Browser Replay

Re-drive a recorded session trajectory. Used for regression testing, deterministic re-runs, and as the verification path that browser-record plus browser-selectors actually produces something replayable.

This skill is the load-bearing assumption of the v0.2.0 architecture. ADR-0001 Verification §4 requires ≥80% replay success across 10 distinct sites of varying drift profiles before the proposal moves from Proposed → Accepted. If you find replay unreliable, capture the failure modes in findings.md and report them up the ADR.

When to use

• Regression-testing a UI flow after a deploy.
• Reproducing a bug captured in a prior session.
• Comparing two runs of the same flow for browser-screenshot-diff.
• Forking a session (/ruflo-browser fork) and replaying the parent before mutating.

Steps

1. Locate the source session:

   npx -y [email protected] rvf status <session-id>.rvf

1. Load the trajectory:

   Read .../trajectory.ndjson

Each line is {ts, action, args, selector, result}.

1. Open a fresh browser via mcp__claude-flow__browser_open (target URL = original or --url override).
2. For each trajectory step, dispatch the matching MCP tool (browser_click, browser_fill, browser_eval, etc.) with the recorded args.
3. On selector miss, do not fail immediately — query the browser-selectors namespace for an embedding-similar selector for the same <host>:<intent> and retry once:

   npx -y @claude-flow/cli@latest memory search --namespace browser-selectors \
     --query "<host> <intent>" --limit 5

1. Record a new trajectory for the replay run (allocate a fresh RVF container, lineage-tracked via rvf derive).
2. Verdict: tally matched-step / total-step ratio. Default tolerance threshold is 0.85 (configurable via --tolerance). Verdict goes into findings.md.

Caveats

• Browserbase explicitly does not offer replay (rrweb session replay was deprecated). We're betting on selector-embedding recovery; expect noise on heavily drifted sites.
• Network nondeterminism (timing, content variation) can produce false-fail verdicts. Use --mutate to inject expected variation or pin to a fixture.
• For visual diff, chain into browser-screenshot-diff against the parent session id.
• If selector recovery requires more than one retry per step, log it. That's the signal that the site needs a re-record, not a replay.