Add a message (note/comment) to an activity on Intervals.icu Args: activity_id: The Intervals.icu activity ID content: The message text to add api_key: The Intervals.icu API key (optional, will use API_KEY from .env if not provided)
AI agents use add_activity_message to create or update resources in Intervals Icu MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Intervals Icu MCP Server environment.
This tool creates new data (a message/comment) attached to an existing activity record. It is reversible (comments can be edited or deleted separately) and has no destructive, financial, or code execution properties. It fits the Write category: creates or modifies data reversibly.
From the tool's definition Tool description states 'Add a message (note/comment) to an activity', which creates new data (a comment/note) without destructive or financial consequences. The tool modifies fitness tracking metadata reversibly.
Documented attack patterns abuse exactly the kind of access add_activity_message gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Intervals Icu MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for add_activity_message:
{
"version": "1",
"default": "deny",
"tools": {
"add_activity_message": {
"limits": [
{
"counter": "add_activity_message_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}add_activity_message 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.
Free to start. No card required.
Add a message (note/comment) to an activity on Intervals.icu Args: activity_id: The Intervals.icu activity ID content: The message text to add api_key: The Intervals.icu API key (optional, will use API_KEY from .env if not provided). It is categorised as a Write tool in the Intervals Icu MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Intervals Icu MCP Server MCP server in PolicyLayer and add a rule for add_activity_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 Intervals Icu MCP Server. Nothing to install.
add_activity_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 add_activity_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 add_activity_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.
add_activity_message is provided by the Intervals Icu MCP Server MCP server (mvilanova/intervals-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Intervals Icu MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
21 Intervals Icu MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.