This record as markdown: /tools/io-tinyfn-tinyfn/week-number.md
What week_number does on TinyFn
AI agents call week_number 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 |
|---|---|---|---|
date | string | Yes | Date (YYYY-MM-DD) |
Parameters from the server's own tool schema.
Why week_number is rated Low
This tool retrieves calculated metadata (ISO week number) from a provided date input. It performs no data modification, deletion, execution of code, or financial operations. It is a pure read/query operation with no side effects, fitting squarely in the Read category with low severity since misuse would only result in incorrect date calculations without any risk to systems or data.
From the tool's definition Tool name 'week_number' and description 'Get the ISO week number of a date' indicate a query operation that retrieves information without modification or side effects.
Attacks that exploit this kind of access
The rule that runs week_number 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 week_number, this is the rule to start with:
week_number 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 week_number call is checked against it from then on.
Questions about week_number
Get the ISO week number of a date. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
week_number accepts 1 parameter: date. Required: date. 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 week_number: 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.
week_number 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 week_number 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 week_number. 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.
week_number 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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