conv_strip_message_signature
Replace an inbound message
This record as markdown: /tools/com-getmunin-munin/conv-strip-message-signature.md
What conv_strip_message_signature does on Munin
AI agents use conv_strip_message_signature to create or update resources in Munin, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Munin environment.
Why conv_strip_message_signature is rated Medium
This tool modifies message content by removing/replacing signatures in inbound messages. It is a reversible Write operation (data can be restored or re-modified) rather than a destructive deletion. Severity is medium because it modifies communication records that users may rely on for context, and an AI agent could maliciously alter message content to obscure sender identity or create misleading conversation records.
From the tool's definition Tool name indicates 'strip_message_signature' and description states 'Replace an inbound message', which describes modification of existing message data.
Attacks that exploit this kind of access
The rule that runs conv_strip_message_signature safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Munin, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For conv_strip_message_signature, this is the rule to start with:
conv_strip_message_signature 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 Munin, apply this rule, and every conv_strip_message_signature call is checked against it from then on.
Questions about conv_strip_message_signature
Replace an inbound message. It is categorised as a Write tool in the Munin MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Munin MCP server in PolicyLayer and add a rule for conv_strip_message_signature: 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 Munin. Nothing to install.
conv_strip_message_signature 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 conv_strip_message_signature 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 conv_strip_message_signature. 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.
conv_strip_message_signature is provided by the Munin MCP server (https://mcp.getmunin.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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