This record as markdown: /tools/io-tinyfn-tinyfn/days-in-month.md
What days_in_month does on TinyFn
AI agents call days_in_month to retrieve information from TinyFn without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
year | integer | Yes | Year |
month | integer | Yes | Month (1-12) |
Parameters from the server's own tool schema.
Why days_in_month is rated Low
This is a simple deterministic utility that returns calendar metadata. It does not create, modify, delete, or execute anything. It is a straightforward read operation that returns static information based on input parameters (month/year).
From the tool's definition Tool name is 'days_in_month' and description states 'Get the number of days in a month.' The verb 'Get' and 'number of days' indicate a pure query operation that retrieves calendar information with no side effects, modifications, or execution of code.
Attacks that exploit this kind of access
The rule that runs days_in_month safely
PolicyLayer is an MCP gateway: it sits between your AI agents and TinyFn, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For days_in_month, this is the rule to start with:
days_in_month is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect TinyFn, apply this rule, and every days_in_month call is checked against it from then on.
Questions about days_in_month
Get the number of days in a month. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
days_in_month accepts 2 parameters: year, month. Required: year, month. The full parameter table on this page comes from the server's own tool schema.
Register the TinyFn MCP server in PolicyLayer and add a rule for days_in_month: 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 TinyFn. Nothing to install.
days_in_month is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the days_in_month 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 days_in_month. 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.
days_in_month is provided by the TinyFn MCP server (https://api.tinyfn.io/mcp/all/). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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