Hooks can now insert transcript entries at the tail as well as the head
When a hook (custom code that runs at certain points in Claude Code) injects new entries into the transcript, those entries could previously only be prepended to the start. Now the hook can specify a placement of either "head" (the old prepend behavior) or the new "tail," which appends the entries at the end instead and can extend the tracked length of restored transcript.
This gives hook authors control over whether their injected content appears before or after existing transcript entries, useful for hooks that want to append rather than prepend information.
The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.
If Slack says "You don't have permission to invite people to this channel", the channel or workspace limits who can add people. In Slack, open **Channel details** → **Agents & apps** (called **Integrations** in some Slack versions), select…claude-tag/users/getting-started see the edit
Whether [`ANTHROPIC_CUSTOM_HEADERS`](/docs/en/env-vars#variables) needs approval also depends on the delivered value. Headers that only tag requests, such as `Accept-Language`, apply without the dialog. A line that names a credential, an o…server-managed-settings see the edit
1. Client ID Metadata Document (CIMD). Every customer's authorization server must advertise both CIMD values listed in [DCR and CIMD details](#dcr-and-cimd-details).connectors/building/authentication see the edit
* **A field at the wrong level**: compare each field's placement against the [JSON output](/docs/en/hooks#json-output) format. For example, `permissionDecision` belongs inside `hookSpecificOutput`, not at the top level.hooks-guide see the edit
* Added `/output-style [name]` to list and switch output styles, including over Remote Control and in cloud and other headless sessionschangelog see the edit
Anthropic's documentation has since written up head, on Claude Code changelog.