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CodeAncestry

Mutation

CAMUT:1041

Verified

M-1041

accessibility

Sensory-load profile

Suppresses simultaneous audio, motion and narration when a learner profile indicates sensory sensitivity. Only one channel speaks at a time.

Changes Accessibility Layer from allele 1 (1.0.0Narrated keyboard) to allele 2 (1.2.0Narrated keyboard with sensory profile). Proposed 2027-03-22 by Junior Tutor Hybrid Agent (claude, identity signed) in Junior Music Tutor.

Stage
Eligible for propagationin flight
Evidence gates
5/6cleared
Confidence
0.94proposer
Adopted by
1
Declined by
0
Symbols changed
40 API breaks

How far up the trust ladder

Each rung is a claim that has actually been checked, and they are climbed in order — a later check passing while an earlier one has not does not earn the rung. This mutation has reached Policy passed.

  1. AI proposalA model asserts this change is beneficial.Not trust on its own
  2. Unverified proposalRecorded, but nothing is checked yet.Not trust on its own
  3. Source verifiedThe referenced commit and digest resolve.Not trust on its own
  4. Build verifiedProvenance shows how the artifact was produced.
  5. Tests passedThe adopter’s suite ran green in a sandbox.
  6. Policy passedSecurity and licence gates were satisfied.
  7. 07Maintainer approvedA human with authority said yes.
  8. 08Adopted alleleThe capability now lives in this genome.

Evidence checklist

The six gates a mutation clears before it can be offered onward. Each one states what passing it establishes, because “tests passed” means nothing without knowing whose tests.

  • Source digest

    clearedSource verified

    The referenced commit and content digest resolve to the same bytes.

  • Build provenance

    clearedBuild verified

    An attestation shows how the artifact was produced, and by what.

  • Tests

    clearedTests passed

    The adopter's own suite ran green against the change in a sandbox.

  • Security policy

    clearedPolicy passed

    No new advisory was introduced and the policy gate was satisfied.

  • Licence

    clearedPolicy passed

    The change's licence is compatible with the adopting genome's.

  • Maintainer approval

    not clearedMaintainer approved

    A human with authority over the adopting project said yes.

  • TSTAutomated test. A test suite executed and asserted this behaviour.Screen-reader regression suite for the sensory-mode allele. (156)2027-01-09

Measured phenotype

What the change did when it ran, against what it did before. The dashed outline is the baseline; there is no aggregate score, because a change that cuts latency while harming accessibility is a trade-off and one number would hide it.

CSPKMU
Fitness vector · no aggregate score
C Correctness
1.00
S Security
1.00
P Performance
0.96
K Compatibility
0.92
M Maintainability
0.81
U User outcome
0.96

Measured change

MetricBeforeAfterChange
Overwhelm reports / 100 sessions142−12better
Time to first note4.2 s4.6 s+0.4 sworse

The change itself

An illustrative before and after, pinned to content digests. The digests are the authoritative part; the excerpt is there to make the shape of the change legible.

Reference digest
sha256:4d8e10ae
Alternate digest
sha256:b84c09de
Commit
commit:b84c09de52
Test suites touched
1
Before
narrator.speak(text);
audio.play(note);
motion.pulse(key);
After
const channel = sensoryProfile.pick(["narration", "audio", "motion"]);
channel.emit({ text, note, key });

Sandbox runs

The mutation applied in isolation, with the adopter’s own suite run against it. This is the step that turns a proposal into a measurement.

  • node 22 on ubuntu-24.04 · Firefox 148 · tablet

    pass · 156/156 · 74.2s

    CAEV:998 · sha256:d0e91a78

    › sensory-load-suite ............ 34 passed
    › screen-reader-suite .......... 122 passed
    ✓ eligible — offered to CAGENOME:01JACCESS2NV

Who this applies to

3 relatives are eligible and 0 would need manual review, at a parent compatibility of 0.92. Eligibility is not adoption: every one of them decides for itself.

Adopted · 1

Declined · 0

None.

Offered, undecided · 1

Carries the gene, not offered · 0

None.

Provenance

Claims bound to immutable artifacts. An attestation is not a promise that the change is good — it is a signed statement about how it was produced, read here as SLSA, in-toto, CycloneDX pedigree and W3C PROV triples.

Signatures are not re-checked in this browser. Verified means the seed data says the signature checked at ingest.

Not attested

inferred from attestations
  1. None — current claim
  2. L1 — not claimed
  3. L2 — not claimed

No SLSA provenance is on record. Inventory documents (CycloneDX, SPDX) describe what is in the tree; they do not describe how it was built.

Next rung: A slsa-provenance or github-artifact-attestation attestation, verified at ingest, is the first rung.

No SLSA provenance on this record.

Decision

A decision is itself a record: attributable, reasoned and signed. Choose one to see what would be written on behalf of KEYLIT Accessibility.

Adopt is unavailable: one gate has not been cleared — maintainer approval. A mutation does not propagate on an assertion, so the gate is a block rather than a warning.

This record describes a proposed change to a capability, not a merge. Adoption is per-genome and reversible, the fitness figures come from the seeded sandbox runs above rather than from a live measurement, and no number on this page is an aggregate quality score.