AI agents call filename_safe 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 |
|---|---|---|---|
filename | string | Yes | Filename to sanitize |
max_length | integer | — | Maximum filename length |
replacement | string | — | Character to replace invalid chars with |
Parameters from the server's own tool schema.
This tool performs a deterministic string transformation (sanitizing a string into a safe filename). It reads input and returns a transformed output with no side effects, no data written, no execution, and no financial implications.
From the tool's definition Convert a string to a safe filename
Risk signalsAccepts file system path (filename)
Attacks that exploit this kind of access
Convert a string to a safe filename. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
filename_safe accepts 3 parameters: filename, max_length, replacement. Required: filename. 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 filename_safe: 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.
filename_safe 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 filename_safe 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 filename_safe. 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.
filename_safe 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.
filename_safe 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.
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