Send a TalkToPlanB message. Provide text plus EITHER roomId (an existing room from list_rooms) OR toPhone (the recipient’s phone number, which finds or creates a direct message).
AI agents use send_message to create or update resources in Talktoplanb — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Talktoplanb environment.
This tool creates new messages and potentially initiates new direct message conversations, which are reversible write operations. It does not execute arbitrary code, delete data irreversibly, or move financial resources.
From the tool's definition Tool description states 'Send a TalkToPlanB message' and accepts parameters to create or route messages to either existing rooms or new direct messages via phone number.
Attacks that exploit this kind of access
Send a TalkToPlanB message. Provide text plus EITHER roomId (an existing room from list_rooms) OR toPhone (the recipient’s phone number, which finds or creates a direct message). It is categorised as a Write tool in the Talktoplanb MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Talktoplanb MCP server in PolicyLayer and add a rule for send_message: 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 Talktoplanb. Nothing to install.
send_message 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 send_message 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 send_message. 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.
send_message is provided by the Talktoplanb MCP server (talktoplanb-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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