This record as markdown: /tools/io-tinyfn-tinyfn/hash-crc32.md
What hash_crc32 does on TinyFn
AI agents call hash_crc32 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 calculate CRC32 |
Parameters from the server's own tool schema.
Why hash_crc32 is rated Low
CRC32 is a deterministic hashing function that takes input and produces a checksum output. This is a read-only operation with no side effects, no data modification, no code execution, and no financial impact. It fits squarely in the Read category as a data retrieval/calculation utility. Low severity because even if misused by an agent, generating checksums poses minimal security risk.
From the tool's definition Tool name 'hash_crc32' and description 'Calculate CRC32 checksum' indicate a pure computation that retrieves/calculates a value from input data without modifying state, creating side effects, or executing external code.
Attacks that exploit this kind of access
The rule that runs hash_crc32 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_crc32, this is the rule to start with:
hash_crc32 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_crc32 call is checked against it from then on.
Questions about hash_crc32
Calculate CRC32 checksum. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
hash_crc32 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_crc32: 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_crc32 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_crc32 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_crc32. 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_crc32 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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