This record as markdown: /tools/io-tinyfn-tinyfn/hash-blake2s.md
What hash_blake2s does on TinyFn
AI agents call hash_blake2s 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 |
digest_size | integer | — | Digest size in bytes |
Parameters from the server's own tool schema.
Why hash_blake2s is rated Low
Hashing is a read-only operation that computes a digest from input data. It does not create, modify, delete, or execute anything—it merely transforms input into a hash value. The tool is part of a collection of '500+ deterministic tools' designed for data processing without side effects. BLAKE2s is a pure cryptographic hash function with no mutable operations.
From the tool's definition Tool name 'hash_blake2s' and description 'Generate BLAKE2s hash of text' indicate a deterministic cryptographic hashing function that produces output from input without side effects, state changes, or data modification.
Attacks that exploit this kind of access
The rule that runs hash_blake2s 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_blake2s, this is the rule to start with:
hash_blake2s 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_blake2s call is checked against it from then on.
Questions about hash_blake2s
Generate BLAKE2s hash of text. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
hash_blake2s accepts 2 parameters: text, digest_size. 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_blake2s: 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_blake2s 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_blake2s 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_blake2s. 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_blake2s 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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