Upload an activity file (FIT, TCX, or GPX format) to create a new activity. The file content must be base64-encoded. Returns an upload ID to check processing status with strava_get_upload.
AI agents use strava_create_upload to create or update resources in Strava MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Strava MCP Server environment.
This tool creates and persists new data (fitness activities) in the user's Strava account. It is reversible—activities can be deleted—so it is Write rather than Destructive.
From the tool's definition Tool creates a new activity via file upload, modifying user's fitness activity data. Description explicitly states 'create a new activity' and accepts file uploads in standard formats (FIT, TCX, GPX).
Attacks that exploit this kind of access
Upload an activity file (FIT, TCX, or GPX format) to create a new activity. The file content must be base64-encoded. Returns an upload ID to check processing status with strava_get_upload. It is categorised as a Write tool in the Strava MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Strava MCP Server MCP server in PolicyLayer and add a rule for strava_create_upload: 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 MCP Server. Nothing to install.
strava_create_upload 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 strava_create_upload 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 strava_create_upload. 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.
strava_create_upload is provided by the Strava MCP Server MCP server (justmytwospence/strava-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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