add_to_dictionary · SpellChecker MCP Server MCP

WHAT IT DOES

What add_to_dictionary does on SpellChecker MCP Server

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

WHY IT NEEDS A POLICY

Why add_to_dictionary needs a policy

This tool creates or modifies a personal dictionary by adding words. This is a reversible write operation (words can be removed later) with minimal blast radius—incorrect dictionary entries only affect spell-checking results, not critical data or system state. It does not read external data, execute code, delete irreversibly, or involve financial operations.

From the tool's definition Tool name 'add_to_dictionary' and description 'Add a word to the personal dictionary' clearly indicate creation/modification of dictionary data.

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 SpellChecker MCP Server, so you can run agents against it safely.

FAQ

Questions about add_to_dictionary

What does the add_to_dictionary tool do? +

Add a word to the personal dictionary. It is categorised as a Write tool in the SpellChecker 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 SpellChecker 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 SpellChecker 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 SpellChecker MCP Server MCP server (morahan/spellchecker-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.