Create an email draft without sending it. Supports threading headers for replies. IMPORTANT: each call creates a new draft — do not call twice for the same message.
AI agents use create_draft to create or update resources in Fastmail MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Fastmail MCP Server environment.
This tool creates draft emails, which is a write operation (reversible data creation). It does not send emails (Execute), delete anything (Destructive), move money (Financial), or read/query data (Read). The severity is medium because misuse could result in creating numerous unwanted drafts or drafts with sensitive/embarrassing content, but the damage is easily reversible through deletion.
From the tool's definition Tool description states 'Create an email draft without sending it' — a write operation that creates new data (draft emails) in the user's mailbox. The warning that 'each call creates a new draft' confirms the tool's side effect of creating reversible data.
Documented attack patterns abuse exactly the kind of access create_draft gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Fastmail MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for create_draft:
{
"version": "1",
"default": "deny",
"tools": {
"create_draft": {
"limits": [
{
"counter": "create_draft_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_draft 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 an email draft without sending it. Supports threading headers for replies. IMPORTANT: each call creates a new draft — do not call twice for the same message. It is categorised as a Write tool in the Fastmail MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Fastmail MCP Server MCP server in PolicyLayer and add a rule for create_draft: 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 Fastmail MCP Server. Nothing to install.
create_draft 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 create_draft 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 create_draft. 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.
create_draft is provided by the Fastmail MCP Server MCP server (madllama25/fastmail-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Fastmail MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
38 Fastmail MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.