Source Intelligence

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.

All of v2.1.40 Home All releases olderv2.1.39 v2.1.41newer
Claude Code v2.1.40

Nested Session Detection

What

Prevents launching Claude Code inside another Claude Code session.

Details
  • Detects when running inside an existing Claude Code session
  • Displays clear error explaining the issue
  • Provides bypass instructions via CLAUDECODE environment variable
Evidence

Nested session check (search for "cannot be launched inside another Claude Code session")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.40 →