build_approve_token · CSPR[dot]trade MCP: Risk & Policy

WHAT IT DOES

What build_approve_token does on CSPR[dot]trade MCP

AI agents invoke build_approve_token to trigger actions in CSPR[dot]trade MCP. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why build_approve_token needs a policy

This tool constructs a token approval transaction, which authorizes a spender (the CSPR.trade router) to transfer tokens on the user's behalf. While it builds an 'unsigned' transaction (suggesting it doesn't submit it), approvals on-chain enable subsequent operations that could drain tokens. This is an Execute-level action as it triggers an external blockchain operation. It could lead to financial harm if misused (e.

From the tool's definition Build an unsigned token approval transaction. Spender defaults to the CSPR.trade router.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

build_approve_token Rate-limited

build_approve_token stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "build_approve_token": {
      "limits": [
        {
          "counter": "build_approve_token_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about build_approve_token

What does the build_approve_token tool do? +

Build an unsigned token approval transaction. Spender defaults to the CSPR.trade router. It is categorised as a Execute tool in the CSPR[dot]trade MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on build_approve_token? +

Register the CSPR[dot]trade MCP server in PolicyLayer and add a rule for build_approve_token: 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 CSPR[dot]trade MCP. Nothing to install.

What risk level is build_approve_token? +

build_approve_token is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit build_approve_token? +

Yes. Add a rate_limit block to the build_approve_token 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 build_approve_token completely? +

Set action: deny in the PolicyLayer policy for build_approve_token. 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 build_approve_token? +

build_approve_token is provided by the CSPR[dot]trade MCP server (make-software/cspr-trade-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.