Returns the current USD price for one or more tokens by reading Chainlink on-chain price feed contracts directly — the same oracles that Aave, Morpho, Spark, and Compound use to trigger liquidations. Use this for portfolio valuation, P&L calculation, health-factor estimation, and policy enforceme...
Part of the Syenite server.
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AI agents invoke token.price to trigger processes or run actions in Syenite. Execute operations can have side effects beyond the immediate call -- triggering builds, sending notifications, or starting workflows. Rate limits and argument validation are essential to prevent runaway execution.
token.price can trigger processes with real-world consequences. An uncontrolled agent might start dozens of builds, send mass notifications, or kick off expensive compute jobs. PolicyLayer enforces rate limits and validates arguments to keep execution within safe bounds.
Execute tools trigger processes. Rate-limit and validate arguments to prevent unintended side effects.
{
"version": "1",
"default": "deny",
"tools": {
"token.price": {
"limits": [
{
"counter": "token.price_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}See the full Syenite policy for all 46 tools.
These attack patterns abuse exactly the kind of access token.price gives an agent. Each links to the full case and the policy that stops it:
Other execute tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Returns the current USD price for one or more tokens by reading Chainlink on-chain price feed contracts directly — the same oracles that Aave, Morpho, Spark, and Compound use to trigger liquidations. Use this for portfolio valuation, P&L calculation, health-factor estimation, and policy enforcement where prices must match what lending protocols see. Pass symbol for a single token or symbols (array, max 20) for a batch lookup; results are cached for 60 seconds. Supported tokens: wBTC, tBTC, cbBTC, WETH, wstETH, rETH, cbETH, weETH, USDC, USDT, DAI, GHO, sDAI. Returns priceUSD and the feed contract address per token; unsupported symbols return an error entry without aborting the batch.. It is categorised as a Execute tool in the Syenite MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Syenite MCP server in PolicyLayer and add a rule for token.price: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Syenite. Nothing to install.
token.price is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the token.price rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for token.price. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
token.price is provided by the Syenite MCP server (@syenite/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 46 Syenite tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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