This record as markdown: /tools/io-tinyfn-tinyfn/hash-blake2b.md
What hash_blake2b does on TinyFn
AI agents call hash_blake2b 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_blake2b is rated Low
BLAKE2b hashing is a pure, idempotent read-like operation: it computes and returns a cryptographic hash of the input without creating, modifying, deleting, or executing external operations. While hashing is cryptographic, it poses minimal risk when misused by an AI agent—the worst case is computing unnecessary hashes, which has no destructive or financial impact. Classified as Read with low severity.
From the tool's definition Tool description states 'Generate BLAKE2b hash of text' — a deterministic cryptographic hashing operation that produces a fixed-size digest from input data with no side effects, modifications, or external state changes.
Attacks that exploit this kind of access
The rule that runs hash_blake2b 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_blake2b, this is the rule to start with:
hash_blake2b 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_blake2b call is checked against it from then on.
Questions about hash_blake2b
Generate BLAKE2b hash of text. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
hash_blake2b 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_blake2b: 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_blake2b 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_blake2b 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_blake2b. 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_blake2b 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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