halo2
Skills for building and debugging PLONK circuits with halo2_proofs (zcash/halo2)
Resources
2Install
npx skillscat add hairyf/blockchain-skills/halo2 Install via the SkillsCat registry.
SKILL.md
The skill is based on halo2 (halo2_proofs) at the version recorded in GENERATION.md, generated at 2026-02-24.
halo2 is a Rust library for building PLONK-based zero-knowledge proofs. The main crates are halo2_proofs (circuit API, keygen, prover, verifier) and halo2_gadgets (reusable gadgets). This skill focuses on agent-oriented usage: defining circuits, configuring constraints, assigning witnesses, and debugging with the mock prover.
Core References
| Topic | Description | Reference |
|---|---|---|
| Circuit API | Circuit trait, configure, synthesize, FloorPlanner | core-circuit-api |
| Constraint system | Columns, gates, equality, lookups | core-constraint-system |
| Chip and region | Chip trait, Region, Layouter, assign_region, copy_advice | core-chip-and-region |
| Columns and values | Column types, Value, Assigned, AssignedCell, Rotation | core-columns-and-values |
Features
| Topic | Description | Reference |
|---|---|---|
| Lookup tables | Lookup argument, TableColumn, TableLayouter | features-lookup-tables |
| Keygen, prover, verifier | Params, keygen_vk/keygen_pk, create_proof, verify_proof | features-keygen-prover-verifier |
| Mock prover | MockProver::run, verify(), VerifyFailure | features-mock-prover |
| Parallelism | RAYON_NUM_THREADS, multicore feature | features-parallelism |
Best practices
| Topic | Description | Reference |
|---|---|---|
| Floor planning | SimpleFloorPlanner, choosing k, regions | best-practices-floor-planning |
Categories
Install
npx skillscat add hairyf/blockchain-skills/halo2 Install via the SkillsCat registry.