you never name still get a default display name when they start. The default combines the working directory's name with a two-character suffix, for example `my-app-3f`, and identifies the sessio…

v2.1.302/resume Documentation arrivedA small documentation edit on Manage sessions touched a line naming /resume after this was published.
the line in the docs

* Default display name: interactive sessions you never name still get a default display name when they start. The default combines the working directory's name with a two-character suffix, for example `my-app-3f`, and identifies the sessio…

v2.1.302/resume Documentation arrivedA small documentation edit on Manage sessions touched a line naming /resume after this was published.
the line in the docs

* Default display name: interactive sessions you never name still get a default display name when they start. The default combines the working directory's name with a two-character suffix, for example `my-app-3f`, and identifies the sessio…

v2.1.302/resume Documentation arrivedA small documentation edit on Manage sessions touched a line naming /resume after this was published.
the line in the docs

* Default display name: interactive sessions you never name still get a default display name when they start. The default combines the working directory's name with a two-character suffix, for example `my-app-3f`, and identifies the sessio…

v2.1.302--resume Documentation arrivedA small documentation edit on Manage sessions touched a line naming --resume after this was published.
the line in the docs

* Default display name: interactive sessions you never name still get a default display name when they start. The default combines the working directory's name with a two-character suffix, for example `my-app-3f`, and identifies the sessio…

v2.1.302--resume Documentation arrivedA small documentation edit on Manage sessions touched a line naming --resume after this was published.
the line in the docs

* Default display name: interactive sessions you never name still get a default display name when they start. The default combines the working directory's name with a two-character suffix, for example `my-app-3f`, and identifies the sessio…

v2.1.302--resume Documentation arrivedA small documentation edit on Manage sessions touched a line naming --resume after this was published.
the line in the docs

* Default display name: interactive sessions you never name still get a default display name when they start. The default combines the working directory's name with a two-character suffix, for example `my-app-3f`, and identifies the sessio…

v2.1.302--resume Documentation arrivedA small documentation edit on Manage sessions touched a line naming --resume after this was published.
the line in the docs

* Default display name: interactive sessions you never name still get a default display name when they start. The default combines the working directory's name with a two-character suffix, for example `my-app-3f`, and identifies the sessio…

v2.1.302ANTHROPIC_BASE_URL Documentation arrivedAnthropic's documentation has since written up ANTHROPIC_BASE_URL, on Monitoring.
the line in the docs

Claude Code counts each streaming response toward the cost and token metrics exactly once, including when a gateway or proxy behind `ANTHROPIC_BASE_URL` streams usage progressively across multiple frames.

v2.1.299literal Documentation arrivedAnthropic's documentation has since written up literal, on Monitoring.
the line in the docs

* For `"sdk_host_builtin_mcp"` tools: `mcp_server_name` and `mcp_tool_name` are included even when `OTEL_LOG_TOOL_DETAILS` is off, because the host application defines these names; without them, a rejected call to one of these built-in ser…

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