Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
VSCode ExtensionArea: what it touches
Bug FixesKind: in v2.1.280,
Bug FixesSection of the release
What
The claude edit-hook command, used internally by the VS Code extension to apply a single JSON-formatted edit read from standard input, now checks the CLAUDE_CODE_CHILD_SESSION environment variable. If that variable is set, meaning the command was spawned by Claude Code itself rather than run directly, it logs a telemetry event and returns a refusal message instead of reading and applying the edit.
Why
This stops claude edit-hook from being triggered accidentally from within a nested Claude Code process, which could otherwise apply unintended edits.
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.
Confirmed sinceAnthropic's documentation has since written up CLAUDE_CODE_CHILD_SESSION, on Error reference.| `Transcript saving is off — inherited CLAUDE_CODE_CHILD_SESSION marker` | [Session saving warnings](#transcript-saving-is-off-child-session-marker) |errorssee the edit
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's documentation agreesAnthropic's documentation has since written up CLAUDE_CODE_CHILD_SESSION, on Error reference.
