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Sweep 28 Aug 2026 · 00:00Z Build v2.1.250 478 read Stable v2.1.236 Latest v2.1.250 Next v2.1.251 Feeds RSS JSON llms.txt
Reading a new release v2.1.251 Analysing changes · 2/5 Deeper second pass · 0/5 agents 427 findings $12.75 so far

DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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10 pages for subagentstop.

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How the agent loop works Claude Code CLI · in the page agent-sdk/agent-loop …| Validate the result, save session state | | `SubagentStart` / `SubagentStop` | When a subagent spawns or completes | Track and aggregate parallel task results | | `PreCompact`… Intercept and control agent behavior with hooks Claude Code CLI · in the page agent-sdk/hooks …| | `SubagentStop` | Yes | Yes | Subagent completion… Agent SDK reference - Python Claude Code CLI · in the page agent-sdk/python …r submits a prompt "Stop", # Called when stopping execution "SubagentStop", # Called when a subagent stops "PreCompact", # Called before message compaction "Notification", # Called… Agent SDK reference - TypeScript Claude Code CLI · in the page agent-sdk/typescript …| "SessionEnd" | "Stop" | "StopFailure" | "SubagentStart" | "SubagentStop" | "PreCompact" | "PostCompact" | "PermissionRequest" | "PermissionDenied" | "Setup" | "TeammateIdle" |… Claude Code changelog Claude Code CLI · in the page changelog …oard, preserving formatting when pasted elsewhere * Hooks: Stop and SubagentStop hooks can now return `hookSpecificOutput.additionalContext` to give Claude feedback and keep the turn going without b… Hooks reference Claude Code CLI · in the page hooks …| | `SubagentStop` | When a subagent finishes… Automate actions with hooks Claude Code CLI · in the page hooks-guide …| | `SubagentStop` | When a subagent finishes… Plugins reference Claude Code CLI · in the page plugins-reference …| | `SubagentStop` | When a subagent finishes… Create custom subagents Claude Code CLI · in the page sub-agents …e same way they do in the main conversation, and `SubagentStart` and `SubagentStop` fire when a subagent starts or finishes Hooks from [settings files, managed policy settings, and plugins](/docs/en/… Week 23 · June 1–5, 2026 Claude Code CLI · in the page whats-new/2026-w23 …t in the prompt</div> <div><a href="/docs/docs/en/hooks">Stop and SubagentStop hooks</a> can return <code>hookSpecificOutput.additionalContext</code> to give Claude feedback and keep the turn goin…