Create a new activity on Strava
AI agents use createActivity to create or update resources in Strava — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Strava environment.
This tool creates new data (an activity record) in Strava, which is a Write operation. While creation is reversible via deletion by the user, the tool itself performs a create operation, not a destructive one. Severity is medium because misuse could clutter a user's activity history but carries no financial risk and the impact is limited to one user's account data.
From the tool's definition Tool name 'createActivity' and description 'Create a new activity on Strava' indicate irreversible creation of data in a user's fitness tracking account.
Documented attack patterns abuse exactly the kind of access createActivity gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Strava, and nothing reaches the server without passing your rules. This is the rule we recommend for createActivity:
{
"version": "1",
"default": "deny",
"tools": {
"createActivity": {
"limits": [
{
"counter": "createactivity_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}createActivity 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.
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Create a new activity on Strava. It is categorised as a Write tool in the Strava MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Strava MCP server in PolicyLayer and add a rule for createActivity: 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 Strava. Nothing to install.
createActivity 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 createActivity 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 createActivity. 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.
createActivity is provided by the Strava MCP server (kw510/strava-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Strava, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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37 Strava tools catalogued and risk-classified — across an index of 43,000+ MCP servers.