append_file_text

A write tool on the Mapi Agent Memory MCP server.

SERVERMapi Agent Memory SOURCEcabo0m/mapi-agent-memory

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/mapi-agent-memory/append-file-text.md

WHAT IT DOES

What append_file_text does on Mapi Agent Memory

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

RISK

Why append_file_text is rated Medium

The name 'append_file_text' strongly implies writing data to a file by appending content. This is a Write operation as appending is generally reversible (the appended content can be removed). However, the empty description lowers confidence significantly. Severity is high because in an AI agent memory/governance context, appending arbitrary text to files could corrupt memory state or governance records.

From the tool's definition Tool name 'append_file_text' suggests appending text to a file, which is a write operation. Description is empty and uninformative.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs append_file_text safely

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

append_file_text Rate-limited

append_file_text 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": {
    "append_file_text": {
      "limits": [
        {
          "counter": "append_file_text_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 Mapi Agent Memory, apply this rule, and every append_file_text call is checked against it from then on.

FAQ

Questions about append_file_text

What does the append_file_text tool do? +

append_file_text is a write tool on the Mapi Agent Memory MCP server. It is categorised as a Write tool in the Mapi Agent Memory MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on append_file_text? +

Register the Mapi Agent Memory MCP server in PolicyLayer and add a rule for append_file_text: 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 Mapi Agent Memory. Nothing to install.

What risk level is append_file_text? +

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

Can I rate-limit append_file_text? +

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

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

append_file_text is provided by the Mapi Agent Memory MCP server (cabo0m/mapi-agent-memory). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on Mapi Agent Memory, and thousands of servers like it.

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write_file on 0sec → The MCP Attack Database →

Guides

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