AI agents use set_hydration to create or update resources in Garmin Connect — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Garmin Connect environment.
This tool creates or modifies health data (hydration intake) in the Garmin Connect system. It is reversible—users can update the value again—so it is Write rather than Destructive.
From the tool's definition Tool name 'set_hydration' and description 'Set daily hydration intake in milliliters' indicate a data modification operation. The verb 'set' and the action of storing/updating a health metric demonstrate write capability.
Documented attack patterns abuse exactly the kind of access set_hydration gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Garmin Connect, and nothing reaches the server without passing your rules. This is the rule we recommend for set_hydration:
{
"version": "1",
"default": "deny",
"tools": {
"set_hydration": {
"limits": [
{
"counter": "set_hydration_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}set_hydration 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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Set daily hydration intake in milliliters. It is categorised as a Write tool in the Garmin Connect MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Garmin Connect MCP server in PolicyLayer and add a rule for set_hydration: 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 Garmin Connect. Nothing to install.
set_hydration 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 set_hydration 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 set_hydration. 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.
set_hydration is provided by the Garmin Connect MCP server (nicolasvegam/garmin-connect-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 97 Garmin Connect tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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97 Garmin Connect tools catalogued and risk-classified — across an index of 42,500+ MCP servers.