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vcsdd-verification-architecture

Use this skill when writing Phase 1b verification architecture documents. Provides purity boundary mapping, proof obligation design, and tier assignment guidance.

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VCSDD Verification Architecture

When to Activate

  • Phase 1b (verification architecture)
  • Designing proof obligations for a feature
  • Reviewing purity boundaries

Purity Boundary Design

Identifying the Pure Core

A function belongs in the pure core if:

  • Same input ALWAYS produces same output (no randomness, no time, no state)
  • No I/O operations (no file reads, network calls, DB queries)
  • No mutations to shared state
  • Can be tested without mocks

Identifying the Effectful Shell

A function belongs in the effectful shell if:

  • It reads from external sources (files, DB, APIs)
  • It writes to external sinks
  • It uses system time or randomness
  • It coordinates side effects

Architecture Pattern

+---------------------------------+
|         Effectful Shell         |
|  (HTTP handlers, DB adapters)   |
|                                 |
|    +---------------------+      |
|    |     Pure Core       |      |
|    |  (business rules,   |      |
|    |   parsing, calcs)   |      |
|    +---------------------+      |
+---------------------------------+

Proof Obligation Design

Each proof obligation should specify:

  • What property is being proved
  • Which verification tier is appropriate
  • Whether it is required for Phase 6 convergence

Good proof obligations:

  • PROP-001: Parse(Serialize(x)) == x (round-trip property)
  • PROP-002: Validate(x) == false implies Transform(x) raises an error
  • PROP-003: Token budget never goes negative

Poor proof obligations (too vague):

  • PROP-004: Code is correct
  • PROP-005: No errors occur

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