| name | vestige-trace-replay |
| description | Use this skill to re-run a stored trace against the current memory store and diff the results against the original — answering "would the agent get the same answer today?". Fire when the user says "re-run trace_X", "replay that search", "diff trace_X against current state", or "did the answers drift?". Read-only: writes a NEW query_events row tagged with replay_of; never mutates the original trace or any memory. provider_match=false flags embedding drift. |
Replay a stored query trace
Re-run a stored query trace against the current store and current embedding provider. Produces an explicit diff — added/removed result IDs, score deltas — and flags whether the provider and corpus match the original. This is the "did memory drift?" command.
When to fire
- Drift detection. After a major memory session (many records, approvals, or forgets) — confirm that prior recall results are stable.
- Provider change. Switching embedding providers or models — replay key traces to quantify the impact.
- Corpus growth audit. New memories were captured since a trace was written — replay shows what's been added to the result set.
- Regression check. Before a PR that touches recall logic — replay a set of traces and surface score deltas.
Replay is read-only with respect to memories. It writes a new query_events row tagged caller=cli (or mcp) with replay_of: <original_trace_id> in params_json, making the replay chain inspectable. The original trace is never modified.
How to invoke
vestige trace replay <trace_id> [--json]
- Accepts a
trace_<ULID> — obtain one from vestige trace (list mode).
provider_match=false in the output signals that the current embedding provider or model differs from the one in the original trace. When this happens the mode may fall back to lexical and mode_fallback=true is set.
vestige trace replay trace_01JWXXXXXXXXXXXXXXXXXX
vestige trace replay trace_01JWXXXXXXXXXXXXXXXXXX --json
After invocation
{
"trace_id": "trace_01JWXXXXXXXXXXXXXXXXXX",
"original": {
"result_ids": ["mem_01JWXXXXXXXXXXXXXXXXXX", "mem_01HVXXXXXXXXXXXXXXXXXX"],
"scores": [0.83, 0.61]
},
"current": {
"result_ids": ["mem_01JWXXXXXXXXXXXXXXXXXX", "mem_01HVXXXXXXXXXXXXXXXXXX", "mem_01KAXXXXXXXXXXXXXXXXXX"],
"scores": [0.83, 0.61, 0.55]
},
"diff": {
"added": ["mem_01KAXXXXXXXXXXXXXXXXXX"],
"removed": [],
"score_changes": []
},
"provider_match": true,
"mode_fallback": false,
"corpus_drift": 1,
"replay_trace_id": "trace_01KBXXXXXXXXXXXXXXXXXX"
}
corpus_drift is the net change in result count. replay_trace_id is the ID of the new query_events row written for this replay run — inspect it with vestige-trace-show <replay_trace_id>.
