insert_after_marker
Safely insert text after an exact marker in a text file.
This record as markdown: /tools/mapi-agent-memory/insert-after-marker.md
What insert_after_marker does on Mapi Agent Memory
AI agents use insert_after_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_after_marker is rated Medium
The tool modifies file contents by inserting text at a specified location. While the operation is reversible (text can be edited or deleted later), it alters stored data. Given the agent memory context and potential for inserting malicious content, unintended governance data, or critical system information into memory files, severity is high.
From the tool's definition Tool inserts text into a file. Description states 'insert text after an exact marker in a text file.' This is a file modification operation that creates or appends content, matching the Write category definition: 'creates or modifies data reversibly.'
Attacks that exploit this kind of access
The rule that runs insert_after_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_after_marker, this is the rule to start with:
insert_after_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_after_marker call is checked against it from then on.
Questions about insert_after_marker
Safely insert text after 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_after_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_after_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_after_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_after_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_after_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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