hmac_md5

Generate HMAC-MD5.

SERVERTinyFn SOURCEhttps://api.tinyfn.io/mcp/all/

Low RISK CLASS

Category Read

Parameters 22 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-tinyfn-tinyfn/hmac-md5.md

WHAT IT DOES

What hmac_md5 does on TinyFn

AI agents call hmac_md5 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
`key`	string	Yes	Secret key
`message`	string	Yes	Message to authenticate

Parameters from the server's own tool schema.

RISK

Why hmac_md5 is rated Low

HMAC-MD5 is a deterministic hashing function used for data validation, integrity checking, and authentication. It produces output based on input parameters but does not read sensitive data, modify state, execute arbitrary code, delete data, or move money. The tool is part of a suite of deterministic utility functions for AI agents (math, conversion, validation, hashing, encoding).

From the tool's definition Tool name 'hmac_md5' and description 'Generate HMAC-MD5' indicate a cryptographic hash generation function that computes a fixed output from inputs without side effects or state modification.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs hmac_md5 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 hmac_md5, this is the rule to start with:

hmac_md5 Allowed

hmac_md5 is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "hmac_md5": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect TinyFn, apply this rule, and every hmac_md5 call is checked against it from then on.

FAQ

Questions about hmac_md5

What does the hmac_md5 tool do? +

Generate HMAC-MD5. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.

What parameters does hmac_md5 accept? +

hmac_md5 accepts 2 parameters: key, message. Required: key, message. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on hmac_md5? +

Register the TinyFn MCP server in PolicyLayer and add a rule for hmac_md5: 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.

What risk level is hmac_md5? +

hmac_md5 is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit hmac_md5? +

Yes. Add a rate_limit block to the hmac_md5 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.

How do I block hmac_md5 completely? +

Set action: deny in the PolicyLayer policy for hmac_md5. 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.

What MCP server provides hmac_md5? +

hmac_md5 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.

KEEP EXPLORING

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