This record as markdown: /tools/io-tinyfn-tinyfn/hash-sha3-256.md
What hash_sha3_256 does on TinyFn
AI agents call hash_sha3_256 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 | Text to hash |
Parameters from the server's own tool schema.
Why hash_sha3_256 is rated Low
This is a pure cryptographic utility that reads/transforms input into a hash output. It performs no writes, deletions, code execution, or financial operations. The tool is deterministic and safe—misuse by an AI agent would only produce unwanted hash values, not cause damage. Classified as Read (retrieves/computes data with no side effects).
From the tool's definition Tool generates a hash (SHA3-256) of input text. Hashing is a deterministic, one-way cryptographic operation that produces output without modifying, creating, deleting, or executing anything.
Attacks that exploit this kind of access
The rule that runs hash_sha3_256 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 hash_sha3_256, this is the rule to start with:
hash_sha3_256 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 hash_sha3_256 call is checked against it from then on.
Questions about hash_sha3_256
Generate SHA3-256 hash of text. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
hash_sha3_256 accepts 1 parameter: text. Required: text. 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 hash_sha3_256: 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.
hash_sha3_256 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 hash_sha3_256 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 hash_sha3_256. 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.
hash_sha3_256 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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