Amp

Amp (Sourcegraph) stores one JSON object per thread under its local data

directory:

  • Linux: ${XDG_DATA_HOME}/amp/threads/, or ~/.local/share/amp/threads/

when XDG_DATA_HOME is unset.

  • macOS and Windows: ~/.local/share/amp/threads/.
  • DEJA_AMP_ROOT replaces the thread directory directly. When set, it is the

only root deja reads.

Each *.json file is one thread. The parser uses id as the stable session ID,

title as the session title, and the first env.initial.trees[0].uri when it

is a file:// URI to derive the project name from its final path component.

If that working-directory URI is absent or not a file URI, the project falls

back to the title.

A thread's messages are retained only for user and assistant roles. Within

each message, blocks with type: "text" are joined in order; other block types

are ignored. Amp does not write per-message timestamps, so every retained

message uses the thread's created Unix-millisecond timestamp. This is an

intentional approximation for ordering and recency, not an inferred message

time.

A malformed or truncated JSON file is reported as a per-file ingestion error

and skipped by discovery/load and index rebuilds; it does not prevent other

thread files from being indexed. Amp thread files are not append-only, so deja

uses the normal full-file parse path when a file changes.

Synthetic fixture

fixtures/registry/amp/thread.json

is a minimal conformance sample with deterministic IDs, paths, and timestamps.

It contains no personal data or credentials.

Last verified: 2026-09-02

deja reads this format and twenty-four others, and turns what it finds into memory your agents can search. See the harness matrix for what is wired where, or install it and search your own history.