This record as markdown: /tools/io-tinyfn-tinyfn/ends-with.md
What ends_with does on TinyFn
AI agents call ends_with 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 |
|---|---|---|---|
text | string | Yes | The text to check |
suffix | string | Yes | The suffix to look for |
Parameters from the server's own tool schema.
Why ends_with is rated Low
This is a purely query-based string validation function. It retrieves/checks information about text content without modifying data, executing commands, or triggering external operations. The read-only nature and deterministic behavior (part of a 500+ math/validation/encoding tool suite) confirm Read classification with minimal risk.
From the tool's definition Tool name 'ends_with' and description 'Check if text ends with a suffix' indicates a string inspection operation that performs a comparison without side effects.
Attacks that exploit this kind of access
The rule that runs ends_with 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 ends_with, this is the rule to start with:
ends_with 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 ends_with call is checked against it from then on.
Questions about ends_with
Check if text ends with a suffix. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
ends_with accepts 2 parameters: text, suffix. Required: text, suffix. 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 ends_with: 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.
ends_with 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 ends_with 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 ends_with. 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.
ends_with 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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