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cellar speaks MCP, so a coding assistant can run it for you. Instead of remembering flags, you ask “what changed in WhatsApp Web’s group code this release” and the assistant picks the commands.

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Install

These recipes are run with just. If you do not have it yet:
Then, from the cellar checkout:
Each recipe does three things:
1

Installs the binary

Puts cellar at ~/.cargo/bin/cellar, so the assistant does not depend on your checkout staying where it is.
2

Registers the MCP server

Runs claude mcp add or codex mcp add at user scope, so it is available in every project rather than just this one.
3

Installs the skill

Copies a skill file that tells the assistant what cellar is for, which command answers which question, and how to read the results.
Check that it connected:

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What the skill adds

The MCP server exposes the commands. The skill teaches judgement, which matters more than it sounds. Without it an assistant will happily run an unfiltered search across 187,000 modules and drown in Facebook login screens. The skill tells it to narrow by name first, to pick a filter deliberately, and to reach for the dependent graph when asked “what uses this” instead of trying to grep for it. It also tells the assistant to read the extraction diagnostics before trusting an empty result, so “I found nothing” and “the download was incomplete” do not get reported the same way.

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The tools

Sixteen tools, mirroring the CLI. Read-only tools are marked as such, so an assistant knows which are safe to run without asking. bundle_remove requires an explicit confirm: true. bundle_add is the only tool marked as reaching the network.
Every result includes the absolute path of the module it refers to. That means the assistant can start with a cellar query and finish with its own file reading and grep, which is usually faster than another round trip through the tool.

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Things worth asking it

Once installed, these all work as plain requests:
  • “What changed in WhatsApp Web between the two versions I have? Skip the noise.”
  • “Find where WhatsApp Web builds the stanza for disappearing messages.”
  • “What uses WAWebSendMsgStanza? Draw it as a diagram.”
  • “Are there any new protobuf fields in the latest release?”
  • “Show me every new module related to newsletters, and read the interesting ones.”

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Running it manually

If you want to connect cellar to something else, the server speaks JSON-RPC over stdio:
A failing tool returns a normal response with isError: true and the message as content, rather than a transport error, so the model can read what went wrong and try something else.