z_function
Compute Z-function of a string with optional pattern matching.
This record as markdown: /tools/io-github-malamutemayhem-unclick-mcp-server/z-function.md
What z_function does on UnClick
AI agents call z_function to retrieve information from UnClick 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 |
|---|---|---|---|
text | string | Yes | Input string to compute Z-function for |
pattern | string | — | Optional pattern to search for in text |
Parameters from the server's own tool schema.
Why z_function is rated Low
The Z-function performs string analysis and pattern matching without modifying input data, executing external commands, creating side effects, or affecting system state. It retrieves computational results based on string input—characteristic of a Read operation. The severity is low as misuse would at worst consume computational resources or return irrelevant pattern data, with no destructive or financial impact.
From the tool's definition Tool name 'z_function' and description 'Compute Z-function of a string with optional pattern matching' indicate a purely computational algorithm applied to string data.
Attacks that exploit this kind of access
The rule that runs z_function safely
PolicyLayer is an MCP gateway: it sits between your AI agents and UnClick, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For z_function, this is the rule to start with:
z_function 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 UnClick, apply this rule, and every z_function call is checked against it from then on.
Questions about z_function
Compute Z-function of a string with optional pattern matching. It is categorised as a Read tool in the UnClick MCP Server, which means it retrieves data without modifying state.
z_function accepts 2 parameters: text, pattern. Required: text. The full parameter table on this page comes from the server's own tool schema.
Register the UnClick MCP server in PolicyLayer and add a rule for z_function: 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 UnClick. Nothing to install.
z_function 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 z_function 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 z_function. 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.
z_function is provided by the UnClick MCP server (@unclick/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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