update_witness · Tron MCP: Risk & Policy

WHAT IT DOES

What update_witness does on Tron

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

PARAMETERS

Parameter	Type	Required	Description
`url`	string	Yes	The new official website URL for the SR
`network`	string	—	Network name. Defaults to mainnet.

Parameters from the server's own tool schema.

WHY IT NEEDS A POLICY

Why update_witness needs a policy

This tool modifies data (witness website URL) but does not delete it irreversibly, execute arbitrary code, or transfer funds. It requires the wallet to already be a Super Representative (SR), limiting blast radius to that specific account's witness metadata.

From the tool's definition Tool description states 'Update the SR node website URL' — a modification operation on blockchain state (witness/SR configuration). The tool updates an existing witness record's website URL field.

Risk signalsAccepts URL/endpoint input (url)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_witness Rate-limited

update_witness stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "update_witness": {
      "limits": [
        {
          "counter": "update_witness_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Tron, so you can run agents against it safely.

FAQ

Questions about update_witness

What does the update_witness tool do? +

Update the SR node website URL for the configured wallet (must already be an SR). It is categorised as a Write tool in the Tron MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does update_witness accept? +

update_witness accepts 2 parameters: url, network. Required: url. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on update_witness? +

Register the Tron MCP server in PolicyLayer and add a rule for update_witness: 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 Tron. Nothing to install.

What risk level is update_witness? +

update_witness is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit update_witness? +

Yes. Add a rate_limit block to the update_witness 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.

How do I block update_witness completely? +

Set action: deny in the PolicyLayer policy for update_witness. 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.

What MCP server provides update_witness? +

update_witness is provided by the Tron MCP server (@bankofai/mcp-server-tron). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.