add_to_dictionary · Simple Voice MCP Server MCP

WHAT IT DOES

What add_to_dictionary does on Simple Voice MCP Server

AI agents use add_to_dictionary to create or update resources in Simple Voice MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Simple Voice MCP Server environment.

WHY IT NEEDS A POLICY

Why add_to_dictionary needs a policy

This tool creates or modifies dictionary entries in a custom pronunciation database. While it modifies persistent state, these changes are reversible (as evidenced by the remove_from_dictionary tool), making this a Write operation rather than Destructive. The blast radius is minimal—misconfigured pronunciations only affect TTS output quality and do not impact system integrity, financial assets, or external services.

From the tool's definition The tool description states it registers (登録します) new word-pronunciation pairs in a custom dictionary, supporting multiple entries separated by commas. The sibling tool 'remove_from_dictionary' confirms this is a reversible modification system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_to_dictionary Rate-limited

add_to_dictionary stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "add_to_dictionary": {
      "limits": [
        {
          "counter": "add_to_dictionary_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Simple Voice MCP Server, so you can run agents against it safely.

FAQ

Questions about add_to_dictionary

What does the add_to_dictionary tool do? +

カスタム辞書に新しい英単語とカタカナ読みのペアを登録します。HDMIやAPIなどの略語や、.pyのような拡張子も登録できます。複数登録する場合はカンマ区切りで指定できます。. It is categorised as a Write tool in the Simple Voice MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_to_dictionary? +

Register the Simple Voice MCP Server MCP server in PolicyLayer and add a rule for add_to_dictionary: 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 Simple Voice MCP Server. Nothing to install.

What risk level is add_to_dictionary? +

add_to_dictionary is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit add_to_dictionary? +

Yes. Add a rate_limit block to the add_to_dictionary 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 add_to_dictionary completely? +

Set action: deny in the PolicyLayer policy for add_to_dictionary. 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 add_to_dictionary? +

add_to_dictionary is provided by the Simple Voice MCP Server MCP server (kurasuai-inc/voice-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.