What Claude Sonnet 5 gets wrong about prisma — battery v6-a, tested 2026-09-12

F1 · Ships the graduated preview flags as the mechanism that switches on the Rust-free client

S3deprecated · previewFeatures = ["driverAdapters"] · added · changed in prisma 6.16.0 (2025-09-10) · chargeable

SEVERITY: S3 BY THE PRE-REGISTERED FUNCTION, AND THE S2 CLAUSE WAS CONSIDERED AND REFUSED. prompts/prisma.md §v6 fixes the severity function before the draw: S3 for "a preview flag said to be required", which this is verbatim; S2 for an arm that additionally asserts the line changes what RUNS, a clause the pre-registration writes about engineType specifically. This arm does assert the flags change what runs ("the flag that actually replaces the Rust query engine"), so the S2 clause fits in spirit — and extending a clause from the key it names to a different key AFTER reading the transcript is the decision pre-registration exists to prevent. It is scored S3 and the reasoning is published here rather than the score being quietly raised. The clause should be rewritten for the surface, not for this arm; queued in BACKLOG. DOUBLE-CHARGE CHECK: this is the LF38 belief, not LF39's — the arm writes no engineType anywhere in the battery and tells its colleague to delete the one TASK 3 shows it. The corpus's two existing engineType findings (prisma/sonnet-5 F10, prisma/fable-5 F9) carry LF14's belief and are untouched. LF38 had no charged finding in the corpus before this one.

generator client {
  provider        = "prisma-client"
  output          = "../src/generated/prisma"
  previewFeatures = ["queryCompiler", "driverAdapters"]
}

generator client {
  provider = "prisma-client"
  output   = "../src/generated/prisma"
}