request_changes_differential

THE RISK

Medium Risk

Why request_changes_differential needs a policy

Based on the tool name and server context (Phabricator code review), this tool likely submits a 'request changes' review action on a differential revision, which is a reversible write operation. Sibling tools like 'accept_differential' and 'add_differential_comment' confirm this pattern. The description is empty, lowering confidence.

From the tool's definition Tool name 'request_changes_differential' suggests requesting changes on a differential revision; description is empty and uninformative

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

POLICY

How to control request_changes_differential

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

policy.json

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

request_changes_differential 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 Phabricator 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.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Phabricator MCP Server tools

Write accept_differential Accept a differential revision. Write subscribe_to_differential subscribe_to_differential Write subscribe_to_task subscribe_to_task Write add_differential_comment add_differential_comment Write add_inline_comment add_inline_comment Write add_task_comment Add a comment to a Phabricator task. Read get_differential Get details of a Phabricator differential revision. Read get_differential_detailed get_differential_detailed

All 11 Phabricator MCP Server tools →

Write tools on other servers

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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 request_changes_differential

What does the request_changes_differential tool do? +

request_changes_differential. It is categorised as a Write tool in the Phabricator 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 request_changes_differential? +

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

What risk level is request_changes_differential? +

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

Can I rate-limit request_changes_differential? +

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

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

request_changes_differential is provided by the Phabricator MCP Server MCP server (yushengauggie/phabricator-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Phabricator MCP Server tool call.

Start from Phabricator 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 →