Local correction engine
Applies mapped deterministic fixes, reparses accepted output, and returns typed outcomes.
PREFIX for Python 0.1.0
Correct what can be proven. Refuse the rest.
PREFIX for Python is prebuilt, downloadable software for deterministic local correction of a bounded set of Python 3.12 structural errors. It applies mapped corrections, validates accepted output through parse/reparse and AST checks, surfaces bounded advice without mutation, and refuses unsupported states.
PlatformsWindows x64 · Linux amd64
RuntimeCPython >=3.12,<3.13
Correction pathLocal · no cloud inference
PurchaseNo subscription
Included in 0.1.0
One license. The complete product.
This is a license to prebuilt software—not consulting, a subscription, or a custom implementation.
Made for individual Python developers who want a small, predictable correction tool in the command line or VS Code. It checks structure, not your program's business logic, and does not run your Python code.
Command-line workflow
Analyze, apply, inspect receipts, replay accepted corrections, and roll back when a receipt has a rollback-ready parse-valid pre-image.
VS Code extension
Includes the existing editor interface. Review the tested-version limits below before relying on editor corrections.
Release verification
Platform packages, wheel, VSIX, SHA-256 checksums, release manifest, and offline verifier.
Bounded correction
A small correction surface, on purpose.
PREFIX does not claim universal repair. It admits a mutation only when declared rules produce one mapped structural continuation.
if ready
print("launch")if ready:
print("launch")One mapped continuation: apply and verify. Ambiguous, unsafe, or unsupported: advise or refuse without hidden mutation.
Editor integration and declared boundary
Correction where Python is written.
The shipped VSIX invokes the installed local engine. Version 0.1.0 exposes a small, explicit command surface and does not silently expand beyond it.
Exact version 0.1.0 commands
PREFIX: Govern Active Python TransitionPREFIX: Govern Selected Python StructurePREFIX: Show Last Transition Governance Surface
A bounded correction tool—not an open-ended generator.
- A general-purpose AI coding assistant
- Arbitrary code generation
- Universal semantic repair
- A cloud inference service
Unsupported language versions, platforms, and error classes are not silently treated as compatible.
Real-product demo
See the correction—and the refusal.
Watch the 85-second Sarah-narrated commercial, then see the longer recording of actual command-line correction and refusal below.
Download the Sarah commercial (MP4)
The demo uses the qualified 0.1.0 command-line product on Windows to show a mapped missing-colon correction, parse/reparse proof, a refused unsupported state with no source change, receipt inspection, deterministic replay, and conditional rollback.
No animation or simulated output is used as evidence of product behavior.
2 minutes 14 seconds. Silent, with on-screen explanations. Recorded from the actual qualified Windows CLI, not a simulated terminal.
Open the video directlyQualified boundary
System requirements.
macOS, ARM platforms, Python 3.11, Python 3.13, Python 3.14, and later versions are not qualified for version 0.1.0.
Windows x64
Includes a bundled CPython 3.12.10 runtime and per-user installation.
The latest Windows CLI check passed. Editor correction in VS Code 1.134.0 timed out; editor use there is not verified.Linux amd64
Requires an installed CPython >=3.12,<3.13 runtime.
Retained editor evidence covers Ubuntu under WSL2 with CPython 3.12.3 and native Linux VS Code 1.85.2. The CLI can operate without VS Code.Clear retail terms
$29 USD one-time.
One named human developer may install and use PREFIX on up to two personally controlled computers for personal and commercial software-development work.
Customer-created codeRemains owned by the customer.
Product redistributionResale, sublicensing, transfer, and repackaging are not permitted.
Future commitmentsNo future version, upgrade, maintenance period, SLA, or response-time commitment is included unless stated separately in writing.
Exact customer product
The bundle identified by the existing offer.
The provider-published offer identifies PREFIX_010_CUSTOMER_DELIVERY_77d742f.zip and PREFIX_COMMERCIAL_LICENSE.md. Customer delivery and download access have not been independently verified for this update. After receiving the download, follow the installation guide included in the prepared bundle.
PREFIX for Python 0.1.0 · 77d742f
Windows x64 and Linux amd64 packages, CLI wheel, VS Code extension, instructions, checksums, manifest and offline release verifier.
Package: PREFIX_010_CUSTOMER_DELIVERY_77d742f.zip
Source: 77d742f0d764064f8ffac8a9ae2101823a4bb2c8
SHA-256: 187f3a4d4f6083f398575a39832eefb2abe65fbecd1aac9fe4dbd627a562604e
Windows, Linux and local-only correction.
The latest Windows check of the original wheel and bundled CPython 3.12.10 runtime passed all 40 CLI assertions. In the latest Windows editor test, correction in VS Code 1.134.0 timed out after five seconds; editor use on that version is not verified.
Retained Linux evidence covers Ubuntu under WSL2 with CPython 3.12.3 and native Linux VS Code 1.85.2. This is not a new bare-metal Linux test or verification of newer editor versions.
The Windows package is unsigned. No macOS, ARM, other Python versions or code-signing claim is included.
CLI receipts contain source text and paths. Keep them private. They are content-bound records, not digital signatures. Editor commands do not create CLI receipts.
Help and contact
Clear support and refund routes.
Request a refund within 14 days of purchase, subject to the refund policy and mandatory consumer rights. Private order support will use the contact shown on the purchase receipt; do not post order or payment details publicly.
Technical questionsPREFIX issue tracker (public; GitHub sign-in required). Use a non-sensitive example.
Private vulnerability reportsGitHub private reporting (GitHub sign-in required).
Contact statusContact information. The preferred private support mailbox is not yet verified; it is not advertised as a working email link.
License and policies