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How to check what the knowledge said before a change with Kyb

Query the base as it stood on a past date and diff an entry to see what moved.

Authorization notice. Kyb is dual-use. Only use it on software, sites and systems you own or have explicit permission to test.

Who it is forAn engineer debugging a regression who needs to know which infrastructure facts were true when the problem started.

The problemCurrent documentation hides what was true last week, so it is hard to tell whether a change in the base caused a failure.

The outcomeA snapshot of the knowledge base at a chosen date and a diff of one entry between versions.

What you need first

  • A Rust toolchain with cargo, to run cargo install knowyourbusiness --locked
  • A host or Docker setup where the kyb-server process can keep its data directory
  • Network access from agent machines to the server port, default 127.0.0.1:9310
  • Optional: a model directory with model.onnx and tokenizer.json for hybrid search; without it the server runs lexical-only

Steps

  1. Query the snapshot with kyb query "nats streams" --as-of 2026-08-01.
  2. List what changed in a window with kyb query "" --changed-between 2026-08-01,2026-08-07.
  3. Diff one entry with kyb diff nats-streams.
  4. Export every key at one commit with kyb export --out kyb.jsonl if you need a full copy.

Prompt for your agent

Use the KYB repo at alex09x/kyb. Run `kyb query "<topic>" --as-of <YYYY-MM-DD>` and report the entries that were current on that date. Expected output: a list of keys with the version that was active. Verify one result by running `kyb diff <key>` and confirming the change dates.

Caveat. The README says the CLI refuses these time queries if the server is too old, so confirm the server version through /healthz before relying on the answer.

Use this in your AI agent

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Using the Deduped MCP, get the setup steps for alex09x/kyb and "Check what the knowledge said before a change"

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