This record as markdown: /tools/io-tinyfn-tinyfn/cos.md
What cos does on TinyFn
AI agents call cos 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 |
|---|---|---|---|
angle | number | Yes | Angle in radians |
Parameters from the server's own tool schema.
Why cos is rated Low
This is a deterministic mathematical computation tool that takes an angle as input and returns its cosine value. It performs no data modification, system calls, external operations, or irreversible actions. It is a straightforward read-like operation that queries a mathematical function.
From the tool's definition Tool name 'cos' with description 'Calculate the cosine of an angle.' — a pure mathematical function that retrieves a computed value with no side effects.
Attacks that exploit this kind of access
The rule that runs cos 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 cos, this is the rule to start with:
cos 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 cos call is checked against it from then on.
Questions about cos
Calculate the cosine of an angle. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
cos accepts 1 parameter: angle. Required: angle. 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 cos: 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.
cos 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 cos 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 cos. 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.
cos 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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