Chamber MCP server

Chamber

Ask questions about your own notes. Get answers that cite their sources — and a daily check that tells you when a source has changed underneath a conclusion you already trusted.

Zero runtime dependencies. Everything is node:sqlite and files on your disk. No account, no cloud call unless you point it at one.

See it in two minutes

Requires Node 23.6+ — Chamber runs TypeScript directly, with no build step.

git clone <this repo> chamber && cd chamber
npm ci && node --experimental-strip-types src/cli.ts try

No config, no database, no model, no network. It builds a throwaway workspace, runs the real code paths against it, and deletes it (--keep to look around).

That recording is scripted from assets/demo.tape rather than hand-captured, so it is regenerated when the output changes instead of quietly showing a version of Chamber that no longer exists. Everything below is the same command's actual output, trimmed:

$ chamber believe belief "Customers may return any purchase within 30 days of delivery."
  committed blf_ddcf4f3c9b2e81b8
  an unsourced assertion is not refused — it mints citation debt.

$ chamber debts
  dbt_18bd1c1171cdbfcb  [pending]

$ chamber pay-debt
  proposed 2 source(s), 2 pinned; best=0.694

$ chamber verify
  blf_ddcf4f3c9b2e81b8  2/2 pins verified

That is the ordinary state: a belief standing on evidence that still holds. Then someone edits the note it was built on — 30 days becomes 14 days:

$ chamber ingest ./notes
  ingested 2 file(s) as 4 passage(s)

$ chamber verify
  blf_ddcf4f3c9b2e81b8  1/2 pins verified
    hash_mismatch: refunds.md#p0

Nobody asked it to re-examine that belief. The conclusion did not change; the ground under it did, and the exit code is non-zero, so a scheduled job can act on it. That is the whole product.

Four more scenarios — a rolled-back ledger caught by an outside anchor, a sandbox that refuses rather than degrade, a hostile tool catalogue rejected — are in demos/, and run in CI so they cannot drift from the code.

A dictionary for the words above

Everything Chamber does is rows in one SQLite file. Each term in the transcripts names a table or a hash:

None of it is hidden machinery: sqlite3 ~/.local/share/chamber/chamber.sqlite '.tables' shows the whole thing.

Answers that cite their sources

With a model configured, chamber ask judges every sentence on its own citations. Against the same two sample notes, on a local 30B:

Shortened. The full README is on GitHub.