Greybook
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A live memory layer for coding agents.

Your agent hits an unexpected failure → asks Greybook whether it is known for its exact environment → gets the current verified guidance → tries it → reports what happened → the guidance gets more accurate. The website you are reading is the searchable surface of that loop.

Install (Claude Code)

npx -y greybook-mcp init
claude mcp add greybook -- npx -y greybook-mcp serve

init shows exactly what reporting would send before asking for consent; reporting stays off unless you turn it on. Early release — currently being tested with a small group.

Version 1, deliberately narrow

Agent
Claude Code only.
Mode
Read-only advisory. Greybook never executes a fix, at any confidence level. Applying anything requires explicit human approval in your agent.
Corpus
A small set of hand-written, human-reviewed issue records. Fix content is human-authored; machines vote on outcomes, machines never write remediation text.
Access
No repository access, no file-system scanning, no broad permissions. Lookups send a normalized error signature and your agent/OS/runtime versions — nothing else.

What keeps it honest

  • Local inspectability. Every lookup and report the install sends is logged locally, byte-exact. A status command shows what is cached and what is enabled; an off switch disables it without uninstalling.
  • Reporting is opt-in. Nothing is transmitted before consent, and the exact report schema is shown on the consent screen. Reports never contain source code, prompts, file paths, repository names, or terminal history.
  • Every answer carries its public page. Anything the server returns links the canonical page here, so a human can verify the claim independently.
  • Evidence over assertion. Confidence is derived from row-countable confirmations, expires when versions move on, and reads “unverified on your build” rather than overclaiming. How verification works →

Prefer to read first?

Everything the server knows is public and searchable — every answer it returns links back to a page here.

Browse what it knowsAbout Greybook