insert_before_marker
Safely insert text before an exact marker in a text file.
This record as markdown: /tools/mapi-agent-memory/insert-before-marker.md
What insert_before_marker does on Mapi Agent Memory
AI agents use insert_before_marker 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.
Why insert_before_marker is rated Medium
This tool creates or modifies data reversibly by inserting text before a specified marker in a file. It does not delete data (not Destructive), execute code (not Execute), or involve financial operations (not Financial). The modification is reversible through standard file editing, making it a Write operation.
From the tool's definition Tool description states 'insert text' which modifies file content reversibly. Name 'insert_before_marker' indicates text insertion into an existing file.
Attacks that exploit this kind of access
The rule that runs insert_before_marker 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 insert_before_marker, this is the rule to start with:
insert_before_marker 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Mapi Agent Memory, apply this rule, and every insert_before_marker call is checked against it from then on.
Questions about insert_before_marker
Safely insert text before an exact marker in a text file. 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.
Register the Mapi Agent Memory MCP server in PolicyLayer and add a rule for insert_before_marker: 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.
insert_before_marker is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the insert_before_marker 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.
Set action: deny in the PolicyLayer policy for insert_before_marker. 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.
insert_before_marker 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.
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