Port Verify — act101 Agent Skill

Port Verify

Gate a cross-language port for correctness — composes port-scoped behavioral equivalence, contract parity, and port-manifest drift into a port-correctness verdict. Use to verify that a ported function matches its source before marking the port done.

port-verify

A port-correctness gate: confirm a ported function behaves like its source and that the port manifest is not drifting. Composes two Enterprise verification ops with the port inventory.

Honesty caveat (read first)

This is a structural/contract comparison (v1), not execution-based differential testing. verify_port_parity and verify_behavioral_equivalence (scope=port) compare only dimensions BOTH grammars model — a dimension modeled by one side only is reported unknown, never falsely preserved/diverged. Each result carries modeled_kinds; an empty set for either grammar means that dimension is uncovered. Per-grammar degradation across the source/target language pair is the norm — name both languages and the uncovered dimensions. Verdicts are advisory.

Tier

Enterprise. verify_behavioral_equivalence at scope:"port", verify_port_parity, and the port_* manifest/inventory tools are all Enterprise and enforce the tier themselves.

Tools (in order)

Step	Tool	What it answers
1	`verify_behavioral_equivalence` (`scope:"port"`)	Do the source and ported functions have an equivalent control-flow shape under cross-language normalization?
2	`verify_port_parity`	Do signature arity, return presence, effect-kind set, CFG shape, and raise count match across the language pair?
3	`port_inventory`	Is the manifest consistent — is this symbol marked ported, and is the target verified? Surfaces drift.

Workflow

Call verify_behavioral_equivalence with scope:"port", the source target/file and the ported version (via before/after or the manifest mapping). equivalent confirms shape held; changed lists which dimensions diverged; unknown means a dimension could not be normalized across the pair — do not claim parity on it.
Call verify_port_parity with source_file/source_target and ported_file/ported_target. Read the verdict (preserved/diverged/ unknown), the dimensions_checked, and every mismatch. A diverged dimension is a hard gate failure.
Call port_inventory to check manifest state for the file: is it marked ported, are ported/stubbed symbols recorded, does target verification pass? A symbol that is structurally equivalent but absent/stubbed in the manifest is drift — the manifest and reality disagree.

Verdict synthesis

PORT VERIFIED — equivalent (port scope) AND parity preserved with ≥1 jointly-modeled dimension AND the manifest marks the symbol ported with a verified target.
PORT DIVERGED — equivalence changed or parity diverged on any modeled dimension; report the exact dimension and the mismatch.
MANIFEST DRIFT — structurally equivalent but the manifest disagrees (unrecorded, stubbed, or unverified target).
UNKNOWN — either op returned unknown/empty modeled_kinds on a dimension; name the source+target languages and the uncovered dimension. Never present UNKNOWN as VERIFIED.

Output

Per ported symbol: the equivalence result, the parity verdict with dimensions_checked + mismatches, the manifest status, and the gate verdict. Quote modeled_kinds for both languages on any UNKNOWN.