add_style_decision

THE RISK

Medium Risk

Why add_style_decision needs a policy

This tool creates or modifies style decision records in the manuscript project—a reversible write operation. It does not execute code, delete data irreversibly, or move money. The blast radius of misuse is minimal: an AI agent could add nonsensical or contradictory style decisions, but these can be reviewed and corrected. No destructive or execute-level risk is present.

From the tool's definition Tool name 'add_style_decision' and description 'Record a style decision for consistency' indicate a create/modify operation that stores stylistic guidance. 'Record' and 'add' are write operations that create new data artifacts reversibly.

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

POLICY

How to control add_style_decision

PolicyLayer is an MCP gateway — it sits between your AI agents and Claude Writer's Aid MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for add_style_decision:

policy.json

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

add_style_decision 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.

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

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about add_style_decision

What does the add_style_decision tool do? +

Record a style decision for consistency. It is categorised as a Write tool in the Claude Writer's Aid MCP 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_style_decision? +

Register the Claude Writer's Aid MCP server in PolicyLayer and add a rule for add_style_decision: 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 Claude Writer's Aid MCP. Nothing to install.

What risk level is add_style_decision? +

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

Can I rate-limit add_style_decision? +

Yes. Add a rate_limit block to the add_style_decision 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_style_decision completely? +

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

add_style_decision is provided by the Claude Writer's Aid MCP server (xiaolai/claude-writers-aid-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Claude Writer's Aid MCP tool call.

Start from Claude Writer's Aid MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →