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flare-fcc

Explain FCC TEE extension lifecycle, registries, and attestation workflows.

19|5|Updated Feb 12, 2026
Search Tags:#extension-patterns#attestation#tee#fcc#on-chain-registry#confidential-compute#instruction-sender
One-click install
npx skills add https://github.com/flare-foundation/flare-ai-skills --skill flare-fcc
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: flare-fcc
Source: https://github.com/flare-foundation/flare-ai-skills/tree/main/skills/flare-fcc-skill
Command: npx skills add https://github.com/flare-foundation/flare-ai-skills --skill flare-fcc

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Flare Confidential Compute (FCC) enables running code inside Trusted Execution Environments (TEEs) and ties that code to on-chain contracts. This Skill provides domain knowledge and guidance for FCC and TEE extensions—how confidential extensions run inside a TEE, the on-chain TeeExtensionRegistry and TeeMachineRegistry, the InstructionSender contract pattern, the OPType/OPCommand routing model, the instruction lifecycle, the extension action handler, the types server, attestation, and reproducible builds. Use when building, deploying, or reasoning about Flare confidential extensions, including the fce-extension-scaffold, the fce-sign signing example, Confidential Space VMs, code-hash attestation, or registering a TEE on Coston/Coston2.

Core Features & Use Cases

  • Understanding FCC architecture: TEEs, registries, and extension patterns.
  • Designing and deploying confidential extensions with InstructionSender, routing, and attestation.
  • Use Case: Build a TEE extension that handles secure off-chain computations and attested results.

Quick Start

Review the FCC extension scaffold and set up a local environment to explore the extension lifecycle.

Frequently Asked Questions about flare-fcc

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do TEE attestation and on-chain registries work in Flare Confidential Compute?▼

Flare Confidential Compute attestation verifies TEE code integrity, while on-chain TeeExtensionRegistry and TeeMachineRegistry securely map confidential extensions to their verified machines on Coston or Coston2.

How do I build and deploy a confidential compute extension using the FCC scaffold?▼

Build a confidential compute extension by reviewing the fce-extension-scaffold, implementing the InstructionSender pattern, and configuring OPType routing to deploy attested TEE code on Coston or Coston2.

What is the InstructionSender contract pattern and how does it route instructions?▼

The InstructionSender pattern routes on-chain commands to confidential TEE extensions using the OPType and OPCommand routing model, managing the full instruction lifecycle from contract to execution.

Do I need reproducible builds for TEE attestation on Flare?▼

Reproducible builds are required for Flare TEE attestation to ensure the deployed Confidential Space VM code hash exactly matches the hash registered and verified in the on-chain TeeExtensionRegistry.

Can I use Confidential Space VMs with the Flare extension lifecycle?▼

Confidential Space VMs integrate with the Flare extension lifecycle by running confidential computations inside a TEE, generating attested results verified through code-hash attestation and on-chain registries.

What are the limitations of relying on TEE attestation for confidential compute extensions?▼

TEE attestation limitations include strict reproducible build requirements and dependency on Confidential Space VMs, meaning any code hash mismatch between build and deployment environments fails on-chain verification.

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