sync_budget · Actual Budget MCP Server MCP: Risk & Policy

WHAT IT DOES

What sync_budget does on Actual Budget MCP Server

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

WHY IT NEEDS A POLICY

Why sync_budget needs a policy

Sync operations push local changes to a remote server, which is a write/update action. It does not delete data or move money directly, but it commits pending changes to the server. The description is somewhat vague about what 'changes' are synced, which slightly lowers confidence, but the core action is persisting/writing data remotely.

From the tool's definition Synchronize the budget with the server. Use this after making changes to ensure data is saved.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

sync_budget Rate-limited

sync_budget 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": {
    "sync_budget": {
      "limits": [
        {
          "counter": "sync_budget_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 Actual Budget MCP Server, so you can run agents against it safely.

FAQ

Questions about sync_budget

What does the sync_budget tool do? +

Synchronize the budget with the server. Use this after making changes to ensure data is saved. It is categorised as a Write tool in the Actual Budget MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on sync_budget? +

Register the Actual Budget MCP Server MCP server in PolicyLayer and add a rule for sync_budget: 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 Actual Budget MCP Server. Nothing to install.

What risk level is sync_budget? +

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

Can I rate-limit sync_budget? +

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

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

sync_budget is provided by the Actual Budget MCP Server MCP server (yhc0712/actual-budget-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.