# get_vault_balance

Get the underlying token breakdown and balance data for an ATV vault from the Aarna engine database.

Agent View of the PolicyLayer registry record for `get_vault_balance`. HTML page: https://policylayer.com/tools/aarna-ai-atv/get-vault-balance

## Facts

- Tool: `get_vault_balance`
- Server: Atv (`aarna-ai/atv`) — https://policylayer.com/tools/aarna-ai-atv.md
- Homepage: https://github.com/aarna-ai/atv
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 1
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `address` | string | no | Vault contract address |

Parameters from the server's own tool schema.

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

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

## Why get_vault_balance is rated Low

This tool retrieves vault balance and token composition information from a database. It performs a read-only query operation with no capability to modify, delete, or execute actions. The verb 'Get' and the absence of any modifying language (create, update, delete, transfer, etc.) confirm this is a Read category tool.

From the tool's own definition: "Tool name 'get_vault_balance' and description 'Get the underlying token breakdown and balance data' indicate retrieval of data with no modification or side effects."

## Use case

AI agents call get_vault_balance to retrieve information from Atv without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

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

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_vault_balance": {}
  }
}
```

## Other tools on Atv (18)

- `build_deposit_tx` — Execute — https://policylayer.com/tools/aarna-ai-atv/build-deposit-tx.md
- `build_queue_withdraw_tx` — Execute — https://policylayer.com/tools/aarna-ai-atv/build-queue-withdraw-tx.md
- `build_stake_tx` — Execute — https://policylayer.com/tools/aarna-ai-atv/build-stake-tx.md
- `build_unqueue_withdraw_tx` — Execute — https://policylayer.com/tools/aarna-ai-atv/build-unqueue-withdraw-tx.md
- `build_unstake_tx` — Execute — https://policylayer.com/tools/aarna-ai-atv/build-unstake-tx.md
- `build_redeem_withdraw_tx` — Financial — https://policylayer.com/tools/aarna-ai-atv/build-redeem-withdraw-tx.md
- `build_withdraw_tx` — Financial — https://policylayer.com/tools/aarna-ai-atv/build-withdraw-tx.md
- `get_deposit_status` — Read — https://policylayer.com/tools/aarna-ai-atv/get-deposit-status.md
- `get_historical_nav` — Read — https://policylayer.com/tools/aarna-ai-atv/get-historical-nav.md
- `get_queue_withdraw_status` — Read — https://policylayer.com/tools/aarna-ai-atv/get-queue-withdraw-status.md
- `get_total_tvl` — Read — https://policylayer.com/tools/aarna-ai-atv/get-total-tvl.md
- `get_user_investments` — Read — https://policylayer.com/tools/aarna-ai-atv/get-user-investments.md
- `get_vault` — Read — https://policylayer.com/tools/aarna-ai-atv/get-vault.md
- `get_vault_apy` — Read — https://policylayer.com/tools/aarna-ai-atv/get-vault-apy.md
- `get_vault_nav` — Read — https://policylayer.com/tools/aarna-ai-atv/get-vault-nav.md
- `get_vault_tvl` — Read — https://policylayer.com/tools/aarna-ai-atv/get-vault-tvl.md
- `get_withdraw_status` — Read — https://policylayer.com/tools/aarna-ai-atv/get-withdraw-status.md
- `list_vaults` — Read — https://policylayer.com/tools/aarna-ai-atv/list-vaults.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=aarna-ai-atv · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/aarna-ai-atv