Add JustLend DAO Lending skill

[M2M-TRC8004-Registry]

Summary

• Adds justlend-skill for supplying and borrowing assets on JustLend DAO (TRON's largest lending protocol)
• Browse lending markets with APY rates
• View lending positions and health factor
• Supply and withdraw assets
• Borrow and repay loans

Scripts

• markets.js — Browse available lending markets
• position.js — View lending positions and health
• supply.js — Supply assets to earn interest
• withdraw.js — Withdraw supplied assets
• borrow.js — Borrow against collateral
• repay.js — Repay borrowed assets

Source: https://github.com/M2M-TRC8004-Registry/justlend-skill

[boboliu-1010]

Thank you for this comprehensive JustLend integration! Lending and borrowing capabilities are foundational for maximizing an agent's capital efficiency, and we have this PR on our radar.

We are currently establishing whitelisting mechanisms and security standards for core capabilities, so the merge of this large-scale DeFi Skill will be postponed.

Since lending inherently carries liquidation risks, to meet our merge criteria, we highly recommend adding monitoring logic for the Health Factor. For example: How does the agent estimate the new health factor before borrowing? How can we set a safety threshold (e.g., 1.2) to prevent risky borrowing behaviors?

[M2M-TRC8004-Registry]

Updated to address review feedback:

• Health Factor config: Added health_factor.min_threshold (default 1.2) and warn_threshold (default 1.5) in justlend_contracts.json
• Pre-borrow estimation: borrow.js now calls estimateHealthFactorAfterBorrow() using on-chain oracle prices to project the post-borrow health factor before executing
• Borrow safeguard: Transactions are blocked if estimated health factor would drop below min_threshold; warnings emitted below warn_threshold
• Position monitoring: position.js now includes health_factor in output with critical/warning alerts
• Oracle integration: Added price_oracle address and getUnderlyingPrice ABI for USD valuation of borrows across all markets

[boboliu-1010]

Thanks for the update. I re-checked the latest head after your comment.

I still see one blocking issue before approval: the supported market table in SKILL.md still does not match the jToken addresses in justlend_contracts.json. Please update the documentation so the published addresses match the actual config used by the scripts.

[boboliu-1010]

I was able to install this PR locally, but I could not validate the write-path in our current Nile QA setup.

dry-run for supply.js fails immediately with:

Unknown asset "TRX". Available:

After checking resources/justlend_contracts.json, this skill currently appears to define markets only for mainnet, with no nile configuration.

Please clarify the intended scope:

• If this skill is meant to support Nile QA, it needs a Nile market/config mapping.
• If it is mainnet-only, that should be stated explicitly in the README / SKILL.md so QA does not try to validate it against Nile.

[M2M-TRC8004-Registry]

I would have added testnet support, but I wasn't able to find any deployments on testnet

[boboliu-1010]

Static review found two blocking issues:

• repay.js mishandles TRX all: the script maps all to MAX_UINT256, but in the native TRX branch it then sends callValue: 0, so node scripts/repay.js TRX all submits a transaction that does not repay the outstanding borrow.
• borrow.js estimates health factor before processing the optional --collateral market entry. That means a borrow can be rejected based on the pre-entry state even when the user explicitly asked to enable collateral first. The safeguard needs to reflect the post-entry state, or the collateral entry has to happen before the estimate.