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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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Claude Code v2.1.221

Claude.ai export importer hardened, project instructions moved out of CLAUDE.md

You'll notice
Useful4 Signal0
Internals not in their notes

Claude.ai imports are validated, and project instructions now land in project-instructions.md instead of CLAUDE.md.

project-instructions.md
What

The importer now validates the export JSON before trusting it, and imported content can no longer masquerade as agent configuration.

Details
  • every field is type-checked (uuid, name, prompt_template, docs, files entries) and malformed records are skipped rather than imported
  • project directory names are capped at 200 characters against a name pattern; imported filenames are sanitised to at most 128 characters
  • a project's prompt template is written to project-instructions.md instead of CLAUDE.md
  • any imported doc or file whose name would collide with an agent-config file (claude.md, .claude*, .cursorrules, .windsurfrules, .clinerules, project-instructions.md and similar) is prefixed so it cannot be picked up as configuration
Evidence

project-instructions.md

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 v2.1.221 →