# enter_market

Enable a jToken market as collateral. Required before borrowing against supplied assets.

Agent View of the PolicyLayer registry record for `enter_market`. HTML page: https://policylayer.com/tools/justlend-mcp-server-justlend/enter-market

## Facts

- Tool: `enter_market`
- Server: Justlend (`justlend/mcp-server-justlend`) — https://policylayer.com/tools/justlend-mcp-server-justlend.md
- Homepage: https://github.com/justlend/mcp-server-justlend
- Risk category: Write (Medium risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Rate-limited

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "enter_market",
    "arguments": {}
  }
}
```

## Why enter_market is rated Medium

This tool modifies the user's account state on JustLend by enabling a market as collateral. It is a reversible configuration change (markets can typically be exited), so it falls under Write rather than Execute or Destructive. However, misuse could indirectly enable borrowing against assets, increasing financial risk exposure, hence medium severity.

From the tool's own definition: "Enable a jToken market as collateral. Required before borrowing against supplied assets."

## Use case

AI agents use enter_market to create or update resources in Justlend, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Justlend environment.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Justlend:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "enter_market": {
      "limits": [
        {
          "counter": "enter_market_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Justlend (103)

- `return_energy_rental` — Destructive — https://policylayer.com/tools/justlend-mcp-server-justlend/return-energy-rental.md
- `buy_energy_direct` — Financial — https://policylayer.com/tools/justlend-mcp-server-justlend/buy-energy-direct.md
- `claim_rewards` — Financial — https://policylayer.com/tools/justlend-mcp-server-justlend/claim-rewards.md
- `claim_strx_rewards` — Financial — https://policylayer.com/tools/justlend-mcp-server-justlend/claim-strx-rewards.md
- `deposit_jst_for_votes` — Financial — https://policylayer.com/tools/justlend-mcp-server-justlend/deposit-jst-for-votes.md
- `moolah_borrow` — Financial — https://policylayer.com/tools/justlend-mcp-server-justlend/moolah-borrow.md
- `moolah_liquidate` — Financial — https://policylayer.com/tools/justlend-mcp-server-justlend/moolah-liquidate.md
- `moolah_repay` — Financial — https://policylayer.com/tools/justlend-mcp-server-justlend/moolah-repay.md
- `moolah_supply_collateral` — Financial — https://policylayer.com/tools/justlend-mcp-server-justlend/moolah-supply-collateral.md
- `moolah_vault_deposit` — Financial — https://policylayer.com/tools/justlend-mcp-server-justlend/moolah-vault-deposit.md
- `moolah_vault_withdraw` — Financial — https://policylayer.com/tools/justlend-mcp-server-justlend/moolah-vault-withdraw.md
- `moolah_withdraw_collateral` — Financial — https://policylayer.com/tools/justlend-mcp-server-justlend/moolah-withdraw-collateral.md
- `rent_energy` — Financial — https://policylayer.com/tools/justlend-mcp-server-justlend/rent-energy.md
- `repay` — Financial — https://policylayer.com/tools/justlend-mcp-server-justlend/repay.md
- `supply` — Financial — https://policylayer.com/tools/justlend-mcp-server-justlend/supply.md
- `transfer_trc20` — Financial — https://policylayer.com/tools/justlend-mcp-server-justlend/transfer-trc20.md
- `transfer_trx` — Financial — https://policylayer.com/tools/justlend-mcp-server-justlend/transfer-trx.md
- `withdraw` — Financial — https://policylayer.com/tools/justlend-mcp-server-justlend/withdraw.md
- `withdraw_all` — Financial — https://policylayer.com/tools/justlend-mcp-server-justlend/withdraw-all.md
- `withdraw_votes_from_proposal` — Financial — https://policylayer.com/tools/justlend-mcp-server-justlend/withdraw-votes-from-proposal.md
- `withdraw_votes_to_jst` — Financial — https://policylayer.com/tools/justlend-mcp-server-justlend/withdraw-votes-to-jst.md
- `wrap_trx` — Financial — https://policylayer.com/tools/justlend-mcp-server-justlend/wrap-trx.md
- `borrow` — Read — https://policylayer.com/tools/justlend-mcp-server-justlend/borrow.md
- `calculate_energy_rental_price` — Read — https://policylayer.com/tools/justlend-mcp-server-justlend/calculate-energy-rental-price.md
- `check_allowance` — Read — https://policylayer.com/tools/justlend-mcp-server-justlend/check-allowance.md
- `check_jst_allowance_for_voting` — Read — https://policylayer.com/tools/justlend-mcp-server-justlend/check-jst-allowance-for-voting.md
- `check_strx_withdrawal_eligibility` — Read — https://policylayer.com/tools/justlend-mcp-server-justlend/check-strx-withdrawal-eligibility.md
- `claim_moolah_mining_period` — Read — https://policylayer.com/tools/justlend-mcp-server-justlend/claim-moolah-mining-period.md
- `claim_v1_mining_period` — Read — https://policylayer.com/tools/justlend-mcp-server-justlend/claim-v1-mining-period.md
- `estimate_lending_energy` — Read — https://policylayer.com/tools/justlend-mcp-server-justlend/estimate-lending-energy.md
- …and 73 more: https://policylayer.com/tools/justlend-mcp-server-justlend.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=justlend-mcp-server-justlend · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/justlend-mcp-server-justlend