Set or update the buyer's trade-in vehicle information. Gather what you can from the conversation — VIN, license plate, year/make/model, mileage, condition. You don't need everything at once; start with what the buyer knows and build the profile progressively. The dealer will make the trade-in of...
Risk signalsHigh parameter count (19 properties) · Bulk/mass operation — affects multiple targets
Part of the Marketplace server.
Free to start. No card required.
AI agents invoke cars_session_tradein to trigger processes or run actions in Marketplace. 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.
cars_session_tradein 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": {
"cars_session_tradein": {
"limits": [
{
"counter": "cars_session_tradein_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}See the full Marketplace policy for all 19 tools.
These attack patterns abuse exactly the kind of access cars_session_tradein 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.
Set or update the buyer's trade-in vehicle information. Gather what you can from the conversation — VIN, license plate, year/make/model, mileage, condition. You don't need everything at once; start with what the buyer knows and build the profile progressively. The dealer will make the trade-in offer based on this info. Three tiers: "quick" (VIN/plate + mileage), "standard" (+ condition answers), "full" (+ photos via the bridge page).. It is categorised as a Execute tool in the Marketplace MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Marketplace MCP server in PolicyLayer and add a rule for cars_session_tradein: 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 Marketplace. Nothing to install.
cars_session_tradein 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 cars_session_tradein 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 cars_session_tradein. 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.
cars_session_tradein is provided by the Marketplace MCP server (https://cars.rootz.global/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 19 Marketplace tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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