Tag

#hooks

3 posts tagged.

Unknown hook type: Claude Agent SDK 0.3.257 Drops the Hook, Not the File (2026)

Since @anthropic-ai/claude-agent-sdk 0.3.257 a malformed hook entry is deleted from settings.json and the rest of the file loads normally, so the hook just never runs. PreToolUse and PermissionRequest are the two exceptions, where the whole file is voided. Bisected against 0.3.252, with a runnable detector.

September 14, 20267 min read124

Tutorials

TodoWrite No Longer Available: Claude Code's 2.1.233 Tool Gate (2026)

"TodoWrite no longer available" is not a bug. Claude Code v2.1.233 drops the five task-tracking tools on Sonnet 5 and newer unless you opt in. The gate follows the session, not the model, and the SDK opt-in line behaves differently in TypeScript and Python (2026).

September 3, 20269 min read327

AI agents

Claude Agent SDK Hooks: Block, Modify, and Audit Tool Calls (2026)

Register PreToolUse and PostToolUse hooks in the Claude Agent SDK to block dangerous tool calls, rewrite a tool's arguments, and audit every action. Copy-paste runnable Python and TypeScript, August 2026.

August 13, 20269 min read340