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Home / Reference / Hook events

SubagentStop

hook never mined documented JSON

A Claude Code hook event, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.

When a subagent finishes

Anthropic's own wording. Read off Hooks reference, captured 2026-10-22.

First seen — never in a mined build
Last seen — never in a mined build
Builds0 / 150on this box, as of v2.1.309
Written about v1.0.41 first named in a changelog, 2 Jul 2025

In the changelogs

11

Releases whose published page names SubagentStop.

  1. v2.1.304
    Plugin mods are now checked for a screen-drawing hook

    Claude Code now looks for a ui.render hook in plugin mods, and drafts written into the input box can carry decorations

    found in this entry's text

  2. v2.1.295
    Hooks can now block the action when they fail

    A new hook option set to block makes a hook that fails, times out or returns bad output stop the action it guards

    found in this entry's text

  3. v2.1.286
    Plugin test scans cover SubagentStop hooks, MCP connections and toasts

    The plugin test scan list now includes the SubagentStop hook and calls to connect to MCP servers and show toasts, and drops two calls

    found in this entry's text

  4. v2.1.275
    SubagentStop hook event

    A SubagentStop hook now fires when a subagent finishes, alongside the existing SubagentStart hook

    found in this entry's text, named in this entry

  5. v2.1.248
    Hook schema failures now print the exact field, a template, and which tool failed

    A bad hook response now shows the exact failing field, the output and a template.

    found in this entry's text

  6. v2.1.163
    SubagentStop Hook Event

    found in this entry's text

  7. v2.1.163
  8. v2.1.133
    Reasoning Effort Exposed to Hooks and Bash

    found in this entry's text

  9. v2.1.63
  10. v2.1.26
    SubagentStop Hook Documentation

    found in this entry's text

  11. v1.0.41
    New SubagentStop Hook Event

    found in this entry's text

First cited

3

The earliest release whose published evidence quoted SubagentStop was v2.1.163, 4 Jun 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.

ReleaseDateThe span that was quoted
v2.1.1634 Jun 2026Hook-specific output for the SubagentStop event
v2.1.27517 Sep 2026case "SubagentStop":
v2.1.28630 Sep 2026classic.SubagentStop

Presence across releases

0

The miner has never read a build containing this name. It is here because a changelog entry of ours names it, which is evidence that it existed and not evidence of which releases carried it. The inventory starts at v2.1.138 and everything older than that was never mined.

Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the hook event does. All hook events.

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