count_char
Count occurrences of a character (e.g., how many 'r' in 'strawberry').
This record as markdown: /tools/io-tinyfn-tinyfn/count-char.md
What count_char does on TinyFn
AI agents call count_char 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 |
|---|---|---|---|
char | string | Yes | Character to count |
text | string | Yes | The text to search in |
case_sensitive | boolean | — | Case sensitive counting |
Parameters from the server's own tool schema.
Why count_char is rated Low
This is a pure data query operation that retrieves information from input without creating, modifying, deleting, or executing anything. It is deterministic and causes no side effects, making it a Read category tool with minimal risk.
From the tool's definition Tool counts occurrences of a character in a string with no side effects. Description states 'count occurrences' and examples show simple query operations (e.g., 'how many r in strawberry'). No modification, deletion, or execution capability.
Attacks that exploit this kind of access
The rule that runs count_char 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 count_char, this is the rule to start with:
count_char 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 count_char call is checked against it from then on.
Questions about count_char
Count occurrences of a character (e.g., how many 'r' in 'strawberry'). It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
count_char accepts 3 parameters: char, text, case_sensitive. Required: char, 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 count_char: 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.
count_char 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 count_char 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 count_char. 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.
count_char 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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