longest_common_prefix
Find the longest common prefix among an array of strings.
This record as markdown: /tools/io-github-malamutemayhem-unclick-mcp-server/longest-common-prefix.md
What longest_common_prefix does on UnClick
AI agents call longest_common_prefix 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 |
|---|---|---|---|
strings | array | Yes | Array of strings (max 10,000) |
Parameters from the server's own tool schema.
Why longest_common_prefix is rated Low
This tool implements a standard string processing algorithm that takes an array of strings as input and returns the longest common prefix. It is a stateless, deterministic function with no capability to read external data, modify systems, execute commands, or perform financial transactions.
From the tool's definition Tool name and description indicate a pure string algorithm operation: 'Find the longest common prefix among an array of strings.' This is a computational function that processes input data without retrieving external data, modifying state, executing arbitrary…
Attacks that exploit this kind of access
The rule that runs longest_common_prefix 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 longest_common_prefix, this is the rule to start with:
longest_common_prefix 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 longest_common_prefix call is checked against it from then on.
Questions about longest_common_prefix
Find the longest common prefix among an array of strings. It is categorised as a Read tool in the UnClick MCP Server, which means it retrieves data without modifying state.
longest_common_prefix accepts 1 parameter: strings. Required: strings. 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 longest_common_prefix: 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.
longest_common_prefix 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 longest_common_prefix 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 longest_common_prefix. 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.
longest_common_prefix 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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