research(atlas): boundary-drift measurement — how much a paragraph's vector/rank moves with different embedding neighbors #6038

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4. dezren39 commented on Nov 5, 2026

   

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   🤖 Agent note · handed off

   • Agent: queue worker (repo-worker-code), lane code-a
   • Session / ID: task 10404
   • Found via: queue claim
   • Task: task 10404 (triage for issue research(atlas): boundary-drift measurement — how much a paragraph's vector/rank moves with different embedding neighbors #6038) is assigned to the opencode execution lane — handing off to the opencode claimant, which launches the bound session. This lane did not work the triage itself. Verified fresh: issue research(atlas): boundary-drift measurement — how much a paragraph's vector/rank moves with different embedding neighbors #6038 is OPEN with no hard-stop labels (no held, user/owned, do-not-merge, do-not-auto-edit).
   • Expectation: claimant launches the bound opencode session for task 10404; if unbound by lease/park expiry, task 10404 returns to the queue.
   • Links: task 10404 (repo-health-code-pilot), assigned_lane=opencode
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   • Agent: queue worker (repo-worker-code), lane code-j
   • Session / ID: task 10404
   • Found via: queue claim
   • Task: Handing off task 10404 for issue research(atlas): boundary-drift measurement — how much a paragraph's vector/rank moves with different embedding neighbors #6038 to the opencode execution lane; claimant launches the bound opencode session. Parking task 10404 for 1800s pending claimant launch.
   • Expectation: triage of issue research(atlas): boundary-drift measurement — how much a paragraph's vector/rank moves with different embedding neighbors #6038 per task 10404 acceptance
   • Links: issue research(atlas): boundary-drift measurement — how much a paragraph's vector/rank moves with different embedding neighbors #6038
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11. dezren39 commented on Nov 5, 2026

    

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    🤖 Agent note · picked up

    • Agent: queue worker (repo-worker-code, OpenChamber scheduled lane 8ac61616-3815-4e7b-b33d-840a3829154a)
    • Task: 10404, triage for issue research(atlas): boundary-drift measurement — how much a paragraph's vector/rank moves with different embedding neighbors #6038.
    • Revalidated: issue OPEN, currently assigned to Drew, but has none of the hard-stop labels held, user/owned, do-not-merge, or do-not-auto-edit. Fresh PR search for 6038 found only unrelated merged PR Phase 4: read-only replica world service and spectators (#806) #4708.
    • Next: assess the research request against current repository state and route it with evidence.
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13. dezren39 commented on Nov 5, 2026

    

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    Triage — task 10404 (2026-11-05)

    Verdict: valid, distinct research gap; keep #6038 open as the scoped research follow-up. The request is not implemented or superseded. Fresh checks: #6038 OPEN; no hard-stop labels; no linked PR (the only search hit, #4708, is unrelated and merged). Parent #6028 research notes list #6038 as a parallel measurement gate; the qualitative discussion does not provide the requested measurements.

    Current-main evidence: laptop main was fetched and fast-forwarded (already up to date); local HEAD and GitHub main both equal 50237a7debf6e9114122c593a15a467858d2bf9a. pkgs/atlas-search/crates/atlas-embed/src/lib.rs:149-170 embeds input text; crates/atlas-embed/tests/gate_a.rs:57-139 tests fixed probes/model parity, not changed-neighbor drift. crates/atlas-core/eval.rs:118-125 consumes precomputed document rankings; eval/README.md:61-70 says its smoke fixture is synthetic and no real held-out set is in the harness. No boundary-drift report or experiment was found.

    Scoped route: run the bounded offline experiment in #6038: sample real paragraph-bearing chunks; keep model and query set fixed; compare each target embedded in original vs perturbed windows; report cosine drift and vector-rank/top-K movement (median/p95, split by perturbation or source type), then state a reuse rule and link results from #6035. Keep corpus text private; synthetic fixtures are not evidence. This can proceed in parallel with #6035 schema design, whose byte-identical reuse/context-reference contract should consume the result. No code changes or duplicate queue packet: #6038 itself is the existing scoped follow-up issue. No tests/builds run.