Get details of a Phabricator differential revision.
AI agents call get_differential to retrieve information from Phabricator MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves information about a differential revision without creating, modifying, or deleting any data. It is a straightforward read operation analogous to a GET request in REST APIs. Even if an AI agent misuses it by querying unintended revisions, the only effect is information disclosure, which poses minimal risk.
From the tool's definition Tool name 'get_differential' and description 'Get details of a Phabricator differential revision' indicate a retrieval operation with no side effects. The verb 'get' and 'details' confirm read-only data querying.
Documented attack patterns abuse exactly the kind of access get_differential gives an agent:
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 get_differential:
{
"version": "1",
"default": "deny",
"tools": {
"get_differential": {}
}
}get_differential is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get details of a Phabricator differential revision. It is categorised as a Read tool in the Phabricator MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Phabricator MCP Server MCP server in PolicyLayer and add a rule for get_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.
get_differential is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_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.
Set action: deny in the PolicyLayer policy for get_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.
get_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.
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.
Free to start. No card required.
11 Phabricator MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.