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f-star-effectful-verification

Use when effectful, security-sensitive code needs refinement-typed, SMT-backed verification in F*, in the HACL* or Project Everest style.

.devin/skills/f-star-effectful-verification/SKILL.md

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Nov 4, 2026

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Sep 28, 2026
License
Apache-2.0

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# Effectful verification in F*

## Contract

| Field | Bound contract |
|---|---|
| Trigger | The task is to verify effectful code with F* refinement types and the effect system, with obligations discharged to SMT, in the HACL* or Project Everest style. Methodology stays with proof-driven. |
| Authority | Reversible local: writes only F* source and interface files, extraction configuration, and project build files inside the target project; rollback is version control. No remote mutation. |
| Side effect | Local writes to `.fst` and `.fsti` files and to build or extraction configuration. No remote mutation. |
| Done | `fstar.exe` verifies the module with `admit_smt_queries` at its default false, the `assume val` ledger names every trust boundary, and extraction runs for the chosen codegen target. |

## Inputs

- F* release v2026.08.30 (dated releases ship weekly), installed with `opam install fstar` or fetched as the dated binary release. The binary package ships `bin/fstar.exe` and its own Z3; a source install must supply Z3.