dictionary_clear

THE RISK

Critical Risk

Why dictionary_clear needs a policy

This tool permanently removes all dictionary entries without reverting or rollback capability. While the blast radius is limited to pronunciation dictionaries (not critical system data), the irreversible nature and loss of all user-configured entries makes it Destructive rather than Write.

From the tool's definition Tool name is 'dictionary_clear' with description 'Clear all dictionary entries' — this irreversibly deletes all stored pronunciation dictionary data with no undo mechanism.

Risk signalsBulk/mass operation — affects multiple targets

Documented attack patterns abuse exactly the kind of access dictionary_clear gives an agent:

POLICY

How to control dictionary_clear

PolicyLayer is an MCP gateway — it sits between your AI agents and VOICEPEAK MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for dictionary_clear:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "dictionary_clear"
  ]
}

dictionary_clear disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

Create a free account and register VOICEPEAK MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RESTRICT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More VOICEPEAK MCP Server tools

Destructive dictionary_remove Remove a dictionary entry Execute play Play a synthesized audio file Execute synthesize_and_play Synthesize speech from text and immediately play it (max 140 characters per synthesis) Write synthesize Synthesize speech from text using VOICEPEAK (max 140 characters per synthesis) Write dictionary_add Add or update a dictionary entry for custom pronunciation Read dictionary_find Find dictionary entries by surface form Read dictionary_list List all dictionary entries Read list_emotions List available emotions for a narrator

All 10 VOICEPEAK MCP Server tools →

Destructive tools on other servers

Android Forensics ADB MCP Server create_full_backup 0xarchive web3_revoke_key Frida Game Hacking MCP clear_scan cPanel MCP Server clear_spam_box

Go deeper

Critical-risk tools in VOICEPEAK MCP Server → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about dictionary_clear

What does the dictionary_clear tool do? +

Clear all dictionary entries. It is categorised as a Destructive tool in the VOICEPEAK MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on dictionary_clear? +

Register the VOICEPEAK MCP Server MCP server in PolicyLayer and add a rule for dictionary_clear: 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 VOICEPEAK MCP Server. Nothing to install.

What risk level is dictionary_clear? +

dictionary_clear is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit dictionary_clear? +

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

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

dictionary_clear is provided by the VOICEPEAK MCP Server MCP server (k2wanko/voicepeak-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every VOICEPEAK MCP Server tool call.

Start from VOICEPEAK MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →