2026-08-22 23:11:21 +02:00
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---
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id: H-001
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title: Semantic Action Stability
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2026-08-22 23:50:29 +02:00
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status: EXPERIMENTING
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2026-08-22 23:11:21 +02:00
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created: "2026-08-22"
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experiments: [E-001]
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concepts: [C-semantic-action]
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---
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# H-001 — Semantic Action Stability
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## Claim
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A semantic action survives implementation restructuring better than a recorded UI
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interaction sequence.
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## Falsification condition
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Across the labelled mechanical mutations in the lab (T05), a recorded interaction
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sequence survives **at least as many** mutations as the semantic action does.
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If mechanics-free identity buys no measurable durability, the central abstraction
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is decorative and `SemanticAction` should be reduced to a naming convention.
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## Measurement
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Mechanical Recovery Rate for each of two arms over the same mutation set:
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- **arm A** — semantic action realized by an agentic driver;
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- **arm B** — a recorded selector-based sequence captured against the baseline.
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Arm B is a genuine control and must be run, not assumed to fail.
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## Threats to validity
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The comparison is unfair if arm B is built naively — a brittle straw man makes
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H-001 trivially true and worthless. Arm B uses the most robust selector strategy
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reasonably available (roles, labels, test ids where the lab provides them).
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2026-08-22 23:50:29 +02:00
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## Result so far (TD-WP-0002-T07)
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Twelve mechanical mutations, both arms, same semantic action:
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| | Discovery (agentic) | Recorded selectors (control) |
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|---|---|---|
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| test ids preserved (9) | 9/9 | **9/9** |
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| test ids dropped (3) | 2/3 | 0/3 |
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**Not falsified, but substantially narrowed.** Where stable identifiers survive,
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the control arm matches the agentic arm exactly — the semantic action buys
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nothing. It earns its keep only where identifiers are absent or not carried
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forward.
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Three mutations on the deciding side is directionally clear and statistically
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nothing. See `research/findings/F-0005-...` — the concept model overstates this
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and should be revised to match the evidence.
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Scope caveat (F-0004): the driver tests **structural** durability only. Visual
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relayout is untested.
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2026-08-22 23:11:21 +02:00
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## Status log
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- 2026-08-22 `PROPOSED`. No evidence.
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2026-08-22 23:50:29 +02:00
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- 2026-08-22 `EXPERIMENTING`. Partial evidence from T07; awaiting E-001 in full.
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2026-09-28 12:06:24 +02:00
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## Expanded measurement — 2026-09-28 (TD-WP-0003-T03)
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38 mutations, including ten that drop test ids and seven new paired structural
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controls. Discovery and recorded selectors both pass 17/17 preserved-id cases;
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on dropped ids discovery passes 9/10 and recorded selectors 0/10. M22 remains
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unrealizable. The full journey accepts 26/27 mechanical cases; FAR remains 0/7
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on the unchanged defect set. Claim/provenance indices remain unchanged.
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Reproduce: `PYTHONPATH=src:. python3 tools/measure_e001.py /tmp/e001.json`.
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[Raw result](../evidence/2026-09-28-e001.json).
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These selected and correlated synthetic HTML cases do not establish population
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reliability, visual/browser coverage, model capability or economics. See
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[review](../../docs/TestDriverGeneralisationReview.md) for the mechanism list and
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limits. H-001 remains supported only in the narrowed identifier-loss setting.
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