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writing-isabelle-proofs

Use when a proof needs Isabelle/HOL, its Sledgehammer automation, or an AFP session. Not for Lean 4: use writing-lean-proofs.

.devin/skills/writing-isabelle-proofs/SKILL.md

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Last checked
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Repository last updated
Sep 28, 2026
License
Apache-2.0

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# Writing Isabelle proofs

## Contract

| Field | Bound contract |
|---|---|
| Trigger | The task is to write, review, or maintain Isabelle/HOL proofs, to drive Sledgehammer against a goal, or to build on an AFP entry. Methodology stays with proof-driven. |
| Authority | Reversible local: writes only theory files, session ROOT files, and Isabelle configuration inside the target project; rollback is version control. No remote mutation. |
| Side effect | Local writes to `.thy` sources, ROOT session definitions, and the AFP checkout already on disk. No remote mutation. |
| Done | `isabelle build` of the session succeeds, no `sorry` remains, and no `axiomatization` enters the delivered diff. |

## Inputs

- Isabelle2025-2, made available January 2026. Install the platform bundle from isabelle.in.tum.de: `Isabelle2025-2_linux.tar.gz`, `Isabelle2025-2_linux_arm.tar.gz`, `Isabelle2025-2.exe` for Windows, or `Isabelle2025-2_macos.tar.gz`. There is no LTS, so pin the bundle version.