AI agents call is_valid_slug to retrieve information from TinyFn without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
slug | string | Yes | Slug to validate |
Parameters from the server's own tool schema.
This is a pure validation function that reads input and returns a boolean result. It has no side effects, does not modify or delete data, does not execute code or external operations, and does not involve financial transactions. It is a deterministic utility for checking whether a string conforms to URL slug format conventions, consistent with the server's stated purpose of offering validation tools.
From the tool's definition Tool name 'is_valid_slug' and description 'Check if a string is a valid URL slug' indicate a validation/checking operation with no data modification, deletion, or execution of external commands.
Attacks that exploit this kind of access
Check if a string is a valid URL slug. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
is_valid_slug accepts 1 parameter: slug. Required: slug. 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 is_valid_slug: 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.
is_valid_slug 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 is_valid_slug 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 is_valid_slug. 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.
is_valid_slug 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.
is_valid_slug is one line of TinyFn's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
Teams ship this data inside their own products. See what a licence covers →