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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 v2.1.69 4 Mar 2026

MCPB Bundle Tooling

What

Infrastructure for creating, validating, packing, and unpacking MCP Bundle (MCPB) files — a packaging format for MCP server plugins.

Usage

mcpb pack       # Create a .mcpb bundle from a directory
mcpb validate   # Validate a manifest.json

Details

Interactive manifest.json creation wizard with prompts for name, version, tools, prompts, screenshots, and more
.mcpbignore support to exclude files from bundles
Schema validation for manifest files
Bundle unpacking and verification
Supports Node.js and Python version constraints
Platform compatibility settings (macOS, Linux, Windows)

Evidence

MCPB support (search for "A MCPB bundle", "mcpb pack", ".mcpbignore")

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

See this entry in the whole of v2.1.69 →