# Core Functionality

The **Core Functionality** of Term Strategy Vaults combines the robust, battle-tested foundation of Yearn V3's ERC-4626 implementation with custom integrations and risk management mechanisms tailored to Term's fixed-rate lending protocol. This hybrid design ensures both seamless compatibility with DeFi standards and specialized functionality for managing Term’s unique portfolio requirements.

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**YearnV3 Base Operations**

The **Yearn V3** foundation provides the essential scaffolding for Term Strategy Vaults. By implementing the ERC-4626 standard, Yearn V3 ensures standardized asset operations, including deposits, withdrawals, and share accounting. Key features include:

* **Asset Operations**: Efficient handling of deposits, withdrawals, and liquidity deployment via hooks like `_deployFunds` and `_freeFunds`.
* **Profit Mechanics**: Smooth profit realization and linear unlocking to prevent manipulation of price-per-share (PPS).
* **Fee Management**: Transparent performance fee distribution between curators and Yearn governance.
* **Security Enhancements**: Reentrancy protections, sandwich attack prevention, and robust access controls.

This foundational layer provides Term Strategy Vaults with a secure, modular, and efficient vault structure for managing assets.

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**Term Protocol Operations**

Building on the Yearn V3 foundation, the **Term-specific functionality** introduces custom integrations to manage fixed-rate lending portfolios effectively. These include:

1. **Liquidity Management**:
   * Automated portfolio adjustments using Term-specific hooks like `_harvestAndReport`.
   * Comprehensive valuation of repoToken holdings, idle liquidity, and pending auction offers.
2. **Auction Participation**:
   * Controlled submission of auction offers by the designated manager.
   * Real-time validation of repoToken and auction parameters to maintain portfolio integrity.
3. **Direct Repo Token Liquidity**:
   * Public interface for selling repoTokens into the vault, ensuring efficient liquidity management.
   * Validation and enforcement of portfolio constraints during token purchases.
4. **Risk Management**:
   * Strict enforcement of portfolio constraints, including:
     * Concentration limits.
     * Liquid reserve requirements.
     * Weighted average duration caps.
     * Collateral quality checks.
   * Continuous monitoring of portfolio health through automated processes.

The Term layer transforms Yearn's flexible vault structure into a specialized solution for managing Term’s fixed-rate lending portfolios while adhering to stringent risk controls.