Unclear Which module this is and what it does when one of those commands runs is not confirmed.
What
Plugins can ship hooks modules: code that runs when certain events happen in Claude Code. command.run is the event for running a slash command, and tool.call is the event for Claude using a tool. Claude Code now checks before handing an event to a module whether that module wants it.
command.run: a module's registration now records arunCommandslist. A command goes to the module only if the module has acommand.runhook and either lists no commands or lists that one. Before, every slash command went to it.runCommandsalso now appears in module analysis output.- A built-in module, the one that reads
CLAUDE_CODE_DISABLE_FILE_CHECKPOINTING, now declaresrunCommands: ["clear", "diff", "resume"]. Its hook now fires only for/clear,/diffand/resume. tool.call: the event now declarespinnedKeys. When a module's matcher rejects an event on a pinned key, Claude Code skips that module in the main process instead of sending the event to it. If the matcher fails with an error there, Claude Code logs "matcher threw on the host ...; the hop decides" and lets the module decide.
Why
Modules no longer receive every slash command or every tool call when they only care about some. This avoids an extra round trip to the module for events it would ignore anyway. Plugin authors can rely on a command.run hook seeing only the commands it lists.
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.
Added since
A small documentation edit on Create custom subagents touched a line naming /clear after this was published.
`SendMessage` checks that a name still refers to the same agent it reached earlier in the conversation. If a newer agent has taken the name, such as a re-spawned background agent that reused it, Claude Code refuses the send rather than del…sub-agents see the edit
Added since
A small documentation edit on Fullscreen rendering touched a line naming /diff after this was published.
In fullscreen rendering, [`/diff`](/docs/en/interactive-mode#review-changes-with-%2Fdiff) opens a panel beside the conversation, so you can watch the changes accumulate while Claude works. [Diff panel](/docs/en/interactive-mode#diff-panel)…fullscreen see the edit
Added since
A small documentation edit on Manage sessions touched a line naming /resume after this was published.
Once you name a session through a CLI route or from claude.ai, return to it with `claude --resume <name>` or `/resume <name>`; a desktop-app session resumes in the [desktop app](/docs/en/desktop#work-in-parallel-with-sessions). See [Resume…sessions see the edit
Confirmed since
Anthropic's documentation has since written up /diff, on Customize keyboard shortcuts.
| `app:toggleReplTab` | (unbound) | Open or close the diff panel, the same as running `/diff` |keybindings see the edit
Confirmed since
Anthropic's documentation has since written up /resume, on Desktop application.
| `--resume`, `--continue` | Click a session in the sidebar, or type `/resume` in the prompt box to pick up a session you started from the CLI |desktop see the edit
Confirmed since
Anthropic's documentation has since written up /clear, on Hooks reference.
`SessionStart` at launch, including with `--continue` or `--resume`, and every `Setup` event fire before the session's MCP servers are available to hooks. Claude Code skips their `mcp_tool` hooks without calling the tool, and the [debug lo…hooks see the edit
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
Which module this is and what it does when one of those commands runs is not confirmed.
Anthropic's documentation agrees
Anthropic's documentation has since written up /clear, on Hooks reference.
Anthropic's release notes agree
Improved lists in /help, /hooks, /copy, /chrome, /memory, /ide, /release-notes, /rewind, /diff, /remote-env, /plugin and other pickers with…