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 v2.1.227 Home All releases olderv2.1.226 v2.1.228newer
Claude Code v2.1.227

Notebook reads and edits now refuse files over 100 MB

You'll notice
Useful3 Signal2
Notebooks

Notebooks over 100 MB are refused for reads and edits, with a suggestion to slice them.

What

NotebookRead checks the file before opening it and refuses anything larger than 104857600 bytes, suggesting you slice it with jq or PowerShell instead. NotebookEdit refuses an edit that would push the notebook past the same limit and leaves the file untouched.

Details
  • Non-regular files (devices, FIFOs, sockets) are rejected outright.
  • A structural check now rejects files that are not real notebooks: the top-level cells must be an array of cell objects each with a string or string-array source.
Evidence

Notebook file is not a valid Jupyter notebook (top-level "cells" must be an array of cell objects, each with a string or string-array "source").

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.227 →