AI agents use update_client to create or update resources in Clockify MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Clockify MCP Server environment.
This tool modifies client records in a reversible manner. While it changes data, it does not delete or permanently destroy information, nor does it execute arbitrary code or handle financial transactions. Update operations are categorized as Write.
From the tool's definition Tool name 'update_client' and description 'Update an existing client' clearly indicate modification of existing data (not deletion, not irreversible destruction).
Documented attack patterns abuse exactly the kind of access update_client gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Clockify MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for update_client:
{
"version": "1",
"default": "deny",
"tools": {
"update_client": {
"limits": [
{
"counter": "update_client_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update_client 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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Update an existing client. It is categorised as a Write tool in the Clockify MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Clockify MCP Server MCP server in PolicyLayer and add a rule for update_client: 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 Clockify MCP Server. Nothing to install.
update_client 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 update_client 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 update_client. 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.
update_client is provided by the Clockify MCP Server MCP server (ratheesh-aot/clockify-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Clockify MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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29 Clockify MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.