tegwick
44faf3de8e
Two decisions taken with the operator: stdlib HTML driver instead of Playwright (F-0004), and a deterministic discovery runtime instead of a live model. Both sit behind interfaces so the alternatives drop in later. - html.py: stdlib DOM parse and query - agentic.py: DiscoveryRuntime (agentic arm, ignores data-td by construction) and RecordedSelectorRuntime (control arm, uses the strongest identifier the page offers) - browser.py: per-actor sessions over real HTTP, constructed per call so no actor inherits another's connection state - cost/nondeterminism metrics recorded from the first run F-0005 (CONCEPT_DRIFT): the H-001 result is a narrowing. Where test ids are preserved, discovery 9/9 and recorded selectors 9/9 - the semantic action buys nothing. Where they are dropped, discovery 2/3 and recorded 0/3. The concept model presents semantic actions as generally superior; the evidence says conditionally superior. M21 and M22 added mid-task: the deciding side of the axis was N=1. M22 (field names renamed) defeats the heuristic and is the first concrete evidence that a live model would add capability, not just cost. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Assistant: claude-code Assistant-Model: opus Assistant-Process: 1629012@bnt-lap001 Assistant-Session: 78d4fb13-8a1e-474b-87a3-9b9261c49a39
52 lines
1.9 KiB
Markdown
52 lines
1.9 KiB
Markdown
---
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id: H-002
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title: Mechanical Adaptation
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status: EXPERIMENTING
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created: "2026-08-22"
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experiments: [E-001]
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concepts: [C-adaptation]
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---
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# H-002 — Mechanical Adaptation
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## Claim
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An agentic driver can recover from a mechanical implementation change without
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modifying the semantics of the protected use case.
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## Falsification condition
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Either:
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- the driver fails to recover from a majority of labelled `MECHANICAL` mutations
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(recovery is not achievable in practice); **or**
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- recovery is achieved only in runs where claims or invariants were altered
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(recovery is achievable but not semantics-preserving).
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The second branch matters more than the first. A high recovery rate purchased by
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weakening assertions falsifies this hypothesis just as decisively as no recovery
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at all.
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## Measurement
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- Mechanical Recovery Rate over `MECHANICAL`-labelled mutations.
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- Claim/invariant diff per run — expected to be empty by construction
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(`docs/TestDriverClassificationDesign.md` D-02). Any non-empty diff is both a
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falsification signal **and** a framework defect, since no write path should exist.
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## Result so far (TD-WP-0002-T07)
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Discovery recovered from 11 of 12 mechanical mutations with **no claim or
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invariant diff in any run**, as D-02 requires structurally. The single failure
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(M22, field names renamed) failed *loudly* — a `RealizationFailed` recorded in
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evidence, not a silent pass. That distinction is the one that matters: the
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framework reported that it could not act, rather than reporting that nothing was
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wrong.
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Full classification of recovery vs defect is T08.
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## Status log
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- 2026-08-22 `PROPOSED`.
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- 2026-08-22 `EXPERIMENTING`. Recovery demonstrated; classification pending T08. Design decision D-02 makes the second falsification
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branch structurally unreachable; the measurement is retained anyway, as an
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assertion that the architecture is what we believe it is.
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