Use when working on Solidity files importing @fhenixprotocol/cofhe-contracts/FHE.sol or fhenix-confidential-contracts, or using euint*/ebool/eaddress types. Teaches confidential contract patterns — branchless updates with FHE.select, the four ACL verbs, the two decryption flows, and the confidential-token standards picker. Activates on Fhenix CoFHE contract work.
Use when working with @cofhe/sdk in TypeScript — encrypting inputs, managing permits, choosing decrypt modes (decryptForView vs decryptForTx), or wiring CoFHE into a Next.js / wagmi / viem dApp. Activates on imports of @cofhe/sdk or its subpaths, on hooks named useCofhe* or usePermit*, and on prompts like "encrypt this input" or "set up cofhe in Next.js."
Use when auditing or reviewing confidential code for Fhenix CoFHE — both on-chain (FHE.sol) and off-chain (@cofhe/sdk). Catches ACL bugs, decrypt-flow mismatches, plaintext leaks, confidentiality-vs-anonymity confusion, and the 30+ recurring gotchas in this catalog. Activates only in review/audit contexts — PR diffs, `gh pr view` output, or prompts like "audit this", "review this", "is this safe", "security check", "look over my FHE code".
Use when writing or extending tests for confidential CoFHE code — Foundry mocks, Hardhat plugin, encrypted input fixtures, SDK decrypt flows (decryptForView and decryptForTx) in tests. Activates on .test.ts / .t.sol files importing FHE.sol, @cofhe/sdk, @cofhe/hardhat-plugin, or @fhenixprotocol/cofhe-mock-contracts; on files under tests/contracts/; or on prompts like "test this confidential contract."