Insert a message bypassing spam scanning
Risk signalsBypasses security scanning on insert
Part of the Google Workspace Gmail (gws CLI) server.
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AI agents use gmail_users_messages_insert to create or modify resources in Google Workspace Gmail (gws CLI). Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call gmail_users_messages_insert repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Google Workspace Gmail (gws CLI).
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"gmail_users_messages_insert": {
"limits": [
{
"counter": "gmail_users_messages_insert_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Google Workspace Gmail (gws CLI) policy for all 79 tools.
These attack patterns abuse exactly the kind of access gmail_users_messages_insert gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Insert a message bypassing spam scanning. It is categorised as a Write tool in the Google Workspace Gmail (gws CLI) MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Google Workspace Gmail (gws CLI) MCP server in PolicyLayer and add a rule for gmail_users_messages_insert: 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 Google Workspace Gmail (gws CLI). Nothing to install.
gmail_users_messages_insert 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 gmail_users_messages_insert 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 gmail_users_messages_insert. 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.
gmail_users_messages_insert is provided by the Google Workspace Gmail (gws CLI) MCP server (@gws mcp -s gmail). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 79 Google Workspace Gmail (gws CLI) tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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