This record as markdown: /tools/io-github-kivanccakmak-yaver/base64.md
What base64 does on Yaver
AI agents call base64 to retrieve information from Yaver 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 |
|---|---|---|---|
input | string | Yes | Text to encode/decode |
action | string | Yes | encode or decode |
Parameters from the server's own tool schema.
Why base64 is rated Low
Base64 encode/decode is a stateless cryptographic utility that reads input and returns transformed output without modifying any underlying data, executing code, or triggering external effects. It falls cleanly under Read category despite being a transformation function, as it has no persistence or operational side effects.
From the tool's definition Tool performs base64 encoding or decoding of text - a reversible transformation with no side effects, data creation, destruction, or external operations.
Attacks that exploit this kind of access
The rule that runs base64 safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Yaver, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For base64, this is the rule to start with:
base64 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 Yaver, apply this rule, and every base64 call is checked against it from then on.
Questions about base64
Base64 encode or decode text. It is categorised as a Read tool in the Yaver MCP Server, which means it retrieves data without modifying state.
base64 accepts 2 parameters: input, action. Required: input, action. The full parameter table on this page comes from the server's own tool schema.
Register the Yaver MCP server in PolicyLayer and add a rule for base64: 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 Yaver. Nothing to install.
base64 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 base64 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 base64. 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.
base64 is provided by the Yaver MCP server (yaver-cli). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
More on Yaver, and thousands of servers like it.
This server
Across the catalogue