actual_transactions_update

Update an existing transaction in Actual Budget. Provide the transaction ID and the fields you want to update.

SERVERActual SOURCEactual-mcp-server

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/actual/actual-transactions-update.md

WHAT IT DOES

What actual_transactions_update does on Actual

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

RISK

Why actual_transactions_update is rated Medium

The tool creates or modifies financial data (transactions) in a reversible manner. While it operates on financial records, it does not move money or commit financial obligations directly—it updates transaction metadata/records. This makes it Write rather than Financial.

From the tool's definition Tool name contains 'update' and description states 'Update an existing transaction in Actual Budget.' This modifies financial transaction data reversibly.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs actual_transactions_update safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Actual, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For actual_transactions_update, this is the rule to start with:

actual_transactions_update Rate-limited

actual_transactions_update 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": {
    "actual_transactions_update": {
      "limits": [
        {
          "counter": "actual_transactions_update_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Actual, apply this rule, and every actual_transactions_update call is checked against it from then on.

FAQ

Questions about actual_transactions_update

What does the actual_transactions_update tool do? +

Update an existing transaction in Actual Budget. Provide the transaction ID and the fields you want to update. It is categorised as a Write tool in the Actual MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on actual_transactions_update? +

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

What risk level is actual_transactions_update? +

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

Can I rate-limit actual_transactions_update? +

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

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

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

KEEP EXPLORING

More on Actual, and thousands of servers like it.

This server

All 64 Actual tools →

Across the catalogue

aroflo_create_or_update_record on AroFlo MCP →team_manager_update_budget on Team Manager MCP → The MCP Attack Database →

Guides

Govern customer-ops agents →Argument validation →Scoped token →