validate_pattern
Validate if a regex pattern is syntactically correct.
This record as markdown: /tools/io-tinyfn-tinyfn/validate-pattern.md
What validate_pattern does on TinyFn
AI agents call validate_pattern 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 |
|---|---|---|---|
pattern | string | Yes | Regular expression pattern to validate |
Parameters from the server's own tool schema.
Why validate_pattern is rated Low
This tool only checks the syntactic correctness of a regex pattern and returns a validation result. It performs no data retrieval beyond pattern analysis, makes no modifications to any data, executes no external code or shell commands, and causes no destructive or financial effects.
From the tool's definition Tool name 'validate_pattern' and description 'Validate if a regex pattern is syntactically correct' indicate a pure validation/checking operation with no side effects.
Attacks that exploit this kind of access
The rule that runs validate_pattern 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 validate_pattern, this is the rule to start with:
validate_pattern 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 validate_pattern call is checked against it from then on.
Questions about validate_pattern
Validate if a regex pattern is syntactically correct. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
validate_pattern accepts 1 parameter: pattern. Required: pattern. 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 validate_pattern: 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.
validate_pattern 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 validate_pattern 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 validate_pattern. 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.
validate_pattern 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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