AI agents call hash_sha256 to retrieve information from TinyFn without modifying anything — 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.
SHA-256 hashing is a cryptographic read operation that transforms input into a hash value. It does not create, modify, delete, or execute arbitrary code. It has no side effects and cannot be misused to cause harm through the tool itself—the output is simply a deterministic hash. This is a pure computational utility with minimal risk if misused by an AI agent.
From the tool's definition Tool name is 'hash_sha256' and description states 'Generate SHA-256 hash of text.' Hashing is a one-way deterministic computation that reads input and produces output without modifying data, triggering external systems, or having side effects.
Attacks that exploit this kind of access
Generate SHA-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_sha256 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_sha256: 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_sha256 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_sha256 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_sha256. 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_sha256 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.
hash_sha256 is one line of TinyFn's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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